Re: frequent lockups in 3.18rc4

[Linus Torvalds]

On Mon, Dec 1, 2014 at 10:25 AM, Kirill A. Shutemov
<kirill@xxxxxxxxxxxxx> 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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