linux-kernel - Re: [V9fs-developer] [PATCH] 9p: fix Use-After-Free in p9_write

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180730001800.GA5960@nautica>
Date:   Mon, 30 Jul 2018 02:18:00 +0200
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Tomas Bortoli <tomasbortoli@...il.com>
Cc:     v9fs-developer@...ts.sourceforge.net, syzkaller@...glegroups.com,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [V9fs-developer] [PATCH] 9p: fix Use-After-Free in
 p9_write_work()

Dominique Martinet wrote on Mon, Jul 30, 2018:
> Basically, a more global view of the problem is a race between
> p9_tag_lookup returning a p9_req_t and another thread freeing it.

(just correcting myself here, p9_tag_lookup won't be enough for the
write side, but similarily you'd just need to increment the refcount
when you schedule work with it and decrement when the worker is done)

-- 
Dominique