linux-kernel - GPF in gf128mul_64k

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Message-ID: <CACT4Y+aQg8LqJ-S37FnZDL5bLpxozji-0hRK1BjHVjafPpCriw@mail.gmail.com>
Date:	Thu, 17 Dec 2015 14:00:23 +0100
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Cc:	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Kees Cook <keescook@...gle.com>
Subject: GPF in gf128mul_64k_bbe

Hello,

The following program causes GPF in gf128mul_64k_bbe:

// 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, 0x3ul,
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\x63\x61\x6d\x65\x6c\x6c\x69\x61\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",
64);
        long r7 = syscall(SYS_bind, r0, 0x20001000ul, 0x58ul, 0, 0, 0);
        long r8 = syscall(SYS_accept4, r0, 0x0ul, 0x200023fdul, 0x800ul, 0, 0);
        *(uint32_t*)0x20002000 = 0x12;
        *(uint32_t*)0x20002004 = 0x8;
        *(uint64_t*)0x20002008 = 0x0;
        *(uint16_t*)0x20002010 = 0x4d;
        long r13 = syscall(SYS_write, r8, 0x20002000ul, 0x12ul, 0, 0, 0);
        memcpy((void*)0x20000a56,
"\x05\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\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\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
128);
        long r15 = syscall(SYS_recvfrom, r8, 0x20000000ul, 0xb6ul,
0x0ul, 0x20000a56ul, 0x80ul);
        return 0;
}


general protection fault: 0000 [#2] SMP KASAN
Modules linked in:
CPU: 0 PID: 6955 Comm: executor Not tainted 4.4.0-rc3+ #151
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88005fc88000 ti: ffff880062478000 task.ti: ffff880062478000
RIP: 0010:[<ffffffff82bf9609>]
  [<ffffffff82bf9609>] gf128mul_64k_bbe+0x89/0x3f0 crypto/gf128mul.c:379
RSP: 0018:ffff88006247f720  EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffffed000c48fed1 RSI: 0000000000000000 RDI: ffffed000c48fedd
RBP: ffff88006247f7e0 R08: ffff88003dfd1158 R09: 0000000000001000
R10: 0000000000000010 R11: 1ffff100075eeb92 R12: ffff88006247fa00
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff1000c48feea
FS:  00007f21e795f700(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000020000a56 CR3: 0000000060c4b000 CR4: 00000000000006f0
Stack:
 ffff88006247f8c0 ffff88006247f8b8 1ffff1000c48feea ffff88006247fa00
 ffff88006247f8a0 0000000000000000 0000000041b58ab3 ffffffff87ab3a79
 ffffffff82bf9580 ffffffff82bafa9b 0000000000000000 ffff88006247f7a0
Call Trace:
 [<ffffffff82c04b9d>] lrw_crypt+0x29d/0xd20 crypto/lrw.c:248
 [<ffffffff812b838b>] lrw_decrypt+0xeb/0x140
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
 [<ffffffff856b2424>] SYSC_recvfrom+0x1e4/0x370 net/socket.c:1707
 [<ffffffff856b7570>] SyS_recvfrom+0x40/0x50 net/socket.c:1681
 [<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 <ffff88006247f720>
---[ end trace 722d56533c7c99a7 ]---


On upstream commit 31ade3b83e1821da5fbb2f11b5b3d4ab2ec39db8 (Nov 29).
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