linux-kernel - Re: [PATCH 3/6] binfmt_elf: remove the set_fs(KERNEL_DS) in elf_core

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Message-ID: <20200406130351.GA16479@lst.de>
Date:   Mon, 6 Apr 2020 15:03:51 +0200
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jeremy Kerr <jk@...abs.org>, Arnd Bergmann <arnd@...db.de>,
        linuxppc-dev@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] binfmt_elf: remove the set_fs(KERNEL_DS) in
 elf_core_dump

On Mon, Apr 06, 2020 at 02:02:38PM +0100, Al Viro wrote:
> On Mon, Apr 06, 2020 at 02:03:09PM +0200, Christoph Hellwig wrote:
> > There is no logic in elf_core_dump itself that uses uaccess routines
> > on kernel pointers, the file writes are nicely encapsulated in dump_emit
> > which does its own set_fs.
> 
> ... assuming you've checked the asm/elf.h to see that nobody is playing
> silly buggers in these forests of macros and the stuff called from those.
> Which is a feat that ought to be mentioned in commit message...

None of the calls should go into asm/elf.h headers, but some go to
various out of line arch callouts.  And I did look through those - spufs
was the only funky one.