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| author | Alexander Potapenko <glider@google.com> | 2019-10-15 00:11:57 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-10-15 01:04:01 +0300 |
| commit | 0f181f9fbea8bc7ea2f7e13ae7f8c256b39e254c (patch) | |
| tree | a6d1d1a674b791224d2430bae6d2fa69f10037b0 /mm/page-writeback.c | |
| parent | 3c52b0af059e11a063970aed1ad143b9284a79c7 (diff) | |
| download | linux-0f181f9fbea8bc7ea2f7e13ae7f8c256b39e254c.tar.xz | |
mm/slub.c: init_on_free=1 should wipe freelist ptr for bulk allocations
slab_alloc_node() already zeroed out the freelist pointer if
init_on_free was on. Thibaut Sautereau noticed that the same needs to
be done for kmem_cache_alloc_bulk(), which performs the allocations
separately.
kmem_cache_alloc_bulk() is currently used in two places in the kernel,
so this change is unlikely to have a major performance impact.
SLAB doesn't require a similar change, as auto-initialization makes the
allocator store the freelist pointers off-slab.
Link: http://lkml.kernel.org/r/20191007091605.30530-1-glider@google.com
Fixes: 6471384af2a6 ("mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options")
Signed-off-by: Alexander Potapenko <glider@google.com>
Reported-by: Thibaut Sautereau <thibaut@sautereau.fr>
Reported-by: Kees Cook <keescook@chromium.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Laura Abbott <labbott@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page-writeback.c')
0 files changed, 0 insertions, 0 deletions