From: Douya Le <ldy3087146292@gmail.com> stable inclusion from stable-v6.6.137 commit c2138c9bd02af19e0b407376140cd5435b0d81da category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/14174 CVE: CVE-2026-31431 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 5aa58c3a572b3e3b6c786953339f7978b845cc52 upstream. AF_ALG AEAD AIO requests currently use the socket-wide IV buffer during request processing. For async requests, later socket activity can update that shared state before the original request has fully completed, which can lead to inconsistent IV handling. Snapshot the IV into per-request storage when preparing the AEAD request, so in-flight operations no longer depend on mutable socket state. Fixes: d887c52d6ae4 ("crypto: algif_aead - overhaul memory management") Cc: stable@kernel.org Reported-by: Yuan Tan <yuantan098@gmail.com> Reported-by: Yifan Wu <yifanwucs@gmail.com> Reported-by: Juefei Pu <tomapufckgml@gmail.com> Reported-by: Xin Liu <bird@lzu.edu.cn> Co-developed-by: Luxing Yin <tr0jan@lzu.edu.cn> Signed-off-by: Luxing Yin <tr0jan@lzu.edu.cn> Tested-by: Yucheng Lu <kanolyc@gmail.com> Signed-off-by: Douya Le <ldy3087146292@gmail.com> Signed-off-by: Ren Wei <n05ec@lzu.edu.cn> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Eric Biggers <ebiggers@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Lu Jialin <lujialin4@huawei.com> --- crypto/algif_aead.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/crypto/algif_aead.c b/crypto/algif_aead.c index f8bd45f7dc83..cb651ab58d62 100644 --- a/crypto/algif_aead.c +++ b/crypto/algif_aead.c @@ -72,8 +72,10 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg, struct af_alg_ctx *ctx = ask->private; struct crypto_aead *tfm = pask->private; unsigned int as = crypto_aead_authsize(tfm); + unsigned int ivsize = crypto_aead_ivsize(tfm); struct af_alg_async_req *areq; struct scatterlist *rsgl_src, *tsgl_src = NULL; + void *iv; int err = 0; size_t used = 0; /* [in] TX bufs to be en/decrypted */ size_t outlen = 0; /* [out] RX bufs produced by kernel */ @@ -125,10 +127,14 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg, /* Allocate cipher request for current operation. */ areq = af_alg_alloc_areq(sk, sizeof(struct af_alg_async_req) + - crypto_aead_reqsize(tfm)); + crypto_aead_reqsize(tfm) + ivsize); if (IS_ERR(areq)) return PTR_ERR(areq); + iv = (u8 *)aead_request_ctx(&areq->cra_u.aead_req) + + crypto_aead_reqsize(tfm); + memcpy(iv, ctx->iv, ivsize); + /* convert iovecs of output buffers into RX SGL */ err = af_alg_get_rsgl(sk, msg, flags, areq, outlen, &usedpages); if (err) @@ -187,7 +193,7 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg, /* Initialize the crypto operation */ aead_request_set_crypt(&areq->cra_u.aead_req, tsgl_src, - areq->first_rsgl.sgl.sgt.sgl, used, ctx->iv); + areq->first_rsgl.sgl.sgt.sgl, used, iv); aead_request_set_ad(&areq->cra_u.aead_req, ctx->aead_assoclen); aead_request_set_tfm(&areq->cra_u.aead_req, tfm); -- 2.34.1