summaryrefslogtreecommitdiff
path: root/security/selinux/ss
diff options
context:
space:
mode:
authorStephen Smalley <sds@tycho.nsa.gov>2017-02-28 18:35:56 +0300
committerJames Morris <james.l.morris@oracle.com>2017-03-02 02:27:40 +0300
commit2651225b5ebcdde60f684c4db8ec7e9e3800a74f (patch)
tree73c955a7c52dbcbe7320ddb1fc823be6671d0a84 /security/selinux/ss
parent0837e49ab3fa8d903a499984575d71efee8097ce (diff)
downloadlinux-2651225b5ebcdde60f684c4db8ec7e9e3800a74f.tar.xz
selinux: wrap cgroup seclabel support with its own policy capability
commit 1ea0ce40690dff38935538e8dab7b12683ded0d3 ("selinux: allow changing labels for cgroupfs") broke the Android init program, which looks up security contexts whenever creating directories and attempts to assign them via setfscreatecon(). When creating subdirectories in cgroup mounts, this would previously be ignored since cgroup did not support userspace setting of security contexts. However, after the commit, SELinux would attempt to honor the requested context on cgroup directories and fail due to permission denial. Avoid breaking existing userspace/policy by wrapping this change with a conditional on a new cgroup_seclabel policy capability. This preserves existing behavior until/unless a new policy explicitly enables this capability. Reported-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Paul Moore <paul@paul-moore.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'security/selinux/ss')
-rw-r--r--security/selinux/ss/services.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index a70fcee9824b..b4aa491a0a23 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -74,6 +74,7 @@ int selinux_policycap_netpeer;
int selinux_policycap_openperm;
int selinux_policycap_extsockclass;
int selinux_policycap_alwaysnetwork;
+int selinux_policycap_cgroupseclabel;
static DEFINE_RWLOCK(policy_rwlock);
@@ -1993,6 +1994,9 @@ static void security_load_policycaps(void)
POLICYDB_CAPABILITY_EXTSOCKCLASS);
selinux_policycap_alwaysnetwork = ebitmap_get_bit(&policydb.policycaps,
POLICYDB_CAPABILITY_ALWAYSNETWORK);
+ selinux_policycap_cgroupseclabel =
+ ebitmap_get_bit(&policydb.policycaps,
+ POLICYDB_CAPABILITY_CGROUPSECLABEL);
}
static int security_preserve_bools(struct policydb *p);