On Tue, Jan 30, 2024 at 07:27:40PM +0800, zhenwei pi wrote: > sizeof(struct virtio_crypto_akcipher_session_para) is less than > sizeof(struct virtio_crypto_op_ctrl_req::u), copying more bytes from > stack variable leads stack overflow. Clang reports this issue by > commands: > make -j CC=clang-14 mrproper >/dev/null 2>&1 > make -j O=/tmp/crypto-build CC=clang-14 allmodconfig >/dev/null 2>&1 > make -j O=/tmp/crypto-build W=1 CC=clang-14 drivers/crypto/virtio/ > virtio_crypto_akcipher_algs.o > > Fixes: 59ca6c93387d ("virtio-crypto: implement RSA algorithm") > Link: https://lore.kernel.org/all/0a194a79-e3a3-45e7-be98-83abd3e1cb7e@xxxxxxxxxxxx/ > Signed-off-by: zhenwei pi <pizhenwei@xxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx> > --- > drivers/crypto/virtio/virtio_crypto_akcipher_algs.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c > index 2621ff8a9376..de53eddf6796 100644 > --- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c > +++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c > @@ -104,7 +104,8 @@ static void virtio_crypto_dataq_akcipher_callback(struct virtio_crypto_request * > } > > static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher_ctx *ctx, > - struct virtio_crypto_ctrl_header *header, void *para, > + struct virtio_crypto_ctrl_header *header, > + struct virtio_crypto_akcipher_session_para *para, > const uint8_t *key, unsigned int keylen) > { > struct scatterlist outhdr_sg, key_sg, inhdr_sg, *sgs[3]; > @@ -128,7 +129,7 @@ static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher > > ctrl = &vc_ctrl_req->ctrl; > memcpy(&ctrl->header, header, sizeof(ctrl->header)); > - memcpy(&ctrl->u, para, sizeof(ctrl->u)); > + memcpy(&ctrl->u.akcipher_create_session.para, para, sizeof(*para)); > input = &vc_ctrl_req->input; > input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR); > > -- > 2.34.1