From cf4674c46c66e45f238f8f7e81af2a444b970c0a Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Sat, 19 Aug 2017 15:26:01 -0500 Subject: signal/powerpc: Document conflicts with SI_USER and SIGFPE and SIGTRAP Setting si_code to 0 results in a userspace seeing an si_code of 0. This is the same si_code as SI_USER. Posix and common sense requires that SI_USER not be a signal specific si_code. As such this use of 0 for the si_code is a pretty horribly broken ABI. Further use of si_code == 0 guaranteed that copy_siginfo_to_user saw a value of __SI_KILL and now sees a value of SIL_KILL with the result that uid and pid fields are copied and which might copying the si_addr field by accident but certainly not by design. Making this a very flakey implementation. Utilizing FPE_FIXME and TRAP_FIXME, siginfo_layout() will now return SIL_FAULT and the appropriate fields will be reliably copied. Possible ABI fixes includee: - Send the signal without siginfo - Don't generate a signal - Possibly assign and use an appropriate si_code - Don't handle cases which can't happen Cc: Paul Mackerras Cc: Kumar Gala Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: linuxppc-dev@lists.ozlabs.org Ref: 9bad068c24d7 ("[PATCH] ppc32: support for e500 and 85xx") Ref: 0ed70f6105ef ("PPC32: Provide proper siginfo information on various exceptions.") History Tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git Signed-off-by: "Eric W. Biederman" --- arch/powerpc/include/uapi/asm/siginfo.h | 15 +++++++++++++++ arch/powerpc/kernel/traps.c | 10 +++++----- 2 files changed, 20 insertions(+), 5 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/uapi/asm/siginfo.h b/arch/powerpc/include/uapi/asm/siginfo.h index 1a691141e49f..444ca6c9989a 100644 --- a/arch/powerpc/include/uapi/asm/siginfo.h +++ b/arch/powerpc/include/uapi/asm/siginfo.h @@ -18,4 +18,19 @@ #undef NSIGTRAP #define NSIGTRAP 4 +/* + * SIGFPE si_codes + */ +#ifdef __KERNEL__ +#define FPE_FIXME 0 /* Broken dup of SI_USER */ +#endif /* __KERNEL__ */ + +/* + * SIGTRAP si_codes + */ +#ifdef __KERNEL__ +#define TRAP_FIXME 0 /* Broken dup of SI_USER */ +#endif /* __KERNEL__ */ + + #endif /* _ASM_POWERPC_SIGINFO_H */ diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index f3eb61be0d30..f2e6e1838952 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -917,7 +917,7 @@ void unknown_exception(struct pt_regs *regs) printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", regs->nip, regs->msr, regs->trap); - _exception(SIGTRAP, regs, 0, 0); + _exception(SIGTRAP, regs, TRAP_FIXME, 0); exception_exit(prev_state); } @@ -939,7 +939,7 @@ bail: void RunModeException(struct pt_regs *regs) { - _exception(SIGTRAP, regs, 0, 0); + _exception(SIGTRAP, regs, TRAP_FIXME, 0); } void single_step_exception(struct pt_regs *regs) @@ -978,7 +978,7 @@ static void emulate_single_step(struct pt_regs *regs) static inline int __parse_fpscr(unsigned long fpscr) { - int ret = 0; + int ret = FPE_FIXME; /* Invalid operation */ if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX)) @@ -1929,7 +1929,7 @@ void SPEFloatingPointException(struct pt_regs *regs) extern int do_spe_mathemu(struct pt_regs *regs); unsigned long spefscr; int fpexc_mode; - int code = 0; + int code = FPE_FIXME; int err; flush_spe_to_thread(current); @@ -1998,7 +1998,7 @@ void SPEFloatingPointRoundException(struct pt_regs *regs) printk(KERN_ERR "unrecognized spe instruction " "in %s at %lx\n", current->comm, regs->nip); } else { - _exception(SIGFPE, regs, 0, regs->nip); + _exception(SIGFPE, regs, FPE_FIXME, regs->nip); return; } } -- cgit v1.2.3 From 2f82a46f66c8754dfe690d469899d12819b19c58 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Wed, 19 Jul 2017 22:18:51 -0500 Subject: signal: Remove _sys_private and _overrun_incr from struct compat_siginfo We have never passed either field to or from userspace so just remove them. Signed-off-by: "Eric W. Biederman" --- arch/arm64/include/asm/compat.h | 1 - arch/parisc/include/asm/compat.h | 1 - arch/powerpc/include/asm/compat.h | 1 - arch/s390/include/asm/compat.h | 1 - arch/sparc/include/asm/compat.h | 1 - arch/tile/include/asm/compat.h | 2 -- arch/x86/include/asm/compat.h | 2 -- arch/x86/kernel/signal_compat.c | 2 +- 8 files changed, 1 insertion(+), 10 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h index a3c7f271ad4c..dd32fe19ec58 100644 --- a/arch/arm64/include/asm/compat.h +++ b/arch/arm64/include/asm/compat.h @@ -174,7 +174,6 @@ typedef struct compat_siginfo { compat_timer_t _tid; /* timer id */ int _overrun; /* overrun count */ compat_sigval_t _sigval; /* same as below */ - int _sys_private; /* not to be passed to user */ } _timer; /* POSIX.1b signals */ diff --git a/arch/parisc/include/asm/compat.h b/arch/parisc/include/asm/compat.h index acf8aa07cbe0..cf3bcacec027 100644 --- a/arch/parisc/include/asm/compat.h +++ b/arch/parisc/include/asm/compat.h @@ -155,7 +155,6 @@ typedef struct compat_siginfo { int _overrun; /* overrun count */ char _pad[sizeof(unsigned int) - sizeof(int)]; compat_sigval_t _sigval; /* same as below */ - int _sys_private; /* not to be passed to user */ } _timer; /* POSIX.1b signals */ diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h index 8a2aecfe9b02..e02de2fd56e3 100644 --- a/arch/powerpc/include/asm/compat.h +++ b/arch/powerpc/include/asm/compat.h @@ -145,7 +145,6 @@ typedef struct compat_siginfo { compat_timer_t _tid; /* timer id */ int _overrun; /* overrun count */ compat_sigval_t _sigval; /* same as below */ - int _sys_private; /* not to be passed to user */ } _timer; /* POSIX.1b signals */ diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h index 5e6a63641a5f..3a187c4932a5 100644 --- a/arch/s390/include/asm/compat.h +++ b/arch/s390/include/asm/compat.h @@ -213,7 +213,6 @@ typedef struct compat_siginfo { compat_timer_t _tid; /* timer id */ int _overrun; /* overrun count */ compat_sigval_t _sigval; /* same as below */ - int _sys_private; /* not to be passed to user */ } _timer; /* POSIX.1b signals */ diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h index fa38c78de0f0..2d9f4fd5f74a 100644 --- a/arch/sparc/include/asm/compat.h +++ b/arch/sparc/include/asm/compat.h @@ -175,7 +175,6 @@ typedef struct compat_siginfo { compat_timer_t _tid; /* timer id */ int _overrun; /* overrun count */ compat_sigval_t _sigval; /* same as below */ - int _sys_private; /* not to be passed to user */ } _timer; /* POSIX.1b signals */ diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h index 62a7b83025dd..59ab9fa784b3 100644 --- a/arch/tile/include/asm/compat.h +++ b/arch/tile/include/asm/compat.h @@ -136,8 +136,6 @@ typedef struct compat_siginfo { compat_timer_t _tid; /* timer id */ int _overrun; /* overrun count */ compat_sigval_t _sigval; /* same as below */ - int _sys_private; /* not to be passed to user */ - int _overrun_incr; /* amount to add to overrun */ } _timer; /* POSIX.1b signals */ diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h index 2cbd75dd2fd3..1b6886a78562 100644 --- a/arch/x86/include/asm/compat.h +++ b/arch/x86/include/asm/compat.h @@ -151,8 +151,6 @@ typedef struct compat_siginfo { compat_timer_t _tid; /* timer id */ int _overrun; /* overrun count */ compat_sigval_t _sigval; /* same as below */ - int _sys_private; /* not to be passed to user */ - int _overrun_incr; /* amount to add to overrun */ } _timer; /* POSIX.1b signals */ diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c index 8c6da1a643da..85425ea30661 100644 --- a/arch/x86/kernel/signal_compat.c +++ b/arch/x86/kernel/signal_compat.c @@ -64,7 +64,7 @@ static inline void signal_compat_build_tests(void) CHECK_SI_SIZE (_kill, 2*sizeof(int)); CHECK_CSI_OFFSET(_timer); - CHECK_CSI_SIZE (_timer, 5*sizeof(int)); + CHECK_CSI_SIZE (_timer, 3*sizeof(int)); CHECK_SI_SIZE (_timer, 6*sizeof(int)); CHECK_CSI_OFFSET(_rt); -- cgit v1.2.3 From b713da69e4c91d9addada4e58d26df1c9b5cd840 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 9 Jul 2017 15:53:17 -0400 Subject: signal: unify compat_siginfo_t --EWB Added #ifdef CONFIG_X86_X32_ABI to arch/x86/kernel/signal_compat.c Changed #ifdef CONFIG_X86_X32 to #ifdef CONFIG_X86_X32_ABI in linux/compat.h CONFIG_X86_X32 is set when the user requests X32 support. CONFIG_X86_X32_ABI is set when the user requests X32 support and the tool-chain has X32 allowing X32 support to be built. Signed-off-by: Al Viro Signed-off-by: Eric W. Biederman --- arch/arm64/include/asm/compat.h | 63 --------------------------- arch/mips/include/asm/compat.h | 71 ------------------------------ arch/parisc/include/asm/compat.h | 63 --------------------------- arch/powerpc/include/asm/compat.h | 62 --------------------------- arch/s390/include/asm/compat.h | 72 ------------------------------- arch/sparc/include/asm/compat.h | 56 ------------------------ arch/tile/include/asm/compat.h | 58 ------------------------- arch/x86/include/asm/compat.h | 80 ---------------------------------- arch/x86/kernel/signal_compat.c | 4 ++ include/linux/compat.h | 90 +++++++++++++++++++++++++++++++++++++++ 10 files changed, 94 insertions(+), 525 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h index dd32fe19ec58..c00c62e1a4a3 100644 --- a/arch/arm64/include/asm/compat.h +++ b/arch/arm64/include/asm/compat.h @@ -150,69 +150,6 @@ typedef u32 compat_old_sigset_t; typedef u32 compat_sigset_word; -typedef union compat_sigval { - compat_int_t sival_int; - compat_uptr_t sival_ptr; -} compat_sigval_t; - -typedef struct compat_siginfo { - int si_signo; - int si_errno; - int si_code; - - union { - int _pad[128/sizeof(int) - 3]; - - /* kill() */ - struct { - compat_pid_t _pid; /* sender's pid */ - __compat_uid32_t _uid; /* sender's uid */ - } _kill; - - /* POSIX.1b timers */ - struct { - compat_timer_t _tid; /* timer id */ - int _overrun; /* overrun count */ - compat_sigval_t _sigval; /* same as below */ - } _timer; - - /* POSIX.1b signals */ - struct { - compat_pid_t _pid; /* sender's pid */ - __compat_uid32_t _uid; /* sender's uid */ - compat_sigval_t _sigval; - } _rt; - - /* SIGCHLD */ - struct { - compat_pid_t _pid; /* which child */ - __compat_uid32_t _uid; /* sender's uid */ - int _status; /* exit code */ - compat_clock_t _utime; - compat_clock_t _stime; - } _sigchld; - - /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ - struct { - compat_uptr_t _addr; /* faulting insn/memory ref. */ - short _addr_lsb; /* LSB of the reported address */ - } _sigfault; - - /* SIGPOLL */ - struct { - compat_long_t _band; /* POLL_IN, POLL_OUT, POLL_MSG */ - int _fd; - } _sigpoll; - - /* SIGSYS */ - struct { - compat_uptr_t _call_addr; /* calling user insn */ - int _syscall; /* triggering system call number */ - compat_uint_t _arch; /* AUDIT_ARCH_* of syscall */ - } _sigsys; - } _sifields; -} compat_siginfo_t; - #define COMPAT_OFF_T_MAX 0x7fffffff /* diff --git a/arch/mips/include/asm/compat.h b/arch/mips/include/asm/compat.h index 49691331ada4..fe7d445f675f 100644 --- a/arch/mips/include/asm/compat.h +++ b/arch/mips/include/asm/compat.h @@ -126,79 +126,8 @@ typedef u32 compat_old_sigset_t; /* at least 32 bits */ typedef u32 compat_sigset_word; -typedef union compat_sigval { - compat_int_t sival_int; - compat_uptr_t sival_ptr; -} compat_sigval_t; - -/* Can't use the generic version because si_code and si_errno are swapped */ - #define SI_PAD_SIZE32 (128/sizeof(int) - 3) -typedef struct compat_siginfo { - int si_signo; - int si_code; - int si_errno; - - union { - int _pad[128 / sizeof(int) - 3]; - - /* kill() */ - struct { - compat_pid_t _pid; /* sender's pid */ - __compat_uid32_t _uid; /* sender's uid */ - } _kill; - - /* POSIX.1b timers */ - struct { - compat_timer_t _tid; /* timer id */ - int _overrun; /* overrun count */ - compat_sigval_t _sigval; /* same as below */ - } _timer; - - /* POSIX.1b signals */ - struct { - compat_pid_t _pid; /* sender's pid */ - __compat_uid32_t _uid; /* sender's uid */ - compat_sigval_t _sigval; - } _rt; - - /* SIGCHLD */ - struct { - compat_pid_t _pid; /* which child */ - __compat_uid32_t _uid; /* sender's uid */ - int _status; /* exit code */ - compat_clock_t _utime; - compat_clock_t _stime; - } _sigchld; - - /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ - struct { - compat_uptr_t _addr; /* faulting insn/memory ref. */ -#ifdef __ARCH_SI_TRAPNO - int _trapno; /* TRAP # which caused the signal */ -#endif - short _addr_lsb; /* LSB of the reported address */ - struct { - compat_uptr_t _lower; - compat_uptr_t _upper; - } _addr_bnd; - } _sigfault; - - /* SIGPOLL */ - struct { - compat_long_t _band; /* POLL_IN, POLL_OUT, POLL_MSG */ - int _fd; - } _sigpoll; - - struct { - compat_uptr_t _call_addr; /* calling insn */ - int _syscall; /* triggering system call number */ - compat_uint_t _arch; /* AUDIT_ARCH_* of syscall */ - } _sigsys; - } _sifields; -} compat_siginfo_t; - #define COMPAT_OFF_T_MAX 0x7fffffff /* diff --git a/arch/parisc/include/asm/compat.h b/arch/parisc/include/asm/compat.h index cf3bcacec027..c22db5323244 100644 --- a/arch/parisc/include/asm/compat.h +++ b/arch/parisc/include/asm/compat.h @@ -130,69 +130,6 @@ typedef u32 compat_old_sigset_t; /* at least 32 bits */ typedef u32 compat_sigset_word; -typedef union compat_sigval { - compat_int_t sival_int; - compat_uptr_t sival_ptr; -} compat_sigval_t; - -typedef struct compat_siginfo { - int si_signo; - int si_errno; - int si_code; - - union { - int _pad[128/sizeof(int) - 3]; - - /* kill() */ - struct { - unsigned int _pid; /* sender's pid */ - unsigned int _uid; /* sender's uid */ - } _kill; - - /* POSIX.1b timers */ - struct { - compat_timer_t _tid; /* timer id */ - int _overrun; /* overrun count */ - char _pad[sizeof(unsigned int) - sizeof(int)]; - compat_sigval_t _sigval; /* same as below */ - } _timer; - - /* POSIX.1b signals */ - struct { - unsigned int _pid; /* sender's pid */ - unsigned int _uid; /* sender's uid */ - compat_sigval_t _sigval; - } _rt; - - /* SIGCHLD */ - struct { - unsigned int _pid; /* which child */ - unsigned int _uid; /* sender's uid */ - int _status; /* exit code */ - compat_clock_t _utime; - compat_clock_t _stime; - } _sigchld; - - /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ - struct { - unsigned int _addr; /* faulting insn/memory ref. */ - } _sigfault; - - /* SIGPOLL */ - struct { - int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ - int _fd; - } _sigpoll; - - /* SIGSYS */ - struct { - compat_uptr_t _call_addr; /* calling user insn */ - int _syscall; /* triggering system call number */ - compat_uint_t _arch; /* AUDIT_ARCH_* of syscall */ - } _sigsys; - } _sifields; -} compat_siginfo_t; - #define COMPAT_OFF_T_MAX 0x7fffffff struct compat_ipc64_perm { diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h index e02de2fd56e3..8a2363221b0c 100644 --- a/arch/powerpc/include/asm/compat.h +++ b/arch/powerpc/include/asm/compat.h @@ -119,70 +119,8 @@ typedef u32 compat_old_sigset_t; typedef u32 compat_sigset_word; -typedef union compat_sigval { - compat_int_t sival_int; - compat_uptr_t sival_ptr; -} compat_sigval_t; - #define SI_PAD_SIZE32 (128/sizeof(int) - 3) -typedef struct compat_siginfo { - int si_signo; - int si_errno; - int si_code; - - union { - int _pad[SI_PAD_SIZE32]; - - /* kill() */ - struct { - compat_pid_t _pid; /* sender's pid */ - __compat_uid_t _uid; /* sender's uid */ - } _kill; - - /* POSIX.1b timers */ - struct { - compat_timer_t _tid; /* timer id */ - int _overrun; /* overrun count */ - compat_sigval_t _sigval; /* same as below */ - } _timer; - - /* POSIX.1b signals */ - struct { - compat_pid_t _pid; /* sender's pid */ - __compat_uid_t _uid; /* sender's uid */ - compat_sigval_t _sigval; - } _rt; - - /* SIGCHLD */ - struct { - compat_pid_t _pid; /* which child */ - __compat_uid_t _uid; /* sender's uid */ - int _status; /* exit code */ - compat_clock_t _utime; - compat_clock_t _stime; - } _sigchld; - - /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */ - struct { - unsigned int _addr; /* faulting insn/memory ref. */ - } _sigfault; - - /* SIGPOLL */ - struct { - int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ - int _fd; - } _sigpoll; - - /* SIGSYS */ - struct { - unsigned int _call_addr; /* calling insn */ - int _syscall; /* triggering system call number */ - unsigned int _arch; /* AUDIT_ARCH_* of syscall */ - } _sigsys; - } _sifields; -} compat_siginfo_t; - #define COMPAT_OFF_T_MAX 0x7fffffff /* diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h index 3a187c4932a5..9830fb6b076e 100644 --- a/arch/s390/include/asm/compat.h +++ b/arch/s390/include/asm/compat.h @@ -189,78 +189,6 @@ typedef u32 compat_old_sigset_t; /* at least 32 bits */ typedef u32 compat_sigset_word; -typedef union compat_sigval { - compat_int_t sival_int; - compat_uptr_t sival_ptr; -} compat_sigval_t; - -typedef struct compat_siginfo { - int si_signo; - int si_errno; - int si_code; - - union { - int _pad[128/sizeof(int) - 3]; - - /* kill() */ - struct { - pid_t _pid; /* sender's pid */ - uid_t _uid; /* sender's uid */ - } _kill; - - /* POSIX.1b timers */ - struct { - compat_timer_t _tid; /* timer id */ - int _overrun; /* overrun count */ - compat_sigval_t _sigval; /* same as below */ - } _timer; - - /* POSIX.1b signals */ - struct { - pid_t _pid; /* sender's pid */ - uid_t _uid; /* sender's uid */ - compat_sigval_t _sigval; - } _rt; - - /* SIGCHLD */ - struct { - pid_t _pid; /* which child */ - uid_t _uid; /* sender's uid */ - int _status;/* exit code */ - compat_clock_t _utime; - compat_clock_t _stime; - } _sigchld; - - /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ - struct { - __u32 _addr; /* faulting insn/memory ref. - pointer */ - } _sigfault; - - /* SIGPOLL */ - struct { - int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ - int _fd; - } _sigpoll; - } _sifields; -} compat_siginfo_t; - -/* - * How these fields are to be accessed. - */ -#define si_pid _sifields._kill._pid -#define si_uid _sifields._kill._uid -#define si_status _sifields._sigchld._status -#define si_utime _sifields._sigchld._utime -#define si_stime _sifields._sigchld._stime -#define si_value _sifields._rt._sigval -#define si_int _sifields._rt._sigval.sival_int -#define si_ptr _sifields._rt._sigval.sival_ptr -#define si_addr _sifields._sigfault._addr -#define si_band _sifields._sigpoll._band -#define si_fd _sifields._sigpoll._fd -#define si_tid _sifields._timer._tid -#define si_overrun _sifields._timer._overrun - #define COMPAT_OFF_T_MAX 0x7fffffff /* diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h index 2d9f4fd5f74a..c3688ae98b90 100644 --- a/arch/sparc/include/asm/compat.h +++ b/arch/sparc/include/asm/compat.h @@ -149,64 +149,8 @@ typedef u32 compat_old_sigset_t; typedef u32 compat_sigset_word; -typedef union compat_sigval { - compat_int_t sival_int; - compat_uptr_t sival_ptr; -} compat_sigval_t; - #define SI_PAD_SIZE32 (128/sizeof(int) - 3) -typedef struct compat_siginfo { - int si_signo; - int si_errno; - int si_code; - - union { - int _pad[SI_PAD_SIZE32]; - - /* kill() */ - struct { - compat_pid_t _pid; /* sender's pid */ - unsigned int _uid; /* sender's uid */ - } _kill; - - /* POSIX.1b timers */ - struct { - compat_timer_t _tid; /* timer id */ - int _overrun; /* overrun count */ - compat_sigval_t _sigval; /* same as below */ - } _timer; - - /* POSIX.1b signals */ - struct { - compat_pid_t _pid; /* sender's pid */ - unsigned int _uid; /* sender's uid */ - compat_sigval_t _sigval; - } _rt; - - /* SIGCHLD */ - struct { - compat_pid_t _pid; /* which child */ - unsigned int _uid; /* sender's uid */ - int _status; /* exit code */ - compat_clock_t _utime; - compat_clock_t _stime; - } _sigchld; - - /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */ - struct { - u32 _addr; /* faulting insn/memory ref. */ - int _trapno; - } _sigfault; - - /* SIGPOLL */ - struct { - int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ - int _fd; - } _sigpoll; - } _sifields; -} compat_siginfo_t; - #define COMPAT_OFF_T_MAX 0x7fffffff /* diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h index 59ab9fa784b3..c6b7613256b4 100644 --- a/arch/tile/include/asm/compat.h +++ b/arch/tile/include/asm/compat.h @@ -110,66 +110,8 @@ struct compat_flock64 { typedef u32 compat_sigset_word; -typedef union compat_sigval { - compat_int_t sival_int; - compat_uptr_t sival_ptr; -} compat_sigval_t; - #define COMPAT_SI_PAD_SIZE (128/sizeof(int) - 3) -typedef struct compat_siginfo { - int si_signo; - int si_errno; - int si_code; - - union { - int _pad[COMPAT_SI_PAD_SIZE]; - - /* kill() */ - struct { - unsigned int _pid; /* sender's pid */ - unsigned int _uid; /* sender's uid */ - } _kill; - - /* POSIX.1b timers */ - struct { - compat_timer_t _tid; /* timer id */ - int _overrun; /* overrun count */ - compat_sigval_t _sigval; /* same as below */ - } _timer; - - /* POSIX.1b signals */ - struct { - unsigned int _pid; /* sender's pid */ - unsigned int _uid; /* sender's uid */ - compat_sigval_t _sigval; - } _rt; - - /* SIGCHLD */ - struct { - unsigned int _pid; /* which child */ - unsigned int _uid; /* sender's uid */ - int _status; /* exit code */ - compat_clock_t _utime; - compat_clock_t _stime; - } _sigchld; - - /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ - struct { - unsigned int _addr; /* faulting insn/memory ref. */ -#ifdef __ARCH_SI_TRAPNO - int _trapno; /* TRAP # which caused the signal */ -#endif - } _sigfault; - - /* SIGPOLL */ - struct { - int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ - int _fd; - } _sigpoll; - } _sifields; -} compat_siginfo_t; - #define COMPAT_OFF_T_MAX 0x7fffffff struct compat_ipc64_perm { diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h index 1b6886a78562..0b76fc91f672 100644 --- a/arch/x86/include/asm/compat.h +++ b/arch/x86/include/asm/compat.h @@ -127,86 +127,6 @@ typedef u32 compat_old_sigset_t; /* at least 32 bits */ typedef u32 compat_sigset_word; -typedef union compat_sigval { - compat_int_t sival_int; - compat_uptr_t sival_ptr; -} compat_sigval_t; - -typedef struct compat_siginfo { - int si_signo; - int si_errno; - int si_code; - - union { - int _pad[128/sizeof(int) - 3]; - - /* kill() */ - struct { - unsigned int _pid; /* sender's pid */ - unsigned int _uid; /* sender's uid */ - } _kill; - - /* POSIX.1b timers */ - struct { - compat_timer_t _tid; /* timer id */ - int _overrun; /* overrun count */ - compat_sigval_t _sigval; /* same as below */ - } _timer; - - /* POSIX.1b signals */ - struct { - unsigned int _pid; /* sender's pid */ - unsigned int _uid; /* sender's uid */ - compat_sigval_t _sigval; - } _rt; - - /* SIGCHLD */ - struct { - unsigned int _pid; /* which child */ - unsigned int _uid; /* sender's uid */ - int _status; /* exit code */ - compat_clock_t _utime; - compat_clock_t _stime; - } _sigchld; - - /* SIGCHLD (x32 version) */ - struct { - unsigned int _pid; /* which child */ - unsigned int _uid; /* sender's uid */ - int _status; /* exit code */ - compat_s64 _utime; - compat_s64 _stime; - } _sigchld_x32; - - /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ - struct { - unsigned int _addr; /* faulting insn/memory ref. */ - short int _addr_lsb; /* Valid LSB of the reported address. */ - union { - /* used when si_code=SEGV_BNDERR */ - struct { - compat_uptr_t _lower; - compat_uptr_t _upper; - } _addr_bnd; - /* used when si_code=SEGV_PKUERR */ - compat_u32 _pkey; - }; - } _sigfault; - - /* SIGPOLL */ - struct { - int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ - int _fd; - } _sigpoll; - - struct { - unsigned int _call_addr; /* calling insn */ - int _syscall; /* triggering system call number */ - unsigned int _arch; /* AUDIT_ARCH_* of syscall */ - } _sigsys; - } _sifields; -} compat_siginfo_t; - #define COMPAT_OFF_T_MAX 0x7fffffff struct compat_ipc64_perm { diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c index 85425ea30661..27495909932d 100644 --- a/arch/x86/kernel/signal_compat.c +++ b/arch/x86/kernel/signal_compat.c @@ -75,9 +75,11 @@ static inline void signal_compat_build_tests(void) CHECK_CSI_SIZE (_sigchld, 5*sizeof(int)); CHECK_SI_SIZE (_sigchld, 8*sizeof(int)); +#ifdef CONFIG_X86_X32_ABI CHECK_CSI_OFFSET(_sigchld_x32); CHECK_CSI_SIZE (_sigchld_x32, 7*sizeof(int)); /* no _sigchld_x32 in the generic siginfo_t */ +#endif CHECK_CSI_OFFSET(_sigfault); CHECK_CSI_SIZE (_sigfault, 4*sizeof(int)); @@ -169,9 +171,11 @@ int __copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from, if (!x32_ABI) { put_user_ex(from->si_utime, &to->si_utime); put_user_ex(from->si_stime, &to->si_stime); +#ifdef CONFIG_X86_X32_ABI } else { put_user_ex(from->si_utime, &to->_sifields._sigchld_x32._utime); put_user_ex(from->si_stime, &to->_sifields._sigchld_x32._stime); +#endif } put_user_ex(from->si_status, &to->si_status); /* FALL THROUGH */ diff --git a/include/linux/compat.h b/include/linux/compat.h index 0fc36406f32c..8f8e3ef247de 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -157,6 +157,96 @@ struct compat_sigaction { compat_sigset_t sa_mask __packed; }; +typedef union compat_sigval { + compat_int_t sival_int; + compat_uptr_t sival_ptr; +} compat_sigval_t; + +typedef struct compat_siginfo { + int si_signo; +#ifndef __ARCH_HAS_SWAPPED_SIGINFO + int si_errno; + int si_code; +#else + int si_code; + int si_errno; +#endif + + union { + int _pad[128/sizeof(int) - 3]; + + /* kill() */ + struct { + compat_pid_t _pid; /* sender's pid */ + __compat_uid32_t _uid; /* sender's uid */ + } _kill; + + /* POSIX.1b timers */ + struct { + compat_timer_t _tid; /* timer id */ + int _overrun; /* overrun count */ + compat_sigval_t _sigval; /* same as below */ + } _timer; + + /* POSIX.1b signals */ + struct { + compat_pid_t _pid; /* sender's pid */ + __compat_uid32_t _uid; /* sender's uid */ + compat_sigval_t _sigval; + } _rt; + + /* SIGCHLD */ + struct { + compat_pid_t _pid; /* which child */ + __compat_uid32_t _uid; /* sender's uid */ + int _status; /* exit code */ + compat_clock_t _utime; + compat_clock_t _stime; + } _sigchld; + +#ifdef CONFIG_X86_X32_ABI + /* SIGCHLD (x32 version) */ + struct { + compat_pid_t _pid; /* which child */ + __compat_uid32_t _uid; /* sender's uid */ + int _status; /* exit code */ + compat_s64 _utime; + compat_s64 _stime; + } _sigchld_x32; +#endif + + /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */ + struct { + compat_uptr_t _addr; /* faulting insn/memory ref. */ +#ifdef __ARCH_SI_TRAPNO + int _trapno; /* TRAP # which caused the signal */ +#endif + short int _addr_lsb; /* Valid LSB of the reported address. */ + union { + /* used when si_code=SEGV_BNDERR */ + struct { + compat_uptr_t _lower; + compat_uptr_t _upper; + } _addr_bnd; + /* used when si_code=SEGV_PKUERR */ + u32 _pkey; + }; + } _sigfault; + + /* SIGPOLL */ + struct { + compat_long_t _band; /* POLL_IN, POLL_OUT, POLL_MSG */ + int _fd; + } _sigpoll; + + struct { + compat_uptr_t _call_addr; /* calling user insn */ + int _syscall; /* triggering system call number */ + unsigned int _arch; /* AUDIT_ARCH_* of syscall */ + } _sigsys; + } _sifields; +} compat_siginfo_t; + /* * These functions operate on 32- or 64-bit specs depending on * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments. -- cgit v1.2.3 From ad2b1ab57ddb9cd0a9e93aae8b5f3ca9a0c77f1d Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Sat, 13 Jan 2018 15:12:46 -0600 Subject: signal/powerpc: Remove redefinition of NSIGTRAP on powerpc NSIGTRAP is 4 in the generic siginfo and powerpc just undefines NSGTRAP and redefine it as 4. That accomplishes nothing so remove the duplication. Signed-off-by: "Eric W. Biederman" --- arch/powerpc/include/uapi/asm/siginfo.h | 3 --- 1 file changed, 3 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/uapi/asm/siginfo.h b/arch/powerpc/include/uapi/asm/siginfo.h index 444ca6c9989a..9f142451a01f 100644 --- a/arch/powerpc/include/uapi/asm/siginfo.h +++ b/arch/powerpc/include/uapi/asm/siginfo.h @@ -15,9 +15,6 @@ #include -#undef NSIGTRAP -#define NSIGTRAP 4 - /* * SIGFPE si_codes */ -- cgit v1.2.3 From 212a36a17efe4d696d1e3c31ebd79a9fb0cbb14b Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 31 Jul 2017 17:15:31 -0500 Subject: signal: Unify and correct copy_siginfo_from_user32 The function copy_siginfo_from_user32 is used for two things, in ptrace since the dawn of siginfo for arbirarily modifying a signal that user space sees, and in sigqueueinfo to send a signal with arbirary siginfo data. Create a single copy of copy_siginfo_from_user32 that all architectures share, and teach it to handle all of the cases in the siginfo union. In the generic version of copy_siginfo_from_user32 ensure that all of the fields in siginfo are initialized so that the siginfo structure can be safely copied to userspace if necessary. When copying the embedded sigval union copy the si_int member. That ensures the 32bit values passes through the kernel unchanged. Signed-off-by: "Eric W. Biederman" --- arch/arm64/kernel/signal32.c | 10 ----- arch/mips/kernel/signal32.c | 10 ----- arch/parisc/kernel/signal32.c | 44 ---------------------- arch/parisc/kernel/signal32.h | 1 - arch/powerpc/kernel/signal_32.c | 9 ----- arch/s390/kernel/compat_signal.c | 48 ------------------------ arch/sparc/kernel/signal32.c | 16 -------- arch/tile/kernel/compat_signal.c | 18 --------- arch/x86/kernel/signal_compat.c | 21 ----------- include/linux/compat.h | 2 +- kernel/signal.c | 81 ++++++++++++++++++++++++++++++++++++++++ 11 files changed, 82 insertions(+), 178 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c index 22711ee8e36c..4377907dbb70 100644 --- a/arch/arm64/kernel/signal32.c +++ b/arch/arm64/kernel/signal32.c @@ -195,16 +195,6 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) return err; } -int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) -{ - if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) || - copy_from_user(to->_sifields._pad, - from->_sifields._pad, SI_PAD_SIZE)) - return -EFAULT; - - return 0; -} - /* * VFP save/restore code. * diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c index cf5c7c05e5a3..500b5e4634ea 100644 --- a/arch/mips/kernel/signal32.c +++ b/arch/mips/kernel/signal32.c @@ -133,13 +133,3 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) } return err; } - -int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) -{ - if (copy_from_user(to, from, 3*sizeof(int)) || - copy_from_user(to->_sifields._pad, - from->_sifields._pad, SI_PAD_SIZE32)) - return -EFAULT; - - return 0; -} diff --git a/arch/parisc/kernel/signal32.c b/arch/parisc/kernel/signal32.c index 41afa9cd1f55..558e32475c35 100644 --- a/arch/parisc/kernel/signal32.c +++ b/arch/parisc/kernel/signal32.c @@ -261,50 +261,6 @@ setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __ return err; } -int -copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from) -{ - compat_uptr_t addr; - int err; - - if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t))) - return -EFAULT; - - err = __get_user(to->si_signo, &from->si_signo); - err |= __get_user(to->si_errno, &from->si_errno); - err |= __get_user(to->si_code, &from->si_code); - - if (to->si_code < 0) - err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); - else { - switch (siginfo_layout(to->si_signo, to->si_code)) { - case SIL_CHLD: - err |= __get_user(to->si_utime, &from->si_utime); - err |= __get_user(to->si_stime, &from->si_stime); - err |= __get_user(to->si_status, &from->si_status); - default: - case SIL_KILL: - err |= __get_user(to->si_pid, &from->si_pid); - err |= __get_user(to->si_uid, &from->si_uid); - break; - case SIL_FAULT: - err |= __get_user(addr, &from->si_addr); - to->si_addr = compat_ptr(addr); - break; - case SIL_POLL: - err |= __get_user(to->si_band, &from->si_band); - err |= __get_user(to->si_fd, &from->si_fd); - break; - case SIL_RT: - err |= __get_user(to->si_pid, &from->si_pid); - err |= __get_user(to->si_uid, &from->si_uid); - err |= __get_user(to->si_int, &from->si_int); - break; - } - } - return err; -} - int copy_siginfo_to_user32 (compat_siginfo_t __user *to, const siginfo_t *from) { diff --git a/arch/parisc/kernel/signal32.h b/arch/parisc/kernel/signal32.h index 719e7417732c..d25858e4db63 100644 --- a/arch/parisc/kernel/signal32.h +++ b/arch/parisc/kernel/signal32.h @@ -35,7 +35,6 @@ struct compat_ucontext { /* ELF32 signal handling */ int copy_siginfo_to_user32 (compat_siginfo_t __user *to, const siginfo_t *from); -int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from); /* In a deft move of uber-hackery, we decide to carry the top half of all * 64-bit registers in a non-portable, non-ABI, hidden structure. diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c index 9ffd73296f64..ee62ff7b296c 100644 --- a/arch/powerpc/kernel/signal_32.c +++ b/arch/powerpc/kernel/signal_32.c @@ -933,15 +933,6 @@ int copy_siginfo_to_user32(struct compat_siginfo __user *d, const siginfo_t *s) #define copy_siginfo_to_user copy_siginfo_to_user32 -int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from) -{ - if (copy_from_user(to, from, 