lkml.org 
[lkml]   [2011]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] Set cred->user_ns in key_replace_session_keyring
Since this cred was not created with copy_creds(), it needs to get
initialized. Otherwise use of syscall(__NR_keyctl, KEYCTL_SESSION_TO_PARENT);
can lead to a NULL deref. Thanks to Robert for finding this.

Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Reported-by: Robert Święcki <robert@swiecki.net>
Cc: David Howells <dhowells@redhat.com>
---
security/keys/process_keys.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 6c0480d..92a3a5d 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -847,6 +847,7 @@ void key_replace_session_keyring(void)
new-> sgid = old-> sgid;
new->fsgid = old->fsgid;
new->user = get_uid(old->user);
+ new->user_ns = new->user->user_ns;
new->group_info = get_group_info(old->group_info);

new->securebits = old->securebits;
--
1.7.0.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2011-05-26 22:27    [from the cache]
©2003-2011 Jasper Spaans