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Date: Fri, 4 Dec 2015 17:43:49 -0600 From: "Serge E. Hallyn" <serge.hallyn@...ntu.com> To: Theodore Ts'o <tytso@....edu>, Seth Forshee <seth.forshee@...onical.com>, "Serge E. Hallyn" <serge@...lyn.com>, "Eric W. Biederman" <ebiederm@...ssion.com>, Alexander Viro <viro@...iv.linux.org.uk>, Serge Hallyn <serge.hallyn@...onical.com>, Richard Weinberger <richard.weinberger@...il.com>, Austin S Hemmelgarn <ahferroin7@...il.com>, Miklos Szeredi <miklos@...redi.hu>, linux-bcache@...r.kernel.org, dm-devel@...hat.com, linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org, linux-fsdevel@...r.kernel.org, fuse-devel@...ts.sourceforge.net, linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov Subject: Re: [PATCH 14/19] fs: Permit FIBMAP for users with CAP_SYS_RAWIO in s_user_ns On Fri, Dec 04, 2015 at 06:11:52PM -0500, Theodore Ts'o wrote: > On Fri, Dec 04, 2015 at 02:45:32PM -0600, Seth Forshee wrote: > > On Fri, Dec 04, 2015 at 02:07:36PM -0600, Serge E. Hallyn wrote: > > > Heh, I was looking over http://www.gossamer-threads.com/lists/linux/kernel/103611 > > > a little while ago :) The same question was asked 16 years ago. Apparently > > > the answer then was that it was easier than fixing the code. > > > > So it seems then that either it still isn't safe and so unprivileged > > users shouldn't be allowed to do it at all, or else it's safe and we > > should drop the requirement completely. I can't say which is right, > > unfortunately. > > It may not have been safe 16 years agoo, but giving invalid arguments > to FIBMAP is safe for ext4 and ext2. This is the sort of thing that > tools like trinity should and does test for, so I think it should be > fine to remove the root check for FIBMAP. Seth, can I tempt you into sending a standalone patch to remove that? :) -serge -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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