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Check if a fatal signal is from kernel

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On Linux, `siginfo_t` uses a union for each `si_code`, and the field
corresponding to `si_pid` does not belong to the `_sigfault` field for
SIGSEGV.  It actually overlaps the `si_addr` field, which is usually
non-zero on stack overflow.

https://github.com/ruby/ruby/pull/10201#issuecomment-2034723244
This commit is contained in:
Nobuyoshi Nakada 2024-04-03 23:14:52 +09:00
parent 4960a598d6
commit f928e60d41
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1 changed files with 5 additions and 2 deletions
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7
signal.c
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@ -867,16 +867,19 @@ check_stack_overflow(int sig, const void *addr)
}
}
# endif
# ifdef _WIN32
# define CHECK_STACK_OVERFLOW() check_stack_overflow(sig, 0)
# else
# define FAULT_ADDRESS info->si_addr
# ifdef USE_UCONTEXT_REG
# define CHECK_STACK_OVERFLOW() (info->si_pid ? (void)0 : check_stack_overflow(sig, (uintptr_t)FAULT_ADDRESS, ctx))
# define CHECK_STACK_OVERFLOW_() check_stack_overflow(sig, (uintptr_t)FAULT_ADDRESS, ctx)
# else
# define CHECK_STACK_OVERFLOW() (info->si_pid ? (void)0 : check_stack_overflow(sig, FAULT_ADDRESS))
# define CHECK_STACK_OVERFLOW_() check_stack_overflow(sig, FAULT_ADDRESS)
# endif
# define MESSAGE_FAULT_ADDRESS " at %p", FAULT_ADDRESS
# define SIGNAL_FROM_USER_P() ((info)->si_code == SI_USER)
# define CHECK_STACK_OVERFLOW() (SIGNAL_FROM_USER_P() ? (void)0 : CHECK_STACK_OVERFLOW_())
# endif
#else
# define CHECK_STACK_OVERFLOW() (void)0