On Thu 05-10-17 18:33:20, Oleg Nesterov wrote:
> On 10/04, Michal Hocko wrote:
> >
> > On Wed 04-10-17 23:12:38, Baoquan He wrote:
> > > if (total_size) {
> > > total_size = ELF_PAGEALIGN(total_size);
> > > - map_addr = vm_mmap(filep, addr, total_size, prot, flags, off);
> > > -
On 10/04, Michal Hocko wrote:
>
> On Wed 04-10-17 23:12:38, Baoquan He wrote:
> > if (total_size) {
> > total_size = ELF_PAGEALIGN(total_size);
> > - map_addr = vm_mmap(filep, addr, total_size, prot, flags, off);
> > - if (!BAD_ADDR(map_addr))
> > -
On Wed 04-10-17 10:15:31, Linus Torvalds wrote:
> On Wed, Oct 4, 2017 at 10:12 AM, Michal Hocko wrote:
> >
> > Yes, but we already have a new stack mapped and that was the point of
> > the referenced CVE where the binary segments got mapped over the stack
> > AFAIU.
>
> Well, if you control the b
On Wed, Oct 4, 2017 at 10:12 AM, Michal Hocko wrote:
>
> Yes, but we already have a new stack mapped and that was the point of
> the referenced CVE where the binary segments got mapped over the stack
> AFAIU.
Well, if you control the binary to the point where you just make the
ELF section map on
On Wed 04-10-17 23:37:41, Baoquan He wrote:
> On 10/04/17 at 05:17pm, Michal Hocko wrote:
> > On Wed 04-10-17 23:12:38, Baoquan He wrote:
> > > I made a clean up patch according to Oleg's suggestion. It's trying to
> > > get an map area to cover total_size, then do mmap for for the 1st
> > > progra
On 10/04/17 at 05:17pm, Michal Hocko wrote:
> On Wed 04-10-17 23:12:38, Baoquan He wrote:
> > I made a clean up patch according to Oleg's suggestion. It's trying to
> > get an map area to cover total_size, then do mmap for for the 1st
> > program segment only. Not sure if this way is correct.
> >
On Wed 04-10-17 23:12:38, Baoquan He wrote:
> I made a clean up patch according to Oleg's suggestion. It's trying to
> get an map area to cover total_size, then do mmap for for the 1st
> program segment only. Not sure if this way is correct.
>
> >From 40f231bb78a74caebcb4a898089a9fa5323be05f Mon S
On Wed 04-10-17 23:03:34, Baoquan He wrote:
> On 10/04/17 at 09:50am, Michal Hocko wrote:
> > Hi,
> > while studying CVE-2017-1000253 and the MAP_FIXED usage in load_elf*
> > code paths I have stumbled over MAP_FIXED usage for elf segments
> > mapping. I am not really familiar with this area much s
I made a clean up patch according to Oleg's suggestion. It's trying to
get an map area to cover total_size, then do mmap for for the 1st
program segment only. Not sure if this way is correct.
>From 40f231bb78a74caebcb4a898089a9fa5323be05f Mon Sep 17 00:00:00 2001
From: Baoquan He
Date: Fri, 29 Se
On 10/04/17 at 09:50am, Michal Hocko wrote:
> Hi,
> while studying CVE-2017-1000253 and the MAP_FIXED usage in load_elf*
> code paths I have stumbled over MAP_FIXED usage for elf segments
> mapping. I am not really familiar with this area much so I might draw
> completely incorrect conclusions here
Dohh, screwed up From. Sorry for spamming.
On Wed 04-10-17 09:50:59, Michal Hocko wrote:
> Hi,
> while studying CVE-2017-1000253 and the MAP_FIXED usage in load_elf*
> code paths I have stumbled over MAP_FIXED usage for elf segments
> mapping. I am not really familiar with this area much so I migh
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