selinux: fix labeling of /proc/net inodes

The proc net rewrite had a side effect on selinux, leading it to mislabel
the /proc/net inodes, thereby leading to incorrect denials.  Fix
security_genfs_sid to ignore extra leading / characters in the path supplied
by selinux_proc_get_sid since we now get "//net/..." rather than "/net/...".

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index f83b19daed16..4bf715d4cf29 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1744,6 +1744,9 @@ int security_genfs_sid(const char *fstype,
         struct ocontext *c;
         int rc = 0, cmp = 0;
 
+        while (path[0] == '/' && path[1] == '/')
+                path++;
+
         POLICY_RDLOCK;
 
         for (genfs = policydb.genfs; genfs; genfs = genfs->next) {