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arm64: signal: Force SIGKILL for unknown signals in force_signal_inject 

For signals other than SIGKILL or those with siginfo_layout(signal, code)
== SIL_FAULT then force_signal_inject does not initialise the siginfo_t
properly. Since the signal number is determined solely by the caller,
simply WARN on unknown signals and force to SIGKILL.

Reported-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2018-02-20 18:08:40 +00:00
parent 2c9120f3a8
commit a7e6f1ca90
1 changed files with 6 additions and 0 deletions
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6
arch/arm64/kernel/traps.c
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@ -331,6 +331,12 @@ void force_signal_inject(int signal, int code, unsigned long address)
break; break;
} }
/* Force signals we don't understand to SIGKILL */
if (WARN_ON(signal != SIGKILL ||
siginfo_layout(signal, code) != SIL_FAULT)) {
signal = SIGKILL;
}
if (unhandled_signal(current, signal) && if (unhandled_signal(current, signal) &&
show_unhandled_signals_ratelimited()) { show_unhandled_signals_ratelimited()) {
pr_info("%s[%d]: %s: pc=%08llx\n", pr_info("%s[%d]: %s: pc=%08llx\n",