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| author | Andrey Konovalov <andreyknvl@google.com> | 2022-09-05 23:05:33 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-03 14:02:59 -0700 |
| commit | 682ed08924407b719fa0b1123a26971748d76ace (patch) | |
| tree | 6df09870ef2e533849f80a547969b25459e9d04c /include/linux/slab.h | |
| parent | be95e13fcc6ded156c65ece01486d9cc33d22dc8 (diff) | |
| download | lwn-682ed08924407b719fa0b1123a26971748d76ace.tar.gz lwn-682ed08924407b719fa0b1123a26971748d76ace.zip | |
kasan: only define kasan_cache_create for Generic mode
Right now, kasan_cache_create() assigns SLAB_KASAN for all KASAN modes and
then sets up metadata-related cache parameters for the Generic mode.
SLAB_KASAN is used in two places:
1. In slab_ksize() to account for per-object metadata when
calculating the size of the accessible memory within the object.
2. In slab_common.c via kasan_never_merge() to prevent merging of
caches with per-object metadata.
Both cases are only relevant when per-object metadata is present, which is
only the case with the Generic mode.
Thus, assign SLAB_KASAN and define kasan_cache_create() only for the
Generic mode.
Also update the SLAB_KASAN-related comment.
Link: https://lkml.kernel.org/r/61faa2aa1906e2d02c97d00ddf99ce8911dda095.1662411799.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/slab.h')
| -rw-r--r-- | include/linux/slab.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h index 352e3f082acc..617a39f7db46 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -106,7 +106,7 @@ # define SLAB_ACCOUNT 0 #endif -#ifdef CONFIG_KASAN +#ifdef CONFIG_KASAN_GENERIC #define SLAB_KASAN ((slab_flags_t __force)0x08000000U) #else #define SLAB_KASAN 0 |