diff options
| author | Eric Biggers <ebiggers@google.com> | 2019-02-22 16:36:18 +0100 |
|---|---|---|
| committer | James Morris <james.morris@microsoft.com> | 2019-02-22 19:11:34 +0100 |
| commit | ede0fa98a900e657d1fcd80b50920efc896c1a4c (patch) | |
| tree | 6bb852b833c21e0e57fb4de6c67d0755fde4d53d /security/keys/proc.c | |
| parent | KEYS: user: Align the payload buffer (diff) | |
| download | linux-ede0fa98a900e657d1fcd80b50920efc896c1a4c.tar.xz linux-ede0fa98a900e657d1fcd80b50920efc896c1a4c.zip | |
KEYS: always initialize keyring_index_key::desc_len
syzbot hit the 'BUG_ON(index_key->desc_len == 0);' in __key_link_begin()
called from construct_alloc_key() during sys_request_key(), because the
length of the key description was never calculated.
The problem is that we rely on ->desc_len being initialized by
search_process_keyrings(), specifically by search_nested_keyrings().
But, if the process isn't subscribed to any keyrings that never happens.
Fix it by always initializing keyring_index_key::desc_len as soon as the
description is set, like we already do in some places.
The following program reproduces the BUG_ON() when it's run as root and
no session keyring has been installed. If it doesn't work, try removing
pam_keyinit.so from /etc/pam.d/login and rebooting.
#include <stdlib.h>
#include <unistd.h>
#include <keyutils.h>
int main(void)
{
int id = add_key("keyring", "syz", NULL, 0, KEY_SPEC_USER_KEYRING);
keyctl_setperm(id, KEY_OTH_WRITE);
setreuid(5000, 5000);
request_key("user", "desc", "", id);
}
Reported-by: syzbot+ec24e95ea483de0a24da@syzkaller.appspotmail.com
Fixes: b2a4df200d57 ("KEYS: Expand the capacity of a keyring")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: James Morris <james.morris@microsoft.com>
Diffstat (limited to 'security/keys/proc.c')
| -rw-r--r-- | security/keys/proc.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/security/keys/proc.c b/security/keys/proc.c index d2b802072693..78ac305d715e 100644 --- a/security/keys/proc.c +++ b/security/keys/proc.c @@ -165,8 +165,7 @@ static int proc_keys_show(struct seq_file *m, void *v) int rc; struct keyring_search_context ctx = { - .index_key.type = key->type, - .index_key.description = key->description, + .index_key = key->index_key, .cred = m->file->f_cred, .match_data.cmp = lookup_user_key_possessed, .match_data.raw_data = key, |