From 83370b31a915493231e5b9addc72e4bef69f8d31 Mon Sep 17 00:00:00 2001
From: Tianyue Ren <rentianyue@kylinos.cn>
Date: Fri, 9 Oct 2020 09:36:30 +0800
Subject: [PATCH] selinux: fix error initialization in inode_doinit_with_dentry()
Git-commit: 83370b31a915493231e5b9addc72e4bef69f8d31
Patch-mainline: v5.11-rc1
References: git-fixes
Mark the inode security label as invalid if we cannot find
a dentry so that we will retry later rather than marking it
initialized with the unlabeled SID.
Fixes: 9287aed2ad1f ("selinux: Convert isec->lock into a spinlock")
Signed-off-by: Tianyue Ren <rentianyue@kylinos.cn>
[pm: minor comment tweaks]
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
---
security/selinux/hooks.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index ef2bd5edbc12..c895ee644145 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1545,7 +1545,13 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
* inode_doinit with a dentry, before these inodes could
* be used again by userspace.
*/
- goto out;
+ isec->initialized = LABEL_INVALID;
+ /*
+ * There is nothing useful to jump to the "out"
+ * label, except a needless spin lock/unlock
+ * cycle.
+ */
+ return 0;
}
len = INITCONTEXTLEN;
@@ -1653,8 +1659,15 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
* inode_doinit() with a dentry, before these inodes
* could be used again by userspace.
*/
- if (!dentry)
- goto out;
+ if (!dentry) {
+ isec->initialized = LABEL_INVALID;
+ /*
+ * There is nothing useful to jump to the "out"
+ * label, except a needless spin lock/unlock
+ * cycle.
+ */
+ return 0;
+ }
rc = selinux_genfs_get_sid(dentry, sclass,
sbsec->flags, &sid);
dput(dentry);
--
2.26.2