linux-kernel - Re: [PATCH v8 1/4] fs/proc/kcore: avoid bounce buffer for ktext data

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Message-ID: <86fd0ccb-f460-651f-8048-1026d905a2d6@redhat.com>
Date:   Mon, 24 Jul 2023 08:23:55 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Baoquan He <bhe@...hat.com>, Jiri Olsa <olsajiri@...il.com>
Cc:     Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Liu Shixin <liushixin2@...wei.com>,
        Jens Axboe <axboe@...nel.dk>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v8 1/4] fs/proc/kcore: avoid bounce buffer for ktext data

Hi,

> 
> I met this too when I executed below command to trigger a kcore reading.
> I wanted to do a simple testing during system running and got this.
> 
>    makedumpfile --mem-usage /proc/kcore
> 
> Later I tried your above objdump testing, it corrupted system too.
> 

What do you mean with "corrupted system too" --  did it not only fail to 
dump the system, but also actually harmed the system?

@Lorenzo do you plan on reproduce + fix, or should we consider reverting 
that change?

-- 
Cheers,

David / dhildenb