kernel/linux.git/arch/x86/include/asm/syscall_wrapper.h, branch v5.10.258

x86/entry/ia32: Ensure s32 is sign extended to s64

2024-02-23T07:42:01+00:00

commit 56062d60f117dccfb5281869e0ab61e090baf864 upstream. Presently ia32 registers stored in ptregs are unconditionally cast to unsigned int by the ia32 stub. They are then cast to long when passed to __se_sys*, but will not be sign extended. This takes the sign of the syscall argument into account in the ia32 stub. It still casts to unsigned int to avoid implementation specific behavior. However then casts to int or unsigned int as necessary. So that the following cast to long sign extends the value. This fixes the io_pgetevents02 LTP test when compiled with -m32. Presently the systemcall io_pgetevents_time64() unexpectedly accepts -1 for the maximum number of events. It doesn't appear other systemcalls with signed arguments are effected because they all have compat variants defined and wired up. Fixes: ebeb8c82ffaf ("syscalls/x86: Use 'struct pt_regs' based syscall calling for IA32_EMULATION and x32") Suggested-by: Arnd Bergmann Signed-off-by: Richard Palethorpe Signed-off-by: Nikolay Borisov Signed-off-by: Thomas Gleixner Reviewed-by: Arnd Bergmann Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240110130122.3836513-1-nik.borisov@suse.com Link: https://lore.kernel.org/ltp/20210921130127.24131-1-rpalethorpe@suse.com/ Signed-off-by: Greg Kroah-Hartman

x86/entry: Fix build error x86 with !CONFIG_POSIX_TIMERS

2020-03-25T09:06:20+00:00

Add missing semicolon. Fixes: a74d187c2df3 ("x86/entry: Refactor SYS_NI macros") Reported-by: Ingo Molnar Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Link: https://lkml.kernel.org/r/20200324143520.898733-1-brgerst@gmail.com

x86/entry: Drop asmlinkage from syscalls

2020-03-21T15:03:25+00:00

asmlinkage is no longer required since the syscall ABI is now fully under x86 architecture control. This makes the 32-bit native syscalls a bit more effecient by passing in regs via EAX instead of on the stack. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Reviewed-by: Andy Lutomirski Link: https://lkml.kernel.org/r/20200313195144.164260-18-brgerst@gmail.com

x86/entry/32: Enable pt_regs based syscalls

2020-03-21T15:03:24+00:00

Enable pt_regs based syscalls for 32-bit. This makes the 32-bit native kernel consistent with the 64-bit kernel, and improves the syscall interface by not needing to push all 6 potential arguments onto the stack. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Link: https://lkml.kernel.org/r/20200313195144.164260-17-brgerst@gmail.com

x86/entry/64: Move sys_ni_syscall stub to common.c

2020-03-21T15:03:20+00:00

so it can be available to multiple syscall tables. Also directly return -ENOSYS instead of bouncing to the generic sys_ni_syscall(). Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Link: https://lkml.kernel.org/r/20200313195144.164260-7-brgerst@gmail.com

x86/entry: Refactor SYS_NI macros

2020-03-21T15:03:20+00:00

Pull the common code out from the SYS_NI macros into a new __SYS_NI macro. Also conditionalize the X64 version in preparation for enabling syscall wrappers on 32-bit native kernels. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Reviewed-by: Andy Lutomirski Link: https://lkml.kernel.org/r/20200313195144.164260-5-brgerst@gmail.com

x86/entry: Refactor COND_SYSCALL macros

2020-03-21T15:03:19+00:00

Pull the common code out from the COND_SYSCALL macros into a new __COND_SYSCALL macro. Also conditionalize the X64 version in preparation for enabling syscall wrappers on 32-bit native kernels. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Reviewed-by: Andy Lutomirski Link: https://lkml.kernel.org/r/20200313195144.164260-4-brgerst@gmail.com

x86/entry: Refactor SYSCALL_DEFINE0 macros

2020-03-21T15:03:19+00:00

Pull the common code out from the SYSCALL_DEFINE0 macros into a new __SYS_STUB0 macro. Also conditionalize the X64 version in preparation for enabling syscall wrappers on 32-bit native kernels. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Reviewed-by: Andy Lutomirski Link: https://lkml.kernel.org/r/20200313195144.164260-3-brgerst@gmail.com

x86/entry: Refactor SYSCALL_DEFINEx macros

2020-03-21T15:03:18+00:00

Pull the common code out from the SYSCALL_DEFINEx macros into a new __SYS_STUBx macro. Also conditionalize the X64 version in preparation for enabling syscall wrappers on 32-bit native kernels. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Reviewed-by: Andy Lutomirski Link: https://lkml.kernel.org/r/20200313195144.164260-2-brgerst@gmail.com

syscalls/x86: Fix function types in COND_SYSCALL

2019-10-11T10:49:19+00:00

Define a weak function in COND_SYSCALL instead of a weak alias to sys_ni_syscall(), which has an incompatible type. This fixes indirect call mismatches with Control-Flow Integrity (CFI) checking. Signed-off-by: Sami Tolvanen Acked-by: Andy Lutomirski Cc: Borislav Petkov Cc: H . Peter Anvin Cc: Kees Cook Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: https://lkml.kernel.org/r/20191008224049.115427-6-samitolvanen@google.com Signed-off-by: Ingo Molnar