linux-kernel - [PATCH 1/4] arch/arm: add syscall_get

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Message-Id: <1351557682-20983-2-git-send-email-keescook@chromium.org>
Date:	Mon, 29 Oct 2012 17:41:19 -0700
From:	Kees Cook <keescook@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Will Drewry <wad@...omium.org>,
	Geremy Condra <gcondra@...gle.com>,
	Kees Cook <keescook@...omium.org>
Subject: [PATCH 1/4] arch/arm: add syscall_get_arch

From: Will Drewry <wad@...omium.org>

Provide an ARM implementation of syscall_get_arch. This is a pre-requisite
for CONFIG_HAVE_ARCH_SECCOMP_FILTER.

Signed-off-by: Will Drewry <wad@...omium.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 arch/arm/include/asm/syscall.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/include/asm/syscall.h b/arch/arm/include/asm/syscall.h
index 9fdded6..803f433 100644
--- a/arch/arm/include/asm/syscall.h
+++ b/arch/arm/include/asm/syscall.h
@@ -7,6 +7,8 @@
 #ifndef _ASM_ARM_SYSCALL_H
 #define _ASM_ARM_SYSCALL_H
 
+#include <linux/audit.h> /* for AUDIT_ARCH_* */
+#include <linux/elf.h> /* for ELF_EM */
 #include <linux/err.h>
 #include <linux/sched.h>
 
@@ -95,4 +97,15 @@ static inline void syscall_set_arguments(struct task_struct *task,
 	memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
 }
 
+static inline int syscall_get_arch(struct task_struct *task,
+				   struct pt_regs *regs)
+{
+	/* ARM tasks don't change audit architectures on the fly. */
+#ifdef __ARMEB__
+	return AUDIT_ARCH_ARMEB;
+#else
+	return AUDIT_ARCH_ARM;
+#endif
+}
+
 #endif /* _ASM_ARM_SYSCALL_H */
-- 
1.7.9.5

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