linux-kernel - Re: [git pull] coredump infoleak fix

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Message-ID: <20200528074442.GB790247@gmail.com>
Date:   Thu, 28 May 2020 09:44:42 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [git pull] coredump infoleak fix


* Al Viro <viro@...iv.linux.org.uk> wrote:

> On Thu, May 28, 2020 at 09:02:55AM +0200, Ingo Molnar wrote:
> 
> > Looks good to me.
> > 
> > I'm wondering, shouldn't we also zero-initialize the dump data to 
> > begin with? See the patch below (untested).
> 
> Note that this hides the bug from KASAN, though ;-)  And the bug
> is not just infoleak - not all components are "all zeroes" in the
> init state.

Yeah, but is zero-init really a problem though? Wouldn't it be 
'better' to have all zeroes if the dump doesn't fit? But I might be 
missing something ...

Thanks,

	Ingo