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kmemleak: Report previously found leaks even after an error

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If an error fatal to kmemleak (like memory allocation failure) happens,
kmemleak disables itself but it also removes the access to any
previously found memory leaks. This patch allows read-only access to the
kmemleak debugfs interface but disables any other action.

Reported-by: Nick Bowler <nbowler@elliptictech.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2011-09-29 11:50:07 +01:00
parent b66930052a
commit 74341703ed
1 changed files with 13 additions and 9 deletions
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22
mm/kmemleak.c
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@ -1473,9 +1473,6 @@ static const struct seq_operations kmemleak_seq_ops = {
static int kmemleak_open(struct inode *inode, struct file *file)
{
if (!atomic_read(&kmemleak_enabled))
return -EBUSY;
return seq_open(file, &kmemleak_seq_ops);
}
@ -1549,6 +1546,9 @@ static ssize_t kmemleak_write(struct file *file, const char __user *user_buf,
int buf_size;
int ret;
if (!atomic_read(&kmemleak_enabled))
return -EBUSY;
buf_size = min(size, (sizeof(buf) - 1));
if (strncpy_from_user(buf, user_buf, buf_size) < 0)
return -EFAULT;
@ -1608,20 +1608,24 @@ static const struct file_operations kmemleak_fops = {
};
/*
* Perform the freeing of the kmemleak internal objects after waiting for any
* current memory scan to complete.
* Stop the memory scanning thread and free the kmemleak internal objects if
* no previous scan thread (otherwise, kmemleak may still have some useful
* information on memory leaks).
*/
static void kmemleak_do_cleanup(struct work_struct *work)
{
struct kmemleak_object *object;
bool cleanup = scan_thread == NULL;
mutex_lock(&scan_mutex);
stop_scan_thread();
rcu_read_lock();
list_for_each_entry_rcu(object, &object_list, object_list)
delete_object_full(object->pointer);
rcu_read_unlock();
if (cleanup) {
rcu_read_lock();
list_for_each_entry_rcu(object, &object_list, object_list)
delete_object_full(object->pointer);
rcu_read_unlock();
}
mutex_unlock(&scan_mutex);
}