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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-10-12 01:30:33 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-10-12 01:30:33 -0300
commite914f8eb445e8f74b00303c19c2ffceaedd16a05 (patch)
tree86b60bdecb3cf6abe8546f30803b673892a40335 /mm/kasan
parent1c29f4306f557ef5d9ed515ec8881f4d1735b058 (diff)
Linux-libre 4.7.6-gnupck-4.7.6-gnu
Diffstat (limited to 'mm/kasan')
-rw-r--r--mm/kasan/kasan.c4
-rw-r--r--mm/kasan/quarantine.c9
2 files changed, 9 insertions, 4 deletions
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 6845f9294..50e92c585 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -562,7 +562,7 @@ void kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size,
unsigned long redzone_start;
unsigned long redzone_end;
- if (flags & __GFP_RECLAIM)
+ if (gfpflags_allow_blocking(flags))
quarantine_reduce();
if (unlikely(object == NULL))
@@ -595,7 +595,7 @@ void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
unsigned long redzone_start;
unsigned long redzone_end;
- if (flags & __GFP_RECLAIM)
+ if (gfpflags_allow_blocking(flags))
quarantine_reduce();
if (unlikely(ptr == NULL))
diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
index 65793f150..a04887c62 100644
--- a/mm/kasan/quarantine.c
+++ b/mm/kasan/quarantine.c
@@ -196,7 +196,7 @@ void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache)
void quarantine_reduce(void)
{
- size_t new_quarantine_size;
+ size_t new_quarantine_size, percpu_quarantines;
unsigned long flags;
struct qlist_head to_free = QLIST_INIT;
size_t size_to_free = 0;
@@ -214,7 +214,12 @@ void quarantine_reduce(void)
*/
new_quarantine_size = (READ_ONCE(totalram_pages) << PAGE_SHIFT) /
QUARANTINE_FRACTION;
- new_quarantine_size -= QUARANTINE_PERCPU_SIZE * num_online_cpus();
+ percpu_quarantines = QUARANTINE_PERCPU_SIZE * num_online_cpus();
+ if (WARN_ONCE(new_quarantine_size < percpu_quarantines,
+ "Too little memory, disabling global KASAN quarantine.\n"))
+ new_quarantine_size = 0;
+ else
+ new_quarantine_size -= percpu_quarantines;
WRITE_ONCE(quarantine_size, new_quarantine_size);
last = global_quarantine.head;