linux-kernel - Re: [PATCH] fs: use kvmalloc for big coredump file

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Message-ID: <YyaFrarLHYW3HSnu@ZenIV>
Date:   Sun, 18 Sep 2022 03:42:53 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Zhaoyang Huang <huangzhaoyang@...il.com>
Cc:     "zhaoyang.huang" <zhaoyang.huang@...soc.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        LKML <linux-kernel@...r.kernel.org>, Ke Wang <ke.wang@...soc.com>
Subject: Re: [PATCH] fs: use kvmalloc for big coredump file

On Sun, Sep 18, 2022 at 10:29:10AM +0800, Zhaoyang Huang wrote:
> loop Eric W
> 
> On Tue, Aug 30, 2022 at 2:56 PM zhaoyang.huang
> <zhaoyang.huang@...soc.com> wrote:
> >
> > From: Zhaoyang Huang <zhaoyang.huang@...soc.com>
> >
> > High order page allocation observed which even introduce kernel panic when generating
> > coredump file, use kvmalloc_array instead of kmalloc_array

Frankly, I would rather cap argc here - if you are trying to feed that many arguments
to your userland helper, your core_pattern is probably bogus.