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| author | David Howells <dhowells@redhat.com> | 2015-10-19 11:20:28 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2015-10-19 11:24:51 +0100 |
| commit | 911b79cde95c7da0ec02f48105358a36636b7a71 (patch) | |
| tree | 623ed8957cae8115b835018968fec344fba9677d /security | |
| parent | f05819df10d7b09f6d1eb6f8534a8f68e5a4fe61 (diff) | |
| download | lwn-911b79cde95c7da0ec02f48105358a36636b7a71.tar.gz lwn-911b79cde95c7da0ec02f48105358a36636b7a71.zip | |
KEYS: Don't permit request_key() to construct a new keyring
If request_key() is used to find a keyring, only do the search part - don't
do the construction part if the keyring was not found by the search. We
don't really want keyrings in the negative instantiated state since the
rejected/negative instantiation error value in the payload is unioned with
keyring metadata.
Now the kernel gives an error:
request_key("keyring", "#selinux,bdekeyring", "keyring", KEY_SPEC_USER_SESSION_KEYRING) = -1 EPERM (Operation not permitted)
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/keys/request_key.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/security/keys/request_key.c b/security/keys/request_key.c index 486ef6fa393b..0d6253124278 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -440,6 +440,9 @@ static struct key *construct_key_and_link(struct keyring_search_context *ctx, kenter(""); + if (ctx->index_key.type == &key_type_keyring) + return ERR_PTR(-EPERM); + user = key_user_lookup(current_fsuid()); if (!user) return ERR_PTR(-ENOMEM); |