On Tue, Nov 28, 2017 at 05:23:01AM -0800, syzbot wrote: > ================================================================== > BUG: KASAN: stack-out-of-bounds in memcpy include/linux/string.h:341 > [inline] > BUG: KASAN: stack-out-of-bounds in sha3_update+0xdf/0x2e0 > crypto/sha3_generic.c:161 > Write of size 4096 at addr ffff8801cca07c40 by task syzkaller076574/3044 > > CPU: 1 PID: 3044 Comm: syzkaller076574 Not tainted 4.14.0-mm1+ #25 > Hardware name: Google Google Compute Engine/Google Compute Engine, > BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x194/0x257 lib/dump_stack.c:53 > print_address_description+0x73/0x250 mm/kasan/report.c:252 > kasan_report_error mm/kasan/report.c:351 [inline] > kasan_report+0x25b/0x340 mm/kasan/report.c:409 > check_memory_region_inline mm/kasan/kasan.c:260 [inline] > check_memory_region+0x137/0x190 mm/kasan/kasan.c:267 > memcpy+0x37/0x50 mm/kasan/kasan.c:303 > memcpy include/linux/string.h:341 [inline] > sha3_update+0xdf/0x2e0 crypto/sha3_generic.c:161 > crypto_shash_update+0xcb/0x220 crypto/shash.c:109 > shash_finup_unaligned+0x2a/0x60 crypto/shash.c:151 > crypto_shash_finup+0xc4/0x120 crypto/shash.c:165 > hmac_finup+0x182/0x330 crypto/hmac.c:152 > crypto_shash_finup+0xc4/0x120 crypto/shash.c:165 > shash_digest_unaligned+0x9e/0xd0 crypto/shash.c:172 > crypto_shash_digest+0xc4/0x120 crypto/shash.c:186 > hmac_setkey+0x36a/0x690 crypto/hmac.c:66 > crypto_shash_setkey+0xad/0x190 crypto/shash.c:64 > shash_async_setkey+0x47/0x60 crypto/shash.c:207 > crypto_ahash_setkey+0xaf/0x180 crypto/ahash.c:200 > hash_setkey+0x40/0x90 crypto/algif_hash.c:446 > alg_setkey crypto/af_alg.c:221 [inline] > alg_setsockopt+0x2a1/0x350 crypto/af_alg.c:254 > SYSC_setsockopt net/socket.c:1851 [inline] > SyS_setsockopt+0x189/0x360 net/socket.c:1830 > entry_SYSCALL_64_fastpath+0x1f/0x96 #syz fix: crypto: hmac - require that the underlying hash algorithm is unkeyed
