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| author | Andy Lutomirski <luto@kernel.org> | 2015-04-25 01:09:19 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-08 14:33:59 +0300 |
| commit | e22438f8e997ac1c8911d8808b6a4c492cd8bc6e (patch) | |
| tree | 38697c66741d33e743d8f93dd70dd0f89180f5b7 /tools/testing/selftests/x86/Makefile | |
| parent | 7ae383be81781c5e1347f71c3eb0d53ce5188200 (diff) | |
| download | linux-e22438f8e997ac1c8911d8808b6a4c492cd8bc6e.tar.xz | |
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: e7d6eefaaa44 ("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>
Diffstat (limited to 'tools/testing/selftests/x86/Makefile')
| -rw-r--r-- | tools/testing/selftests/x86/Makefile | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile index ddf63569df5a..9309097f58e8 100644 --- a/tools/testing/selftests/x86/Makefile +++ b/tools/testing/selftests/x86/Makefile @@ -1,6 +1,6 @@ .PHONY: all all_32 all_64 check_build32 clean run_tests -TARGETS_C_BOTHBITS := sigreturn single_step_syscall +TARGETS_C_BOTHBITS := sigreturn single_step_syscall sysret_ss_attrs BINARIES_32 := $(TARGETS_C_BOTHBITS:%=%_32) BINARIES_64 := $(TARGETS_C_BOTHBITS:%=%_64) @@ -46,3 +46,6 @@ check_build32: echo " yum install glibc-devel.*i686"; \ exit 1; \ fi + +# Some tests have additional dependencies. +sysret_ss_attrs_64: thunks.S |