6.6-stable review patch. If anyone has any objections, please let me know.
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From: Shivani Agarwal shivani.agarwal@broadcom.com
commit 6f6e309328d53a10c0fe1f77dec2db73373179b6 upstream.
Several crypto user API contexts and requests allocated with sock_kmalloc() were left uninitialized, relying on callers to set fields explicitly. This resulted in the use of uninitialized data in certain error paths or when new fields are added in the future.
The ACVP patches also contain two user-space interface files: algif_kpp.c and algif_akcipher.c. These too rely on proper initialization of their context structures.
A particular issue has been observed with the newly added 'inflight' variable introduced in af_alg_ctx by commit:
67b164a871af ("crypto: af_alg - Disallow multiple in-flight AIO requests")
Because the context is not memset to zero after allocation, the inflight variable has contained garbage values. As a result, af_alg_alloc_areq() has incorrectly returned -EBUSY randomly when the garbage value was interpreted as true:
https://github.com/gregkh/linux/blame/master/crypto/af_alg.c#L1209
The check directly tests ctx->inflight without explicitly comparing against true/false. Since inflight is only ever set to true or false later, an uninitialized value has triggered -EBUSY failures. Zero-initializing memory allocated with sock_kmalloc() ensures inflight and other fields start in a known state, removing random issues caused by uninitialized data.
Fixes: fe869cdb89c9 ("crypto: algif_hash - User-space interface for hash operations") Fixes: 5afdfd22e6ba ("crypto: algif_rng - add random number generator support") Fixes: 2d97591ef43d ("crypto: af_alg - consolidation of duplicate code") Fixes: 67b164a871af ("crypto: af_alg - Disallow multiple in-flight AIO requests") Cc: stable@vger.kernel.org Signed-off-by: Shivani Agarwal shivani.agarwal@broadcom.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- crypto/af_alg.c | 5 ++--- crypto/algif_hash.c | 3 +-- crypto/algif_rng.c | 3 +-- 3 files changed, 4 insertions(+), 7 deletions(-)
--- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -1211,15 +1211,14 @@ struct af_alg_async_req *af_alg_alloc_ar if (unlikely(!areq)) return ERR_PTR(-ENOMEM);
+ memset(areq, 0, areqlen); + ctx->inflight = true;
areq->areqlen = areqlen; areq->sk = sk; areq->first_rsgl.sgl.sgt.sgl = areq->first_rsgl.sgl.sgl; - areq->last_rsgl = NULL; INIT_LIST_HEAD(&areq->rsgl_list); - areq->tsgl = NULL; - areq->tsgl_entries = 0;
return areq; } --- a/crypto/algif_hash.c +++ b/crypto/algif_hash.c @@ -416,9 +416,8 @@ static int hash_accept_parent_nokey(void if (!ctx) return -ENOMEM;
- ctx->result = NULL; + memset(ctx, 0, len); ctx->len = len; - ctx->more = false; crypto_init_wait(&ctx->wait);
ask->private = ctx; --- a/crypto/algif_rng.c +++ b/crypto/algif_rng.c @@ -248,9 +248,8 @@ static int rng_accept_parent(void *priva if (!ctx) return -ENOMEM;
+ memset(ctx, 0, len); ctx->len = len; - ctx->addtl = NULL; - ctx->addtl_len = 0;
/* * No seeding done at that point -- if multiple accepts are