Hello, The following program cause BUG in scatterwalk: // autogenerated by syzkaller (http://github.com/google/syzkaller) #include <unistd.h> #include <sys/syscall.h> #include <string.h> #include <stdint.h> #include <pthread.h> long r[30]; void *thr(void *arg) { switch ((long)arg) { case 0: r[0] = syscall(SYS_mmap, 0x20000000ul, 0x32000ul, 0x3ul, 0x32ul, 0xfffffffffffffffful, 0x0ul); break; case 1: r[1] = syscall(SYS_socket, 0x26ul, 0x5ul, 0x0ul, 0, 0, 0); break; case 2: *(uint16_t*)0x2000c8ab = (uint16_t)0x26; memcpy((void*)0x2000c8ad, "\x73\x6b\x63\x69\x70\x68\x65\x72\x00\x00\x00\x00\x00\x00", 14); *(uint32_t*)0x2000c8bb = (uint32_t)0x8; *(uint32_t*)0x2000c8bf = (uint32_t)0xb; memcpy((void*)0x2000c8c3, "\x6c\x72\x77\x28\x73\x65\x72\x70\x65\x6e\x74\x29\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 64); r[7] = syscall(SYS_bind, r[1], 0x2000c8abul, 0x58ul, 0, 0, 0); break; case 3: memcpy((void*)0x2002cb94, "\xdc\x4f\x77\x67\x54\xf2\x23\xd1\xbe\x5c\x6b\x02\xa6\x65\xc1\x0f\x74\xbd\xca\x88\x2e\x8c", 22); r[9] = syscall(SYS_setsockopt, r[1], 0x117ul, 0x1ul, 0x2002cb94ul, 0x16ul, 0); break; case 4: r[10] = syscall(SYS_accept4, r[1], 0x0ul, 0x2001f000ul, 0x80000ul, 0, 0); break; case 5: memcpy((void*)0x2002f622, "\x3d\xfd\xfe\x62\xbf\xa7\xa7\xdf\x4c\x40\x8f\x45\x46\x69\x27\x93\xa7\x35\x0b\xc6\xc9\x2b\xa2\x31\xf2\x9e\xb7\xb4\xaa\x9f\x96\xc1\x27\xf0\x9d\x3e\x81\xeb\xdc\x31\x02\x6c\x6c\xbc\xf5\xab\x5a\x25\x26\x76\x31\x4b\x4c\x50\xc4\xf6\x99\x1e\x69\xfc\x47\x49\xee\x12\xc4\xf3\x6c\x97\x58\xa6\xa6\xf8\x1c\x3d\x43\xcc\x6f\x6e\x9d\x89\x85\xb2\x53\x27\x43\xf7\x62\xcc\xa9\x6b\xda\x8f\xeb\x21\xa6\x49\xae\xb5\xf5\x43\x23\xbd\xe2\x29\x5c\x5d\x08\xa4\xd2\xb6\x7d\x72\x4f\x99\x38\x01\xd7\x31\x7b\xa3\xf1\xbb\x85\xf4\x9a\xb1\xa2\x9d\x03\xcb\x74\x7b\x5d\xf9\x83\x02\xd9\xc6\x74\x02\xd7\x01\xf9\xcb\x96\x05\x71\x94\x39\xd4\xc2\x27\xdd\x0f\x13\x72\x90\xdf\x84\xa9\x8f\x70\xb5\x7a", 164); memcpy((void*)0x2002f000, "\x05\x00", 2); r[13] = syscall(SYS_sendto, r[10], 0x2002f622ul, 0xa4ul, 0x8000ul, 0x2002f000ul, 0x2ul); break; case 6: *(uint64_t*)0x20030e26 = (uint64_t)0x20002fb5; *(uint32_t*)0x20030e2e = (uint32_t)0x80; *(uint64_t*)0x20030e36 = (uint64_t)0x20030000; *(uint64_t*)0x20030e3e = (uint64_t)0x4; *(uint64_t*)0x20030e46 = (uint64_t)0x20030bd7; *(uint64_t*)0x20030e4e = (uint64_t)0xcd; *(uint32_t*)0x20030e56 = (uint32_t)0x4f3e; *(uint64_t*)0x20030000 = (uint64_t)0x20030f76; *(uint64_t*)0x20030008 = (uint64_t)0xfa; *(uint64_t*)0x20030010 = (uint64_t)0x20030240; *(uint64_t*)0x20030018 = (uint64_t)0x72; *(uint64_t*)0x20030020 = (uint64_t)0x20030fb2; *(uint64_t*)0x20030028 = (uint64_t)0x83; *(uint64_t*)0x20030030 = (uint64_t)0x200304cf; *(uint64_t*)0x20030038 = (uint64_t)0xde; r[29] = syscall(SYS_recvmmsg, r[10], 0x20030e26ul, 0x1ul, 0x20ul, 0, 0); break; } return 0; } int main() { long i; pthread_t th[7]; memset(r, -1, sizeof(r)); for (i = 0; i < 7; i++) { pthread_create(&th[i], 0, thr, (void*)i); usleep(10000); } for (i = 0; i < 7; i++) { pthread_create(&th[i], 0, thr, (void*)i); if (i%2==0) usleep(10000); } usleep(100000); return 0; } ------------[ cut here ]------------ kernel BUG at crypto/scatterwalk.c:37! invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN Modules linked in: CPU: 1 PID: 6684 Comm: syz-executor Not tainted 4.4.0+ #221 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff880060d7de00 ti: ffff880065348000 task.ti: ffff880065348000 RIP: 0010:[<ffffffff82733529>] [<ffffffff82733529>] scatterwalk_start.part.3+0x9/0x10 RSP: 0018:ffff88006534f400 EFLAGS: 00010297 RAX: ffff880060d7de00 RBX: ffff880037623150 RCX: ffff8800364b7310 RDX: 0000000000000000 RSI: ffff880037623150 RDI: ffff880037623164 RBP: ffff88006534f400 R08: ffff88006534f6b0 R09: ffff880037623148 R10: ffffed0006ec4638 R11: 1ffff10006ec4629 R12: ffff88006534f580 R13: 0000000000000000 R14: ffff88006534f5d8 R15: ffff88006534f560 FS: 00007fb85fc02700(0000) GS:ffff88003ed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000451a70 CR3: 000000006257f000 CR4: 00000000000006e0 Stack: ffff88006534f420 ffffffff827335f6 ffff88006534f820 ffff88006534f598 ffff88006534f478 ffffffff8273d640 ffffed000c4afb00 ffff880035581f60 0000000020031000 ffff8800364b7310 ffff88006534f560 ffff88006534f820 Call Trace: [<ffffffff827335f6>] scatterwalk_start+0xc6/0xf0 crypto/scatterwalk.c:40 [<ffffffff8273d640>] blkcipher_walk_first+0x170/0x4d0 crypto/blkcipher.c:341 [<ffffffff8273dbb9>] blkcipher_walk_virt+0x219/0x2a0 crypto/blkcipher.c:307 [<ffffffff8278256b>] lrw_crypt+0x14b/0x990 crypto/lrw.c:234 [<ffffffff812a9ea8>] lrw_decrypt+0x128/0x1a0 arch/x86/crypto/serpent_avx2_glue.c:281 [<ffffffff828590c7>] ablk_decrypt+0x187/0x420 crypto/ablk_helper.c:108 [< inline >] skcipher_crypt_ablkcipher crypto/skcipher.c:157 [<ffffffff8273f2c2>] skcipher_decrypt_ablkcipher+0x312/0x420 crypto/skcipher.c:175 [< inline >] crypto_skcipher_decrypt include/crypto/skcipher.h:356 [< inline >] skcipher_recvmsg_sync crypto/algif_skcipher.c:680 [<ffffffff82849123>] skcipher_recvmsg+0x11d3/0x1c80 crypto/algif_skcipher.c:710 [< inline >] sock_recvmsg_nosec net/socket.c:713 [<ffffffff84d3aafd>] sock_recvmsg+0x9d/0xb0 net/socket.c:721 [<ffffffff84d3de29>] ___sys_recvmsg+0x259/0x540 net/socket.c:2099 [<ffffffff84d402d9>] __sys_recvmmsg+0x219/0x7b0 net/socket.c:2205 [< inline >] SYSC_recvmmsg net/socket.c:2279 [<ffffffff84d409df>] SyS_recvmmsg+0x16f/0x180 net/socket.c:2268 [<ffffffff85e74936>] entry_SYSCALL_64_fastpath+0x16/0x7a arch/x86/entry/entry_64.S:185 Code: 41 5d 41 5e 41 5f 5d c3 e8 65 0f 00 ff e9 66 ff ff ff e8 5b 0f 00 ff eb ae 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 e8 07 c8 e2 fe <0f> 0b 0f 1f 44 00 00 55 48 89 e5 41 54 53 49 89 fc 48 89 f3 e8 RIP [<ffffffff82733529>] scatterwalk_start.part.3+0x9/0x10 crypto/scatterwalk.c:37 RSP <ffff88006534f400> ------------[ cut here ]------------ ------------[ cut here ]------------ kernel BUG at