If the callee SID is bounded by the caller SID or if the caller SID is allowed
to perform a dynamic transition (setcon) to the callee SID, then allowing
the transition to occur poses no risk of privilege escalation and we can
therefore safely allow the transition to occur. Add this exemption
for both the case where a transition was explicitly requested by the
application and the case where an automatic transition is defined in
policy.
Signed-off-by: Stephen Smalley <sds@xxxxxxxxxxxxx>
Cc: luto@xxxxxxxxxxxxxx
Cc: paul@xxxxxxxxxxxxxx
---
security/selinux/hooks.c | 59 ++++++++++++++++++++++++++++++++++++++----------
1 file changed, 47 insertions(+), 12 deletions(-)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 83d06db..d96c91a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2086,6 +2086,41 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
/* binprm security operations */
+static int check_nnp_nosuid(const struct linux_binprm *bprm,
+ const struct task_security_struct *old_tsec,
+ const struct task_security_struct *new_tsec)
+{
+ int nnp = (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS);
+ int nosuid = (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID);
+ int rc;
+
+ if (!nnp && !nosuid)
+ return 0; /* neither NNP nor nosuid */
+
+ if (new_tsec->sid == old_tsec->sid)
+ return 0; /* No change in credentials */
+
+ /*
+ * The only transitions we permit under NNP or nosuid
+ * are transitions to bounded SIDs, i.e. SIDs that are
+ * guaranteed to only be allowed a subset of the permissions
+ * of the current SID.
+ */
+ rc = security_bounded_transition(old_tsec->sid, new_tsec->sid);
+ if (rc) {
+ /*
+ * On failure, preserve the errno values for NNP vs nosuid.
+ * NNP: Operation not permitted for caller.
+ * nosuid: Permission denied to file.
+ */
+ if (nnp)
+ return -EPERM;
+ else
+ return -EACCES;
+ }
+ return 0;
+}
+
static int selinux_bprm_set_creds(struct linux_binprm *bprm)
{
const struct task_security_struct *old_tsec;
@@ -2122,14 +2157,10 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
/* Reset exec SID on execve. */
new_tsec->exec_sid = 0;
- /*
- * Minimize confusion: if no_new_privs or nosuid and a
- * transition is explicitly requested, then fail the exec.
- */
- if (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS)
- return -EPERM;
- if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
- return -EACCES;
+ /* Fail on NNP or nosuid if not an allowed transition. */
+ rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
+ if (rc)
+ return rc;
} else {
/* Check for a default transition on this program. */
rc = security_transition_sid(old_tsec->sid, isec->sid,
@@ -2137,15 +2168,19 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
&new_tsec->sid);
if (rc)
return rc;
+
+ /*
+ * Fallback to old SID on NNP or nosuid if not an allowed
+ * transition.
+ */
+ rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
+ if (rc)
+ new_tsec->sid = old_tsec->sid;
}
ad.type = LSM_AUDIT_DATA_PATH;
ad.u.path = bprm->file->f_path;
- if ((bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) ||
- (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS))
- new_tsec->sid = old_tsec->sid;
-
if (new_tsec->sid == old_tsec->sid) {
rc = avc_has_perm(old_tsec->sid, isec->sid,
SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
--
1.8.3.1
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