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Diffstat (limited to 'mm')
-rw-r--r--mm/slab.c180
-rw-r--r--mm/util.c4
2 files changed, 176 insertions, 8 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 26138c9f8f0..a5047161084 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -204,7 +204,8 @@
typedef unsigned int kmem_bufctl_t;
#define BUFCTL_END (((kmem_bufctl_t)(~0U))-0)
#define BUFCTL_FREE (((kmem_bufctl_t)(~0U))-1)
-#define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-2)
+#define BUFCTL_ACTIVE (((kmem_bufctl_t)(~0U))-2)
+#define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-3)
/* Max number of objs-per-slab for caches which use off-slab slabs.
* Needed to avoid a possible looping condition in cache_grow().
@@ -2399,7 +2400,7 @@ static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp,
/* Verify that the slab belongs to the intended node */
WARN_ON(slabp->nodeid != nodeid);
- if (slab_bufctl(slabp)[objnr] != BUFCTL_FREE) {
+ if (slab_bufctl(slabp)[objnr] + 1 <= SLAB_LIMIT + 1) {
printk(KERN_ERR "slab: double free detected in cache "
"'%s', objp %p\n", cachep->name, objp);
BUG();
@@ -2605,6 +2606,9 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
*/
cachep->dtor(objp + obj_offset(cachep), cachep, 0);
}
+#ifdef CONFIG_DEBUG_SLAB_LEAK
+ slab_bufctl(slabp)[objnr] = BUFCTL_FREE;
+#endif
if (cachep->flags & SLAB_POISON) {
#ifdef CONFIG_DEBUG_PAGEALLOC
if ((cachep->buffer_size % PAGE_SIZE)==0 && OFF_SLAB(cachep)) {
@@ -2788,6 +2792,16 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
*dbg_redzone1(cachep, objp) = RED_ACTIVE;
*dbg_redzone2(cachep, objp) = RED_ACTIVE;
}
+#ifdef CONFIG_DEBUG_SLAB_LEAK
+ {
+ struct slab *slabp;
+ unsigned objnr;
+
+ slabp = page_get_slab(virt_to_page(objp));
+ objnr = (unsigned)(objp - slabp->s_mem) / cachep->buffer_size;
+ slab_bufctl(slabp)[objnr] = BUFCTL_ACTIVE;
+ }
+#endif
objp += obj_offset(cachep);
if (cachep->ctor && cachep->flags & SLAB_POISON) {
unsigned long ctor_flags = SLAB_CTOR_CONSTRUCTOR;
@@ -3220,22 +3234,23 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
return __cache_alloc(cachep, flags, caller);
}
-#ifndef CONFIG_DEBUG_SLAB
void *__kmalloc(size_t size, gfp_t flags)
{
+#ifndef CONFIG_DEBUG_SLAB
return __do_kmalloc(size, flags, NULL);
+#else
+ return __do_kmalloc(size, flags, __builtin_return_address(0));
+#endif
}
EXPORT_SYMBOL(__kmalloc);
-#else
-
+#ifdef CONFIG_DEBUG_SLAB
void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller)
{
return __do_kmalloc(size, flags, caller);
}
EXPORT_SYMBOL(__kmalloc_track_caller);
-
#endif
#ifdef CONFIG_SMP
@@ -3899,6 +3914,159 @@ ssize_t slabinfo_write(struct file *file, const char __user * buffer,
res = count;
return res;
}
+
+#ifdef CONFIG_DEBUG_SLAB_LEAK
+
+static void *leaks_start(struct seq_file *m, loff_t *pos)
+{
+ loff_t n = *pos;
+ struct list_head *p;
+
+ mutex_lock(&cache_chain_mutex);
+ p = cache_chain.next;
+ while (n--) {
+ p = p->next;
+ if (p == &cache_chain)
+ return NULL;
+ }
+ return list_entry(p, struct kmem_cache, next);
+}
+
+static inline int add_caller(unsigned long *n, unsigned long v)
+{
+ unsigned long *p;
+ int l;
+ if (!v)
+ return 1;
+ l = n[1];
+ p = n + 2;
