crypto: ablk_decrypt causes BUG in scatterwalk

From: Dmitry Vyukov
Date: Tue Jan 12 2016 - 04:32:42 EST

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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

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Next in thread: Dmitry Vyukov: "Re: crypto: ablk_decrypt causes BUG in scatterwalk"
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