3*sizeof(int)) || - copy_from_user(to->_sifields._pad, - from->_sifields._pad, SI_PAD_SIZE32)) - return -EFAULT; - - return 0; -} #endif /* CONFIG_PPC64 */ /* diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c index ef246940b44c..d77ce14ffa5c 100644 --- a/arch/s390/kernel/compat_signal.c +++ b/arch/s390/kernel/compat_signal.c @@ -102,54 +102,6 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) return err ? -EFAULT : 0; } -int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) -{ - int err; - u32 tmp; - - err = __get_user(to->si_signo, &from->si_signo); - err |= __get_user(to->si_errno, &from->si_errno); - err |= __get_user(to->si_code, &from->si_code); - - if (to->si_code < 0) - err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); - else { - switch (siginfo_layout(to->si_signo, to->si_code)) { - case SIL_RT: - err |= __get_user(to->si_int, &from->si_int); - /* fallthrough */ - case SIL_KILL: - err |= __get_user(to->si_pid, &from->si_pid); - err |= __get_user(to->si_uid, &from->si_uid); - break; - case SIL_CHLD: - err |= __get_user(to->si_pid, &from->si_pid); - err |= __get_user(to->si_uid, &from->si_uid); - err |= __get_user(to->si_utime, &from->si_utime); - err |= __get_user(to->si_stime, &from->si_stime); - err |= __get_user(to->si_status, &from->si_status); - break; - case SIL_FAULT: - err |= __get_user(tmp, &from->si_addr); - to->si_addr = (void __force __user *) - (u64) (tmp & PSW32_ADDR_INSN); - break; - case SIL_POLL: - err |= __get_user(to->si_band, &from->si_band); - err |= __get_user(to->si_fd, &from->si_fd); - break; - case SIL_TIMER: - err |= __get_user(to->si_tid, &from->si_tid); - err |= __get_user(to->si_overrun, &from->si_overrun); - err |= __get_user(to->si_int, &from->si_int); - break; - default: - break; - } - } - return err ? -EFAULT : 0; -} - /* Store registers needed to create the signal frame */ static void store_sigregs(void) { diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c index 54a6159b9cd8..8022bb4c65a5 100644 --- a/arch/sparc/kernel/signal32.c +++ b/arch/sparc/kernel/signal32.c @@ -123,22 +123,6 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) return err; } -/* CAUTION: This is just a very minimalist implementation for the - * sake of compat_sys_rt_sigqueueinfo() - */ -int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) -{ - if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t))) - return -EFAULT; - - if (copy_from_user(to, from, 3*sizeof(int)) || - copy_from_user(to->_sifields._pad, from->_sifields._pad, - SI_PAD_SIZE)) - return -EFAULT; - - return 0; -} - /* Checks if the fp is valid. We always build signal frames which are * 16-byte aligned, therefore we can always enforce that the restore * frame has that property as well. diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c index 971d87a1d8cf..4e7f40a10eb3 100644 --- a/arch/tile/kernel/compat_signal.c +++ b/arch/tile/kernel/compat_signal.c @@ -105,24 +105,6 @@ int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *fr return err; } -int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from) -{ - int err; - - if (!access_ok(VERIFY_READ, from, sizeof(struct compat_siginfo))) - return -EFAULT; - - err = __get_user(to->si_signo, &from->si_signo); - err |= __get_user(to->si_errno, &from->si_errno); - err |= __get_user(to->si_code, &from->si_code); - - err |= __get_user(to->si_pid, &from->si_pid); - err |= __get_user(to->si_uid, &from->si_uid); - err |= __get_user(to->si_int, &from->si_int); - - return err; -} - /* The assembly shim for this function arranges to ignore the return value. */ long compat_sys_rt_sigreturn(void) { diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c index feb3ac135d0c..59148de2d83f 100644 --- a/arch/x86/kernel/signal_compat.c +++ b/arch/x86/kernel/signal_compat.c @@ -207,24 +207,3 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) return __copy_siginfo_to_user32(to, from, in_x32_syscall()); } -int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) -{ - int err = 0; - u32 ptr32; - - if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t))) - return -EFAULT; - - get_user_try { - get_user_ex(to->si_signo, &from->si_signo); - get_user_ex(to->si_errno, &from->si_errno); - get_user_ex(to->si_code, &from->si_code); - - get_user_ex(to->si_pid, &from->si_pid); - get_user_ex(to->si_uid, &from->si_uid); - get_user_ex(ptr32, &from->si_ptr); - to->si_ptr = compat_ptr(ptr32); - } get_user_catch(err); - - return err; -} diff --git a/include/linux/compat.h b/include/linux/compat.h index e698ec1908d9..8a9643857c4a 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -510,7 +510,7 @@ long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, unsigned long bitmap_size); long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, unsigned long bitmap_size); -int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from); +int copy_siginfo_from_user32(siginfo_t *to, const struct compat_siginfo __user *from); int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from); int get_compat_sigevent(struct sigevent *event, const struct compat_sigevent __user *u_event); diff --git a/kernel/signal.c b/kernel/signal.c index 4c3f4448c5f1..5211b1b57163 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -2814,6 +2814,87 @@ int copy_siginfo_to_user(siginfo_t __user *to, const siginfo_t *from) return err; } +#ifdef CONFIG_COMPAT +int copy_siginfo_from_user32(struct siginfo *to, + const struct compat_siginfo __user *ufrom) +{ + struct compat_siginfo from; + + if (copy_from_user(&from, ufrom, sizeof(struct compat_siginfo))) + return -EFAULT; + + clear_siginfo(to); + to->si_signo = from.si_signo; + to->si_errno = from.si_errno; + to->si_code = from.si_code; + switch(siginfo_layout(from.si_signo, from.si_code)) { + case SIL_KILL: + to->si_pid = from.si_pid; + to->si_uid = from.si_uid; + break; + case SIL_TIMER: + to->si_tid = from.si_tid; + to->si_overrun = from.si_overrun; + to->si_int = from.si_int; + break; + case SIL_POLL: + to->si_band = from.si_band; + to->si_fd = from.si_fd; + break; + case SIL_FAULT: + to->si_addr = compat_ptr(from.si_addr); +#ifdef __ARCH_SI_TRAPNO + to->si_trapno = from.si_trapno; +#endif +#ifdef BUS_MCEERR_AR + if ((from.si_signo == SIGBUS) && (from.si_code == BUS_MCEERR_AR)) + to->si_addr_lsb = from.si_addr_lsb; +#endif +#ifdef BUS_MCEER_AO + if ((from.si_signo == SIGBUS) && (from.si_code == BUS_MCEERR_AO)) + to->si_addr_lsb = from.si_addr_lsb; +#endif +#ifdef SEGV_BNDERR + if ((from.si_signo == SIGSEGV) && (from.si_code == SEGV_BNDERR)) { + to->si_lower = compat_ptr(from.si_lower); + to->si_upper = compat_ptr(from.si_upper); + } +#endif +#ifdef SEGV_PKUERR + if ((from.si_signo == SIGSEGV) && (from.si_code == SEGV_PKUERR)) + to->si_pkey = from.si_pkey; +#endif + break; + case SIL_CHLD: + to->si_pid = from.si_pid; + to->si_uid = from.si_uid; + to->si_status = from.si_status; +#ifdef CONFIG_X86_X32_ABI + if (in_x32_syscall()) { + to->si_utime = from._sifields._sigchld_x32._utime; + to->si_stime = from._sifields._sigchld_x32._stime; + } else +#endif + { + to->si_utime = from.si_utime; + to->si_stime = from.si_stime; + } + break; + case SIL_RT: + to->si_pid = from.si_pid; + to->si_uid = from.si_uid; + to->si_int = from.si_int; + break; + case SIL_SYS: + to->si_call_addr = compat_ptr(from.si_call_addr); + to->si_syscall = from.si_syscall; + to->si_arch = from.si_arch; + break; + } + return 0; +} +#endif /* CONFIG_COMPAT */ + /** * do_sigtimedwait - wait for queued signals specified in @which * @which: queued signals to wait for -- cgit v1.2.3 From ea64d5acc8f033cd586182ae31531246cdeaea73 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 15 Jan 2018 18:03:33 -0600 Subject: signal: Unify and correct copy_siginfo_to_user32 Among the existing architecture specific versions of copy_siginfo_to_user32 there are several different implementation problems. Some architectures fail to handle all of the cases in in the siginfo union. Some architectures perform a blind copy of the siginfo union when the si_code is negative. A blind copy suggests the data is expected to be in 32bit siginfo format, which means that receiving such a signal via signalfd won't work, or that the data is in 64bit siginfo and the code is copying nonsense to userspace. Create a single instance of copy_siginfo_to_user32 that all of the architectures can share, and teach it to handle all of the cases in the siginfo union correctly, with the assumption that siginfo is stored internally to the kernel is 64bit siginfo format. A special case is made for x86 x32 format. This is needed as presence of both x32 and ia32 on x86_64 results in two different 32bit signal formats. By allowing this small special case there winds up being exactly one code base that needs to be maintained between all of the architectures. Vastly increasing the testing base and the chances of finding bugs. As the x86 copy of copy_siginfo_to_user32 the call of the x86 signal_compat_build_tests were moved into sigaction_compat_abi, so that they will keep running. Signed-off-by: "Eric W. Biederman" --- arch/arm64/kernel/signal32.c | 70 ---------------------------- arch/mips/include/asm/compat.h | 2 - arch/mips/kernel/signal32.c | 57 ----------------------- arch/parisc/kernel/signal32.c | 62 ------------------------- arch/parisc/kernel/signal32.h | 2 - arch/powerpc/include/asm/compat.h | 2 - arch/powerpc/kernel/signal_32.c | 57 ----------------------- arch/s390/kernel/compat_signal.c | 52 --------------------- arch/sparc/include/asm/compat.h | 2 - arch/sparc/kernel/signal32.c | 53 --------------------- arch/tile/include/asm/compat.h | 2 - arch/tile/kernel/compat_signal.c | 55 ---------------------- arch/x86/include/asm/compat.h | 4 ++ arch/x86/include/asm/fpu/signal.h | 6 --- arch/x86/kernel/signal_compat.c | 96 +-------------------------------------- kernel/signal.c | 90 ++++++++++++++++++++++++++++++++++++ 16 files changed, 96 insertions(+), 516 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c index 4377907dbb70..cbc4edd1b1eb 100644 --- a/arch/arm64/kernel/signal32.c +++ b/arch/arm64/kernel/signal32.c @@ -125,76 +125,6 @@ static inline int get_sigset_t(sigset_t *set, return 0; } -int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) -{ - int err; - - if (!access_ok(VERIFY_WRITE, to, sizeof(*to))) - return -EFAULT; - - /* If you change siginfo_t structure, please be sure - * this code is fixed accordingly. - * It should never copy any pad contained in the structure - * to avoid security leaks, but must copy the generic - * 3 ints plus the relevant union member. - * This routine must convert siginfo from 64bit to 32bit as well - * at the same time. - */ - err = __put_user(from->si_signo, &to->si_signo); - err |= __put_user(from->si_errno, &to->si_errno); - err |= __put_user(from->si_code, &to->si_code); - if (from->si_code < 0) - err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, - SI_PAD_SIZE); - else switch (siginfo_layout(from->si_signo, from->si_code)) { - case