From: Lorenzo Stoakes <lstoakes@gmail.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Jan Kara <jack@suse.cz>,
linux-mm@kvack.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Rik van Riel <riel@redhat.com>,
Mel Gorman <mgorman@techsingularity.net>,
Andrew Morton <akpm@linux-foundation.org>,
adi-buildroot-devel@lists.sourceforge.net,
ceph-devel@vger.kernel.org, dri-devel@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org, kvm@vger.kernel.org,
linux-alpha@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-cris-kernel@axis.com,
linux-fbdev@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-media@vger.kernel.org, linux-mips@linux-mips.org,
linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org,
linux-samsung-soc@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-security-module@vger.kernel.org, linux-sh@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org,
sparclinux@vger.kernel.org, x86@kernel.org
Subject: Re: [PATCH 08/10] mm: replace __access_remote_vm() write parameter with gup_flags
Date: Wed, 19 Oct 2016 10:06:46 +0100 [thread overview]
Message-ID: <20161019090646.GA24243@lucifer> (raw)
In-Reply-To: <20161019085204.GD7517@dhcp22.suse.cz>
On Wed, Oct 19, 2016 at 10:52:05AM +0200, Michal Hocko wrote:
> yes this is the desirable and expected behavior.
>
> > wonder if this is desirable behaviour or whether this ought to be limited to
> > ptrace system calls. Regardless, by making the flag more visible it makes it
> > easier to see that this is happening.
>
> mem_open already enforces PTRACE_MODE_ATTACH
Ah I missed this, that makes a lot of sense, thanks!
I still wonder whether other invocations of access_remote_vm() in fs/proc/base.c
(the principle caller of this function) need FOLL_FORCE, for example the various
calls that simply read data from other processes, so I think the point stands
about keeping this explicit.
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next prev parent reply other threads:[~2016-10-19 9:06 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-13 0:20 [PATCH 00/10] mm: adjust get_user_pages* functions to explicitly pass FOLL_* flags Lorenzo Stoakes
2016-10-13 0:20 ` [PATCH 01/10] mm: remove write/force parameters from __get_user_pages_locked() Lorenzo Stoakes
2016-10-18 12:43 ` Jan Kara
2016-10-13 0:20 ` [PATCH 02/10] mm: remove write/force parameters from __get_user_pages_unlocked() Lorenzo Stoakes
2016-10-13 6:54 ` Paolo Bonzini
2016-10-18 12:46 ` Jan Kara
2016-10-13 0:20 ` [PATCH 03/10] mm: replace get_user_pages_unlocked() write/force parameters with gup_flags Lorenzo Stoakes
2016-10-18 12:50 ` Jan Kara
2016-10-13 0:20 ` [PATCH 04/10] mm: replace get_user_pages_locked() " Lorenzo Stoakes
2016-10-18 12:54 ` Jan Kara
2016-10-18 13:56 ` Lorenzo Stoakes
2016-10-19 7:32 ` Jan Kara
2016-10-19 7:33 ` Jan Kara
2016-10-13 0:20 ` [PATCH 05/10] mm: replace get_vaddr_frames() " Lorenzo Stoakes
2016-10-19 7:34 ` Jan Kara
2016-10-13 0:20 ` [PATCH 06/10] mm: replace get_user_pages() " Lorenzo Stoakes
2016-10-17 9:22 ` Jesper Nilsson
2016-10-19 7:44 ` Jan Kara
2016-10-13 0:20 ` [PATCH 07/10] mm: replace get_user_pages_remote() " Lorenzo Stoakes
2016-10-19 7:47 ` Jan Kara
2016-10-13 0:20 ` [PATCH 08/10] mm: replace __access_remote_vm() write parameter " Lorenzo Stoakes
2016-10-19 7:59 ` Jan Kara
2016-10-19 8:13 ` Michal Hocko
2016-10-19 8:40 ` Lorenzo Stoakes
2016-10-19 8:52 ` Michal Hocko
2016-10-19 9:06 ` Lorenzo Stoakes [this message]
2016-10-19 9:23 ` Michal Hocko
2016-10-13 0:20 ` [PATCH 09/10] mm: replace access_remote_vm() " Lorenzo Stoakes
2016-10-13 0:20 ` [PATCH 10/10] mm: replace access_process_vm() " Lorenzo Stoakes
2016-10-17 9:23 ` Jesper Nilsson
2016-10-19 11:10 ` Michael Ellerman
2016-10-13 7:32 ` [PATCH 00/10] mm: adjust get_user_pages* functions to explicitly pass FOLL_* flags Christian König
2016-10-18 15:30 ` Michal Hocko
2016-10-19 8:58 ` Lorenzo Stoakes
2016-10-19 9:07 ` Michal Hocko
2016-10-19 16:49 ` Dave Hansen
2016-10-19 17:01 ` Michal Hocko
2016-10-19 17:23 ` Dave Hansen
2016-10-20 19:26 ` Michal Hocko
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