[PATCH RFC bpf-next 0/3] bpf: report probe fault to BPF stderr · Menglong Dong <hidden> · 2025-09-27
[PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Menglong Dong <hidden> · 2025-09-27
Re: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Alexei Starovoitov <hidden> · 2025-10-02
Re: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Menglong Dong <hidden> · 2025-10-07
Re: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Leon Hwang <hidden> · 2025-10-08
bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Alexei Starovoitov <hidden> · 2025-10-08
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Kumar Kartikeya Dwivedi <memxor@gmail.com> · 2025-10-08
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Eduard Zingerman <eddyz87@gmail.com> · 2025-10-08
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Kumar Kartikeya Dwivedi <memxor@gmail.com> · 2025-10-08
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Eduard Zingerman <eddyz87@gmail.com> · 2025-10-08
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Kumar Kartikeya Dwivedi <memxor@gmail.com> · 2025-10-08
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Leon Hwang <hidden> · 2025-10-09
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Leon Hwang <hidden> · 2025-10-09
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Menglong Dong <hidden> · 2025-10-10
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Menglong Dong <hidden> · 2025-10-10
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Eduard Zingerman <eddyz87@gmail.com> · 2025-10-10
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Menglong Dong <hidden> · 2025-10-11
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Leon Hwang <hidden> · 2025-10-09
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Alexei Starovoitov <hidden> · 2025-10-09
Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr · Leon Hwang <hidden> · 2025-10-10
[PATCH RFC bpf-next 2/3] x86,bpf: use bpf_prog_report_probe_violation for x86 · Menglong Dong <hidden> · 2025-09-27
[PATCH RFC bpf-next 3/3] selftests/bpf: add testcase for probe read fault · Menglong Dong <hidden> · 2025-09-27

Re: bpf_errno. Was: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr

From: Alexei Starovoitov <hidden>
Date: 2025-10-09 14:46:11
Also in: bpf, lkml

On Thu, Oct 9, 2025 at 7:15 AM Leon Hwang [off-list ref] wrote:


The verifier can rewrite 'bpf_reg_aux()' into the following instructions:

dst_reg = BPF_REG_AUX;
BPF_REG_AUX = 0; /* clear BPF_REG_AUX */

As for the architecture-specific implementation, BPF_REG_AUX can be
mapped to an appropriate register per arch — for example, r11 on x86_64.

it's taken. There are no free registers.

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