From ec9f2006fc020c58f32f01b9d68fdb5f7374ffce Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Mon, 6 Jul 2015 19:11:03 +0800 Subject: [PATCH] crypto: cryptd - Fix AEAD request context corruption The AEAD version of cryptd uses the same context for its own state as well as that of the child. In doing so it did not maintain the proper ordering, thus resulting in potential state corruption where the child will overwrite the state stored by cryptd. This patch fixes and also sets the request size properly. Signed-off-by: Herbert Xu --- crypto/cryptd.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/crypto/cryptd.c b/crypto/cryptd.c index 22ba81f76764..2f833dcc1711 100644 --- a/crypto/cryptd.c +++ b/crypto/cryptd.c @@ -688,16 +688,18 @@ static void cryptd_aead_crypt(struct aead_request *req, int (*crypt)(struct aead_request *req)) { struct cryptd_aead_request_ctx *rctx; + crypto_completion_t compl; + rctx = aead_request_ctx(req); + compl = rctx->complete; if (unlikely(err == -EINPROGRESS)) goto out; aead_request_set_tfm(req, child); err = crypt( req ); - req->base.complete = rctx->complete; out: local_bh_disable(); - rctx->complete(&req->base, err); + compl(&req->base, err); local_bh_enable(); } @@ -756,7 +758,9 @@ static int cryptd_aead_init_tfm(struct crypto_aead *tfm) return PTR_ERR(cipher); ctx->child = cipher; - crypto_aead_set_reqsize(tfm, sizeof(struct cryptd_aead_request_ctx)); + crypto_aead_set_reqsize( + tfm, max((unsigned)sizeof(struct cryptd_aead_request_ctx), + crypto_aead_reqsize(cipher))); return 0; } @@ -775,7 +779,7 @@ static int cryptd_create_aead(struct crypto_template *tmpl, struct aead_alg *alg; const char *name; u32 type = 0; - u32 mask = 0; + u32 mask = CRYPTO_ALG_ASYNC; int err; cryptd_check_internal(tb, &type, &mask); -- 2.20.1