netdev - Re: [PATCH bpf 0/5] bpf: fix map permissions check and cleanup code around

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Message-ID: <20200528143928.GA27756@pc-9.home>
Date:   Thu, 28 May 2020 16:39:28 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Anton Protopopov <a.s.protopopov@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf 0/5] bpf: fix map permissions check and cleanup code
 around

On Wed, May 27, 2020 at 06:56:55PM +0000, Anton Protopopov wrote:
> This series fixes a bug in the map_lookup_and_delete_elem() function which
> should check for the FMODE_CAN_READ bit, because it returns data to user space.
> The rest of commits fix some typos and comment in selftests and extend the
> test_map_wronly test to cover the new check for the BPF_MAP_TYPE_STACK and
> BPF_MAP_TYPE_QUEUE map types.
> 
> Anton Protopopov (5):
>   selftests/bpf: fix a typo in test_maps
>   selftests/bpf: cleanup some file descriptors in test_maps
>   selftests/bpf: cleanup comments in test_maps
>   bpf: fix map permissions check
>   selftests/bpf: add tests for write-only stacks/queues
> 
>  kernel/bpf/syscall.c                    |  3 +-
>  tools/testing/selftests/bpf/test_maps.c | 52 ++++++++++++++++++++++---
>  2 files changed, 49 insertions(+), 6 deletions(-)

Looks good to me and is also consistent with what we do for the lookup +
delete batch interface, applied thanks!

Fyi, I've taken it to bpf-next given 5.7 is right around the corner. We
can take the permissions fix to stable once in Linus' tree.