linux-kernel - [PATCH v2] selftests/seccomp: fix pointer type mismatch in UPROBE test

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Message-ID: <20251026091232.166638-2-nirbhay.lkd@gmail.com>
Date: Sun, 26 Oct 2025 14:42:33 +0530
From: Nirbhay Sharma <nirbhay.lkd@...il.com>
To: Kees Cook <kees@...nel.org>,
	Shuah Khan <shuah@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org,
	llvm@...ts.linux.dev,
	khalid@...nel.org,
	david.hunter.linux@...il.com,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	Jiri Olsa <olsajiri@...il.com>,
	sam@...too.org,
	Nirbhay Sharma <nirbhay.lkd@...il.com>
Subject: [PATCH v2] selftests/seccomp: fix pointer type mismatch in UPROBE test

Fix compilation error in UPROBE_setup caused by pointer type mismatch
in the ternary expression when compiled with -fcf-protection. The
probed_uprobe function pointer has the __attribute__((nocf_check))
attribute, which causes the conditional operator to fail when combined
with the regular probed_uretprobe function pointer:

  seccomp_bpf.c:5175:74: error: pointer type mismatch in conditional
  expression [-Wincompatible-pointer-types]

Cast both function pointers to 'const void *' to match the expected
parameter type of get_uprobe_offset(), resolving the type mismatch
while preserving the function selection logic.

This error appears with compilers that enable Control Flow Integrity
(CFI) protection via -fcf-protection, such as Clang 19.1.2 (default
on Fedora).

Signed-off-by: Nirbhay Sharma <nirbhay.lkd@...il.com>
---
 tools/testing/selftests/seccomp/seccomp_bpf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index 874f17763536..e13ffe18ef95 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -5172,7 +5172,8 @@ FIXTURE_SETUP(UPROBE)
 		ASSERT_GE(bit, 0);
 	}
 
-	offset = get_uprobe_offset(variant->uretprobe ? probed_uretprobe : probed_uprobe);
+	offset = get_uprobe_offset(variant->uretprobe ?
+		(const void *)probed_uretprobe : (const void *)probed_uprobe);
 	ASSERT_GE(offset, 0);
 
 	if (variant->uretprobe)
-- 
2.48.1