linux-kernel - Re: [syzbot] [crypto?] KASAN: wild-memory-access Read in __sha512

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Message-ID: <20250908184653.GA189309@google.com>
Date: Mon, 8 Sep 2025 18:46:53 +0000
From: Eric Biggers <ebiggers@...nel.org>
To: syzbot <syzbot+e37eedd918576774ec80@...kaller.appspotmail.com>
Cc: davem@...emloft.net, herbert@...dor.apana.org.au,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [crypto?] KASAN: wild-memory-access Read in
 __sha512_update

On Mon, Sep 08, 2025 at 03:31:27AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    4ac65880ebca Add linux-next specific files for 20250904
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=11136312580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1220fefb3f11f346
> dashboard link: https://syzkaller.appspot.com/bug?extid=e37eedd918576774ec80
> 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=15136312580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16e23e62580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/17aafe2d8f53/disk-4ac65880.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/09caead80fb0/vmlinux-4ac65880.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/b33c041f8dc2/bzImage-4ac65880.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+e37eedd918576774ec80@...kaller.appspotmail.com
> 
> ==================================================================
> BUG: KASAN: wild-memory-access in __sha512_update+0x10d/0x1d0 lib/crypto/sha512.c:175
> Read of size 2 at addr 0005088000000000 by task syz.0.17/6022

Bug in mm/gup.c that reached linux-next but has already been fixed.

#syz dup: KASAN: null-ptr-deref Read in io_sqe_buffer_register

- Eric