linux-kernel - [PATCH v10 04/11] arch/x86: add syscall_get

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Date:	Tue, 21 Feb 2012 11:30:28 -0600
From:	Will Drewry <wad@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
	kernel-hardening@...ts.openwall.com, netdev@...r.kernel.org,
	x86@...nel.org, arnd@...db.de, davem@...emloft.net, hpa@...or.com,
	mingo@...hat.com, oleg@...hat.com, peterz@...radead.org,
	rdunlap@...otime.net, mcgrathr@...omium.org, tglx@...utronix.de,
	luto@....edu, eparis@...hat.com, serge.hallyn@...onical.com,
	djm@...drot.org, scarybeasts@...il.com, indan@....nu,
	pmoore@...hat.com, akpm@...ux-foundation.org, corbet@....net,
	eric.dumazet@...il.com, markus@...omium.org, keescook@...omium.org,
	Will Drewry <wad@...omium.org>
Subject: [PATCH v10 04/11] arch/x86: add syscall_get_arch to syscall.h

Add syscall_get_arch() to export the current AUDIT_ARCH_* based on system call
entry path.

Signed-off-by: Will Drewry <wad@...omium.org>
---
 arch/x86/include/asm/syscall.h |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/syscall.h b/arch/x86/include/asm/syscall.h
index d962e56..1d713e4 100644
--- a/arch/x86/include/asm/syscall.h
+++ b/arch/x86/include/asm/syscall.h
@@ -13,6 +13,7 @@
 #ifndef _ASM_X86_SYSCALL_H
 #define _ASM_X86_SYSCALL_H
 
+#include <linux/audit.h>
 #include <linux/sched.h>
 #include <linux/err.h>
 #include <asm/asm-offsets.h>	/* For NR_syscalls */
@@ -87,6 +88,12 @@ static inline void syscall_set_arguments(struct task_struct *task,
 	memcpy(&regs->bx + i, args, n * sizeof(args[0]));
 }
 
+static inline int syscall_get_arch(struct task_struct *task,
+				   struct pt_regs *regs)
+{
+	return AUDIT_ARCH_I386;
+}
+
 #else	 /* CONFIG_X86_64 */
 
 static inline void syscall_get_arguments(struct task_struct *task,
@@ -211,6 +218,22 @@ static inline void syscall_set_arguments(struct task_struct *task,
 		}
 }
 
+static inline int syscall_get_arch(struct task_struct *task,
+				   struct pt_regs *regs)
+{
+#ifdef CONFIG_IA32_EMULATION
+	/*
+	 * TS_COMPAT is set for 32-bit syscall entries and then
+	 * remains set until we return to user mode.
+	 *
+	 * TIF_IA32 tasks should always have TS_COMPAT set at
+	 * system call time.
+	 */
+	if (task_thread_info(task)->status & TS_COMPAT)
+		return AUDIT_ARCH_I386;
+#endif
+	return AUDIT_ARCH_X86_64;
+}
 #endif	/* CONFIG_X86_32 */
 
 #endif	/* _ASM_X86_SYSCALL_H */
-- 
1.7.5.4

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