netdev - Re: [PATCH bpf] bpf: fix bug in mmap() implementation for BPF array map

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Date:   Tue, 12 May 2020 20:19:57 -0700
From:   Yonghong Song <yhs@...com>
To:     Andrii Nakryiko <andriin@...com>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>, <ast@...com>, <daniel@...earbox.net>
CC:     <andrii.nakryiko@...il.com>, <kernel-team@...com>
Subject: Re: [PATCH bpf] bpf: fix bug in mmap() implementation for BPF array
 map



On 5/12/20 4:59 PM, Andrii Nakryiko wrote:
> mmap() subsystem allows user-space application to memory-map region with
> initial page offset. This wasn't taken into account in initial implementation
> of BPF array memory-mapping. This would result in wrong pages, not taking into
> account requested page shift, being memory-mmaped into user-space. This patch
> fixes this gap and adds a test for such scenario.
> 
> Fixes: fc9702273e2e ("bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY")
> Signed-off-by: Andrii Nakryiko <andriin@...com>
Acked-by: Yonghong Song <yhs@...com>