include/linux/scatterlist.h:123! invalid opcode: 0000 [#49] SMP DEBUG_PAGEALLOC KASAN Modules linked in: CPU: 0 PID: 7643 Comm: syz-executor Tainted: G D 4.4.0+ #221 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88003e282f00 ti: ffff8800372a8000 task.ti: ffff8800372a8000 RIP: 0010:[<ffffffff8273ce05>] [<ffffffff8273ce05>] blkcipher_walk_next+0xb55/0x1220 RSP: 0018:ffff8800372af3a8 EFLAGS: 00010297 RAX: ffff88003e282f00 RBX: ffff8800372af560 RCX: 0000000087654321 RDX: 0000000000000000 RSI: 1ffff10006e33639 RDI: ffff88003719b15c RBP: ffff8800372af420 R08: ffff8800372af6b0 R09: 000000000000008a R10: 0000000000000010 R11: 1ffff10006e33629 R12: 0000000000000000 R13: 00000000000000a0 R14: ffff8800372af590 R15: 0000000000000000 FS: 00007fb85fc02700(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000020030e26 CR3: 0000000035615000 CR4: 00000000000006f0 Stack: ffffffff8176d8cf 0000000000000000 ffff880035fcdcf8 ffff8800372af598 ffff8800372af5cc ffff8800372af580 ffff88003719b1c8 ffff88003719b148 8000000088fb30b0 ffff880000000f76 ffff8800372af820 ffff8800372af598 Call Trace: [<ffffffff8273d699>] blkcipher_walk_first+0x1c9/0x4d0 crypto/blkcipher.c:345 [<ffffffff8273dbb9>] blkcipher_walk_virt+0x219/0x2a0 crypto/blkcipher.c:307 [<ffffffff8278256b>] lrw_crypt+0x14b/0x990 crypto/lrw.c:234 [<ffffffff812a9ea8>] lrw_decrypt+0x128/0x1a0 arch/x86/crypto/serpent_avx2_glue.c:281 [<ffffffff828590c7>] ablk_decrypt+0x187/0x420 crypto/ablk_helper.c:108 [< inline >] skcipher_crypt_ablkcipher crypto/skcipher.c:157 [<ffffffff8273f2c2>] skcipher_decrypt_ablkcipher+0x312/0x420 crypto/skcipher.c:175 [< inline >] crypto_skcipher_decrypt include/crypto/skcipher.h:356 [< inline >] skcipher_recvmsg_sync crypto/algif_skcipher.c:680 [<ffffffff82849123>] skcipher_recvmsg+0x11d3/0x1c80 crypto/algif_skcipher.c:710 [< inline >] sock_recvmsg_nosec net/socket.c:713 [<ffffffff84d3aafd>] sock_recvmsg+0x9d/0xb0 net/socket.c:721 [<ffffffff84d3de29>] ___sys_recvmsg+0x259/0x540 net/socket.c:2099 [<ffffffff84d402d9>] __sys_recvmmsg+0x219/0x7b0 net/socket.c:2205 [< inline >] SYSC_recvmmsg net/socket.c:2279 [<ffffffff84d409df>] SyS_recvmmsg+0x16f/0x180 net/socket.c:2268 [<ffffffff85e74936>] entry_SYSCALL_64_fastpath+0x16/0x7a arch/x86/entry/entry_64.S:185 Code: e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8 84 76 ff fe 44 8b 6b 6c 45 31 e4 41 83 cd 02 44 89 6b 6c e9 0a fa ff ff e8 2b 2f e2 fe <0f> 0b e8 24 2f e2 fe 0f 0b 48 89 f7 e8 5a 76 ff fe e9 4d f5 ff RIP [< inline >] blkcipher_next_fast include/linux/scatterlist.h:123 RIP [<ffffffff8273ce05>] blkcipher_walk_next+0xb55/0x1220 crypto/blkcipher.c:264 RSP <ffff8800372af3a8> ------------[ cut here ]------------ On commit afd2ff9b7e1b367172f18ba7f693dfb62bdcb2dc (Jan 10) + several pending crypto fixes from Herbert: https://gist.githubusercontent.com/dvyukov/fad55a75c516033c50a9/raw/e7297c104e0146807591dc0bc6c768b688f3b9af/gistfile1.txt -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
