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e22438f8e9
linux/tools/testing/selftests/x86
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Andy Lutomirski e22438f8e9 x86, selftests: Add a test for the "sysret_ss_attrs" bug 
On AMD CPUs, SYSRET can return with a valid SS descriptor with
with the hidden attributes set to an unusable state.  Make sure
the kernel doesn't let this happen.  This detects an
as-yet-unfixed regression.

Note that the 64-bit version of this test fails on AMD CPUs on
all kernel versions, although the issue in the 64-bit case is
much less severe than in the 32-bit case.

Reported-by: Brian Gerst <brgerst@gmail.com>
Tested-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Tests: e7d6eefaaa ("x86/vdso32/syscall.S: Do not load __USER32_DS to %ss")
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/resend_4d740841bac383742949e2fefb03982736595087.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-08 13:33:59 +02:00
..
.gitignore
Makefile x86, selftests: Add a test for the "sysret_ss_attrs" bug 2015-05-08 13:33:59 +02:00
run_x86_tests.sh x86, selftests: Add a test for the "sysret_ss_attrs" bug 2015-05-08 13:33:59 +02:00
sigreturn.c
single_step_syscall.c x86, selftests: Add single_step_syscall test 2015-04-16 12:41:49 +02:00
sysret_ss_attrs.c x86, selftests: Add a test for the "sysret_ss_attrs" bug 2015-05-08 13:33:59 +02:00
thunks.S x86, selftests: Add a test for the "sysret_ss_attrs" bug 2015-05-08 13:33:59 +02:00
trivial_32bit_program.c