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| author | Andy Lutomirski <luto@kernel.org> | 2019-07-11 20:57:43 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-12 11:05:45 -0700 |
| commit | b5d1c39f34d1c9bca0c4b9ae2e339fbbe264a9c7 (patch) | |
| tree | a3f85255181b5ad7416dc978c3c74bc88e6088a1 /kernel/power | |
| parent | aa712399c1e8245c375a5c44760de684ec2ebefb (diff) | |
| download | linux-b5d1c39f34d1c9bca0c4b9ae2e339fbbe264a9c7.tar.bz2 | |
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 <luto@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Jann Horn <jannh@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/power')
0 files changed, 0 insertions, 0 deletions