GPF in lrw_crypt

[Dmitry Vyukov]

Hello,

The following program causes GPF in lrw_crypt:

// autogenerated by syzkaller (http://github.com/google/syzkaller)
#include <syscall.h>
#include <string.h>
#include <stdint.h>

int main()
{
        long r0 = syscall(SYS_socket, 0x26ul, 0x5ul, 0x0ul, 0, 0, 0);
        long r1 = syscall(SYS_mmap, 0x20000000ul, 0x10000ul, 0x2ul,
0x32ul, 0xfffffffffffffffful, 0x0ul);
        *(uint16_t*)0x20001000 = 0x26;
        memcpy((void*)0x20001002,
"\x73\x6b\x63\x69\x70\x68\x65\x72\x00\x00\x00\x00\x00\x00", 14);
        *(uint32_t*)0x20001010 = 0xf;
        *(uint32_t*)0x20001014 = 0x100;
        memcpy((void*)0x20001018,
"\x6c\x72\x77\x28\x74\x77\x6f\x66\x69\x73\x68\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);
        long r7 = syscall(SYS_bind, r0, 0x20001000ul, 0x58ul, 0, 0, 0);
        long r8 = syscall(SYS_accept4, r0, 0x0ul, 0x200023fdul, 0x800ul, 0, 0);
        memcpy((void*)0x20002fd8,
"\x09\xf1\x98\x36\x3f\x7d\x29\x96\x55\xe6\xa2\x42\x45\x67\x8f\x7c\x27\x44\x51\x6f\xbe\x4d\x52\x6f\x40\xaf\xe0\xd6\x04\x8d\x86\x36\x08\xc8\x55\xb8\xfe\x6e\x89\xef\x15\x2d\x07\x9a\x74\xab\xc7\x47\x26\xb5\x00\x93\x3b\x59\xe2\x1f\x6a\x29\x76\x7f\x9d\x3a\x86\x38\xda\x3e\xfb\xbe\x63\x2e\x38\x2f\x5c\x1c\x4d\xb8\x53\xf9\x97\xdb\x4a\xcc\xad\x55\xb3\xb5\xa0\xb4\xad\xfb\x39\xe5\x44\x12\x0b\x5f\x03\xbf\xc7\x28\x36\x1a\x7b\x4a\xff\x3e\x71\x17\x44\xf3\x09\xfb\x44\x41\x55\x1b\x6e\x6c\xcd\x03\x39\x66\xe2\x87\x65\xdd\x66\x7c\x00\x9f\x46\x54\x66\xf1\xa8\x4b\xd9\x10\xdc\x45\xd0\x57\x5c\x5e\x97\x42\x3a\xc9\x26\x5a\x55\x57\x65\x5f\x38\x54\xdd\x1e\xd8\x89\xe0\x34\xf0\x9e\x65\xf8\x89\x8e\xe4\x02\xdc\xa2\xa8\x45\x9c\xe9\xca\xef\xad\xdc\x74\xb5",
182);
        long r10 = syscall(SYS_write, r8, 0x20002fd8ul, 0xb6ul, 0, 0, 0);
        *(uint64_t*)0x20000fb8 = 0x20004fff;
        *(uint64_t*)0x20000fc0 = 0x94;
        *(uint64_t*)0x20000fc8 = 0x20000000;
        *(uint64_t*)0x20000fd0 = 0x5d;
        *(uint64_t*)0x20000fd8 = 0x20000f1b;
        *(uint64_t*)0x20000fe0 = 0xe5;
        *(uint64_t*)0x20000fe8 = 0x20004b08;
        *(uint64_t*)0x20000ff0 = 0xe9;
        *(uint64_t*)0x20000ff8 = 0x20002000;
        *(uint64_t*)0x20001000 = 0x1000;
        long r21 = syscall(SYS_readv, r8, 0x20000fb8ul, 0x5ul, 0, 0, 0);
        return 0;
}


================================================================================
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory
accessgeneral protection fault: 0000 [#1] SMP KASAN
Modules linked in:
CPU: 2 PID: 6912 Comm: a.out Not tainted 4.4.0-rc3+ #151
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88005ee61680 ti: ffff88005fef0000 task.ti: ffff88005fef0000
RIP: 0010:[<ffffffff82bf9609>]  [<ffffffff82bf9609>] gf128mul_64k_bbe+0x89/0x3f0
RSP: 0018:ffff88005fef7590  EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffffed000bfdee9f RSI: ffff88005ee61e40 RDI: ffffed000bfdeeab
RBP: ffff88005fef7650 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88005fef7870
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff1000bfdeeb8
FS:  00000000026a3880(0063) GS:ffff88006ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000020000fb8 CR3: 000000005ffa0000 CR4: 00000000000006e0
Stack:
 ffff88005fef7730 ffff880000000fff 1ffff1000bfdeeb8 ffff88005fef7870
 ffff88005fef7710 0000000000000000 0000000041b58ab3 ffffffff87ab3a79
 ffffffff82bf9580 ffffffff82bafa9b ffff88005ee61680 0000000000000001
Call Trace:
 [<ffffffff82c04b9d>] lrw_crypt+0x29d/0xd20 crypto/lrw.c:248
 [<ffffffff812c6332>] lrw_decrypt+0xf2/0x150
arch/x86/crypto/serpent_avx2_glue.c:270
 [<ffffffff82babe81>] async_decrypt+0x1c1/0x2c0 crypto/blkcipher.c:443
 [<     inline     >] crypto_ablkcipher_decrypt include/linux/crypto.h:921
 [<     inline     >] skcipher_recvmsg_sync crypto/algif_skcipher.c:676
 [<ffffffff82d2e7b9>] skcipher_recvmsg+0x1029/0x1f10 crypto/algif_skcipher.c:706
 [<     inline     >] sock_recvmsg_nosec net/socket.c:712
 [<ffffffff856b1c8a>] sock_recvmsg+0xaa/0xe0 net/socket.c:720
 [<ffffffff856b1f33>] sock_read_iter+0x273/0x3d0 net/socket.c:797
 [<ffffffff8189655e>] do_iter_readv_writev+0x14e/0x2c0 fs/read_write.c:664
 [<ffffffff81898d62>] do_readv_writev+0x2e2/0x880 fs/read_write.c:808
 [<ffffffff81899395>] vfs_readv+0x95/0xd0 fs/read_write.c:834
 [<     inline     >] SYSC_readv fs/read_write.c:860
 [<ffffffff8189c181>] SyS_readv+0x111/0x2f0 fs/read_write.c:852
 [<ffffffff86a89fb6>] entry_SYSCALL_64_fastpath+0x16/0x7a
arch/x86/entry/entry_64.S:185
Code: 04 00 00 f4 f4 c7 40 08 f3 f3 f3 f3 e8 d1 e9 a0 fe 4d 85 f6 0f
84 f6 01 00 00 4c 89 f1 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 <80>
3c 01 00 0f 85 48 03 00 00 48 8b 5c 24 18 4d 8b 26 48 83 c3
RIP  [<ffffffff82bf9609>] gf128mul_64k_bbe+0x89/0x3f0 crypto/gf128mul.c:379
 RSP <ffff88005fef7590>
---[ end trace 018c54843b88ec1d ]---


On upstream commit 31ade3b83e1821da5fbb2f11b5b3d4ab2ec39db8 (Nov 29).
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