linux-kernel - [PATCH AUTOSEL 6.1 050/212] bpf: Return prog btf

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Message-Id: <20250505230624.2692522-50-sashal@kernel.org>
Date: Mon,  5 May 2025 19:03:42 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Mykyta Yatsenko <yatsenko@...a.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	Sasha Levin <sashal@...nel.org>,
	ast@...nel.org,
	daniel@...earbox.net,
	bpf@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 050/212] bpf: Return prog btf_id without capable check

From: Mykyta Yatsenko <yatsenko@...a.com>

[ Upstream commit 07651ccda9ff10a8ca427670cdd06ce2c8e4269c ]

Return prog's btf_id from bpf_prog_get_info_by_fd regardless of capable
check. This patch enables scenario, when freplace program, running
from user namespace, requires to query target prog's btf.

Signed-off-by: Mykyta Yatsenko <yatsenko@...a.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Acked-by: Yonghong Song <yonghong.song@...ux.dev>
Link: https://lore.kernel.org/bpf/20250317174039.161275-3-mykyta.yatsenko5@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/bpf/syscall.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 27fdf1b2fc469..b145f3ef3695e 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -4005,6 +4005,8 @@ static int bpf_prog_get_info_by_fd(struct file *file,
 	info.recursion_misses = stats.misses;
 
 	info.verified_insns = prog->aux->verified_insns;
+	if (prog->aux->btf)
+		info.btf_id = btf_obj_id(prog->aux->btf);
 
 	if (!bpf_capable()) {
 		info.jited_prog_len = 0;
@@ -4151,8 +4153,6 @@ static int bpf_prog_get_info_by_fd(struct file *file,
 		}
 	}
 
-	if (prog->aux->btf)
-		info.btf_id = btf_obj_id(prog->aux->btf);
 	info.attach_btf_id = prog->aux->attach_btf_id;
 	if (attach_btf)
 		info.attach_btf_obj_id = btf_obj_id(attach_btf);
-- 
2.39.5