diff options
| author | Andy Lutomirski <[email protected]> | 2019-07-11 20:57:43 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2019-07-12 11:05:45 -0700 |
| commit | b5d1c39f34d1c9bca0c4b9ae2e339fbbe264a9c7 (patch) | |
| tree | a3f85255181b5ad7416dc978c3c74bc88e6088a1 /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | aa712399c1e8245c375a5c44760de684ec2ebefb (diff) | |
mm/gup.c: remove some BUG_ONs from get_gate_page()
If we end up without a PGD or PUD entry backing the gate area, don't BUG
-- just fail gracefully.
It's not entirely implausible that this could happen some day on x86. It
doesn't right now even with an execute-only emulated vsyscall page because
the fixmap shares the PUD, but the core mm code shouldn't rely on that
particular detail to avoid OOPSing.
Link: http://lkml.kernel.org/r/a1d9f4efb75b9d464e59fd6af00104b21c58f6f7.1561610798.git.luto@kernel.org
Signed-off-by: Andy Lutomirski <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Florian Weimer <[email protected]>
Cc: Jann Horn <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions