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| author |   Andy Lutomirski <luto@kernel.org> | 2020-07-03 10:02:54 -0700 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2020-07-04 19:47:25 +0200 |
| commit | 3c73b81a9164d0c1b6379d6672d2772a9e95168e (patch) | |
| tree | c8af1056a6fdf747ff0cc9c11b4727f9ce051720 /tools | |
| parent | x86/entry/compat: Clear RAX high bits on Xen PV SYSENTER (diff) | |
| download | linux-dev-3c73b81a9164d0c1b6379d6672d2772a9e95168e.tar.xz linux-dev-3c73b81a9164d0c1b6379d6672d2772a9e95168e.zip | |
x86/entry, selftests: Further improve user entry sanity checks
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
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/x86/syscall_nt.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tools/testing/selftests/x86/syscall_nt.c b/tools/testing/selftests/x86/syscall_nt.c index 970e5e14d96d..a108b80dd082 100644 --- a/tools/testing/selftests/x86/syscall_nt.c +++ b/tools/testing/selftests/x86/syscall_nt.c @@ -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; } |