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x86/pkeys/selftests: Fix protection keys write() warning

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write() is marked as having a must-check return value.  Check it and
abort if we fail to write an error message from a signal handler.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20171111001232.94813E58@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dave Hansen 2017-11-10 16:12:32 -08:00 committed by Ingo Molnar
parent 91c49c2deb
commit 7b659ee3e1
1 changed files with 4 additions and 1 deletions
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5
tools/testing/selftests/x86/pkey-helpers.h
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@ -30,6 +30,7 @@ static inline void sigsafe_printf(const char *format, ...)
if (!dprint_in_signal) {
vprintf(format, ap);
} else {
int ret;
int len = vsnprintf(dprint_in_signal_buffer,
DPRINT_IN_SIGNAL_BUF_SIZE,
format, ap);
@ -39,7 +40,9 @@ static inline void sigsafe_printf(const char *format, ...)
*/
if (len > DPRINT_IN_SIGNAL_BUF_SIZE)
len = DPRINT_IN_SIGNAL_BUF_SIZE;
write(1, dprint_in_signal_buffer, len);
ret = write(1, dprint_in_signal_buffer, len);
if (ret < 0)
abort();
}
va_end(ap);
}