This is a note to let you know that I've just added the patch titled
selinux: fix inode_doinit_with_dentry() LABEL_INVALID error handling
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selinux-fix-inode_doinit_with_dentry-label_invalid-e.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 90e3a1cb90dc445726d2422ea450d216f9fbc87f
Author: Paul Moore <paul@xxxxxxxxxxxxxx>
Date: Tue Nov 3 11:49:38 2020 -0500
selinux: fix inode_doinit_with_dentry() LABEL_INVALID error handling
commit 200ea5a2292dc444a818b096ae6a32ba3caa51b9 upstream.
A previous fix, commit 83370b31a915 ("selinux: fix error initialization
in inode_doinit_with_dentry()"), changed how failures were handled
before a SELinux policy was loaded. Unfortunately that patch was
potentially problematic for two reasons: it set the isec->initialized
state without holding a lock, and it didn't set the inode's SELinux
label to the "default" for the particular filesystem. The later can
be a problem if/when a later attempt to revalidate the inode fails
and SELinux reverts to the existing inode label.
This patch should restore the default inode labeling that existed
before the original fix, without affecting the LABEL_INVALID marking
such that revalidation will still be attempted in the future.
Fixes: 83370b31a915 ("selinux: fix error initialization in inode_doinit_with_dentry()")
Reported-by: Sven Schnelle <svens@xxxxxxxxxxxxx>
Tested-by: Sven Schnelle <svens@xxxxxxxxxxxxx>
Reviewed-by: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Signed-off-by: Alexander Grund <theflamefire89@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index b9c7e089906c..ac2381eec27f 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1450,13 +1450,7 @@ 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.
*/
- isec->initialized = LABEL_INVALID;
- /*
- * There is nothing useful to jump to the "out"
- * label, except a needless spin lock/unlock
- * cycle.
- */
- return 0;
+ goto out_invalid;
}
len = INITCONTEXTLEN;
@@ -1564,15 +1558,8 @@ 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) {
- isec->initialized = LABEL_INVALID;
- /*
- * There is nothing useful to jump to the "out"
- * label, except a needless spin lock/unlock
- * cycle.
- */
- return 0;
- }
+ if (!dentry)
+ goto out_invalid;
rc = selinux_genfs_get_sid(dentry, sclass,
sbsec->flags, &sid);
dput(dentry);
@@ -1585,11 +1572,10 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
out:
spin_lock(&isec->lock);
if (isec->initialized == LABEL_PENDING) {
- if (!sid || rc) {
+ if (rc) {
isec->initialized = LABEL_INVALID;
goto out_unlock;
}
-
isec->initialized = LABEL_INITIALIZED;
isec->sid = sid;
}
@@ -1597,6 +1583,15 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
out_unlock:
spin_unlock(&isec->lock);
return rc;
+
+out_invalid:
+ spin_lock(&isec->lock);
+ if (isec->initialized == LABEL_PENDING) {
+ isec->initialized = LABEL_INVALID;
+ isec->sid = sid;
+ }
+ spin_unlock(&isec->lock);
+ return 0;
}
/* Convert a Linux signal to an access vector. */
