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| author | Marco Elver <elver@google.com> | 2021-11-05 23:45:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-12 17:05:49 +0300 |
| commit | 93ce7441001f52c283629b9b9bb77c1056de1900 (patch) | |
| tree | 851d6d268a3ff91c3b8d10629502db641300fabf /lib | |
| parent | 5e57d171e2e6398aee9ae57bdb60b87d3925615f (diff) | |
| download | linux-93ce7441001f52c283629b9b9bb77c1056de1900.tar.xz | |
kfence: always use static branches to guard kfence_alloc()
commit 07e8481d3c38f461d7b79c1d5c9afe013b162b0c upstream.
Regardless of KFENCE mode (CONFIG_KFENCE_STATIC_KEYS: either using
static keys to gate allocations, or using a simple dynamic branch),
always use a static branch to avoid the dynamic branch in kfence_alloc()
if KFENCE was disabled at boot.
For CONFIG_KFENCE_STATIC_KEYS=n, this now avoids the dynamic branch if
KFENCE was disabled at boot.
To simplify, also unifies the location where kfence_allocation_gate is
read-checked to just be inline in kfence_alloc().
Link: https://lkml.kernel.org/r/20211019102524.2807208-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions