linux-kernel - Re: [Linux Kernel Bug][mm/gup] 3 Warning Crashes: kmalloc bug in gup_test_ioctl, is_valid_gup_args, pin_user_pages

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Date: Fri, 26 Jan 2024 17:11:14 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Chenyuan Yang <chenyuan0y@...il.com>
Cc: akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, syzkaller@...glegroups.com,
	Zijie Zhao <zzjas98@...il.com>, John Hubbard <jhubbard@...dia.com>
Subject: Re: [Linux Kernel Bug][mm/gup] 3 Warning Crashes: kmalloc bug in
 gup_test_ioctl, is_valid_gup_args, pin_user_pages_fast

On Fri, Jan 26, 2024 at 11:04:53AM -0600, Chenyuan Yang wrote:
> Dear Developers for Linux Memory Management,
> 
> We encountered 3 warning crashes when testing the memory management
> with Syzkaller and our generated specifications:

These all come in through gup_test_ioctl().  It's my impression
that this is something you can enable to wreak havoc on your kernel
and it's not something which should ever be exposed to fuzzers.