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charset="utf-8" Make the Aspeed HACE module use the new qcrypto accumulative hashing functi= ons when in scatter-gather accumulative mode. A hash context will maintain a "running-hash" as each scatter-gather chunk is received. Previously each scatter-gather "chunk" was cached so the hash could be computed once the final chunk was received. However, the cache was a shallow copy, so once the guest overwrote the memory provided to HACE the final hash would not be correct. Possibly related to: https://gitlab.com/qemu-project/qemu/-/issues/1121 Buglink: https://github.com/openbmc/qemu/issues/36 Signed-off-by: Alejandro Zeise Reported-by: John Wang --- hw/misc/aspeed_hace.c | 91 ++++++++++++++++++----------------- include/hw/misc/aspeed_hace.h | 4 ++ 2 files changed, 51 insertions(+), 44 deletions(-) diff --git a/hw/misc/aspeed_hace.c b/hw/misc/aspeed_hace.c index c06c04ddc6..8306d8986a 100644 --- a/hw/misc/aspeed_hace.c +++ b/hw/misc/aspeed_hace.c @@ -1,6 +1,7 @@ /* * ASPEED Hash and Crypto Engine * + * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates * Copyright (C) 2021 IBM Corp. * * Joel Stanley @@ -151,47 +152,15 @@ static int reconstruct_iov(AspeedHACEState *s, struct= iovec *iov, int id, return iov_count; } =20 -/** - * Generate iov for accumulative mode. - * - * @param s aspeed hace state object - * @param iov iov of the current request - * @param id index of the current iov - * @param req_len length of the current request - * - * @return count of iov - */ -static int gen_acc_mode_iov(AspeedHACEState *s, struct iovec *iov, int id, - hwaddr *req_len) -{ - uint32_t pad_offset; - uint32_t total_msg_len; - s->total_req_len +=3D *req_len; - - if (has_padding(s, &iov[id], *req_len, &total_msg_len, &pad_offset)) { - if (s->iov_count) { - return reconstruct_iov(s, iov, id, &pad_offset); - } - - *req_len -=3D s->total_req_len - total_msg_len; - s->total_req_len =3D 0; - iov[id].iov_len =3D *req_len; - } else { - s->iov_cache[s->iov_count].iov_base =3D iov->iov_base; - s->iov_cache[s->iov_count].iov_len =3D *req_len; - ++s->iov_count; - } - - return id + 1; -} - static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode, bool acc_mode) { struct iovec iov[ASPEED_HACE_MAX_SG]; + uint32_t total_msg_len; + uint32_t pad_offset; g_autofree uint8_t *digest_buf =3D NULL; size_t digest_len =3D 0; - int niov =3D 0; + bool sg_acc_mode_final_request =3D false; int i; void *haddr; =20 @@ -226,8 +195,15 @@ static void do_hash_operation(AspeedHACEState *s, int = algo, bool sg_mode, } iov[i].iov_base =3D haddr; if (acc_mode) { - niov =3D gen_acc_mode_iov(s, iov, i, &plen); - + s->total_req_len +=3D plen; + + if (has_padding(s, &iov[i], plen, &total_msg_len, &pad_off= set)) { + /* Padding being present indicates the final request */ + sg_acc_mode_final_request =3D true; + iov[i].iov_len =3D pad_offset; + } else { + iov[i].iov_len =3D plen; + } } else { iov[i].iov_len =3D plen; } @@ -252,20 +228,42 @@ static void do_hash_operation(AspeedHACEState *s, int= algo, bool sg_mode, * required to check whether cache is empty. If no, we should * combine cached iov and the current iov. */ - uint32_t total_msg_len; - uint32_t pad_offset; s->total_req_len +=3D len; if (has_padding(s, iov, len, &total_msg_len, &pad_offset)) { - niov =3D reconstruct_iov(s, iov, 0, &pad_offset); + i =3D reconstruct_iov(s, iov, 0, &pad_offset); } } } =20 - if (niov) { - i =3D niov; - } + if (acc_mode) { + if (s->qcrypto_hash_context =3D=3D NULL && + qcrypto_hash_accumulate_new_ctx(algo, &s->qcrypto_hash_context= , NULL)) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: qcrypto failed to create hash context\n", + __func__); + return; + } + + if (qcrypto_hash_accumulate_bytesv(algo, + s->qcrypto_hash_context, iov, i, + &digest_buf, + &digest_len, NULL) < 0) { + + qemu_log_mask(LOG_GUEST_ERROR, "%s: qcrypto failed\n", __func_= _); + return; + } =20 - if (qcrypto_hash_bytesv(algo, iov, i, &digest_buf, &digest_len, NULL) = < 0) { + if (sg_acc_mode_final_request) { + if (qcrypto_hash_accumulate_free_ctx(s->qcrypto_hash_context, = NULL) < 0) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: qcrypto failed to free context\n", __fu= nc__); + } + + s->qcrypto_hash_context =3D NULL; + s->iov_count =3D 0; + s->total_req_len =3D 0; + } + } else if (qcrypto_hash_bytesv(algo, iov, i, &digest_buf, &digest_len,= NULL) < 0) { qemu_log_mask(LOG_GUEST_ERROR, "%s: qcrypto failed\n", __func__); return; } @@ -397,6 +395,11 @@ static void aspeed_hace_reset(DeviceState *dev) { struct AspeedHACEState *s =3D ASPEED_HACE(dev); =20 + if (s->qcrypto_hash_context !=3D NULL) { + qcrypto_hash_accumulate_free_ctx(s->qcrypto_hash_context, NULL); + s->qcrypto_hash_context =3D NULL; + } + memset(s->regs, 0, sizeof(s->regs)); s->iov_count =3D 0; s->total_req_len =3D 0; diff --git a/include/hw/misc/aspeed_hace.h b/include/hw/misc/aspeed_hace.h index ecb1b67de8..b3c2eb17b7 100644 --- a/include/hw/misc/aspeed_hace.h +++ b/include/hw/misc/aspeed_hace.h @@ -1,6 +1,7 @@ /* * ASPEED Hash and Crypto Engine * + * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates * Copyright (C) 2021 IBM Corp. * * SPDX-License-Identifier: GPL-2.0-or-later @@ -10,6 +11,7 @@ #define ASPEED_HACE_H =20 #include "hw/sysbus.h" +#include "crypto/hash.h" =20 #define TYPE_ASPEED_HACE "aspeed.hace" #define TYPE_ASPEED_AST2400_HACE TYPE_ASPEED_HACE "-ast2400" @@ -35,6 +37,8 @@ struct AspeedHACEState { =20 MemoryRegion *dram_mr; AddressSpace dram_as; + + qcrypto_hash_accumulate_ctx_t *qcrypto_hash_context; }; =20 =20 --=20 2.34.1