[PATCH v2] apparmor: try to avoid refing the label in apparmor_file_open

[Mateusz Guzik <mjguzik@gmail.com>]

apparmor: try to avoid refing the label in apparmor_file_open

If the label is not stale (which is the common case), the fact that the
passed file object holds a reference can be leverged to avoid the
ref/unref cycle. Doing so reduces performance impact of apparmor on
parallel open() invocations.

When benchmarking on a 24-core vm using will-it-scale's open1_process
("Separate file open"), the results are (ops/s):
before: 6092196
after:  8309726 (+36%)

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
---

v2:
- reword the commit message

If you want any changes made to it can you just do them on your own
accord? :) Will be faster for both of us than another mail trip.

 security/apparmor/include/cred.h | 20 ++++++++++++++++++++
 security/apparmor/lsm.c          |  5 +++--
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/security/apparmor/include/cred.h b/security/apparmor/include/cred.h
index 58fdc72af664..7265d2f81dd5 100644
--- a/security/apparmor/include/cred.h
+++ b/security/apparmor/include/cred.h
@@ -63,6 +63,26 @@ static inline struct aa_label *aa_get_newest_cred_label(const struct cred *cred)
 	return aa_get_newest_label(aa_cred_raw_label(cred));
 }
 
+static inline struct aa_label *aa_get_newest_cred_label_condref(const struct cred *cred,
+								bool *needput)
+{
+	struct aa_label *l = aa_cred_raw_label(cred);
+
+	if (unlikely(label_is_stale(l))) {
+		*needput = true;
+		return aa_get_newest_label(l);
+	}
+
+	*needput = false;
+	return l;
+}
+
+static inline void aa_put_label_condref(struct aa_label *l, bool needput)
+{
+	if (unlikely(needput))
+		aa_put_label(l);
+}
+
 /**
  * aa_current_raw_label - find the current tasks confining label
  *
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 2cea34657a47..4bf87eac4a56 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -461,6 +461,7 @@ static int apparmor_file_open(struct file *file)
 	struct aa_file_ctx *fctx = file_ctx(file);
 	struct aa_label *label;
 	int error = 0;
+	bool needput;
 
 	if (!path_mediated_fs(file->f_path.dentry))
 		return 0;
@@ -477,7 +478,7 @@ static int apparmor_file_open(struct file *file)
 		return 0;
 	}
 
-	label = aa_get_newest_cred_label(file->f_cred);
+	label = aa_get_newest_cred_label_condref(file->f_cred, &needput);
 	if (!unconfined(label)) {
 		struct mnt_idmap *idmap = file_mnt_idmap(file);
 		struct inode *inode = file_inode(file);
@@ -494,7 +495,7 @@ static int apparmor_file_open(struct file *file)
 		/* todo cache full allowed permissions set and state */
 		fctx->allow = aa_map_file_to_perms(file);
 	}
-	aa_put_label(label);
+	aa_put_label_condref(label, needput);
 
 	return error;
 }
-- 
2.43.0