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| author | Alexander Popov <alex.popov@linux.com> | 2020-12-15 06:04:33 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-15 23:13:37 +0300 |
| commit | a32d654db543843a5ffb248feaec1a909718addd (patch) | |
| tree | e7d4d79eb4ff3668d1c394ee4f709c76ccfea77d | |
| parent | 0c06dd75514327be4b1c22b109341ff7dfeeff98 (diff) | |
| download | linux-a32d654db543843a5ffb248feaec1a909718addd.tar.xz | |
mm/slab: rerform init_on_free earlier
Currently in CONFIG_SLAB init_on_free happens too late, and heap objects
go to the heap quarantine not being erased.
Lets move init_on_free clearing before calling kasan_slab_free(). In that
case heap quarantine will store erased objects, similarly to CONFIG_SLUB=y
behavior.
Link: https://lkml.kernel.org/r/20201210183729.1261524-1-alex.popov@linux.com
Signed-off-by: Alexander Popov <alex.popov@linux.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/slab.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/slab.c b/mm/slab.c index 2e67a513b0c9..176b65e2157d 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3417,6 +3417,9 @@ free_done: static __always_inline void __cache_free(struct kmem_cache *cachep, void *objp, unsigned long caller) { + if (unlikely(slab_want_init_on_free(cachep))) + memset(objp, 0, cachep->object_size); + /* Put the object into the quarantine, don't touch it for now. */ if (kasan_slab_free(cachep, objp, _RET_IP_)) return; @@ -3435,8 +3438,6 @@ void ___cache_free(struct kmem_cache *cachep, void *objp, struct array_cache *ac = cpu_cache_get(cachep); check_irq_off(); - if (unlikely(slab_want_init_on_free(cachep))) - memset(objp, 0, cachep->object_size); kmemleak_free_recursive(objp, cachep->flags); objp = cache_free_debugcheck(cachep, objp, caller); memcg_slab_free_hook(cachep, &objp, 1); |