Re: [PATCH bpf] bpf: Fix the test_task_vma selftest to support output shorter than 1 kB

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann [off-list ref]:

On Tue, 30 Nov 2021 20:18:11 +0200 you wrote:

The test for bpf_iter_task_vma assumes that the output will be longer
than 1 kB, as the comment above the loop says. Due to this assumption,
the loop becomes infinite if the output turns to be shorter than 1 kB.
The return value of read_fd_into_buffer is 0 when the end of file was
reached, and len isn't being increased any more.

This commit adds a break on EOF to handle short output correctly. For
the reference, this is the contents that I get when running test_progs
under vmtest.sh, and it's shorter than 1 kB:

[...]

Here is the summary with links:
  - [bpf] bpf: Fix the test_task_vma selftest to support output shorter than 1 kB
    https://git.kernel.org/bpf/bpf-next/c/da54ab14953c

You are awesome, thank you!
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