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KEYS/DNS: Fix ____call_usermodehelper() to not lose the session keyring

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____call_usermodehelper() now erases any credentials set by the
subprocess_inf::init() function.  The problem is that commit
17f60a7da1 ("capabilites: allow the application of capability limits
to usermode helpers") creates and commits new credentials with
prepare_kernel_cred() after the call to the init() function.  This wipes
all keyrings after umh_keys_init() is called.

The best way to deal with this is to put the init() call just prior to
the commit_creds() call, and pass the cred pointer to init().  That
means that umh_keys_init() and suchlike can modify the credentials
_before_ they are published and potentially in use by the rest of the
system.

This prevents request_key() from working as it is prevented from passing
the session keyring it set up with the authorisation token to
/sbin/request-key, and so the latter can't assume the authority to
instantiate the key.  This causes the in-kernel DNS resolver to fail
with ENOKEY unconditionally.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Eric Paris <eparis@redhat.com>
Tested-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells
2011-06-17 11:25:59 +01:00
committed by Linus Torvalds
parent eb96c92515
commit 879669961b
4 changed files with 15 additions and 14 deletions
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3
security/keys/request_key.c
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@@ -71,9 +71,8 @@ EXPORT_SYMBOL(complete_request_key);
* This is called in context of freshly forked kthread before kernel_execve(),
* so we can simply install the desired session_keyring at this point.
*/
static int umh_keys_init(struct subprocess_info *info)
static int umh_keys_init(struct subprocess_info *info, struct cred *cred)
{
struct cred *cred = (struct cred*)current_cred();
struct key *keyring = info->data;
return install_session_keyring_to_cred(cred, keyring);