From: Oleg Nesterov <oleg@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Colin Cross <ccross@android.com>, Hugh Dickins <hughd@google.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
"Hampson, Steven T" <steven.t.hampson@intel.com>,
lkml <linux-kernel@vger.kernel.org>,
Kyungmin Park <kmpark@infradead.org>,
Christoph Hellwig <hch@infradead.org>,
John Stultz <john.stultz@linaro.org>,
Rob Landley <rob@landley.net>, Arnd Bergmann <arnd@arndb.de>,
Cyrill Gorcunov <gorcunov@openvz.org>,
David Rientjes <rientjes@google.com>,
Davidlohr Bueso <dave@gnu.org>, Kees Cook <keescook@chromium.org>,
Al Viro <viro@zeniv.linux.org.uk>, Mel Gorman <mgorman@suse.de>,
Michel Lespinasse <walken@google.com>,
Rik van Riel <riel@redhat.com>,
Konstantin Khlebnikov <khlebnikov@openvz.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Rusty Russell <rusty@rustcorp.com.au>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Michal Hocko <mhocko@suse.cz>,
Anton Vorontsov <anton.vorontsov@linaro.org>,
Pekka Enberg <penberg@kernel.org>, Shaohua Li <shli@fusionio.com>,
Sasha Levin <sasha.levin@oracle.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Ingo Molnar <mingo@kernel.org>,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
"open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>,
"open list:GENERIC INCLUDE/A..." <linux-arch@vger.kernel.org>
Subject: Re: [PATCH 1/1] mm: mempolicy: fix mbind_range() && vma_adjust() interaction
Date: Wed, 10 Jul 2013 17:45:38 +0200 [thread overview]
Message-ID: <20130710154538.GA21145@redhat.com> (raw)
In-Reply-To: <20130709145645.bd48e31c1a7d9e83d521b845@linux-foundation.org>
On 07/09, Andrew Morton wrote:
>
> On Mon, 8 Jul 2013 20:05:01 +0200 Oleg Nesterov <oleg@redhat.com> wrote:
>
> > Change mbind_range() to recheck mpol_equal() after vma_merge() to
> > fix the problem 1444f92c tried to address.
>
> So I assume the kernel still passes Steven's testcase from the
> 1444f92c changelog?
Yes.
Just in case, I had to modify it a little bit so that it can be compiled
on my machine. But this test-case is not reliable afaics. It should fail
(without 1444f92c or this fix) only if the subsequent get_unmapped_area()
allocates the region "right before" the previous mmap.
Please see the simplified and robust test-case below.
Oleg.
int main(void)
{
unsigned long mask[MAXNODE] = { 1 };
int pgsz = getpagesize();
int policy = -1;
unsigned char *p;
p = mmap(NULL, 2 * pgsz, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0);
assert(p != MAP_FAILED);
assert(syscall(__NR_mbind, p + pgsz, pgsz, MPOL_BIND, mask, MAXNODE, 0) == 0);
assert(syscall(__NR_mbind, p, pgsz, MPOL_BIND, mask, MAXNODE, 0) == 0);
assert(syscall(__NR_get_mempolicy, &policy, NULL, 0, p, MPOL_F_ADDR) == 0);
assert(policy == MPOL_BIND);
return 0;
}
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next prev parent reply other threads:[~2013-07-10 15:51 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-04 1:31 [PATCH] mm: add sys_madvise2 and MADV_NAME to name vmas Colin Cross
2013-07-04 4:54 ` Eric W. Biederman
2013-07-04 6:32 ` Colin Cross
2013-07-05 16:52 ` Oleg Nesterov
2013-07-06 6:33 ` Pekka Enberg
2013-07-06 11:53 ` Eric W. Biederman
2013-07-07 18:35 ` Colin Cross
2013-07-14 1:38 ` Simon Jeons
2013-07-04 8:56 ` Peter Zijlstra
2013-07-05 20:25 ` Colin Cross
2013-07-10 23:20 ` Dave Hansen
2013-07-04 20:22 ` Oleg Nesterov
2013-07-05 19:40 ` Colin Cross
2013-07-08 18:04 ` [PATCH 0/1] mm: mempolicy: (Was: add sys_madvise2 and MADV_NAME to name vmas) Oleg Nesterov
2013-07-08 18:05 ` [PATCH 1/1] mm: mempolicy: fix mbind_range() && vma_adjust() interaction Oleg Nesterov
2013-07-08 22:29 ` KOSAKI Motohiro
2013-07-09 15:28 ` Oleg Nesterov
2013-07-09 19:43 ` Oleg Nesterov
2013-07-10 2:49 ` KOSAKI Motohiro
2013-07-09 21:56 ` Andrew Morton
2013-07-10 15:45 ` Oleg Nesterov [this message]
2013-07-24 9:40 ` [PATCH] mm: add sys_madvise2 and MADV_NAME to name vmas Jan Glauber
2013-07-24 20:05 ` Colin Cross
2013-07-10 23:08 ` Dave Hansen
[not found] ` <CAMbhsRTio2mS=azWTxSdRdaZJRRf5FfMNoQUZmrFjkB7kv9LSQ@mail.gmail.com>
2013-07-10 23:38 ` Dave Hansen
[not found] ` <CAMbhsRTs45QE1ze6mvdiL2QYKD0dHjXoRk7o1h2Y_rYP80ckDg@mail.gmail.com>
2013-07-11 0:19 ` Dave Hansen
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