netdev - Re: [PATCH net] bpf: do not disable/enable BH in bpf_map_free

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]

Date:   Tue, 19 Sep 2017 10:36:18 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Eric Dumazet <eric.dumazet@...il.com>
CC:     David Miller <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] bpf: do not disable/enable BH in bpf_map_free_id()

On Tue, Sep 19, 2017 at 04:15:59PM +0000, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> syzkaller reported following splat [1]
> 
> Since hard irq are disabled by the caller, bpf_map_free_id()
> should not try to enable/disable BH.
> 
> Another solution would be to change htab_map_delete_elem() to
> defer the free_htab_elem() call after
> raw_spin_unlock_irqrestore(&b->lock, flags), but this might be not
> enough to cover other code paths.
Thanks for fixing it.

Acked-by: Martin KaFai Lau <kafai@...com>