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crypto: af_alg - Disallow multiple in-flight AIO requests

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Having multiple in-flight AIO requests results in unpredictable
output because they all share the same IV.  Fix this by only allowing
one request at a time.

Fixes: 83094e5e9e ("crypto: af_alg - add async support to algif_aead")
Fixes: a596999b7d ("crypto: algif - change algif_skcipher to be asynchronous")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2023-11-28 16:25:49 +08:00
parent 431a2eb89c
commit 67b164a871
2 changed files with 16 additions and 1 deletions
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14
crypto/af_alg.c
View File

@ -1116,9 +1116,13 @@ EXPORT_SYMBOL_GPL(af_alg_sendmsg);
void af_alg_free_resources(struct af_alg_async_req *areq)
{
struct sock *sk = areq->sk;
struct af_alg_ctx *ctx;
af_alg_free_areq_sgls(areq);
sock_kfree_s(sk, areq, areq->areqlen);
ctx = alg_sk(sk)->private;
ctx->inflight = false;
}
EXPORT_SYMBOL_GPL(af_alg_free_resources);
@ -1188,11 +1192,19 @@ EXPORT_SYMBOL_GPL(af_alg_poll);
struct af_alg_async_req *af_alg_alloc_areq(struct sock *sk,
unsigned int areqlen)
{
struct af_alg_async_req *areq = sock_kmalloc(sk, areqlen, GFP_KERNEL);
struct af_alg_ctx *ctx = alg_sk(sk)->private;
struct af_alg_async_req *areq;
/* Only one AIO request can be in flight. */
if (ctx->inflight)
return ERR_PTR(-EBUSY);
areq = sock_kmalloc(sk, areqlen, GFP_KERNEL);
if (unlikely(!areq))
return ERR_PTR(-ENOMEM);
ctx->inflight = true;
areq->areqlen = areqlen;
areq->sk = sk;
areq->first_rsgl.sgl.sgt.sgl = areq->first_rsgl.sgl.sgl;

3
include/crypto/if_alg.h
View File

@ -136,6 +136,7 @@ struct af_alg_async_req {
* recvmsg is invoked.
* @init: True if metadata has been sent.
* @len: Length of memory allocated for this data structure.
* @inflight: Non-zero when AIO requests are in flight.
*/
struct af_alg_ctx {
struct list_head tsgl_list;
@ -154,6 +155,8 @@ struct af_alg_ctx {
bool init;
unsigned int len;
unsigned int inflight;
};
int af_alg_register_type(const struct af_alg_type *type);