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authorPaul Moore <paul@paul-moore.com>2020-11-03 11:49:38 -0500
committerPaul Moore <paul@paul-moore.com>2020-11-05 22:47:31 -0500
commit200ea5a2292dc444a818b096ae6a32ba3caa51b9 (patch)
tree399427f050ca3db3ed79628ef296d2200c605f6c /security
parent44141f58e14317853698f994ca5c3785a0c230d0 (diff)
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selinux: fix inode_doinit_with_dentry() LABEL_INVALID error handling
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@linux.ibm.com> Tested-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/hooks.c31
1 files changed, 13 insertions, 18 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 158fc47d8620..c46312710e73 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1451,13 +1451,7 @@ 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;
}
rc = inode_doinit_use_xattr(inode, dentry, sbsec->def_sid,
@@ -1513,15 +1507,8 @@ 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);
if (rc) {
@@ -1546,11 +1533,10 @@ 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;
}
@@ -1558,6 +1544,15 @@ out:
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. */