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selftests/x86: Add a fork() to entry_from_vm86 to catch fork bugs

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Mere possession of vm86 state is strange.  Make sure that nothing
gets corrupted if we fork after calling vm86().

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Stas Sergeev <stsp@list.ru>
Link: http://lkml.kernel.org/r/08f83295460a80e41dc5e3e81ec40d6844d316f5.1446270067.git.luto@kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andy Lutomirski 2015-10-30 22:42:45 -07:00 committed by Thomas Gleixner
parent ababae4410
commit 226f1f729c
1 changed files with 4 additions and 0 deletions
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4
tools/testing/selftests/x86/entry_from_vm86.c
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@ -230,5 +230,9 @@ int main(void)
}
clearhandler(SIGSEGV);
/* Make sure nothing explodes if we fork. */
if (fork() > 0)
return 0;
return (nerrs == 0 ? 0 : 1);
}