From 9aedd10fe38418319bd8ed55dc68a40ec04aaa05 Mon Sep 17 00:00:00 2001 From: Dmitry Safonov Date: Tue, 7 Nov 2023 02:37:17 +0000 Subject: crypto: ahash - Set using_shash for cloned ahash wrapper over shash The cloned child of ahash that uses shash under the hood should use shash helpers (like crypto_shash_setkey()). The following panic may be observed on TCP-AO selftests: > ================================================================== > BUG: KASAN: wild-memory-access in crypto_mod_get+0x1b/0x60 > Write of size 4 at addr 5d5be0ff5c415e14 by task connect_ipv4/1397 > > CPU: 0 PID: 1397 Comm: connect_ipv4 Tainted: G W 6.6.0+ #47 > Call Trace: > > dump_stack_lvl+0x46/0x70 > kasan_report+0xc3/0xf0 > kasan_check_range+0xec/0x190 > crypto_mod_get+0x1b/0x60 > crypto_spawn_alg+0x53/0x140 > crypto_spawn_tfm2+0x13/0x60 > hmac_init_tfm+0x25/0x60 > crypto_ahash_setkey+0x8b/0x100 > tcp_ao_add_cmd+0xe7a/0x1120 > do_tcp_setsockopt+0x5ed/0x12a0 > do_sock_setsockopt+0x82/0x100 > __sys_setsockopt+0xe9/0x160 > __x64_sys_setsockopt+0x60/0x70 > do_syscall_64+0x3c/0xe0 > entry_SYSCALL_64_after_hwframe+0x46/0x4e > ================================================================== > general protection fault, probably for non-canonical address 0x5d5be0ff5c415e14: 0000 [#1] PREEMPT SMP KASAN > CPU: 0 PID: 1397 Comm: connect_ipv4 Tainted: G B W 6.6.0+ #47 > Call Trace: > > ? die_addr+0x3c/0xa0 > ? exc_general_protection+0x144/0x210 > ? asm_exc_general_protection+0x22/0x30 > ? add_taint+0x26/0x90 > ? crypto_mod_get+0x20/0x60 > ? crypto_mod_get+0x1b/0x60 > ? ahash_def_finup_done1+0x58/0x80 > crypto_spawn_alg+0x53/0x140 > crypto_spawn_tfm2+0x13/0x60 > hmac_init_tfm+0x25/0x60 > crypto_ahash_setkey+0x8b/0x100 > tcp_ao_add_cmd+0xe7a/0x1120 > do_tcp_setsockopt+0x5ed/0x12a0 > do_sock_setsockopt+0x82/0x100 > __sys_setsockopt+0xe9/0x160 > __x64_sys_setsockopt+0x60/0x70 > do_syscall_64+0x3c/0xe0 > entry_SYSCALL_64_after_hwframe+0x46/0x4e > > RIP: 0010:crypto_mod_get+0x20/0x60 Make sure that the child/clone has using_shash set when parent is an shash user. Fixes: 2f1f34c1bf7b ("crypto: ahash - optimize performance when wrapping shash") Cc: David Ahern Cc: "David S. Miller" Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Eric Biggers Cc: Eric Dumazet Cc: Francesco Ruggeri To: Herbert Xu Cc: Jakub Kicinski Cc: Paolo Abeni Cc: Salam Noureddine Cc: netdev@vger.kernel.org Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Dmitry Safonov Reviewed-by: Eric Biggers Signed-off-by: Herbert Xu --- crypto/ahash.c | 1 + 1 file changed, 1 insertion(+) diff --git a/crypto/ahash.c b/crypto/ahash.c index deee55f939dc..80c3e5354711 100644 --- a/crypto/ahash.c +++ b/crypto/ahash.c @@ -651,6 +651,7 @@ struct crypto_ahash *crypto_clone_ahash(struct crypto_ahash *hash) err = PTR_ERR(shash); goto out_free_nhash; } + nhash->using_shash = true; *nctx = shash; return nhash; } -- cgit