Thread (4 messages) 4 messages, 4 authors, 2021-03-03

Re: [PATCH] bpf: selftests: test_verifier: mask bpf_csum_diff() return value to 16 bits

From: patchwork-bot+netdevbpf@kernel.org
Date: 2021-03-03 03:55:35

Hello:

This patch was applied to bpf/bpf.git (refs/heads/master):

On Sun, 28 Feb 2021 12:30:17 +0200 you wrote:
The verifier test labelled "valid read map access into a read-only array
2" calls the bpf_csum_diff() helper and checks its return value.
However, architecture implementations of csum_partial() (which is what
the helper uses) differ in whether they fold the return value to 16 bit
or not. For example, x86 version has:

	if (unlikely(odd)) {
		result = from32to16(result);
		result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
	}

[...]
Here is the summary with links:
  - bpf: selftests: test_verifier: mask bpf_csum_diff() return value to 16 bits
    https://git.kernel.org/bpf/bpf/c/cf14da96aa18

You are awesome, thank you!
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