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| author | Eric W. Biederman <ebiederm@xmission.com> | 2018-04-17 23:26:37 +0300 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-04-25 18:40:51 +0300 |
| commit | 3eb0f5193b497083391aa05d35210d5645211eef (patch) | |
| tree | 65f009d4cdd5e407741a4431c0aacd40452779bd /arch/arm64/kernel | |
| parent | f6ed1ecad56fec7ab5c6bf741064b95801e9688f (diff) | |
| download | linux-3eb0f5193b497083391aa05d35210d5645211eef.tar.xz | |
signal: Ensure every siginfo we send has all bits initialized
Call clear_siginfo to ensure every stack allocated siginfo is properly
initialized before being passed to the signal sending functions.
Note: It is not safe to depend on C initializers to initialize struct
siginfo on the stack because C is allowed to skip holes when
initializing a structure.
The initialization of struct siginfo in tracehook_report_syscall_exit
was moved from the helper user_single_step_siginfo into
tracehook_report_syscall_exit itself, to make it clear that the local
variable siginfo gets fully initialized.
In a few cases the scope of struct siginfo has been reduced to make it
clear that siginfo siginfo is not used on other paths in the function
in which it is declared.
Instances of using memset to initialize siginfo have been replaced
with calls clear_siginfo for clarity.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/fpsimd.c | 2 | ||||
| -rw-r--r-- | arch/arm64/kernel/sys_compat.c | 1 | ||||
| -rw-r--r-- | arch/arm64/kernel/traps.c | 1 |
3 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index 87a35364e750..4bcdd0318729 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -882,7 +882,7 @@ asmlinkage void do_fpsimd_exc(unsigned int esr, struct pt_regs *regs) si_code = FPE_FLTRES; } - memset(&info, 0, sizeof(info)); + clear_siginfo(&info); info.si_signo = SIGFPE; info.si_code = si_code; info.si_addr = (void __user *)instruction_pointer(regs); diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c index 93ab57dcfc14..a6109825eeb9 100644 --- a/arch/arm64/kernel/sys_compat.c +++ b/arch/arm64/kernel/sys_compat.c @@ -112,6 +112,7 @@ long compat_arm_syscall(struct pt_regs *regs) break; } + clear_siginfo(&info); info.si_signo = SIGILL; info.si_errno = 0; info.si_code = ILL_ILLTRP; diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index ba964da31a25..7f476586cacc 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -634,6 +634,7 @@ asmlinkage void bad_el0_sync(struct pt_regs *regs, int reason, unsigned int esr) siginfo_t info; void __user *pc = (void __user *)instruction_pointer(regs); + clear_siginfo(&info); info.si_signo = SIGILL; info.si_errno = 0; info.si_code = ILL_ILLOPC; |