linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <CA+55aFz+ODi34J2n0kzXm+v++B7KW1e9NSFU=f-jgonPA1bNxg@mail.gmail.com>
Date:	Mon, 1 Dec 2014 10:36:04 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Will Deacon <will.deacon@....com>, Tejun Heo <tj@...nel.org>,
	Dave Jones <davej@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Don Zickus <dzickus@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: frequent lockups in 3.18rc4

On Mon, Dec 1, 2014 at 10:25 AM, Kirill A. Shutemov
<kirill@...temov.name> wrote:
>
> No idea about oom_score, but kernel happily accepts chmod on any file
> under /proc/PID/net/.

/proc used to accept that fairly widely, but no, we tightened things
down, and core /proc files end up not accepting chmod. See
'proc_setattr()':

        if (attr->ia_valid & ATTR_MODE)
                return -EPERM;

although particular /proc files could choose to not use 'proc_setattr'
if they want to.

The '/proc/pid/net' subtree is obviously not doing that. No idea why,
and probably for no good reason.

                     Linus
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