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a/Documentation/dev-tools/kmemleak.rst +++ b/Documentation/dev-tools/kmemleak.rst @@ -163,6 +163,7 @@ See the include/linux/kmemleak.h header for the functions prototype. - ``kmemleak_not_leak`` - mark an object as not a leak - ``kmemleak_transient_leak`` - mark an object as a transient leak - ``kmemleak_ignore`` - do not scan or report an object as leak +- ``kmemleak_unignore`` - undo a previous kmemleak_ignore() - ``kmemleak_scan_area`` - add scan areas inside a memory block - ``kmemleak_no_scan`` - do not scan a memory block - ``kmemleak_erase`` - erase an old value in a pointer variable diff --git a/include/linux/kmemleak.h b/include/linux/kmemleak.h index fbd424b2abb1..4eec0560be09 100644 --- a/include/linux/kmemleak.h +++ b/include/linux/kmemleak.h @@ -28,6 +28,7 @@ extern void kmemleak_update_trace(const void *ptr) __ref; extern void kmemleak_not_leak(const void *ptr) __ref; extern void kmemleak_transient_leak(const void *ptr) __ref; extern void kmemleak_ignore(const void *ptr) __ref; +extern void kmemleak_unignore(const void *ptr, int min_count) __ref; extern void kmemleak_ignore_percpu(const void __percpu *ptr) __ref; extern void kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp) __ref; extern void kmemleak_no_scan(const void *ptr) __ref; @@ -104,6 +105,10 @@ static inline void kmemleak_ignore_percpu(const void __percpu *ptr) static inline void kmemleak_ignore(const void *ptr) { } + +static inline void kmemleak_unignore(const void *ptr, int min_count) +{ +} static inline void kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp) { } diff --git a/mm/kmemleak.c b/mm/kmemleak.c index d79acf5c5100..871e20ba3d7b 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -909,6 +909,8 @@ static void __paint_it(struct kmemleak_object *object, int color) object->min_count = color; if (color == KMEMLEAK_BLACK) object->flags |= OBJECT_NO_SCAN; + else + object->flags &= ~OBJECT_NO_SCAN; } static void paint_it(struct kmemleak_object *object, int color) @@ -1292,6 +1294,24 @@ void __ref kmemleak_ignore(const void *ptr) } EXPORT_SYMBOL(kmemleak_ignore); +/** + * kmemleak_unignore - undo a previous kmemleak_ignore() on an object + * @ptr: pointer to beginning of the object + * @min_count: minimum number of references the object must have to be + * considered a non-leak (see kmemleak_alloc() for details) + * + * Calling this function undoes a prior kmemleak_ignore() by restoring the + * given min_count, making the object visible to kmemleak again. + */ +void __ref kmemleak_unignore(const void *ptr, int min_count) +{ + pr_debug("%s(0x%px)\n", __func__, ptr); + + if (kmemleak_enabled && ptr && !IS_ERR(ptr)) + paint_ptr((unsigned long)ptr, min_count, 0); +} +EXPORT_SYMBOL(kmemleak_unignore); + /** * kmemleak_scan_area - limit the range to be scanned in an allocated object * @ptr: pointer to beginning or inside the object. This also diff --git a/mm/slab_common.c b/mm/slab_common.c index d5a70a831a2a..73f4668d870d 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -1954,8 +1954,14 @@ void kvfree_call_rcu(struct rcu_head *head, void *ptr) if (!head) might_sleep(); - if (!IS_ENABLED(CONFIG_PREEMPT_RT) && kfree_rcu_sheaf(ptr)) + if (!IS_ENABLED(CONFIG_PREEMPT_RT) && kfree_rcu_sheaf(ptr)) { + /* + * The object is now queued for deferred freeing via an RCU + * sheaf. Tell kmemleak to ignore it. + */ + kmemleak_ignore(ptr); return; + } // Queue the object but don't yet schedule the batch. if (debug_rcu_head_queue(ptr)) { diff --git a/mm/slub.c b/mm/slub.c index 20cb4f3b636d..3bfe113ae326 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3014,8 +3014,10 @@ static void pcs_flush_all(struct kmem_cache *s) free_empty_sheaf(s, spare); } - if (rcu_free) + if (rcu_free) { + kmemleak_ignore(rcu_free); call_rcu(&rcu_free->rcu_head, rcu_free_sheaf_nobarn); + } sheaf_flush_main(s); } @@ -3035,6 +3037,7 @@ static void __pcs_flush_all_cpu(struct kmem_cache *s, unsigned int cpu) } if (pcs->rcu_free) { + kmemleak_ignore(pcs->rcu_free); call_rcu(&pcs->rcu_free->rcu_head, rcu_free_sheaf_nobarn); pcs->rcu_free = NULL; } @@ -4031,8 +4034,10 @@ static void flush_rcu_sheaf(struct work_struct *w) local_unlock(&s->cpu_sheaves->lock); - if (rcu_free) + if (rcu_free) { + kmemleak_ignore(rcu_free); call_rcu(&rcu_free->rcu_head, rcu_free_sheaf_nobarn); + } } @@ -5832,6 +5837,7 @@ static void rcu_free_sheaf(struct rcu_head *head) if (data_race(barn->nr_full) < MAX_FULL_SHEAVES) { stat(s, BARN_PUT); + kmemleak_unignore(sheaf, 1); barn_put_full_sheaf(barn, sheaf); return; } @@ -5842,6 +5848,7 @@ static void rcu_free_sheaf(struct rcu_head *head) empty: if (barn && data_race(barn->nr_empty) < MAX_EMPTY_SHEAVES) { + kmemleak_unignore(sheaf, 1); barn_put_empty_sheaf(barn, sheaf); return; } @@ -5948,8 +5955,10 @@ bool __kfree_rcu_sheaf(struct kmem_cache *s, void *obj) * we flush before local_unlock to make sure a racing * flush_all_rcu_sheaves() doesn't miss this sheaf */ - if (rcu_sheaf) + if (rcu_sheaf) { + kmemleak_ignore(rcu_sheaf); call_rcu(&rcu_sheaf->rcu_head, rcu_free_sheaf); + } local_unlock(&s->cpu_sheaves->lock); @@ -7538,6 +7547,7 @@ static void early_kmem_cache_node_alloc(int node) slab->freelist = get_freepointer(kmem_cache_node, n); slab->inuse = 1; kmem_cache_node->node[node] = n; + kmemleak_alloc(n, kmem_cache_node->size, 1, GFP_NOWAIT); init_kmem_cache_node(n, NULL); inc_slabs_node(kmem_cache_node, node, slab->objects); base-commit: c23719abc3308df7ed3ad35650ad211fb2d2003d -- 2.43.0