[PATCH ghak57 V2] selinux: format all invalid context as untrusted

[PATCH ghak57 V2] selinux: format all invalid context as untrusted

[Richard Guy Briggs]

The userspace tools expect all fields of the same name to be logged
consistently with the same encoding.  Since the invalid_context fields
contain untrusted strings in selinux_inode_setxattr()
and selinux_setprocattr(), encode all instances of this field the same
way as though they were untrusted even though
compute_sid_handle_invalid_context() and security_sid_mls_copy() are
trusted.

Please see github issue
https://github.com/linux-audit/audit-kernel/issues/57

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
 security/selinux/ss/services.c | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index cc043bc8fd4c..a1c89ac22f1d 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1588,6 +1588,7 @@ static int compute_sid_handle_invalid_context(
 	struct policydb *policydb = &state->ss->policydb;
 	char *s = NULL, *t = NULL, *n = NULL;
 	u32 slen, tlen, nlen;
+	struct audit_buffer *ab;
 
 	if (context_struct_to_string(policydb, scontext, &s, &slen))
 		goto out;
@@ -1595,12 +1596,14 @@ static int compute_sid_handle_invalid_context(
 		goto out;
 	if (context_struct_to_string(policydb, newcontext, &n, &nlen))
 		goto out;
-	audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR,
-		  "op=security_compute_sid invalid_context=%s"
-		  " scontext=%s"
-		  " tcontext=%s"
-		  " tclass=%s",
-		  n, s, t, sym_name(policydb, SYM_CLASSES, tclass-1));
+	ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR);
+	audit_log_format(ab,
+			 "op=security_compute_sid invalid_context=");
+	/* no need to record the NUL with untrusted strings */
+	audit_log_n_untrustedstring(ab, n, nlen - 1);
+	audit_log_format(ab, " scontext=%s tcontext=%s tclass=%s",
+			 s, t, sym_name(policydb, SYM_CLASSES, tclass-1));
+	audit_log_end(ab);
 out:
 	kfree(s);
 	kfree(t);
@@ -3007,10 +3010,16 @@ int security_sid_mls_copy(struct selinux_state *state,
 		if (rc) {
 			if (!context_struct_to_string(policydb, &newcon, &s,
 						      &len)) {
-				audit_log(audit_context(),
-					  GFP_ATOMIC, AUDIT_SELINUX_ERR,
-					  "op=security_sid_mls_copy "
-					  "invalid_context=%s", s);
+				struct audit_buffer *ab;
+
+				ab = audit_log_start(audit_context(),
+						     GFP_ATOMIC,
+						     AUDIT_SELINUX_ERR);
+				audit_log_format(ab,
+						 "op=security_sid_mls_copy invalid_context=");
+				/* don't record NUL with untrusted strings */
+				audit_log_n_untrustedstring(ab, s, len - 1);
+				audit_log_end(ab);
 				kfree(s);
 			}
 			goto out_unlock;
-- 
1.8.3.1

Re: [PATCH ghak57 V2] selinux: format all invalid context as untrusted

[Paul Moore]

On Thu, Jun 27, 2019 at 12:48 PM Richard Guy Briggs <rgb@redhat.com> wrote:
>
> The userspace tools expect all fields of the same name to be logged
> consistently with the same encoding.  Since the invalid_context fields
> contain untrusted strings in selinux_inode_setxattr()
> and selinux_setprocattr(), encode all instances of this field the same
> way as though they were untrusted even though
> compute_sid_handle_invalid_context() and security_sid_mls_copy() are
> trusted.
>
> Please see github issue
> https://github.com/linux-audit/audit-kernel/issues/57
>
> Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
> ---
>  security/selinux/ss/services.c | 29 +++++++++++++++++++----------
>  1 file changed, 19 insertions(+), 10 deletions(-)

Generally rc6/rc7 is a bit late for things, but this is pretty
straightforward so I think it should be safe.  Merged into
selinux/next.

-- 
paul moore
www.paul-moore.com