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[PATCH] Keys: Base keyring size on key pointer not key struct

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The attached patch makes the keyring functions calculate the new size of a
keyring's payload based on the size of pointer to the key struct, not the size
of the key struct itself.

Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Howells 2005-07-07 17:57:03 -07:00 committed by Linus Torvalds
parent 682d4fc931
commit a4014d8f61
1 changed files with 8 additions and 7 deletions
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15
security/keys/keyring.c
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@ -129,7 +129,7 @@ static int keyring_duplicate(struct key *keyring, const struct key *source)
int loop, ret;
const unsigned limit =
(PAGE_SIZE - sizeof(*klist)) / sizeof(struct key);
(PAGE_SIZE - sizeof(*klist)) / sizeof(struct key *);
ret = 0;
@ -150,7 +150,7 @@ static int keyring_duplicate(struct key *keyring, const struct key *source)
max = limit;
ret = -ENOMEM;
size = sizeof(*klist) + sizeof(struct key) * max;
size = sizeof(*klist) + sizeof(struct key *) * max;
klist = kmalloc(size, GFP_KERNEL);
if (!klist)
goto error;
@ -163,7 +163,7 @@ static int keyring_duplicate(struct key *keyring, const struct key *source)
klist->nkeys = sklist->nkeys;
memcpy(klist->keys,
sklist->keys,
sklist->nkeys * sizeof(struct key));
sklist->nkeys * sizeof(struct key *));
for (loop = klist->nkeys - 1; loop >= 0; loop--)
atomic_inc(&klist->keys[loop]->usage);
@ -783,7 +783,7 @@ int __key_link(struct key *keyring, struct key *key)
ret = -ENFILE;
if (max > 65535)
goto error3;
size = sizeof(*klist) + sizeof(*key) * max;
size = sizeof(*klist) + sizeof(struct key *) * max;
if (size > PAGE_SIZE)
goto error3;
@ -895,7 +895,8 @@ int key_unlink(struct key *keyring, struct key *key)
key_is_present:
/* we need to copy the key list for RCU purposes */
nklist = kmalloc(sizeof(*klist) + sizeof(*key) * klist->maxkeys,
nklist = kmalloc(sizeof(*klist) +
sizeof(struct key *) * klist->maxkeys,
GFP_KERNEL);
if (!nklist)
goto nomem;
@ -905,12 +906,12 @@ int key_unlink(struct key *keyring, struct key *key)
if (loop > 0)
memcpy(&nklist->keys[0],
&klist->keys[0],
loop * sizeof(klist->keys[0]));
loop * sizeof(struct key *));
if (loop < nklist->nkeys)
memcpy(&nklist->keys[loop],
&klist->keys[loop + 1],
(nklist->nkeys - loop) * sizeof(klist->keys[0]));
(nklist->nkeys - loop) * sizeof(struct key *));
/* adjust the user's quota */
key_payload_reserve(keyring,