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| author | David Howells <dhowells@redhat.com> | 2011-01-25 19:34:28 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-26 01:58:20 +0300 |
| commit | ceb73c12047b8d543570b23353e7848eb7c540a1 (patch) | |
| tree | a637dc88d418be1b705a66bea375af955bd14e22 /security/keys/key.c | |
| parent | f5c66d70ac2a9016a7ad481bd37e39afd7dd7369 (diff) | |
| download | linux-ceb73c12047b8d543570b23353e7848eb7c540a1.tar.xz | |
KEYS: Fix __key_link_end() quota fixup on error
Fix __key_link_end()'s attempt to fix up the quota if an error occurs.
There are two erroneous cases: Firstly, we always decrease the quota if
the preallocated replacement keyring needs cleaning up, irrespective of
whether or not we should (we may have replaced a pointer rather than
adding another pointer).
Secondly, we never clean up the quota if we added a pointer without the
keyring storage being extended (we allocate multiple pointers at a time,
even if we're not going to use them all immediately).
We handle this by setting the bottom bit of the preallocation pointer in
__key_link_begin() to indicate that the quota needs fixing up, which is
then passed to __key_link() (which clears the whole thing) and
__key_link_end().
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security/keys/key.c')
| -rw-r--r-- | security/keys/key.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/security/keys/key.c b/security/keys/key.c index 84d4eb568b08..1c2d43dc5107 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -415,7 +415,7 @@ static int __key_instantiate_and_link(struct key *key, size_t datalen, struct key *keyring, struct key *authkey, - struct keyring_list **_prealloc) + unsigned long *_prealloc) { int ret, awaken; @@ -481,7 +481,7 @@ int key_instantiate_and_link(struct key *key, struct key *keyring, struct key *authkey) { - struct keyring_list *prealloc; + unsigned long prealloc; int ret; if (keyring) { @@ -526,7 +526,7 @@ int key_negate_and_link(struct key *key, struct key *keyring, struct key *authkey) { - struct keyring_list *prealloc; + unsigned long prealloc; struct timespec now; int ret, awaken, link_ret = 0; @@ -814,7 +814,7 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref, key_perm_t perm, unsigned long flags) { - struct keyring_list *prealloc; + unsigned long prealloc; const struct cred *cred = current_cred(); struct key_type *ktype; struct key *keyring, *key = NULL; |