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authorDave Hansen <dave.hansen@linux.intel.com>2017-11-10 16:12:32 -0800
committerIngo Molnar <mingo@kernel.org>2017-11-21 09:34:52 +0100
commit7b659ee3e1fe0e8eb39730afb903c64e25490ec4 (patch)
tree9649c9e18c9ac1726b29f2ae4f9c0f4b9446763c /tools
parent91c49c2deb96ffc3c461eaae70219d89224076b7 (diff)
x86/pkeys/selftests: Fix protection keys write() warning
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>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/x86/pkey-helpers.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/testing/selftests/x86/pkey-helpers.h b/tools/testing/selftests/x86/pkey-helpers.h
index 3818f25391c2..b3cb7670e026 100644
--- a/tools/testing/selftests/x86/pkey-helpers.h
+++ b/tools/testing/selftests/x86/pkey-helpers.h
@@ -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);
}