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crypto: algif_aead - Only wake up when ctx->more is zero

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AEAD does not support partial requests so we must not wake up
while ctx->more is set.  In order to distinguish between the
case of no data sent yet and a zero-length request, a new init
flag has been added to ctx.

SKCIPHER has also been modified to ensure that at least a block
of data is available if there is more data to come.

Fixes: 2d97591ef4 ("crypto: af_alg - consolidation of...")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
2020-05-30 00:23:49 +10:00
parent 1532e31f50
commit f3c802a1f3
4 changed files with 15 additions and 8 deletions
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11
crypto/af_alg.c
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@@ -635,6 +635,7 @@ void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst,
if (!ctx->used)
ctx->merge = 0;
ctx->init = ctx->more;
}
EXPORT_SYMBOL_GPL(af_alg_pull_tsgl);
@@ -734,9 +735,10 @@ EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup);
*
* @sk socket of connection to user space
* @flags If MSG_DONTWAIT is set, then only report if function would sleep
* @min Set to minimum request size if partial requests are allowed.
* @return 0 when writable memory is available, < 0 upon error
*/
int af_alg_wait_for_data(struct sock *sk, unsigned flags)
int af_alg_wait_for_data(struct sock *sk, unsigned flags, unsigned min)
{
DEFINE_WAIT_FUNC(wait, woken_wake_function);
struct alg_sock *ask = alg_sk(sk);
@@ -754,7 +756,9 @@ int af_alg_wait_for_data(struct sock *sk, unsigned flags)
if (signal_pending(current))
break;
timeout = MAX_SCHEDULE_TIMEOUT;
if (sk_wait_event(sk, &timeout, (ctx->used || !ctx->more),
if (sk_wait_event(sk, &timeout,
ctx->init && (!ctx->more ||
(min && ctx->used >= min)),
&wait)) {
err = 0;
break;
@@ -843,7 +847,7 @@ int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size,
}
lock_sock(sk);
if (!ctx->more && ctx->used) {
if (ctx->init && (init || !ctx->more)) {
err = -EINVAL;
goto unlock;
}
@@ -854,6 +858,7 @@ int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size,
memcpy(ctx->iv, con.iv->iv, ivsize);
ctx->aead_assoclen = con.aead_assoclen;
ctx->init = true;
}
while (size) {