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| author | Anthony Steinhauser <asteinhauser@google.com> | 2020-06-07 05:44:19 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-20 10:23:17 +0200 |
| commit | 7a5764e8990096fd08e8566b87df3c111bf5a736 (patch) | |
| tree | 6e4a3626696a4a725dc838b35e3623ffd679ba47 /tools/perf/scripts/python | |
| parent | 317b9c418ea38089a6d5c42fcaa9a545334838c3 (diff) | |
x86/speculation: PR_SPEC_FORCE_DISABLE enforcement for indirect branches.
[ Upstream commit 4d8df8cbb9156b0a0ab3f802b80cb5db57acc0bf ]
Currently, it is possible to enable indirect branch speculation even after
it was force-disabled using the PR_SPEC_FORCE_DISABLE option. Moreover, the
PR_GET_SPECULATION_CTRL command gives afterwards an incorrect result
(force-disabled when it is in fact enabled). This also is inconsistent
vs. STIBP and the documention which cleary states that
PR_SPEC_FORCE_DISABLE cannot be undone.
Fix this by actually enforcing force-disabled indirect branch
speculation. PR_SPEC_ENABLE called after PR_SPEC_FORCE_DISABLE now fails
with -EPERM as described in the documentation.
Fixes: 9137bb27e60e ("x86/speculation: Add prctl() control for indirect branch speculation")
Signed-off-by: Anthony Steinhauser <asteinhauser@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions