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arm64: signal: don't force known signals to SIGKILL 

Since commit:

  a7e6f1ca90 ("arm64: signal: Force SIGKILL for unknown signals in force_signal_inject")

... any signal which is not SIGKILL will be upgraded to a SIGKILL be
force_signal_inject(). This includes signals we do expect, such as
SIGILL triggered by do_undefinstr().

Fix the check to use a logical AND rather than a logical OR, permitting
signals whose layout is SIL_FAULT.

Fixes: a7e6f1ca90 ("arm64: signal: Force SIGKILL for unknown signals in force_signal_inject")
Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Rutland 2018-04-16 16:45:01 +01:00 committed by Catalin Marinas
parent 800cb2e553
commit b2d71b3cda
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/traps.c
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@ -366,7 +366,7 @@ void force_signal_inject(int signal, int code, unsigned long address)
}
/* Force signals we don't understand to SIGKILL */
if (WARN_ON(signal != SIGKILL ||
if (WARN_ON(signal != SIGKILL &&
siginfo_layout(signal, code) != SIL_FAULT)) {
signal = SIGKILL;
}