From: David Howells <dhowells@redhat.com>
To: unlisted-recipients:; (no To-header on input)
Cc: dhowells@redhat.com,
"Linus Torvalds" <torvalds@linux-foundation.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
linux-afs@lists.infradead.org,
"Pali Rohár" <pali.rohar@gmail.com>
Subject: Re: [PATCH] afs: proc cells and rootcell are writeable
Date: Fri, 31 Jan 2014 00:31:21 +0000 [thread overview]
Message-ID: <3349.1391128281@warthog.procyon.org.uk> (raw)
In-Reply-To: <3301.1391128114@warthog.procyon.org.uk>
David Howells <dhowells@redhat.com> wrote:
> > > I think this is a pretty strong argument. Counter-arguments, anybody?
> >
> > Yes. CAP_DAC_READ_SEARCH.
>
> No, it would seem unlikely it's that, but I guess there's another capability
> override because the process is owned by root.
CAP_DAC_OVERRIDE, I think.
int generic_permission(struct inode *inode, int mask)
{
...
/*
* Read/write DACs are always overridable.
* Executable DACs are overridable when there is
* at least one exec bit set.
*/
if (!(mask & MAY_EXEC) || (inode->i_mode & S_IXUGO))
if (inode_capable(inode, CAP_DAC_OVERRIDE))
return 0;
...
}
David
next prev parent reply other threads:[~2014-01-31 0:31 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-26 12:27 David Howells
2014-01-26 19:23 ` Linus Torvalds
2014-01-26 20:19 ` Ingo Molnar
2014-01-26 20:22 ` Ingo Molnar
2014-01-26 20:25 ` Ingo Molnar
2014-01-28 8:39 ` Geert Uytterhoeven
2014-01-28 12:04 ` Ingo Molnar
2014-01-28 12:17 ` Geert Uytterhoeven
2014-01-28 12:20 ` Ingo Molnar
2014-01-28 17:34 ` Joe Perches
2014-01-28 20:20 ` David Howells
2014-01-28 20:27 ` Al Viro
2014-01-28 20:56 ` David Howells
2014-01-30 21:48 ` Eric W. Biederman
2014-01-30 21:50 ` Linus Torvalds
2014-01-30 22:15 ` Pali Rohár
2014-01-30 22:27 ` Linus Torvalds
2014-01-30 22:36 ` Dave Jones
2014-01-30 22:33 ` Russ Allbery
2014-01-31 0:21 ` David Howells
2014-01-31 0:28 ` David Howells
2014-01-31 0:31 ` David Howells [this message]
2014-01-31 0:07 ` David Howells
2014-01-31 0:20 ` David Howells
-- strict thread matches above, loose matches on Subject: below --
2014-01-27 12:33 Alexey Dobriyan
2013-11-20 13:30 Pali Rohár
2013-12-10 8:02 ` Pali Rohár
2013-12-16 7:00 ` Andrew Morton
2013-12-17 13:19 ` Pali Rohár
2013-12-17 18:31 ` David Howells
2013-12-31 9:59 ` Pali Rohár
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