linux-kernel - [PATCH v2 0/4] seccomp: remove the 'sd' argument from __secure

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Message-ID: <20250128150228.GA15298@redhat.com>
Date: Tue, 28 Jan 2025 16:02:28 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Kees Cook <kees@...nel.org>, Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org,
	linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 0/4] seccomp: remove the 'sd' argument from
 __secure_computing()

Hello,

Link to v1: https://lore.kernel.org/all/20250120134409.GA21241@redhat.com/
Only 2/4 was changed, please see interdiff at the end.

I've included the acks I got on 1/4, 3/4, and 4/4 (thanks!).

Oleg.
---

 arch/mips/kernel/ptrace.c           | 20 ++-----------------
 arch/powerpc/kernel/ptrace/ptrace.c |  2 +-
 include/linux/seccomp.h             | 12 ++++--------
 kernel/entry/common.c               |  2 +-
 kernel/seccomp.c                    | 39 ++++++++++++++++++-------------------
 5 files changed, 27 insertions(+), 48 deletions(-)

-------------------------------------------------------------------------------
diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
index 6125baa96b76..9b959972bf4a 100644
--- a/include/linux/seccomp.h
+++ b/include/linux/seccomp.h
@@ -22,8 +22,9 @@
 #include <linux/atomic.h>
 #include <asm/seccomp.h>
 
-#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
 extern int __secure_computing(void);
+
+#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
 static inline int secure_computing(void)
 {
 	if (unlikely(test_syscall_work(SECCOMP)))
@@ -32,7 +33,6 @@ static inline int secure_computing(void)
 }
 #else
 extern void secure_computing_strict(int this_syscall);
-static inline int __secure_computing(void) { return 0; }
 #endif
 
 extern long prctl_get_seccomp(void);
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index 75e293d3c1a1..4bd2eb50f77b 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -29,13 +29,11 @@
 #include <linux/syscalls.h>
 #include <linux/sysctl.h>
 
+#include <asm/syscall.h>
+
 /* Not exposed in headers: strictly internal use only. */
 #define SECCOMP_MODE_DEAD	(SECCOMP_MODE_FILTER + 1)
 
-#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
-#include <asm/syscall.h>
-#endif
-
 #ifdef CONFIG_SECCOMP_FILTER
 #include <linux/file.h>
 #include <linux/filter.h>
@@ -1062,6 +1060,13 @@ void secure_computing_strict(int this_syscall)
 	else
 		BUG();
 }
+int __secure_computing(void)
+{
+	int this_syscall = syscall_get_nr(current, current_pt_regs());
+
+	secure_computing_strict(this_syscall);
+	return 0;
+}
 #else
 
 #ifdef CONFIG_SECCOMP_FILTER