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| author | Hamza Mahfooz <someguy@effective-light.com> | 2021-07-30 01:23:55 -0400 |
|---|---|---|
| committer | John Johansen <john.johansen@canonical.com> | 2021-11-03 00:46:28 -0700 |
| commit | d0d845a790d31adb0c90f1f8364de199b23128c8 (patch) | |
| tree | 8dfa40741abf244ba02f92c10f91bede7f3c9eb0 | |
| parent | aa4ceed7c3276852031a3e3d6fa767ff1858831f (diff) | |
| download | linux-stable-d0d845a790d31adb0c90f1f8364de199b23128c8.tar.gz linux-stable-d0d845a790d31adb0c90f1f8364de199b23128c8.tar.bz2 linux-stable-d0d845a790d31adb0c90f1f8364de199b23128c8.zip | |
apparmor: use per file locks for transactional queries
As made mention of in commit 1dea3b41e84c5 ("apparmor: speed up
transactional queries"), a single lock is currently used to synchronize
transactional queries. We can, use the lock allocated for each file by
VFS instead.
Signed-off-by: Hamza Mahfooz <someguy@effective-light.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
| -rw-r--r-- | security/apparmor/apparmorfs.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c index a515d1f6d951..0920f5188631 100644 --- a/security/apparmor/apparmorfs.c +++ b/security/apparmor/apparmorfs.c @@ -811,8 +811,6 @@ struct multi_transaction { }; #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction)) -/* TODO: replace with per file lock */ -static DEFINE_SPINLOCK(multi_transaction_lock); static void multi_transaction_kref(struct kref *kref) { @@ -846,10 +844,10 @@ static void multi_transaction_set(struct file *file, AA_BUG(n > MULTI_TRANSACTION_LIMIT); new->size = n; - spin_lock(&multi_transaction_lock); + spin_lock(&file->f_lock); old = (struct multi_transaction *) file->private_data; file->private_data = new; - spin_unlock(&multi_transaction_lock); + spin_unlock(&file->f_lock); put_multi_transaction(old); } @@ -878,9 +876,10 @@ static ssize_t multi_transaction_read(struct file *file, char __user *buf, struct multi_transaction *t; ssize_t ret; - spin_lock(&multi_transaction_lock); + spin_lock(&file->f_lock); t = get_multi_transaction(file->private_data); - spin_unlock(&multi_transaction_lock); + spin_unlock(&file->f_lock); + if (!t) return 0; |