linux-kernel - Re: [PATCH bpf-next v5 5/5] selftests/bpf: Add test for open coded dmabuf

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]

Message-ID: <CAPhsuW6KEtKu5C+Y_X3EFkUFSg8=LnQ9nJFUD81rYgwvBvqzHg@mail.gmail.com>
Date: Mon, 12 May 2025 13:29:43 -0700
From: Song Liu <song@...nel.org>
To: "T.J. Mercier" <tjmercier@...gle.com>
Cc: sumit.semwal@...aro.org, christian.koenig@....com, ast@...nel.org, 
	daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev, 
	skhan@...uxfoundation.org, alexei.starovoitov@...il.com, 
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org, 
	bpf@...r.kernel.org, linux-kselftest@...r.kernel.org, android-mm@...gle.com, 
	simona@...ll.ch, eddyz87@...il.com, yonghong.song@...ux.dev, 
	john.fastabend@...il.com, kpsingh@...nel.org, sdf@...ichev.me, 
	jolsa@...nel.org, mykolal@...com, shuah@...nel.org
Subject: Re: [PATCH bpf-next v5 5/5] selftests/bpf: Add test for open coded dmabuf_iter

On Mon, May 12, 2025 at 10:41 AM T.J. Mercier <tjmercier@...gle.com> wrote:
>
> Use the same test buffers as the traditional iterator and a new BPF map
> to verify the test buffers can be found with the open coded dmabuf
> iterator.
>
> Signed-off-by: T.J. Mercier <tjmercier@...gle.com>
> Acked-by: Christian König <christian.koenig@....com>

Acked-by: Song Liu <song@...nel.org>

With a nitpick below.

[...]

>
> -static int create_test_buffers(void)
> +static int create_test_buffers(int map_fd)
>  {
> +       bool f = false;
> +
>         udmabuf = create_udmabuf();
>         sysheap_dmabuf = create_sys_heap_dmabuf();
>
>         if (udmabuf < 0 || sysheap_dmabuf < 0)
>                 return -1;
>
> -       return 0;
> +       return bpf_map_update_elem(map_fd, udmabuf_test_buffer_name, &f, BPF_ANY) ||
> +              bpf_map_update_elem(map_fd, sysheap_test_buffer_name, &f, BPF_ANY);

nit: Instead of passing map_fd in here, we can just call
bpf_map_update_elem() in test_dmabuf_iter()

[...]