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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 <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Stas Sergeev <[email protected]>
Link: http://lkml.kernel.org/r/08f83295460a80e41dc5e3e81ec40d6844d316f5.1446270067.git.luto@kernel.org
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Andy Lutomirski 2015-10-30 22:42:45 -07:00 • committed by Thomas Gleixner
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);
}