SIL_KILL: - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - break; - case SIL_TIMER: - err |= __put_user(from->si_tid, &to->si_tid); - err |= __put_user(from->si_overrun, &to->si_overrun); - err |= __put_user(from->si_int, &to->si_int); - break; - case SIL_POLL: - err |= __put_user(from->si_band, &to->si_band); - err |= __put_user(from->si_fd, &to->si_fd); - break; - case SIL_FAULT: - err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr, - &to->si_addr); -#ifdef BUS_MCEERR_AO - /* - * Other callers might not initialize the si_lsb field, - * so check explicitly for the right codes here. - */ - if (from->si_signo == SIGBUS && - (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)) - err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb); -#endif - break; - case SIL_CHLD: - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - err |= __put_user(from->si_status, &to->si_status); - err |= __put_user(from->si_utime, &to->si_utime); - err |= __put_user(from->si_stime, &to->si_stime); - break; - case SIL_RT: - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - err |= __put_user(from->si_int, &to->si_int); - break; - case SIL_SYS: - err |= __put_user((compat_uptr_t)(unsigned long) - from->si_call_addr, &to->si_call_addr); - err |= __put_user(from->si_syscall, &to->si_syscall); - err |= __put_user(from->si_arch, &to->si_arch); - break; - } - return err; -} - /* * VFP save/restore code. * diff --git a/arch/mips/include/asm/compat.h b/arch/mips/include/asm/compat.h index fe7d445f675f..946681db8dc3 100644 --- a/arch/mips/include/asm/compat.h +++ b/arch/mips/include/asm/compat.h @@ -126,8 +126,6 @@ typedef u32 compat_old_sigset_t; /* at least 32 bits */ typedef u32 compat_sigset_word; -#define SI_PAD_SIZE32 (128/sizeof(int) - 3) - #define COMPAT_OFF_T_MAX 0x7fffffff /* diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c index 500b5e4634ea..c4db910a8794 100644 --- a/arch/mips/kernel/signal32.c +++ b/arch/mips/kernel/signal32.c @@ -76,60 +76,3 @@ SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, return ret; } - -int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) -{ - int err; - - if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) - return -EFAULT; - - /* If you change siginfo_t structure, please be sure - this code is fixed accordingly. - It should never copy any pad contained in the structure - to avoid security leaks, but must copy the generic - 3 ints plus the relevant union member. - This routine must convert siginfo from 64bit to 32bit as well - at the same time. */ - err = __put_user(from->si_signo, &to->si_signo); - err |= __put_user(from->si_errno, &to->si_errno); - err |= __put_user(from->si_code, &to->si_code); - if (from->si_code < 0) - err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); - else { - switch (siginfo_layout(from->si_signo, from->si_code)) { - case SIL_TIMER: - err |= __put_user(from->si_tid, &to->si_tid); - err |= __put_user(from->si_overrun, &to->si_overrun); - err |= __put_user(from->si_int, &to->si_int); - break; - case SIL_CHLD: - err |= __put_user(from->si_utime, &to->si_utime); - err |= __put_user(from->si_stime, &to->si_stime); - err |= __put_user(from->si_status, &to->si_status); - case SIL_KILL: - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - break; - case SIL_FAULT: - err |= __put_user((unsigned long)from->si_addr, &to->si_addr); - break; - case SIL_POLL: - err |= __put_user(from->si_band, &to->si_band); - err |= __put_user(from->si_fd, &to->si_fd); - break; - case SIL_RT: - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - err |= __put_user(from->si_int, &to->si_int); - break; - case SIL_SYS: - err |= __copy_to_user(&to->si_call_addr, &from->si_call_addr, - sizeof(compat_uptr_t)); - err |= __put_user(from->si_syscall, &to->si_syscall); - err |= __put_user(from->si_arch, &to->si_arch); - break; - } - } - return err; -} diff --git a/arch/parisc/kernel/signal32.c b/arch/parisc/kernel/signal32.c index 558e32475c35..e8ef3eb69449 100644 --- a/arch/parisc/kernel/signal32.c +++ b/arch/parisc/kernel/signal32.c @@ -260,65 +260,3 @@ setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __ return err; } - -int -copy_siginfo_to_user32 (compat_siginfo_t __user *to, const siginfo_t *from) -{ - compat_uptr_t addr; - compat_int_t val; - int err; - - if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) - return -EFAULT; - - /* If you change siginfo_t structure, please be sure - this code is fixed accordingly. - It should never copy any pad contained in the structure - to avoid security leaks, but must copy the generic - 3 ints plus the relevant union member. - This routine must convert siginfo from 64bit to 32bit as well - at the same time. */ - err = __put_user(from->si_signo, &to->si_signo); - err |= __put_user(from->si_errno, &to->si_errno); - err |= __put_user(from->si_code, &to->si_code); - if (from->si_code < 0) - err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); - else { - switch (siginfo_layout(from->si_signo, from->si_code)) { - case SIL_CHLD: - err |= __put_user(from->si_utime, &to->si_utime); - err |= __put_user(from->si_stime, &to->si_stime); - err |= __put_user(from->si_status, &to->si_status); - case SIL_KILL: - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - break; - case SIL_FAULT: - addr = ptr_to_compat(from->si_addr); - err |= __put_user(addr, &to->si_addr); - break; - case SIL_POLL: - err |= __put_user(from->si_band, &to->si_band); - err |= __put_user(from->si_fd, &to->si_fd); - break; - case SIL_TIMER: - err |= __put_user(from->si_tid, &to->si_tid); - err |= __put_user(from->si_overrun, &to->si_overrun); - val = (compat_int_t)from->si_int; - err |= __put_user(val, &to->si_int); - break; - case SIL_RT: - err |= __put_user(from->si_uid, &to->si_uid); - err |= __put_user(from->si_pid, &to->si_pid); - val = (compat_int_t)from->si_int; - err |= __put_user(val, &to->si_int); - break; - case SIL_SYS: - err |= __put_user(ptr_to_compat(from->si_call_addr), &to->si_call_addr); - err |= __put_user(from->si_syscall, &to->si_syscall); - err |= __put_user(from->si_arch, &to->si_arch); - break; - } - } - return err; -} diff --git a/arch/parisc/kernel/signal32.h b/arch/parisc/kernel/signal32.h index d25858e4db63..a271dc0976ce 100644 --- a/arch/parisc/kernel/signal32.h +++ b/arch/parisc/kernel/signal32.h @@ -34,8 +34,6 @@ struct compat_ucontext { /* ELF32 signal handling */ -int copy_siginfo_to_user32 (compat_siginfo_t __user *to, const siginfo_t *from); - /* In a deft move of uber-hackery, we decide to carry the top half of all * 64-bit registers in a non-portable, non-ABI, hidden structure. * Userspace can read the hidden structure if it *wants* but is never diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h index 8a2363221b0c..62168e1158f1 100644 --- a/arch/powerpc/include/asm/compat.h +++ b/arch/powerpc/include/asm/compat.h @@ -119,8 +119,6 @@ typedef u32 compat_old_sigset_t; typedef u32 compat_sigset_word; -#define SI_PAD_SIZE32 (128/sizeof(int) - 3) - #define COMPAT_OFF_T_MAX 0x7fffffff /* diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c index ee62ff7b296c..aded81169648 100644 --- a/arch/powerpc/kernel/signal_32.c +++ b/arch/powerpc/kernel/signal_32.c @@ -873,63 +873,6 @@ static long restore_tm_user_regs(struct pt_regs *regs, #endif #ifdef CONFIG_PPC64 -int copy_siginfo_to_user32(struct compat_siginfo __user *d, const siginfo_t *s) -{ - int err; - - if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) - return -EFAULT; - - /* If you change siginfo_t structure, please be sure - * this code is fixed accordingly. - * It should never copy any pad contained in the structure - * to avoid security leaks, but must copy the generic - * 3 ints plus the relevant union member. - * This routine must convert siginfo from 64bit to 32bit as well - * at the same time. - */ - err = __put_user(s->si_signo, &d->si_signo); - err |= __put_user(s->si_errno, &d->si_errno); - err |= __put_user(s->si_code, &d->si_code); - if (s->si_code < 0) - err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, - SI_PAD_SIZE32); - else switch(siginfo_layout(s->si_signo, s->si_code)) { - case SIL_CHLD: - err |= __put_user(s->si_pid, &d->si_pid); - err |= __put_user(s->si_uid, &d->si_uid); - err |= __put_user(s->si_utime, &d->si_utime); - err |= __put_user(s->si_stime, &d->si_stime); - err |= __put_user(s->si_status, &d->si_status); - break; - case SIL_FAULT: - err |= __put_user((unsigned int)(unsigned long)s->si_addr, - &d->si_addr); - break; - case SIL_POLL: - err |= __put_user(s->si_band, &d->si_band); - err |= __put_user(s->si_fd, &d->si_fd); - break; - case SIL_TIMER: - err |= __put_user(s->si_tid, &d->si_tid); - err |= __put_user(s->si_overrun, &d->si_overrun); - err |= __put_user(s->si_int, &d->si_int); - break; - case SIL_SYS: - err |= __put_user(ptr_to_compat(s->si_call_addr), &d->si_call_addr); - err |= __put_user(s->si_syscall, &d->si_syscall); - err |= __put_user(s->si_arch, &d->si_arch); - break; - case SIL_RT: - err |= __put_user(s->si_int, &d->si_int); - /* fallthrough */ - case SIL_KILL: - err |= __put_user(s->si_pid, &d->si_pid); - err |= __put_user(s->si_uid, &d->si_uid); - break; - } - return err; -} #define copy_siginfo_to_user copy_siginfo_to_user32 diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c index d77ce14ffa5c..18c1eeb847b2 100644 --- a/arch/s390/kernel/compat_signal.c +++ b/arch/s390/kernel/compat_signal.c @@ -50,58 +50,6 @@ typedef struct struct ucontext32 uc; } rt_sigframe32; -int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) -{ - int err; - - /* If you change siginfo_t structure, please be sure - this code is fixed accordingly. - It should never copy any pad contained in the structure - to avoid security leaks, but must copy the generic - 3 ints plus the relevant union member. - This routine must convert siginfo from 64bit to 32bit as well - at the same time. */ - err = __put_user(from->si_signo, &to->si_signo); - err |= __put_user(from->si_errno, &to->si_errno); - err |= __put_user(from->si_code, &to->si_code); - if (from->si_code < 0) - err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); - else { - switch (siginfo_layout(from->si_signo, from->si_code)) { - case SIL_RT: - err |= __put_user(from->si_int, &to->si_int); - /* fallthrough */ - case SIL_KILL: - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - break; - case SIL_CHLD: - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - err |= __put_user(from->si_utime, &to->si_utime); - err |= __put_user(from->si_stime, &to->si_stime); - err |= __put_user(from->si_status, &to->si_status); - break; - case SIL_FAULT: - err |= __put_user((unsigned long) from->si_addr, - &to->si_addr); - break; - case SIL_POLL: - err |= __put_user(from->si_band, &to->si_band); - err |= __put_user(from->si_fd, &to->si_fd); - break; - case SIL_TIMER: - err |= __put_user(from->si_tid, &to->si_tid); - err |= __put_user(from->si_overrun, &to->si_overrun); - err |= __put_user(from->si_int, &to->si_int); - break; - default: - break; - } - } - return err ? -EFAULT : 0; -} - /* Store registers needed to create the signal frame */ static void store_sigregs(void) { diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h index c3688ae98b90..615283e16f22 100644 --- a/arch/sparc/include/asm/compat.h +++ b/arch/sparc/include/asm/compat.h @@ -149,8 +149,6 @@ typedef u32 compat_old_sigset_t; typedef u32 compat_sigset_word; -#define SI_PAD_SIZE32 (128/sizeof(int) - 3) - #define COMPAT_OFF_T_MAX 0x7fffffff /* diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c index 8022bb4c65a5..44d379db3f64 100644 --- a/arch/sparc/kernel/signal32.c +++ b/arch/sparc/kernel/signal32.c @@ -70,59 +70,6 @@ struct rt_signal_frame32 { /* __siginfo_rwin_t * */u32 rwin_save; } __attribute__((aligned(8))); -int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) -{ - int err; - - if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) - return -EFAULT; - - /* If you change siginfo_t structure, please be sure - this code is fixed accordingly. - It should never copy any pad contained in the structure - to avoid security leaks, but must copy the generic - 3 ints plus the relevant union member. - This routine must convert siginfo from 64bit to 32bit as well - at the same time. */ - err = __put_user(from->si_signo, &to->si_signo); - err |= __put_user(from->si_errno, &to->si_errno); - err |= __put_user(from->si_code, &to->si_code); - if (from->si_code < 0) - err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); - else { - switch (siginfo_layout(from->si_signo, from->si_code)) { - case SIL_TIMER: - err |= __put_user(from->si_tid, &to->si_tid); - err |= __put_user(from->si_overrun, &to->si_overrun); - err |= __put_user(from->si_int, &to->si_int); - break; - case SIL_CHLD: - err |= __put_user(from->si_utime, &to->si_utime); - err |= __put_user(from->si_stime, &to->si_stime); - err |= __put_user(from->si_status, &to->si_status); - default: - case SIL_KILL: - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - break; - case SIL_FAULT: - err |= __put_user(from->si_trapno, &to->si_trapno); - err |= __put_user((unsigned long)from->si_addr, &to->si_addr); - break; - case SIL_POLL: - err |= __put_user(from->si_band, &to->si_band); - err |= __put_user(from->si_fd, &to->si_fd); - break; - case SIL_RT: - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - err |= __put_user(from->si_int, &to->si_int); - break; - } - } - return err; -} - /* Checks if the fp is valid. We always build signal frames which are * 16-byte aligned, therefore we can always enforce that the restore * frame has that property as well. diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h index c6b7613256b4..769ff6ac0bf5 100644 --- a/arch/tile/include/asm/compat.h +++ b/arch/tile/include/asm/compat.h @@ -110,8 +110,6 @@ struct compat_flock64 { typedef u32 compat_sigset_word; -#define COMPAT_SI_PAD_SIZE (128/sizeof(int) - 3) - #define COMPAT_OFF_T_MAX 0x7fffffff struct compat_ipc64_perm { diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c index 4e7f40a10eb3..a703bd0e0488 100644 --- a/arch/tile/kernel/compat_signal.c +++ b/arch/tile/kernel/compat_signal.c @@ -50,61 +50,6 @@ struct compat_rt_sigframe { struct compat_ucontext uc; }; -int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from) -{ - int err; - - if (!access_ok(VERIFY_WRITE, to, sizeof(struct compat_siginfo))) - return -EFAULT; - - /* If you change siginfo_t structure, please make sure that - this code is fixed accordingly. - It should never copy any pad contained in the structure - to avoid security leaks, but must copy the generic - 3 ints plus the relevant union member. */ - err = __put_user(from->si_signo, &to->si_signo); - err |= __put_user(from->si_errno, &to->si_errno); - err |= __put_user(from->si_code, &to->si_code); - - if (from->si_code < 0) { - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_uid, &to->si_uid); - err |= __put_user(from->si_int, &to->si_int); - } else { - /* - * First 32bits of unions are always present: - * si_pid === si_band === si_tid === si_addr(LS half) - */ - err |= __put_user(from->_sifields._pad[0], - &to->_sifields._pad[0]); - switch (siginfo_layout(from->si_signo, from->si_code)) { - case SIL_FAULT: - break; - case SIL_CHLD: - err |= __put_user(from->si_utime, &to->si_utime); - err |= __put_user(from->si_stime, &to->si_stime); - err |= __put_user(from->si_status, &to->si_status); - /* FALL THROUGH */ - default: - case SIL_KILL: - err |= __put_user(from->si_uid, &to->si_uid); - break; - case SIL_POLL: - err |= __put_user(from->si_fd, &to->si_fd); - break; - case SIL_TIMER: - err |= __put_user(from->si_overrun, &to->si_overrun); - err |= __put_user(from->si_int, &to->si_int); - break; - case SIL_RT: - err |= __put_user(from->si_uid, &to->si_uid); - err |= __put_user(from->si_int, &to->si_int); - break; - } - } - return err; -} - /* The assembly shim for this function arranges to ignore the return value. */ long compat_sys_rt_sigreturn(void) { diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h index 0b76fc91f672..e1c8dab86670 100644 --- a/arch/x86/include/asm/compat.h +++ b/arch/x86/include/asm/compat.h @@ -249,4 +249,8 @@ static inline bool in_compat_syscall(void) } #define in_compat_syscall in_compat_syscall /* override the generic impl */ +struct compat_siginfo; +int __copy_siginfo_to_user32(struct compat_siginfo __user *to, + const siginfo_t *from, bool x32_ABI); + #endif /* _ASM_X86_COMPAT_H */ diff --git a/arch/x86/include/asm/fpu/signal.h b/arch/x86/include/asm/fpu/signal.h index 4df2754ef380..44bbc39a57b3 100644 --- a/arch/x86/include/asm/fpu/signal.h +++ b/arch/x86/include/asm/fpu/signal.h @@ -20,12 +20,6 @@ int ia32_setup_frame(int sig, struct ksignal *ksig, # define ia32_setup_rt_frame __setup_rt_frame #endif -#ifdef CONFIG_COMPAT -int __copy_siginfo_to_user32(compat_siginfo_t __user *to, - const siginfo_t *from, bool x32_ABI); -#endif - - extern void convert_from_fxsr(struct user_i387_ia32_struct *env, struct task_struct *tsk); extern void convert_to_fxsr(struct task_struct *tsk, diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c index 59148de2d83f..ac057f9b0763 100644 --- a/arch/x86/kernel/signal_compat.c +++ b/arch/x86/kernel/signal_compat.c @@ -98,6 +98,8 @@ static inline void signal_compat_build_tests(void) void sigaction_compat_abi(struct k_sigaction *act, struct k_sigaction *oact) { + signal_compat_build_tests(); + /* Don't leak in-kernel non-uapi flags to user-space */ if (oact) oact->sa.sa_flags &= ~(SA_IA32_ABI | SA_X32_ABI); @@ -113,97 +115,3 @@ void sigaction_compat_abi(struct k_sigaction *act, struct k_sigaction *oact) if (in_x32_syscall()) act->sa.sa_flags |= SA_X32_ABI; } - -int __copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from, - bool x32_ABI) -{ - int err = 0; - - signal_compat_build_tests(); - - if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) - return -EFAULT; - - put_user_try { - /* If you change siginfo_t structure, please make sure that - this code is fixed accordingly. - It should never copy any pad contained in the structure - to avoid security leaks, but must copy the generic - 3 ints plus the relevant union member. */ - put_user_ex(from->si_signo, &to->si_signo); - put_user_ex(from->si_errno, &to->si_errno); - put_user_ex(from->si_code, &to->si_code); - - if (from->si_code < 0) { - put_user_ex(from->si_pid, &to->si_pid); - put_user_ex(from->si_uid, &to->si_uid); - put_user_ex(ptr_to_compat(from->si_ptr), &to->si_ptr); - } else { - /* - * First 32bits of unions are always present: - * si_pid === si_band === si_tid === si_addr(LS half) - */ - put_user_ex(from->_sifields._pad[0], - &to->_sifields._pad[0]); - switch (siginfo_layout(from->si_signo, from->si_code)) { - case SIL_FAULT: - if (from->si_signo == SIGBUS && - (from->si_code == BUS_MCEERR_AR || - from->si_code == BUS_MCEERR_AO)) - put_user_ex(from->si_addr_lsb, &to->si_addr_lsb); - - if (from->si_signo == SIGSEGV) { - if (from->si_code == SEGV_BNDERR) { - compat_uptr_t lower = (unsigned long)from->si_lower; - compat_uptr_t upper = (unsigned long)from->si_upper; - put_user_ex(lower, &to->si_lower); - put_user_ex(upper, &to->si_upper); - } - if (from->si_code == SEGV_PKUERR) - put_user_ex(from->si_pkey, &to->si_pkey); - } - break; - case SIL_SYS: - put_user_ex(from->si_syscall, &to->si_syscall); - put_user_ex(from->si_arch, &to->si_arch); - break; - case SIL_CHLD: - if (!x32_ABI) { - put_user_ex(from->si_utime, &to->si_utime); - put_user_ex(from->si_stime, &to->si_stime); -#ifdef CONFIG_X86_X32_ABI - } else { - put_user_ex(from->si_utime, &to->_sifields._sigchld_x32._utime); - put_user_ex(from->si_stime, &to->_sifields._sigchld_x32._stime); -#endif - } - put_user_ex(from->si_status, &to->si_status); - /* FALL THROUGH */ - case SIL_KILL: - put_user_ex(from->si_uid, &to->si_uid); - break; - case SIL_POLL: - put_user_ex(from->si_fd, &to->si_fd); - break; - case SIL_TIMER: - put_user_ex(from->si_overrun, &to->si_overrun); - put_user_ex(ptr_to_compat(from->si_ptr), - &to->si_ptr); - break; - case SIL_RT: - put_user_ex(from->si_uid, &to->si_uid); - put_user_ex(from->si_int, &to->si_int); - break; - } - } - } put_user_catch(err); - - return err; -} - -/* from syscall's path, where we know the ABI */ -int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) -{ - return __copy_siginfo_to_user32(to, from, in_x32_syscall()); -} - diff --git a/kernel/signal.c b/kernel/signal.c index bebe44265b8b..4976f05aa09b 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -2815,6 +2815,96 @@ int copy_siginfo_to_user(siginfo_t __user *to, const siginfo_t *from) } #ifdef CONFIG_COMPAT +int copy_siginfo_to_user32(struct compat_siginfo __user *to, + const struct siginfo *from) +#if defined(CONFIG_X86_X32_ABI) || defined(CONFIG_IA32_EMULATION) +{ + return __copy_siginfo_to_user32(to, from, in_x32_syscall()); +} +int __copy_siginfo_to_user32(struct compat_siginfo __user *to, + const struct siginfo *from, bool x32_ABI) +#endif +{ + struct compat_siginfo new; + memset(&new, 0, sizeof(new)); + + new.si_signo = from->si_signo; + new.si_errno = from->si_errno; + new.si_code = from->si_code; + switch(siginfo_layout(from->si_signo, from->si_code)) { + case SIL_KILL: + new.si_pid = from->si_pid; + new.si_uid = from->si_uid; + break; + case SIL_TIMER: + new.si_tid = from->si_tid; + new.si_overrun = from->si_overrun; + new.si_int = from->si_int; + break; + case SIL_POLL: + new.si_band = from->si_band; + new.si_fd = from->si_fd; + break; + case SIL_FAULT: + new.si_addr = ptr_to_compat(from->si_addr); +#ifdef __ARCH_SI_TRAPNO + new.si_trapno = from->si_trapno; +#endif +#ifdef BUS_MCEERR_AR + if ((from->si_signo == SIGBUS) && (from->si_code == BUS_MCEERR_AR)) + new.si_addr_lsb = from->si_addr_lsb; +#endif +#ifdef BUS_MCEERR_AO + if ((from->si_signo == SIGBUS) && (from->si_code == BUS_MCEERR_AO)) + new.si_addr_lsb = from->si_addr_lsb; +#endif +#ifdef SEGV_BNDERR + if ((from->si_signo == SIGSEGV) && + (from->si_code == SEGV_BNDERR)) { + new.si_lower = ptr_to_compat(from->si_lower); + new.si_upper = ptr_to_compat(from->si_upper); + } +#endif +#ifdef SEGV_PKUERR + if ((from->si_signo == SIGSEGV) && + (from->si_code == SEGV_PKUERR)) + new.si_pkey = from->si_pkey; +#endif + + break; + case SIL_CHLD: + new.si_pid = from->si_pid; + new.si_uid = from->si_uid; + new.si_status = from->si_status; +#ifdef CONFIG_X86_X32_ABI + if (x32_ABI) { + new._sifields._sigchld_x32._utime = from->si_utime; + new._sifields._sigchld_x32._stime = from->si_stime; + } else +#endif + { + new.si_utime = from->si_utime; + new.si_stime = from->si_stime; + } + break; + case SIL_RT: + new.si_pid = from->si_pid; + new.si_uid = from->si_uid; + new.si_int = from->si_int; + break; + case SIL_SYS: + new.si_call_addr = ptr_to_compat(from->si_call_addr); + new.si_syscall = from->si_syscall; + new.si_arch = from->si_arch; + break; + } + + if (copy_to_user(to, &new, sizeof(struct compat_siginfo))) + return -EFAULT; + + return 0; +} + int copy_siginfo_from_user32(struct siginfo *to, const struct compat_siginfo __user *ufrom) { -- cgit v1.2.3 From 47355040d2760566901057287b35d5f10e217e12 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Tue, 16 Jan 2018 16:12:38 -0600 Subject: signal/powerpc: Remove unnecessary signal_code parameter of do_send_trap signal_code is always TRAP_HWBKPT Signed-off-by: "Eric W. Biederman" --- arch/powerpc/include/asm/debug.h | 2 +- arch/powerpc/kernel/process.c | 6 +++--- arch/powerpc/kernel/traps.c | 12 ++++++------ 3 files changed, 10 insertions(+), 10 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/debug.h b/arch/powerpc/include/asm/debug.h index 14e71ff6579e..fc97404de0a3 100644 --- a/arch/powerpc/include/asm/debug.h +++ b/arch/powerpc/include/asm/debug.h @@ -49,7 +49,7 @@ void set_breakpoint(struct arch_hw_breakpoint *brk); void __set_breakpoint(struct arch_hw_breakpoint *brk); #ifdef CONFIG_PPC_ADV_DEBUG_REGS extern void do_send_trap(struct pt_regs *regs, unsigned long address, - unsigned long error_code, int signal_code, int brkpt); + unsigned long error_code, int brkpt); #else extern void do_break(struct pt_regs *regs, unsigned long address, diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 72be0c32e902..bfb48cf56bc3 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -601,11 +601,11 @@ EXPORT_SYMBOL(flush_all_to_thread); #ifdef CONFIG_PPC_ADV_DEBUG_REGS void do_send_trap(struct pt_regs *regs, unsigned long address, - unsigned long error_code, int signal_code, int breakpt) + unsigned long error_code, int breakpt) { siginfo_t info; - current->thread.trap_nr = signal_code; + current->thread.trap_nr = TRAP_HWBKPT; if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, 11, SIGSEGV) == NOTIFY_STOP) return; @@ -613,7 +613,7 @@ void do_send_trap(struct pt_regs *regs, unsigned long address, /* Deliver the signal to userspace */ info.si_signo = SIGTRAP; info.si_errno = breakpt; /* breakpoint or watchpoint id */ - info.si_code = signal_code; + info.si_code = TRAP_HWBKPT; info.si_addr = (void __user *)address; force_sig_info(SIGTRAP, &info, current); } diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index f2e6e1838952..c93f1e6a9fff 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -1750,34 +1750,34 @@ static void handle_debug(struct pt_regs *regs, unsigned long debug_status) #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE current->thread.debug.dbcr2 &= ~DBCR2_DAC12MODE; #endif - do_send_trap(regs, mfspr(SPRN_DAC1), debug_status, TRAP_HWBKPT, + do_send_trap(regs, mfspr(SPRN_DAC1), debug_status, 5); changed |= 0x01; } else if (debug_status & (DBSR_DAC2R | DBSR_DAC2W)) { dbcr_dac(current) &= ~(DBCR_DAC2R | DBCR_DAC2W); - do_send_trap(regs, mfspr(SPRN_DAC2), debug_status, TRAP_HWBKPT, + do_send_trap(regs, mfspr(SPRN_DAC2), debug_status, 6); changed |= 0x01; } else if (debug_status & DBSR_IAC1) { current->thread.debug.dbcr0 &= ~DBCR0_IAC1; dbcr_iac_range(current) &= ~DBCR_IAC12MODE; - do_send_trap(regs, mfspr(SPRN_IAC1), debug_status, TRAP_HWBKPT, + do_send_trap(regs, mfspr(SPRN_IAC1), debug_status, 1); changed |= 0x01; } else if (debug_status & DBSR_IAC2) { current->thread.debug.dbcr0 &= ~DBCR0_IAC2; - do_send_trap(regs, mfspr(SPRN_IAC2), debug_status, TRAP_HWBKPT, + do_send_trap(regs, mfspr(SPRN_IAC2), debug_status, 2); changed |= 0x01; } else if (debug_status & DBSR_IAC3) { current->thread.debug.dbcr0 &= ~DBCR0_IAC3; dbcr_iac_range(current) &= ~DBCR_IAC34MODE; - do_send_trap(regs, mfspr(SPRN_IAC3), debug_status, TRAP_HWBKPT, + do_send_trap(regs, mfspr(SPRN_IAC3), debug_status, 3); changed |= 0x01; } else if (debug_status & DBSR_IAC4) { current->thread.debug.dbcr0 &= ~DBCR0_IAC4; - do_send_trap(regs, mfspr(SPRN_IAC4), debug_status, TRAP_HWBKPT, + do_send_trap(regs, mfspr(SPRN_IAC4), debug_status, 4); changed |= 0x01; } -- cgit v1.2.3 From f71dd7dc2dc989dc712b246a74d243e4b2c5f8a7 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 22 Jan 2018 14:37:25 -0600 Subject: signal/ptrace: Add force_sig_ptrace_errno_trap and use it where needed There are so many places that build struct siginfo by hand that at least one of them is bound to get it wrong. A handful of cases in the kernel arguably did just that when using the errno field of siginfo to pass no errno values to userspace. The usage is limited to a single si_code so at least does not mess up anything else. Encapsulate this questionable pattern in a helper function so that the userspace ABI is preserved. Update all of the places that use this pattern to use the new helper function. Signed-off-by: "Eric W. Biederman" --- arch/arm/kernel/ptrace.c | 8 +------- arch/arm64/kernel/ptrace.c | 6 ++++-- arch/powerpc/kernel/process.c | 9 ++------- arch/xtensa/kernel/ptrace.c | 8 +------- include/linux/sched/signal.h | 2 ++ kernel/signal.c | 15 +++++++++++++++ 6 files changed, 25 insertions(+), 23 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index 58e3771e4c5b..7724b0f661b3 100644 --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -390,7 +390,6 @@ static void ptrace_hbptriggered(struct perf_event *bp, struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp); long num; int i; - siginfo_t info; for (i = 0; i < ARM_MAX_HBP_SLOTS; ++i) if (current->thread.debug.hbp[i] == bp) @@ -398,12 +397,7 @@ static void ptrace_hbptriggered(struct perf_event *bp, num = (i == ARM_MAX_HBP_SLOTS) ? 0 : ptrace_hbp_idx_to_num(i); - info.si_signo = SIGTRAP; - info.si_errno = (int)num; - info.si_code = TRAP_HWBKPT; - info.si_addr = (void __user *)(bkpt->trigger); - - force_sig_info(SIGTRAP, &info, current); + force_sig_ptrace_errno_trap((int)num, (void __user *)(bkpt->trigger)); } /* diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 95daa1478a7c..6618036ae6d4 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -190,21 +190,23 @@ static void ptrace_hbptriggered(struct perf_event *bp, #ifdef CONFIG_COMPAT if (is_compat_task()) { + int si_errno = 0; int i; for (i = 0; i < ARM_MAX_BRP; ++i) { if (current->thread.debug.hbp_break[i] == bp) { - info.si_errno = (i << 1) + 1; + si_errno = (i << 1) + 1; break; } } for (i = 0; i < ARM_MAX_WRP; ++i) { if (current->thread.debug.hbp_watch[i] == bp) { - info.si_errno = -((i << 1) + 1); + si_errno = -((i << 1) + 1); break; } } + force_sig_ptrace_errno_trap(si_errno, (void __user *)bkpt->trigger); } #endif force_sig_info(SIGTRAP, &info, current); diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index bfb48cf56bc3..4208cbe2fb7f 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -603,19 +603,14 @@ EXPORT_SYMBOL(flush_all_to_thread); void do_send_trap(struct pt_regs *regs, unsigned long address, unsigned long error_code, int breakpt) { - siginfo_t info; - current->thread.trap_nr = TRAP_HWBKPT; if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, 11, SIGSEGV) == NOTIFY_STOP) return; /* Deliver the signal to userspace */ - info.si_signo = SIGTRAP; - info.si_errno = breakpt; /* breakpoint or watchpoint id */ - info.si_code = TRAP_HWBKPT; - info.si_addr = (void __user *)address; - force_sig_info(SIGTRAP, &info, current); + force_sig_ptrace_errno_trap(breakpt, /* breakpoint or watchpoint id */ + (void __user *)address); } #else /* !CONFIG_PPC_ADV_DEBUG_REGS */ void do_break (struct pt_regs *regs, unsigned long address, diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c index e2461968efb2..c0845cb1cbb9 100644 --- a/arch/xtensa/kernel/ptrace.c +++ b/arch/xtensa/kernel/ptrace.c @@ -278,7 +278,6 @@ static void ptrace_hbptriggered(struct perf_event *bp, struct pt_regs *regs) { int i; - siginfo_t info; struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp); if (bp->attr.bp_type & HW_BREAKPOINT_X) { @@ -293,12 +292,7 @@ static void ptrace_hbptriggered(struct perf_event *bp, i = (i << 1) | 1; } - info.si_signo = SIGTRAP; - info.si_errno = i; - info.si_code = TRAP_HWBKPT; - info.si_addr = (void __user *)bkpt->address; - - force_sig_info(SIGTRAP, &info, current); + force_sig_ptrace_errno_trap(i, (void __user *)bkpt->address); } static struct perf_event *ptrace_hbp_create(struct task_struct *tsk, int type) diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h index 944fe6356f4a..23b4f9cb82db 100644 --- a/include/linux/sched/signal.h +++ b/include/linux/sched/signal.h @@ -311,6 +311,8 @@ int send_sig_mceerr(int code, void __user *, short, struct task_struct *); int force_sig_bnderr(void __user *addr, void __user *lower, void __user *upper); int force_sig_pkuerr(void __user *addr, u32 pkey); +int force_sig_ptrace_errno_trap(int errno, void __user *addr); + extern int send_sig_info(int, struct siginfo *, struct task_struct *); extern int force_sigsegv(int, struct task_struct *); extern int force_sig_info(int, struct siginfo *, struct task_struct *); diff --git a/kernel/signal.c b/kernel/signal.c index 4f6300ef8062..e549174c0831 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1599,6 +1599,21 @@ int force_sig_pkuerr(void __user *addr, u32 pkey) } #endif +/* For the crazy architectures that include trap information in + * the errno field, instead of an actual errno value. + */ +int force_sig_ptrace_errno_trap(int errno, void __user *addr) +{ + struct siginfo info; + + clear_siginfo(&info); + info.si_signo = SIGTRAP; + info.si_errno = errno; + info.si_code = TRAP_HWBKPT; + info.si_addr = addr; + return force_sig_info(info.si_signo, &info, current); +} + int kill_pgrp(struct pid *pid, int sig, int priv) { int ret; -- cgit v1.2.3 From 83b57531c58f4173d1c0d0b2c0bc88c853c32ea5 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Sun, 9 Jul 2017 18:14:01 -0500 Subject: mm/memory_failure: Remove unused trapno from memory_failure Today 4 architectures set ARCH_SUPPORTS_MEMORY_FAILURE (arm64, parisc, powerpc, and x86), while 4 other architectures set __ARCH_SI_TRAPNO (alpha, metag, sparc, and tile). These two sets of architectures do not interesect so remove the trapno paramater to remove confusion. Signed-off-by: "Eric