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Commit 3239b6f2 authored by Eric Biggers's avatar Eric Biggers Committed by James Morris
Browse files

KEYS: return full count in keyring_read() if buffer is too small 



Commit e645016a ("KEYS: fix writing past end of user-supplied buffer
in keyring_read()") made keyring_read() stop corrupting userspace memory
when the user-supplied buffer is too small.  However it also made the
return value in that case be the short buffer size rather than the size
required, yet keyctl_read() is actually documented to return the size
required.  Therefore, switch it over to the documented behavior.

Note that for now we continue to have it fill the short buffer, since it
did that before (pre-v3.13) and dump_key_tree_aux() in keyutils arguably
relies on it.

Fixes: e645016a ("KEYS: fix writing past end of user-supplied buffer in keyring_read()")
Reported-by: default avatarBen Hutchings <ben@decadent.org.uk>
Cc: <stable@vger.kernel.org> # v3.13+
Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Reviewed-by: default avatarJames Morris <james.l.morris@oracle.com>
Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
parent 3a99df9a

security/keys/keyring.c

+19 −20
Original line number Diff line number Diff line
@@ -459,34 +459,33 @@ static long keyring_read(const struct key *keyring, 
			 char __user *buffer, size_t buflen)

{

	struct keyring_read_iterator_context ctx;

	unsigned long nr_keys;

	int ret;

	long ret;



	kenter("{%d},,%zu", key_serial(keyring), buflen);



	if (buflen & (sizeof(key_serial_t) - 1))

		return -EINVAL;



	nr_keys = keyring->keys.nr_leaves_on_tree;

	if (nr_keys == 0)

		return 0;



	/* Calculate how much data we could return */

	if (!buffer || !buflen)

		return nr_keys * sizeof(key_serial_t);



	/* Copy the IDs of the subscribed keys into the buffer */

	/* Copy as many key IDs as fit into the buffer */

	if (buffer && buflen) {

		ctx.buffer = (key_serial_t __user *)buffer;

		ctx.buflen = buflen;

		ctx.count = 0;

	ret = assoc_array_iterate(&keyring->keys, keyring_read_iterator, &ctx);

		ret = assoc_array_iterate(&keyring->keys,

					  keyring_read_iterator, &ctx);

		if (ret < 0) {

		kleave(" = %d [iterate]", ret);

			kleave(" = %ld [iterate]", ret);

			return ret;

		}

	}



	kleave(" = %zu [ok]", ctx.count);

	return ctx.count;

	/* Return the size of the buffer needed */

	ret = keyring->keys.nr_leaves_on_tree * sizeof(key_serial_t);

	if (ret <= buflen)

		kleave("= %ld [ok]", ret);

	else

		kleave("= %ld [buffer too small]", ret);

	return ret;

}



/*