linux-kernel - Re: "WARNING in nf_ct_alloc_hashtable" in Linux kernel version 6.13.0-rc2

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Message-ID: <Z3r1L69XacwS0_Ce@calendula>
Date: Sun, 5 Jan 2025 22:10:07 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: cheung wall <zzqq0103.hey@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: "WARNING in nf_ct_alloc_hashtable" in Linux kernel version
 6.13.0-rc2

Hi,

On Fri, Jan 03, 2025 at 06:01:50PM -0800, Andrew Morton wrote:
> On Fri, 3 Jan 2025 17:12:53 +0800 cheung wall <zzqq0103.hey@...il.com> wrote:
> 
> > Hello,
> > 
> > I am writing to report a potential vulnerability identified in the
> > Linux Kernel version 6.13.0-rc2. This issue was discovered using our
> > custom vulnerability discovery tool.
> > 
> > HEAD commit: fac04efc5c793dccbd07e2d59af9f90b7fc0dca4 (tag: v6.13-rc2)
> > 
> > Affected File: mm/util.c
> > 
> > File: mm/util.c
> > 
> > Function: __kvmalloc_node_noprof
> 
> (cc netfilter-devel)
> 
> This is
> 
> 	/* Don't even allow crazy sizes */
> 	if (unlikely(size > INT_MAX)) {
> 		WARN_ON_ONCE(!(flags & __GFP_NOWARN));
> 		return NULL;
> 	}
> 
> in __kvmalloc_node_noprof().

Ok, then I assume this is a WARN_ON_ONCE splat.

I'm attaching a patch to address this.

View attachment "x.patch" of type "text/x-diff" (670 bytes)