From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
netdev <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
syzkaller <syzkaller@googlegroups.com>,
Kostya Serebryany <kcc@google.com>,
Alexander Potapenko <glider@google.com>,
Eric Dumazet <edumazet@google.com>,
Sasha Levin <sasha.levin@oracle.com>,
daniel@iogearbox.net
Subject: Re: user-controllable kmalloc size in bpf syscall
Date: Sun, 29 Nov 2015 10:21:50 -0800 [thread overview]
Message-ID: <20151129182149.GA79352@ast-mbp.thefacebook.com> (raw)
In-Reply-To: <CACT4Y+b1k7Ofvn6xa=qWv9xP6BbteWOnZsJMXLZ=GOby-ajF=w@mail.gmail.com>
On Sun, Nov 29, 2015 at 02:18:29PM +0100, Dmitry Vyukov wrote:
> ca.key_size = 1;
> ca.value_size = 0xfffffff9;
> ca.max_entries = 10;
> int fd = syscall(SYS_bpf, BPF_MAP_CREATE, &ca, sizeof(ca));
...
> ------------[ cut here ]------------
> WARNING: CPU: 2 PID: 11122 at mm/page_alloc.c:2989
> __alloc_pages_nodemask+0x695/0x14e0()
thanks for the report. That's an integer overflow :(
working on the fix.
next prev parent reply other threads:[~2015-11-29 18:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-29 13:18 user-controllable kmalloc size in bpf syscall Dmitry Vyukov
2015-11-29 18:21 ` Alexei Starovoitov [this message]
2015-11-30 0:59 ` [PATCH net] bpf: fix allocation warnings in bpf maps and integer overflow Alexei Starovoitov
2015-11-30 13:52 ` Daniel Borkmann
2015-11-30 13:57 ` Dmitry Vyukov
2015-11-30 14:13 ` Daniel Borkmann
2015-11-30 14:16 ` Dmitry Vyukov
2015-11-30 14:34 ` Daniel Borkmann
2015-11-30 18:13 ` Alexei Starovoitov
2015-11-30 22:16 ` Daniel Borkmann
2015-11-30 23:30 ` Alexei Starovoitov
2015-12-03 4:36 ` David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20151129182149.GA79352@ast-mbp.thefacebook.com \
--to=alexei.starovoitov@gmail.com \
--cc=ast@kernel.org \
--cc=daniel@iogearbox.net \
--cc=dvyukov@google.com \
--cc=edumazet@google.com \
--cc=glider@google.com \
--cc=kcc@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=sasha.levin@oracle.com \
--cc=syzkaller@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).