[SRU][Trusty][PATCH 1/1] KEYS: fix dereferencing NULL payload with nonzero length

Kleber Sacilotto de Souza kleber.souza at canonical.com
Thu Dec 7 17:59:56 UTC 2017

From: Eric Biggers <ebiggers at google.com>

sys_add_key() and the KEYCTL_UPDATE operation of sys_keyctl() allowed a
NULL payload with nonzero length to be passed to the key type's
->preparse(), ->instantiate(), and/or ->update() methods.  Various key
types including asymmetric, cifs.idmap, cifs.spnego, and pkcs7_test did
not handle this case, allowing an unprivileged user to trivially cause a
NULL pointer dereference (kernel oops) if one of these key types was
present.  Fix it by doing the copy_from_user() when 'plen' is nonzero
rather than when '_payload' is non-NULL, causing the syscall to fail
with EFAULT as expected when an invalid buffer is specified.

Cc: stable at vger.kernel.org # 2.6.10+
Signed-off-by: Eric Biggers <ebiggers at google.com>
Signed-off-by: David Howells <dhowells at redhat.com>
Signed-off-by: James Morris <james.l.morris at oracle.com>

(backported from commit 5649645d725c73df4302428ee4e02c869248b4c5)
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>
 security/keys/keyctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 4e3fecc72f43..e4bb9adf7a76 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -93,7 +93,7 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type,
 	payload = NULL;
 	vm = false;
-	if (_payload) {
+	if (plen) {
 		ret = -ENOMEM;
 		payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN);
 		if (!payload) {
@@ -327,7 +327,7 @@ long keyctl_update_key(key_serial_t id,
 	/* pull the payload in if one was supplied */
 	payload = NULL;
-	if (_payload) {
+	if (plen) {
 		ret = -ENOMEM;
 		payload = kmalloc(plen, GFP_KERNEL);
 		if (!payload)

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