Hello:
This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@xxxxxxxxxx>:
On Thu, 21 Mar 2024 15:39:39 +0000 you wrote:
> The verifier currently converts addr_space_cast from as(1) to as(0) that
> is: BPF_ALU64 | BPF_MOV | BPF_X with off=1 and imm=1
> to
> BPF_ALU | BPF_MOV | BPF_X with imm=1 (32-bit mov)
>
> Because of this imm=1, the JITs that have bpf_jit_needs_zext() == true,
> interpret the converted instruction as BPF_ZEXT_REG(DST) which is a
> special form of mov32, used for doing explicit zero extension on dst.
> These JITs will just zero extend the dst reg and will not move the src to
> dst before the zext.
>
> [...]
Here is the summary with links:
- [RESEND,bpf] bpf: verifier: fix addr_space_cast from as(1) to as(0)
https://git.kernel.org/bpf/bpf/c/c49cdf5b88aa
You are awesome, thank you!
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