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FROMGIT: mm/slab: rerform init_on_free earlier

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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>

Bug: 177201466
(cherry picked from commit a32d654db543843a5ffb248feaec1a909718addd
    https://github.com/hnaz/linux-mm v5.11-rc4-mmots-2021-01-21-20-10)
Test: CONFIG_KFENCE_KUNIT_TEST=y passes on Cuttlefish
Signed-off-by: Alexander Potapenko <glider@google.com>
Change-Id: I2bf5e70c1524619526efd792bbdd959b813af1e4
This commit is contained in:
Alexander Popov 2020-12-14 19:04:33 -08:00 • committed by Michael Bestas
commit 40edd642cb
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GPG key ID: CC95044519BE6669
1 changed files with 3 additions and 2 deletions
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5
mm/slab.c
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@ -3425,6 +3425,9 @@ 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;
@ -3438,8 +3441,6 @@ 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);