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authorMarco Elver <elver@google.com>2022-04-15 05:13:40 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-04-16 00:49:55 +0300
commit2dfe63e61cc31ee59ce951672b0850b5229cd5b0 (patch)
tree9194074ed5008747db7b6a0aed068751d8b50b20 /mm/slab.c
parentb1add418d457bc30cdd6a89c2bba092cd8941fcf (diff)
downloadlinux-2dfe63e61cc31ee59ce951672b0850b5229cd5b0.tar.xz
mm, kfence: support kmem_dump_obj() for KFENCE objects
Calling kmem_obj_info() via kmem_dump_obj() on KFENCE objects has been producing garbage data due to the object not actually being maintained by SLAB or SLUB. Fix this by implementing __kfence_obj_info() that copies relevant information to struct kmem_obj_info when the object was allocated by KFENCE; this is called by a common kmem_obj_info(), which also calls the slab/slub/slob specific variant now called __kmem_obj_info(). For completeness, kmem_dump_obj() now displays if the object was allocated by KFENCE. Link: https://lore.kernel.org/all/20220323090520.GG16885@xsang-OptiPlex-9020/ Link: https://lkml.kernel.org/r/20220406131558.3558585-1-elver@google.com Fixes: b89fb5ef0ce6 ("mm, kfence: insert KFENCE hooks for SLUB") Fixes: d3fb45f370d9 ("mm, kfence: insert KFENCE hooks for SLAB") Signed-off-by: Marco Elver <elver@google.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Reported-by: kernel test robot <oliver.sang@intel.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> [slab] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slab.c b/mm/slab.c
index b04e40078bdf..0edb474edef1 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3665,7 +3665,7 @@ EXPORT_SYMBOL(__kmalloc_node_track_caller);
#endif /* CONFIG_NUMA */
#ifdef CONFIG_PRINTK
-void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
+void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
{
struct kmem_cache *cachep;
unsigned int objnr;