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x86/entry, selftests: Further improve user entry sanity checks

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Chasing down a Xen bug caused me to realize that the new entry sanity
checks are still fairly weak.  Add some more checks.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/881de09e786ab93ce56ee4a2437ba2c308afe7a9.1593795633.git.luto@kernel.org
This commit is contained in:
Andy Lutomirski
2020-07-03 10:02:54 -07:00
committed by Thomas Gleixner
parent db5b2c5a90
commit 3c73b81a91
2 changed files with 30 additions and 0 deletions
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11
tools/testing/selftests/x86/syscall_nt.c
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@@ -81,5 +81,16 @@ int main(void)
printf("[RUN]\tSet NT|AC|TF and issue a syscall\n");
do_it(X86_EFLAGS_NT | X86_EFLAGS_AC | X86_EFLAGS_TF);
/*
* Now try DF. This is evil and it's plausible that we will crash
* glibc, but glibc would have to do something rather surprising
* for this to happen.
*/
printf("[RUN]\tSet DF and issue a syscall\n");
do_it(X86_EFLAGS_DF);
printf("[RUN]\tSet TF|DF and issue a syscall\n");
do_it(X86_EFLAGS_TF | X86_EFLAGS_DF);
return nerrs == 0 ? 0 : 1;
}