linux-kernel - [PATCH RFC bpf-next v3 08/16] bpf/verifier: do_misc_fixups for is_bpf_timer_set_sleepable_cb

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Date: Wed, 21 Feb 2024 17:25:24 +0100
From: Benjamin Tissoires <bentiss@...nel.org>
To: Alexei Starovoitov <ast@...nel.org>, 
 Daniel Borkmann <daniel@...earbox.net>, 
 John Fastabend <john.fastabend@...il.com>, 
 Andrii Nakryiko <andrii@...nel.org>, 
 Martin KaFai Lau <martin.lau@...ux.dev>, 
 Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
 Yonghong Song <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>, 
 Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, 
 Jiri Olsa <jolsa@...nel.org>, Jiri Kosina <jikos@...nel.org>, 
 Benjamin Tissoires <benjamin.tissoires@...hat.com>, 
 Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-input@...r.kernel.org, linux-doc@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, Benjamin Tissoires <bentiss@...nel.org>
Subject: [PATCH RFC bpf-next v3 08/16] bpf/verifier: do_misc_fixups for
 is_bpf_timer_set_sleepable_cb_kfunc

This is still a WIP, but I think this can be dropped as we never
get to this instruction. So what should we do here?

Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>
---
 kernel/bpf/verifier.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 4766c43606c4..8a9f268c4ee2 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -19720,7 +19720,8 @@ static int do_misc_fixups(struct bpf_verifier_env *env)
 			continue;
 		}
 
-		if (insn->imm == BPF_FUNC_timer_set_callback) {
+		if (insn->imm == BPF_FUNC_timer_set_callback ||
+		    is_bpf_timer_set_sleepable_cb_kfunc(insn->imm)) {
 			/* The verifier will process callback_fn as many times as necessary
 			 * with different maps and the register states prepared by
 			 * set_timer_callback_state will be accurate.

-- 
2.43.0