From: "Alexei Starovoitov" <alexei.starovoitov@gmail.com>
To: "Yonghong Song" <yonghong.song@linux.dev>, <bpf@vger.kernel.org>
Cc: "Andrii Nakryiko" <andrii@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Eduard Zingerman" <eddyz87@gmail.com>, <kernel-team@fb.com>
Subject: Re: [PATCH bpf-next v10 09/24] bpf: Refuse a landing pad that does not resume
Date: Sat, 10 Oct 2026 15:08:55 +0000 [thread overview]
Message-ID: <DM194GWC0XHZ.10Q1AUS5TQYNO@gmail.com> (raw)
In-Reply-To: <20261009041534.27944-1-yonghong.song@linux.dev>
# CARRIED OVER from the unsent v9 draft (leftover of your v8 09 mail). Delete this line, or the file if you dropped it on purpose.
On Thu, Oct 08, 2026 at 09:15 PM Yonghong Song <yonghong.song@linux.dev> wrote:
> + if (unlikely(env->cleanup_info_cnt)) {
> + err = bpf_exc_check_insn(env, insn);
> + if (error_recoverable_with_nospec(err) && state->speculative) {
> + insn_aux->nospec = true;
> + goto process_bpf_exit;
> + }
> + if (err)
> + return err;
> + }
> +
> if (bpf_is_prune_point(env, env->insn_idx)) {
since you're going to respin consider the following feedback:
The special case for speculative paths is still here.
in_pad is compared in func_states_equal() now, so there is no need
to check before pruning.
Call bpf_exc_check_insn() from do_check_insn() ?
error_recoverable_with_nospec() after it does the same thing,
and the error will be printed after the insn instead of before it.
next prev parent reply other threads:[~2026-10-10 15:08 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-09 4:14 [PATCH bpf-next v10 00/24] bpf: Run exception cleanup landing pads when bpf_unwind() unwinds Yonghong Song
2026-10-09 4:14 ` [PATCH bpf-next v10 01/24] bpf: Pack bpf_insn_aux_data flags into bit fields Yonghong Song
2026-10-09 4:14 ` [PATCH bpf-next v10 02/24] bpf: Accept the compiler's exception cleanup table at program load Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 03/24] bpf: Add the bpf_unwind() and bpf_unwind_resume() kfuncs Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 04/24] bpf: Keep a call site's landing pad in insn_aux_data, add lookups Yonghong Song
2026-10-09 4:28 ` sashiko-bot
2026-10-09 15:10 ` Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 05/24] bpf: Mark covered call sites and check a program can take a table Yonghong Song
2026-10-09 4:34 ` sashiko-bot
2026-10-09 15:13 ` Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 06/24] bpf: Make exception landing pads reachable in the CFG Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 07/24] bpf: Verify an unwind through landing pads and epilogues Yonghong Song
2026-10-09 4:40 ` sashiko-bot
2026-10-09 15:24 ` Yonghong Song
2026-10-09 5:13 ` bot+bpf-ci
2026-10-09 15:25 ` Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 08/24] bpf: Refuse a callback that can unwind Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 09/24] bpf: Refuse a landing pad that does not resume Yonghong Song
2026-10-10 15:08 ` Alexei Starovoitov [this message]
2026-10-11 18:26 ` Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 10/24] bpf: Do not use a private stack for a program that can unwind Yonghong Song
2026-10-09 4:45 ` sashiko-bot
2026-10-09 15:38 ` Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 11/24] bpf: Prepare JITed programs for dispatching cleanup pads Yonghong Song
2026-10-09 4:35 ` sashiko-bot
2026-10-09 16:12 ` Yonghong Song
2026-10-09 5:13 ` bot+bpf-ci
2026-10-09 16:39 ` Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 12/24] bpf: Dispatch cleanup pads by rewriting return addresses Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 13/24] bpf: Refuse a trampoline that calls a subprog that can unwind Yonghong Song
2026-10-09 4:15 ` [PATCH bpf-next v10 14/24] bpf, x86: Dispatch exception cleanup pads at run time Yonghong Song
2026-10-09 4:32 ` sashiko-bot
2026-10-09 16:51 ` Yonghong Song
2026-10-09 4:16 ` [PATCH bpf-next v10 15/24] bpf, arm64: " Yonghong Song
2026-10-09 4:30 ` sashiko-bot
2026-10-09 16:55 ` Yonghong Song
2026-10-09 4:16 ` [PATCH bpf-next v10 16/24] libbpf: Resolve the compiler's _Unwind_Resume to the kernel's kfunc Yonghong Song
2026-10-09 4:16 ` [PATCH bpf-next v10 17/24] libbpf: Add cleanup_info to bpf_prog_load_opts Yonghong Song
2026-10-09 4:26 ` sashiko-bot
2026-10-09 4:16 ` [PATCH bpf-next v10 18/24] libbpf: Collect .bpf_cleanup records and pass them to the kernel Yonghong Song
2026-10-09 4:16 ` [PATCH bpf-next v10 19/24] libbpf: Carry the exception cleanup table through the light skeleton Yonghong Song
2026-10-09 4:16 ` [PATCH bpf-next v10 20/24] libbpf: Let the static linker carry .bpf_cleanup relocations Yonghong Song
2026-10-09 4:16 ` [PATCH bpf-next v10 21/24] selftests/bpf: Add end-to-end and negative .bpf_cleanup exception tests Yonghong Song
2026-10-09 4:16 ` [PATCH bpf-next v10 22/24] selftests/bpf: Add __set_global() and __ret_global() test tags Yonghong Song
2026-10-09 4:16 ` [PATCH bpf-next v10 23/24] selftests/bpf: Cover more accepted .bpf_cleanup exception shapes Yonghong Song
2026-10-09 4:16 ` [PATCH bpf-next v10 24/24] selftests/bpf: Load an exception cleanup program from a light skeleton Yonghong Song
2026-10-10 15:15 ` [PATCH bpf-next v10 00/24] bpf: Run exception cleanup landing pads when bpf_unwind() unwinds Alexei Starovoitov
2026-10-11 17:30 ` Yonghong Song
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