[syzbot] [crypto?] general protection fault in shash_async_export

From: syzbot
Date: Mon Jun 12 2023 - 06:02:35 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 37ff78e977f1 mlxsw: spectrum_nve_vxlan: Fix unsupported fl..
git tree: net-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15a22943280000
kernel config: https://syzkaller.appspot.com/x/.config?x=526f919910d4a671
dashboard link: https://syzkaller.appspot.com/bug?extid=472626bb5e7c59fb768f
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=133e0463280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1543e995280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/41e829152d3c/disk-37ff78e9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a594b97acb02/vmlinux-37ff78e9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b41140b53372/bzImage-37ff78e9.xz

The issue was bisected to:

commit c662b043cdca89bf0f03fc37251000ac69a3a548
Author: David Howells <dhowells@xxxxxxxxxx>
Date: Tue Jun 6 13:08:56 2023 +0000

crypto: af_alg/hash: Support MSG_SPLICE_PAGES

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15c78453280000
final oops: https://syzkaller.appspot.com/x/report.txt?x=17c78453280000
console output: https://syzkaller.appspot.com/x/log.txt?x=13c78453280000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+472626bb5e7c59fb768f@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: c662b043cdca ("crypto: af_alg/hash: Support MSG_SPLICE_PAGES")

general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 1 PID: 5002 Comm: syz-executor421 Not tainted 6.4.0-rc5-syzkaller-00859-g37ff78e977f1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
RIP: 0010:crypto_shash_alg include/crypto/hash.h:827 [inline]
RIP: 0010:crypto_shash_export include/crypto/hash.h:956 [inline]
RIP: 0010:shash_async_export+0x47/0xa0 crypto/shash.c:389
Code: 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 75 4e 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 50 48 8d 7b 20 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 40 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 20 48 8d
RSP: 0018:ffffc900038afd20 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff83df0723 RDI: 0000000000000020
RBP: 0000000000000010 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000064d R12: ffff8880766612f8
R13: 0000000000000001 R14: ffff888077e0aa00 R15: ffff88802927ea48
FS: 00005555557db300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f069bf4bfd8 CR3: 00000000773e6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
crypto_ahash_export include/crypto/hash.h:523 [inline]
hash_accept+0x229/0x670 crypto/algif_hash.c:286
hash_accept_nokey+0x67/0x90 crypto/algif_hash.c:416
do_accept+0x380/0x510 net/socket.c:1883
__sys_accept4_file net/socket.c:1924 [inline]
__sys_accept4+0x9a/0x120 net/socket.c:1954
__do_sys_accept net/socket.c:1971 [inline]
__se_sys_accept net/socket.c:1968 [inline]
__x64_sys_accept+0x75/0xb0 net/socket.c:1968
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f069bf04c39
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc03b39588 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f069bf04c39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f069bec8de0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f069bec8e70
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:crypto_shash_alg include/crypto/hash.h:827 [inline]
RIP: 0010:crypto_shash_export include/crypto/hash.h:956 [inline]
RIP: 0010:shash_async_export+0x47/0xa0 crypto/shash.c:389
Code: 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 75 4e 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 50 48 8d 7b 20 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 40 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 20 48 8d
RSP: 0018:ffffc900038afd20 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff83df0723 RDI: 0000000000000020
RBP: 0000000000000010 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000064d R12: ffff8880766612f8
R13: 0000000000000001 R14: ffff888077e0aa00 R15: ffff88802927ea48
FS: 00005555557db300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558cc7d83000 CR3: 00000000773e6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 3 bytes skipped:
0: df 4c 89 e2 fisttps -0x1e(%rcx,%rcx,4)
4: 48 c1 ea 03 shr $0x3,%rdx
8: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
c: 75 4e jne 0x5c
e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
15: fc ff df
18: 48 8b 5b 50 mov 0x50(%rbx),%rbx
1c: 48 8d 7b 20 lea 0x20(%rbx),%rdi
20: 48 89 fa mov %rdi,%rdx
23: 48 c1 ea 03 shr $0x3,%rdx
* 27: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2b: 75 40 jne 0x6d
2d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
34: fc ff df
37: 48 8b 5b 20 mov 0x20(%rbx),%rbx
3b: 48 rex.W
3c: 8d .byte 0x8d

---
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Next message: syzbot: "[syzbot] [net?] KASAN: stack-out-of-bounds Read in skb_splice_from_iter"
Previous message: Ravi Gunasekaran: "[PATCH] net: hsr: Disable promiscuous mode in offload mode"
Next in thread: David Howells: "Re: [syzbot] [crypto?] general protection fault in shash_async_export"
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