diff options
| author |   Eric W. Biederman <ebiederm@xmission.com> | 2018-04-17 15:26:37 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-04-25 10:40:51 -0500 |
| commit | 3eb0f5193b497083391aa05d35210d5645211eef (patch) | |
| tree | 65f009d4cdd5e407741a4431c0aacd40452779bd /arch/xtensa | |
| parent | signal/nds32: Use force_sig(SIGILL) in do_revisn (diff) | |
| download | linux-dev-3eb0f5193b497083391aa05d35210d5645211eef.tar.xz linux-dev-3eb0f5193b497083391aa05d35210d5645211eef.zip | |
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/xtensa')
| -rw-r--r-- | arch/xtensa/kernel/traps.c | 1 | ||||
| -rw-r--r-- | arch/xtensa/mm/fault.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index 32c5207f1226..51771929f341 100644 --- a/arch/xtensa/kernel/traps.c +++ b/arch/xtensa/kernel/traps.c @@ -334,6 +334,7 @@ do_unaligned_user (struct pt_regs *regs) "(pid = %d, pc = %#010lx)\n", regs->excvaddr, current->comm, task_pid_nr(current), regs->pc); + clear_siginfo(&info); info.si_signo = SIGBUS; info.si_errno = 0; info.si_code = BUS_ADRALN; diff --git a/arch/xtensa/mm/fault.c b/arch/xtensa/mm/fault.c index 8b9b6f44bb06..f9323a3e61ce 100644 --- a/arch/xtensa/mm/fault.c +++ b/arch/xtensa/mm/fault.c @@ -45,6 +45,7 @@ void do_page_fault(struct pt_regs *regs) int fault; unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + clear_siginfo(&info); info.si_code = SEGV_MAPERR; /* We fault-in kernel-space virtual memory on-demand. The |