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authorJohn Johansen <john.johansen@canonical.com>2019-12-18 22:04:07 +0300
committerJohn Johansen <john.johansen@canonical.com>2020-01-02 16:31:40 +0300
commit20d4e80d255dd7cfecb53743bc550ebcad04549d (patch)
treec740dec5f800df330c303db8018620b8bb0371f1 /security/apparmor/file.c
parent9c95a278ba7ca3ccc111c165cc74cb23c744fc85 (diff)
downloadlinux-20d4e80d255dd7cfecb53743bc550ebcad04549d.tar.xz
apparmor: only get a label reference if the fast path check fails
The common fast path check can be done under rcu_read_lock() and doesn't need a reference count on the label. Only take a reference count if entering the slow path. Fixes reported hackbench regression - sha1 79e178a57dae ("Merge tag 'apparmor-pr-2019-12-03' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor") hackbench -l (256000/#grp) -g #grp 128 groups 19.679 ±0.90% - previous sha1 01d1dff64662 ("Merge tag 's390-5.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux") hackbench -l (256000/#grp) -g #grp 128 groups 3.1689 ±3.04% Reported-by: Vincent Guittot <vincent.guittot@linaro.org> Tested-by: Vincent Guittot <vincent.guittot@linaro.org> Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Fixes: bce4e7e9c45e ("apparmor: reduce rcu_read_lock scope for aa_file_perm mediation") Signed-off-by: John Johansen <john.johansen@canonical.com>
Diffstat (limited to 'security/apparmor/file.c')
-rw-r--r--security/apparmor/file.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/security/apparmor/file.c b/security/apparmor/file.c
index fe2ebe5e865e..f1caf3674e1c 100644
--- a/security/apparmor/file.c
+++ b/security/apparmor/file.c
@@ -618,8 +618,7 @@ int aa_file_perm(const char *op, struct aa_label *label, struct file *file,
fctx = file_ctx(file);
rcu_read_lock();
- flabel = aa_get_newest_label(rcu_dereference(fctx->label));
- rcu_read_unlock();
+ flabel = rcu_dereference(fctx->label);
AA_BUG(!flabel);
/* revalidate access, if task is unconfined, or the cached cred
@@ -631,9 +630,13 @@ int aa_file_perm(const char *op, struct aa_label *label, struct file *file,
*/
denied = request & ~fctx->allow;
if (unconfined(label) || unconfined(flabel) ||
- (!denied && aa_label_is_subset(flabel, label)))
+ (!denied && aa_label_is_subset(flabel, label))) {
+ rcu_read_unlock();
goto done;
+ }
+ flabel = aa_get_newest_label(flabel);
+ rcu_read_unlock();
/* TODO: label cross check */
if (file->f_path.mnt && path_mediated_fs(file->f_path.dentry))
@@ -643,8 +646,9 @@ int aa_file_perm(const char *op, struct aa_label *label, struct file *file,
else if (S_ISSOCK(file_inode(file)->i_mode))
error = __file_sock_perm(op, label, flabel, file, request,
denied);
-done:
aa_put_label(flabel);
+
+done:
return error;
}