linux-kernel - [PATCH] seccomp: Stub for !HAVE_ARCH_SECCOMP

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Message-Id: <20241008-seccomp-compile-error-v1-1-f87de4007095@linaro.org>
Date: Tue, 08 Oct 2024 10:29:43 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Kees Cook <kees@...nel.org>, Andy Lutomirski <luto@...capital.net>, 
 Will Drewry <wad@...omium.org>
Cc: linux-kernel@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] seccomp: Stub for !HAVE_ARCH_SECCOMP_FILTER

If we have CONFIG_SECCOMP but not CONFIG_HAVE_ARCH_SECCOMP_FILTER
we get a compilation error:

../kernel/entry/common.c: In function 'syscall_trace_enter':
../kernel/entry/common.c:55:23: error: implicit declaration of function '__secure_computing' [-Werror=implicit-function-declaration]
   55 |                 ret = __secure_computing(NULL);
      |                       ^~~~~~~~~~~~~~~~~~

This is because generic entry calls __secure_computing()
unconditionally.

Provide the needed stub.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 include/linux/seccomp.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
index 709ad84809e1..832c612c5b54 100644
--- a/include/linux/seccomp.h
+++ b/include/linux/seccomp.h
@@ -31,6 +31,7 @@ static inline int secure_computing(void)
 	return 0;
 }
 #else
+static inline int __secure_computing(const struct seccomp_data *sd) { return 0; }
 extern void secure_computing_strict(int this_syscall);
 #endif
 

---
base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc
change-id: 20241008-seccomp-compile-error-83f367447d56

Best regards,
-- 
Linus Walleij <linus.walleij@...aro.org>