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authorCatalin Marinas <catalin.marinas@arm.com>2017-07-06 15:40:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-06 16:24:34 -0700
commit94f4a1618b4c2b268f9e70bd1516932927782293 (patch)
treec8f76fa18273c8038f951dca271fd7871952a2c2 /include/linux
parent04f70d13ca274d62a347815ca01fea871f9b9a40 (diff)
mm: kmemleak: treat vm_struct as alternative reference to vmalloc'ed objects
Kmemleak requires that vmalloc'ed objects have a minimum reference count of 2: one in the corresponding vm_struct object and the other owned by the vmalloc() caller. There are cases, however, where the original vmalloc() returned pointer is lost and, instead, a pointer to vm_struct is stored (see free_thread_stack()). Kmemleak currently reports such objects as leaks. This patch adds support for treating any surplus references to an object as additional references to a specified object. It introduces the kmemleak_vmalloc() API function which takes a vm_struct pointer and sets its surplus reference passing to the actual vmalloc() returned pointer. The __vmalloc_node_range() calling site has been modified accordingly. Link: http://lkml.kernel.org/r/1495726937-23557-4-git-send-email-catalin.marinas@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: "Luis R. Rodriguez" <mcgrof@kernel.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: "Luis R. Rodriguez" <mcgrof@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/kmemleak.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/kmemleak.h b/include/linux/kmemleak.h
index 1c2a32829620..590343f6c1b1 100644
--- a/include/linux/kmemleak.h
+++ b/include/linux/kmemleak.h
@@ -22,6 +22,7 @@
#define __KMEMLEAK_H
#include <linux/slab.h>
+#include <linux/vmalloc.h>
#ifdef CONFIG_DEBUG_KMEMLEAK
@@ -30,6 +31,8 @@ extern void kmemleak_alloc(const void *ptr, size_t size, int min_count,
gfp_t gfp) __ref;
extern void kmemleak_alloc_percpu(const void __percpu *ptr, size_t size,
gfp_t gfp) __ref;
+extern void kmemleak_vmalloc(const struct vm_struct *area, size_t size,
+ gfp_t gfp) __ref;
extern void kmemleak_free(const void *ptr) __ref;
extern void kmemleak_free_part(const void *ptr, size_t size) __ref;
extern void kmemleak_free_percpu(const void __percpu *ptr) __ref;
@@ -81,6 +84,10 @@ static inline void kmemleak_alloc_percpu(const void __percpu *ptr, size_t size,
gfp_t gfp)
{
}
+static inline void kmemleak_vmalloc(const struct vm_struct *area, size_t size,
+ gfp_t gfp)
+{
+}
static inline void kmemleak_free(const void *ptr)
{
}