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Subject[PATCH v10 04/11] arch/x86: add syscall_get_arch to syscall.h
Date
Add syscall_get_arch() to export the current AUDIT_ARCH_* based on system call
entry path.

Signed-off-by: Will Drewry <wad@chromium.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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