From d0d845a790d31adb0c90f1f8364de199b23128c8 Mon Sep 17 00:00:00 2001 From: Hamza Mahfooz Date: Fri, 30 Jul 2021 01:23:55 -0400 Subject: [PATCH] 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 Signed-off-by: John Johansen --- security/apparmor/apparmorfs.c | 11 +++++------ 1 file 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;