[lkml]   [2010]   [Sep]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[63/80] KEYS: Fix bug in keyctl_session_to_parent() if parent has no session keyring
2.6.35-stable review patch.  If anyone has any objections, please let us know.


From: David Howells <>

commit 3d96406c7da1ed5811ea52a3b0905f4f0e295376 upstream.

Fix a bug in keyctl_session_to_parent() whereby it tries to check the ownership
of the parent process's session keyring whether or not the parent has a session
keyring [CVE-2010-2960].

This results in the following oops:

BUG: unable to handle kernel NULL pointer dereference at 00000000000000a0
IP: [<ffffffff811ae4dd>] keyctl_session_to_parent+0x251/0x443
Call Trace:
[<ffffffff811ae2f3>] ? keyctl_session_to_parent+0x67/0x443
[<ffffffff8109d286>] ? __do_fault+0x24b/0x3d0
[<ffffffff811af98c>] sys_keyctl+0xb4/0xb8
[<ffffffff81001eab>] system_call_fastpath+0x16/0x1b

if the parent process has no session keyring.

If the system is using pam_keyinit then it mostly protected against this as all
processes derived from a login will have inherited the session keyring created
by pam_keyinit during the log in procedure.

To test this, pam_keyinit calls need to be commented out in /etc/pam.d/.

Reported-by: Tavis Ormandy <>
Signed-off-by: David Howells <>
Acked-by: Tavis Ormandy <>
Cc: dann frazier <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Greg Kroah-Hartman <>

security/keys/keyctl.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1292,7 +1292,8 @@ long keyctl_session_to_parent(void)
goto not_permitted;

/* the keyrings must have the same UID */
- if (pcred->tgcred->session_keyring->uid != mycred->euid ||
+ if ((pcred->tgcred->session_keyring &&
+ pcred->tgcred->session_keyring->uid != mycred->euid) ||
mycred->tgcred->session_keyring->uid != mycred->euid)
goto not_permitted;

 \ /
  Last update: 2010-09-27 20:09    [W:0.196 / U:3.612 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site