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Message-ID: <00000000000066a78105c96df6a3@google.com>
Date: Fri, 13 Aug 2021 03:03:26 -0700
From: syzbot <syzbot+66e3ea42c4b176748b9c@...kaller.appspotmail.com>
To: davem@...emloft.net, herbert@...dor.apana.org.au,
linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] general protection fault in scatterwalk_copychunks (4)
syzbot has found a reproducer for the following issue on:
HEAD commit: f8fbb47c6e86 Merge branch 'for-v5.14' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11d1a779300000
kernel config: https://syzkaller.appspot.com/x/.config?x=171d57d5a48c8cad
dashboard link: https://syzkaller.appspot.com/bug?extid=66e3ea42c4b176748b9c
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13b8db9e300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16c21581300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+66e3ea42c4b176748b9c@...kaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 58 Comm: kworker/u4:3 Not tainted 5.14.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt_parallel padata_parallel_worker
RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:68 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:88 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:77 [inline]
RIP: 0010:scatterwalk_copychunks+0x4db/0x6a0 crypto/scatterwalk.c:50
Code: ff df 80 3c 02 00 0f 85 b4 01 00 00 49 8d 44 24 08 4d 89 26 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 77 01 00 00 48 b8 00 00 00 00
RSP: 0018:ffffc900011d7628 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83d3dc23 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88801903a69b
R10: ffffffff83d3dbd3 R11: 0000000000086088 R12: 0000000000000000
R13: 0000000000000001 R14: ffffc900011d7888 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000100 CR3: 000000001d355000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
skcipher_next_slow crypto/skcipher.c:278 [inline]
skcipher_walk_next+0x7af/0x1680 crypto/skcipher.c:363
skcipher_walk_first+0xf8/0x3c0 crypto/skcipher.c:446
skcipher_walk_aead_common+0x7a5/0xbc0 crypto/skcipher.c:539
gcmaes_crypt_by_sg+0x31d/0x890 arch/x86/crypto/aesni-intel_glue.c:658
gcmaes_encrypt+0xe2/0x230 arch/x86/crypto/aesni-intel_glue.c:722
generic_gcmaes_encrypt+0x12e/0x190 arch/x86/crypto/aesni-intel_glue.c:1071
crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94
crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94
pcrypt_aead_enc+0x13/0x70 crypto/pcrypt.c:82
padata_parallel_worker+0x60/0xb0 kernel/padata.c:157
process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
process_scheduled_works kernel/workqueue.c:2338 [inline]
worker_thread+0x85c/0x11f0 kernel/workqueue.c:2424
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Modules linked in:
---[ end trace d7f7427ae496b704 ]---
RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:68 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:88 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:77 [inline]
RIP: 0010:scatterwalk_copychunks+0x4db/0x6a0 crypto/scatterwalk.c:50
Code: ff df 80 3c 02 00 0f 85 b4 01 00 00 49 8d 44 24 08 4d 89 26 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 77 01 00 00 48 b8 00 00 00 00
RSP: 0018:ffffc900011d7628 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83d3dc23 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88801903a69b
R10: ffffffff83d3dbd3 R11: 0000000000086088 R12: 0000000000000000
R13: 0000000000000001 R14: ffffc900011d7888 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000100 CR3: 000000000b68e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: df 80 3c 02 00 0f filds 0xf00023c(%rax)
6: 85 b4 01 00 00 49 8d test %esi,-0x72b70000(%rcx,%rax,1)
d: 44 24 08 rex.R and $0x8,%al
10: 4d 89 26 mov %r12,(%r14)
13: 48 89 c2 mov %rax,%rdx
16: 48 89 44 24 18 mov %rax,0x18(%rsp)
1b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
22: fc ff df
25: 48 c1 ea 03 shr $0x3,%rdx
29: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2d: 84 c0 test %al,%al
2f: 74 08 je 0x39
31: 3c 03 cmp $0x3,%al
33: 0f 8e 77 01 00 00 jle 0x1b0
39: 48 rex.W
3a: b8 00 00 00 00 mov $0x0,%eax
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