netdev - Re: [PATCH net] bpf: fix verifier memory corruption

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Message-Id: <20150416.120700.1239591146749471799.davem@davemloft.net>
Date:	Thu, 16 Apr 2015 12:07:00 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ast@...mgrid.com
Cc:	daniel@...earbox.net, hannes@...essinduktion.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net] bpf: fix verifier memory corruption

From: Alexei Starovoitov <ast@...mgrid.com>
Date: Tue, 14 Apr 2015 15:57:13 -0700

> Due to missing bounds check the DAG pass of the BPF verifier can corrupt
> the memory which can cause random crashes during program loading:
> 
> [8.449451] BUG: unable to handle kernel paging request at ffffffffffffffff
> [8.451293] IP: [<ffffffff811de33d>] kmem_cache_alloc_trace+0x8d/0x2f0
> [8.452329] Oops: 0000 [#1] SMP
> [8.452329] Call Trace:
> [8.452329]  [<ffffffff8116cc82>] bpf_check+0x852/0x2000
> [8.452329]  [<ffffffff8116b7e4>] bpf_prog_load+0x1e4/0x310
> [8.452329]  [<ffffffff811b190f>] ? might_fault+0x5f/0xb0
> [8.452329]  [<ffffffff8116c206>] SyS_bpf+0x806/0xa30
> 
> Fixes: f1bca824dabb ("bpf: add search pruning optimization to verifier")
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>

Applied and queued up for -stable, thanks.
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