linux-kernel - [syzbot] [crypto?] KASAN: wild-memory-access Read in crypto_nhpoly1305_update

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Message-ID: <68c0f496.050a0220.3c6139.0017.GAE@google.com>
Date: Tue, 09 Sep 2025 20:46:30 -0700
From: syzbot <syzbot+634e67b3f57206befe3c@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, davem@...emloft.net, david@...hat.com, 
	herbert@...dor.apana.org.au, jgg@...pe.ca, jhubbard@...dia.com, 
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, peterx@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [crypto?] KASAN: wild-memory-access Read in crypto_nhpoly1305_update_helper

Hello,

syzbot found the following issue on:

HEAD commit:    be5d4872e528 Add linux-next specific files for 20250905
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10f70962580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a726684450a7d788
dashboard link: https://syzkaller.appspot.com/bug?extid=634e67b3f57206befe3c
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1247a962580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12751134580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f67121360b62/disk-be5d4872.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4f666ca2e57f/vmlinux-be5d4872.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e86b794b985e/bzImage-be5d4872.xz

The issue was bisected to:

commit db076b5db550aa34169dceee81d0974c7b2a2482
Author: David Hildenbrand <david@...hat.com>
Date:   Mon Sep 1 15:03:40 2025 +0000

    mm/gup: remove record_subpages()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=173c0642580000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=14bc0642580000
console output: https://syzkaller.appspot.com/x/log.txt?x=10bc0642580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+634e67b3f57206befe3c@...kaller.appspotmail.com
Fixes: db076b5db550 ("mm/gup: remove record_subpages()")

==================================================================
BUG: KASAN: wild-memory-access in crypto_nhpoly1305_update_helper+0x156/0x390 crypto/nhpoly1305.c:165
Read of size 15 at addr 0005088000000000 by task syz.0.17/6036

CPU: 0 UID: 0 PID: 6036 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 crypto_nhpoly1305_update_helper+0x156/0x390 crypto/nhpoly1305.c:165
 nhpoly1305_sse2_update+0x68/0xb0 arch/x86/crypto/nhpoly1305-sse2-glue.c:29
 crypto_shash_update include/crypto/hash.h:1006 [inline]
 shash_ahash_update+0x213/0x2f0 crypto/ahash.c:178
 hash_sendmsg+0x96b/0x11d0 crypto/algif_hash.c:149
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x219/0x270 net/socket.c:729
 ____sys_sendmsg+0x52d/0x830 net/socket.c:2614
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
 __sys_sendmmsg+0x227/0x430 net/socket.c:2757
 __do_sys_sendmmsg net/socket.c:2784 [inline]
 __se_sys_sendmmsg net/socket.c:2781 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2781
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdaa258ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc3b406218 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fdaa27c5fa0 RCX: 00007fdaa258ebe9
RDX: 0000000000000001 RSI: 0000200000004140 RDI: 0000000000000006
RBP: 00007fdaa2611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdaa27c5fa0 R14: 00007fdaa27c5fa0 R15: 0000000000000004
 </TASK>
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
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