+ while (l) {
+ int i = l/2;
+ unsigned long *q = p + 2 * i;
+ if (*q == v) {
+ q[1]++;
+ return 1;
+ }
+ if (*q > v) {
+ l = i;
+ } else {
+ p = q + 2;
+ l -= i + 1;
+ }
+ }
+ if (++n[1] == n[0])
+ return 0;
+ memmove(p + 2, p, n[1] * 2 * sizeof(unsigned long) - ((void *)p - (void *)n));
+ p[0] = v;
+ p[1] = 1;
+ return 1;
+}
+
+static void handle_slab(unsigned long *n, struct kmem_cache *c, struct slab *s)
+{
+ void *p;
+ int i;
+ if (n[0] == n[1])
+ return;
+ for (i = 0, p = s->s_mem; i < c->num; i++, p += c->buffer_size) {
+ if (slab_bufctl(s)[i] != BUFCTL_ACTIVE)
+ continue;
+ if (!add_caller(n, (unsigned long)*dbg_userword(c, p)))
+ return;
+ }
+}
+
+static void show_symbol(struct seq_file *m, unsigned long address)
+{
+#ifdef CONFIG_KALLSYMS
+ char *modname;
+ const char *name;
+ unsigned long offset, size;
+ char namebuf[KSYM_NAME_LEN+1];
+
+ name = kallsyms_lookup(address, &size, &offset, &modname, namebuf);
+
+ if (name) {
+ seq_printf(m, "%s+%#lx/%#lx", name, offset, size);
+ if (modname)
+ seq_printf(m, " [%s]", modname);
+ return;
+ }
+#endif
+ seq_printf(m, "%p", (void *)address);
+}
+
+static int leaks_show(struct seq_file *m, void *p)
+{
+ struct kmem_cache *cachep = p;
+ struct list_head *q;
+ struct slab *slabp;
+ struct kmem_list3 *l3;
+ const char *name;
+ unsigned long *n = m->private;
+ int node;
+ int i;
+
+ if (!(cachep->flags & SLAB_STORE_USER))
+ return 0;
+ if (!(cachep->flags & SLAB_RED_ZONE))
+ return 0;
+
+ /* OK, we can do it */
+
+ n[1] = 0;
+
+ for_each_online_node(node) {
+ l3 = cachep->nodelists[node];
+ if (!l3)
+ continue;
+
+ check_irq_on();
+ spin_lock_irq(&l3->list_lock);
+
+ list_for_each(q, &l3->slabs_full) {
+ slabp = list_entry(q, struct slab, list);
+ handle_slab(n, cachep, slabp);
+ }
+ list_for_each(q, &l3->slabs_partial) {
+ slabp = list_entry(q, struct slab, list);
+ handle_slab(n, cachep, slabp);
+ }
+ spin_unlock_irq(&l3->list_lock);
+ }
+ name = cachep->name;
+ if (n[0] == n[1]) {
+ /* Increase the buffer size */
+ mutex_unlock(&cache_chain_mutex);
+ m->private = kzalloc(n[0] * 4 * sizeof(unsigned long), GFP_KERNEL);
+ if (!m->private) {
+ /* Too bad, we are really out */
+ m->private = n;
+ mutex_lock(&cache_chain_mutex);
+ return -ENOMEM;
+ }
+ *(unsigned long *)m->private = n[0] * 2;
+ kfree(n);
+ mutex_lock(&cache_chain_mutex);
+ /* Now make sure this entry will be retried */
+ m->count = m->size;
+ return 0;
+ }
+ for (i = 0; i < n[1]; i++) {
+ seq_printf(m, "%s: %lu ", name, n[2*i+3]);
+ show_symbol(m, n[2*i+2]);
+ seq_putc(m, '\n');
+ }
+ return 0;
+}
+
+struct seq_operations slabstats_op = {
+ .start = leaks_start,
+ .next = s_next,
+ .stop = s_stop,
+ .show = leaks_show,
+};
+#endif
#endif
/**
diff --git a/mm/util.c b/mm/util.c
index 49e29f751b5..b68d3d7d035 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -11,7 +11,7 @@
*/
void *kzalloc(size_t size, gfp_t flags)
{
- void *ret = kmalloc(size, flags);
+ void *ret = ____kmalloc(size, flags);
if (ret)
memset(ret, 0, size);
return ret;
@@ -33,7 +33,7 @@ char *kstrdup(const char *s, gfp_t gfp)
return NULL;
len = strlen(s) + 1;
- buf = kmalloc(len, gfp);
+ buf = ____kmalloc(len, gfp);
if (buf)
memcpy(buf, s, len);
return buf;