lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 15 Feb 2022 12:42:59 -0800 From: Yang Shi <shy828301@...il.com> To: Suren Baghdasaryan <surenb@...gle.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Michal Hocko <mhocko@...nel.org>, Michal Hocko <mhocko@...e.com>, David Rientjes <rientjes@...gle.com>, Matthew Wilcox <willy@...radead.org>, Johannes Weiner <hannes@...xchg.org>, Roman Gushchin <guro@...com>, Rik van Riel <riel@...riel.com>, Minchan Kim <minchan@...nel.org>, "Kirill A. Shutemov" <kirill@...temov.name>, Andrea Arcangeli <aarcange@...hat.com>, brauner@...nel.org, christian@...uner.io, Christoph Hellwig <hch@...radead.org>, Oleg Nesterov <oleg@...hat.com>, David Hildenbrand <david@...hat.com>, Jann Horn <jannh@...gle.com>, Shakeel Butt <shakeelb@...gle.com>, luto@...nel.org, christian.brauner@...ntu.com, fweimer@...hat.com, jengelh@...i.de, timmurray@...gle.com, Linux MM <linux-mm@...ck.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, kernel-team@...roid.com, syzbot+2ccf63a4bd07cf39cab0@...kaller.appspotmail.com Subject: Re: [PATCH 1/1] mm: fix use-after-free bug when mm->mmap is reused after being freed On Tue, Feb 15, 2022 at 12:19 PM Suren Baghdasaryan <surenb@...gle.com> wrote: > > After exit_mmap frees all vmas in the mm, mm->mmap needs to be reset, > otherwise it points to a vma that was freed and when reused leads to > a use-after-free bug. > > Reported-by: syzbot+2ccf63a4bd07cf39cab0@...kaller.appspotmail.com > Suggested-by: Michal Hocko <mhocko@...e.com> > Signed-off-by: Suren Baghdasaryan <surenb@...gle.com> Looks good to me. Reviewed-by: Yang Shi <shy828301@...il.com> > --- > mm/mmap.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/mm/mmap.c b/mm/mmap.c > index 1e8fdb0b51ed..d445c1b9d606 100644 > --- a/mm/mmap.c > +++ b/mm/mmap.c > @@ -3186,6 +3186,7 @@ void exit_mmap(struct mm_struct *mm) > vma = remove_vma(vma); > cond_resched(); > } > + mm->mmap = NULL; > mmap_write_unlock(mm); > vm_unacct_memory(nr_accounted); > } > -- > 2.35.1.265.g69c8d7142f-goog >
Powered by blists - more mailing lists