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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.

But introduced by commit 47a150edc2 ("Cache user_ns in struct cred").

Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Reported-by: Robert Święcki <robert@swiecki.net>
Cc: David Howells <dhowells@redhat.com>
Cc: stable@kernel.org (2.6.39)
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Serge E. Hallyn 2011-05-26 15:25:05 -05:00 committed by Linus Torvalds
parent b7c2f03628
commit f7285b5d63
1 changed files with 1 additions and 0 deletions
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1
security/keys/process_keys.c
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@ -847,6 +847,7 @@ void key_replace_session_keyring(void)
new-> sgid = old-> sgid; new-> sgid = old-> sgid;
new->fsgid = old->fsgid; new->fsgid = old->fsgid;
new->user = get_uid(old->user); new->user = get_uid(old->user);
new->user_ns = new->user->user_ns;
new->group_info = get_group_info(old->group_info); new->group_info = get_group_info(old->group_info);
new->securebits = old->securebits; new->securebits = old->securebits;