W. Biederman" --- arch/parisc/kernel/pdt.c | 2 +- .../powerpc/platforms/powernv/opal-memory-errors.c | 2 +- arch/x86/kernel/cpu/mcheck/mce.c | 6 ++-- drivers/acpi/apei/ghes.c | 2 +- drivers/base/memory.c | 2 +- drivers/ras/cec.c | 2 +- include/linux/mm.h | 4 +-- mm/hwpoison-inject.c | 2 +- mm/madvise.c | 2 +- mm/memory-failure.c | 33 +++++++++------------- 10 files changed, 25 insertions(+), 32 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/parisc/kernel/pdt.c b/arch/parisc/kernel/pdt.c index e07eb34c8750..36434d4da381 100644 --- a/arch/parisc/kernel/pdt.c +++ b/arch/parisc/kernel/pdt.c @@ -325,7 +325,7 @@ static int pdt_mainloop(void *unused) #ifdef CONFIG_MEMORY_FAILURE if ((pde & PDT_ADDR_PERM_ERR) || ((pde & PDT_ADDR_SINGLE_ERR) == 0)) - memory_failure(pde >> PAGE_SHIFT, 0, 0); + memory_failure(pde >> PAGE_SHIFT, 0); else soft_offline_page( pfn_to_page(pde >> PAGE_SHIFT), 0); diff --git a/arch/powerpc/platforms/powernv/opal-memory-errors.c b/arch/powerpc/platforms/powernv/opal-memory-errors.c index d9916ea62305..8ddc1accf199 100644 --- a/arch/powerpc/platforms/powernv/opal-memory-errors.c +++ b/arch/powerpc/platforms/powernv/opal-memory-errors.c @@ -60,7 +60,7 @@ static void handle_memory_error_event(struct OpalMemoryErrorData *merr_evt) } for (; paddr_start < paddr_end; paddr_start += PAGE_SIZE) { - memory_failure(paddr_start >> PAGE_SHIFT, 0, 0); + memory_failure(paddr_start >> PAGE_SHIFT, 0); } } diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index b1d616d08eee..3b7319e25168 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -582,7 +582,7 @@ static int srao_decode_notifier(struct notifier_block *nb, unsigned long val, if (mce_usable_address(mce) && (mce->severity == MCE_AO_SEVERITY)) { pfn = mce->addr >> PAGE_SHIFT; - memory_failure(pfn, MCE_VECTOR, 0); + memory_failure(pfn, 0); } return NOTIFY_OK; @@ -1046,7 +1046,7 @@ static int do_memory_failure(struct mce *m) pr_err("Uncorrected hardware memory error in user-access at %llx", m->addr); if (!(m->mcgstatus & MCG_STATUS_RIPV)) flags |= MF_MUST_KILL; - ret = memory_failure(m->addr >> PAGE_SHIFT, MCE_VECTOR, flags); + ret = memory_failure(m->addr >> PAGE_SHIFT, flags); if (ret) pr_err("Memory error not recovered"); return ret; @@ -1325,7 +1325,7 @@ out_ist: EXPORT_SYMBOL_GPL(do_machine_check); #ifndef CONFIG_MEMORY_FAILURE -int memory_failure(unsigned long pfn, int vector, int flags) +int memory_failure(unsigned long pfn, int flags) { /* mce_severity() should not hand us an ACTION_REQUIRED error */ BUG_ON(flags & MF_ACTION_REQUIRED); diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index 6402f7fad3bb..bb5f9c643e0e 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -410,7 +410,7 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int flags = 0; if (flags != -1) - memory_failure_queue(pfn, 0, flags); + memory_failure_queue(pfn, flags); #endif } diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 1d60b58a8c19..fe4b24f05f6a 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -569,7 +569,7 @@ store_hard_offline_page(struct device *dev, if (kstrtoull(buf, 0, &pfn) < 0) return -EINVAL; pfn >>= PAGE_SHIFT; - ret = memory_failure(pfn, 0, 0); + ret = memory_failure(pfn, 0); return ret ? ret : count; } diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c index ca44e6977cf2..2d9ec378a8bc 100644 --- a/drivers/ras/cec.c +++ b/drivers/ras/cec.c @@ -327,7 +327,7 @@ int cec_add_elem(u64 pfn) } else { /* We have reached max count for this page, soft-offline it. */ pr_err("Soft-offlining pfn: 0x%llx\n", pfn); - memory_failure_queue(pfn, 0, MF_SOFT_OFFLINE); + memory_failure_queue(pfn, MF_SOFT_OFFLINE); ca->pfns_poisoned++; } diff --git a/include/linux/mm.h b/include/linux/mm.h index ea818ff739cd..7fc92384977e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2570,8 +2570,8 @@ enum mf_flags { MF_MUST_KILL = 1 << 2, MF_SOFT_OFFLINE = 1 << 3, }; -extern int memory_failure(unsigned long pfn, int trapno, int flags); -extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); +extern int memory_failure(unsigned long pfn, int flags); +extern void memory_failure_queue(unsigned long pfn, int flags); extern int unpoison_memory(unsigned long pfn); extern int get_hwpoison_page(struct page *page); #define put_hwpoison_page(page) put_page(page) diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c index 356df057a2a8..b6ac70616c32 100644 --- a/mm/hwpoison-inject.c +++ b/mm/hwpoison-inject.c @@ -52,7 +52,7 @@ static int hwpoison_inject(void *data, u64 val) inject: pr_info("Injecting memory failure at pfn %#lx\n", pfn); - return memory_failure(pfn, 18, MF_COUNT_INCREASED); + return memory_failure(pfn, MF_COUNT_INCREASED); put_out: put_hwpoison_page(p); return 0; diff --git a/mm/madvise.c b/mm/madvise.c index 751e97aa2210..4d3c922ea1a1 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -661,7 +661,7 @@ static int madvise_inject_error(int behavior, pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n", page_to_pfn(page), start); - ret = memory_failure(page_to_pfn(page), 0, MF_COUNT_INCREASED); + ret = memory_failure(page_to_pfn(page), MF_COUNT_INCREASED); if (ret) return ret; } diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 4acdf393a801..c5f5f31bd979 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -178,7 +178,7 @@ EXPORT_SYMBOL_GPL(hwpoison_filter); * ``action optional'' if they are not immediately affected by the error * ``action required'' if error happened in current execution context */ -static int kill_proc(struct task_struct *t, unsigned long addr, int trapno, +static int kill_proc(struct task_struct *t, unsigned long addr, unsigned long pfn, struct page *page, int flags) { struct siginfo si; @@ -189,9 +189,6 @@ static int kill_proc(struct task_struct *t, unsigned long addr, int trapno, si.si_signo = SIGBUS; si.si_errno = 0; si.si_addr = (void *)addr; -#ifdef __ARCH_SI_TRAPNO - si.si_trapno = trapno; -#endif si.si_addr_lsb = compound_order(compound_head(page)) + PAGE_SHIFT; if ((flags & MF_ACTION_REQUIRED) && t->mm == current->mm) { @@ -323,7 +320,7 @@ static void add_to_kill(struct task_struct *tsk, struct page *p, * Also when FAIL is set do a force kill because something went * wrong earlier. */ -static void kill_procs(struct list_head *to_kill, int forcekill, int trapno, +static void kill_procs(struct list_head *to_kill, int forcekill, bool fail, struct page *page, unsigned long pfn, int flags) { @@ -348,7 +345,7 @@ static void kill_procs(struct list_head *to_kill, int forcekill, int trapno, * check for that, but we need to tell the * process anyways. */ - else if (kill_proc(tk->tsk, tk->addr, trapno, + else if (kill_proc(tk->tsk, tk->addr, pfn, page, flags) < 0) pr_err("Memory failure: %#lx: Cannot send advisory machine check signal to %s:%d\n", pfn, tk->tsk->comm, tk->tsk->pid); @@ -927,7 +924,7 @@ EXPORT_SYMBOL_GPL(get_hwpoison_page); * the pages and send SIGBUS to the processes if the data was dirty. */ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn, - int trapno, int flags, struct page **hpagep) + int flags, struct page **hpagep) { enum ttu_flags ttu = TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS; struct address_space *mapping; @@ -1017,7 +1014,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn, * any accesses to the poisoned memory. */ forcekill = PageDirty(hpage) || (flags & MF_MUST_KILL); - kill_procs(&tokill, forcekill, trapno, !unmap_success, p, pfn, flags); + kill_procs(&tokill, forcekill, !unmap_success, p, pfn, flags); return unmap_success; } @@ -1045,7 +1042,7 @@ static int identify_page_state(unsigned long pfn, struct page *p, return page_action(ps, p, pfn); } -static int memory_failure_hugetlb(unsigned long pfn, int trapno, int flags) +static int memory_failure_hugetlb(unsigned long pfn, int flags) { struct page *p = pfn_to_page(pfn); struct page *head = compound_head(p); @@ -1090,7 +1087,7 @@ static int memory_failure_hugetlb(unsigned long pfn, int trapno, int flags) return 0; } - if (!hwpoison_user_mappings(p, pfn, trapno, flags, &head)) { + if (!hwpoison_user_mappings(p, pfn, flags, &head)) { action_result(pfn, MF_MSG_UNMAP_FAILED, MF_IGNORED); res = -EBUSY; goto out; @@ -1105,7 +1102,6 @@ out: /** * memory_failure - Handle memory failure of a page. * @pfn: Page Number of the corrupted page - * @trapno: Trap number reported in the signal to user space. * @flags: fine tune action taken * * This function is called by the low level machine check code @@ -1120,7 +1116,7 @@ out: * Must run in process context (e.g. a work queue) with interrupts * enabled and no spinlocks hold. */ -int memory_failure(unsigned long pfn, int trapno, int flags) +int memory_failure(unsigned long pfn, int flags) { struct page *p; struct page *hpage; @@ -1129,7 +1125,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags) unsigned long page_flags; if (!sysctl_memory_failure_recovery) - panic("Memory failure from trap %d on page %lx", trapno, pfn); + panic("Memory failure on page %lx", pfn); if (!pfn_valid(pfn)) { pr_err("Memory failure: %#lx: memory outside kernel control\n", @@ -1139,7 +1135,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags) p = pfn_to_page(pfn); if (PageHuge(p)) - return memory_failure_hugetlb(pfn, trapno, flags); + return memory_failure_hugetlb(pfn, flags); if (TestSetPageHWPoison(p)) { pr_err("Memory failure: %#lx: already hardware poisoned\n", pfn); @@ -1268,7 +1264,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags) * When the raw error page is thp tail page, hpage points to the raw * page after thp split. */ - if (!hwpoison_user_mappings(p, pfn, trapno, flags, &hpage)) { + if (!hwpoison_user_mappings(p, pfn, flags, &hpage)) { action_result(pfn, MF_MSG_UNMAP_FAILED, MF_IGNORED); res = -EBUSY; goto out; @@ -1296,7 +1292,6 @@ EXPORT_SYMBOL_GPL(memory_failure); struct memory_failure_entry { unsigned long pfn; - int trapno; int flags; }; @@ -1312,7 +1307,6 @@ static DEFINE_PER_CPU(struct memory_failure_cpu, memory_failure_cpu); /** * memory_failure_queue - Schedule handling memory failure of a page. * @pfn: Page Number of the corrupted page - * @trapno: Trap number reported in the signal to user space. * @flags: Flags for memory failure handling * * This function is called by the low level hardware error handler @@ -1326,13 +1320,12 @@ static DEFINE_PER_CPU(struct memory_failure_cpu, memory_failure_cpu); * * Can run in IRQ context. */ -void memory_failure_queue(unsigned long pfn, int trapno, int flags) +void memory_failure_queue(unsigned long pfn, int flags) { struct memory_failure_cpu *mf_cpu; unsigned long proc_flags; struct memory_failure_entry entry = { .pfn = pfn, - .trapno = trapno, .flags = flags, }; @@ -1365,7 +1358,7 @@ static void memory_failure_work_func(struct work_struct *work) if (entry.flags & MF_SOFT_OFFLINE) soft_offline_page(pfn_to_page(entry.pfn), entry.flags); else - memory_failure(entry.pfn, entry.trapno, entry.flags); + memory_failure(entry.pfn, entry.flags); } } -- cgit v1.2.3