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David Howells db1a0b94ba KEYS: Fix bug in keyctl_session_to_parent() if parent has no session keyring 
commit 3d96406c7d 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 <taviso@cmpxchg8b.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Tavis Ormandy <taviso@cmpxchg8b.com>
Cc: dann frazier <dannf@debian.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-09-26 17:21:30 -07:00
..
integrity/ima ima: replace GFP_KERNEL with GFP_NOFS 2009-11-19 08:42:01 +11:00
keys KEYS: Fix bug in keyctl_session_to_parent() if parent has no session keyring 2010-09-26 17:21:30 -07:00
selinux netlabel: fix export of SELinux categories > 127 2010-03-15 08:49:34 -07:00
smack seq_file: constify seq_operations 2009-09-23 07:39:29 -07:00
tomoyo KEYS: Add a keyctl to install a process's session keyring on its parent [try #6] 2009-09-02 21:29:22 +10:00
capability.c LSM/SELinux: inode_{get,set,notify}secctx hooks to access LSM security context information. 2009-09-10 10:11:24 +10:00
commoncap.c Security/SELinux: seperate lsm specific mmap_min_addr 2009-08-17 15:09:11 +10:00
device_cgroup.c cgroups: let ss->can_attach and ss->attach do whole threadgroups at a time 2009-09-24 07:20:58 -07:00
inode.c security: testing the wrong variable in create_by_name() 2010-05-12 14:57:14 -07:00
Kconfig Merge commit 'v2.6.31-rc8' into x86/txt 2009-09-02 08:17:56 +02:00
lsm_audit.c lsm: Use a compressed IPv6 string format in audit events 2009-09-24 03:50:26 -04:00
Makefile NOMMU: Optimise away the {dac_,}mmap_min_addr tests 2010-01-06 15:04:30 -08:00
min_addr.c mmap_min_addr check CAP_SYS_RAWIO only for write 2010-05-26 14:29:21 -07:00
root_plug.c rootplug: Remove redundant initialization. 2009-05-27 13:30:46 +10:00
security.c LSM/SELinux: inode_{get,set,notify}secctx hooks to access LSM security context information. 2009-09-10 10:11:24 +10:00