audit: x86: drop arch from __audit_syscall_entry() interface

Since the arch is found locally in __audit_syscall_entry(), there is no need to
pass it in as a parameter.  Delete it from the parameter list.

x86* was the only arch to call __audit_syscall_entry() directly and did so from
assembly code.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-audit@redhat.com
Signed-off-by: Eric Paris <eparis@redhat.com>

---

As this patch relies on changes in the audit tree, I think it
appropriate to send it through my tree rather than the x86 tree.

5 files changed, 20 insertions, 25 deletions

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 4299eb05023c..f5bdd2881815 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -186,12 +186,12 @@ sysexit_from_sys_call:
 
 #ifdef CONFIG_AUDITSYSCALL
         .macro auditsys_entry_common
-        movl %esi,%r9d                  /* 6th arg: 4th syscall arg */
-        movl %edx,%r8d                  /* 5th arg: 3rd syscall arg */
-        /* (already in %ecx)               4th arg: 2nd syscall arg */
-        movl %ebx,%edx                  /* 3rd arg: 1st syscall arg */
-        movl %eax,%esi                  /* 2nd arg: syscall number */
-        movl $AUDIT_ARCH_I386,%edi      /* 1st arg: audit arch */
+        movl %esi,%r8d                  /* 5th arg: 4th syscall arg */
+        movl %ecx,%r9d                  /*swap with edx*/
+        movl %edx,%ecx                  /* 4th arg: 3rd syscall arg */
+        movl %r9d,%edx                  /* 3rd arg: 2nd syscall arg */
+        movl %ebx,%esi                  /* 2nd arg: 1st syscall arg */
+        movl %eax,%edi                  /* 1st arg: syscall number */
         call __audit_syscall_entry
         movl RAX-ARGOFFSET(%rsp),%eax   /* reload syscall number */
         cmpq $(IA32_NR_syscalls-1),%rax
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 0d0c9d4ab6d5..f9e3fabc8716 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -449,12 +449,11 @@ sysenter_audit:
         jnz syscall_trace_entry
         addl $4,%esp
         CFI_ADJUST_CFA_OFFSET -4
-        /* %esi already in 8(%esp)         6th arg: 4th syscall arg */
-        /* %edx already in 4(%esp)         5th arg: 3rd syscall arg */
-        /* %ecx already in 0(%esp)         4th arg: 2nd syscall arg */
-        movl %ebx,%ecx                  /* 3rd arg: 1st syscall arg */
-        movl %eax,%edx                  /* 2nd arg: syscall number */
-        movl $AUDIT_ARCH_I386,%eax      /* 1st arg: audit arch */
+        movl %esi,4(%esp)               /* 5th arg: 4th syscall arg */
+        movl %edx,(%esp)                /* 4th arg: 3rd syscall arg */
+        /* %ecx already in %ecx            3rd arg: 2nd syscall arg */
+        movl %ebx,%edx                  /* 2nd arg: 1st syscall arg */
+        /* %eax already in %eax            1st arg: syscall number */
         call __audit_syscall_entry
         pushl_cfi %ebx
         movl PT_EAX(%esp),%eax          /* reload syscall number */
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index c844f0816ab8..5e8cb2ad9fb3 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -488,12 +488,11 @@ badsys:
          * jump back to the normal fast path.
          */
 auditsys:
-        movq %r10,%r9                   /* 6th arg: 4th syscall arg */
-        movq %rdx,%r8                   /* 5th arg: 3rd syscall arg */
-        movq %rsi,%rcx                  /* 4th arg: 2nd syscall arg */
-        movq %rdi,%rdx                  /* 3rd arg: 1st syscall arg */
-        movq %rax,%rsi                  /* 2nd arg: syscall number */
-        movl $AUDIT_ARCH_X86_64,%edi    /* 1st arg: audit arch */
+        movq %r10,%r8                   /* 5th arg: 4th syscall arg */
+        movq %rdx,%rcx                  /* 4th arg: 3rd syscall arg */
+        movq %rsi,%rdx                  /* 3rd arg: 2nd syscall arg */
+        movq %rdi,%rsi                  /* 2nd arg: 1st syscall arg */
+        movq %rax,%rdi                  /* 1st arg: syscall number */
         call __audit_syscall_entry
         LOAD_ARGS 0             /* reload call-clobbered registers */
         jmp system_call_fastpath
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 783157b289e8..1ae00891aff9 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -115,8 +115,7 @@ extern void audit_log_session_info(struct audit_buffer *ab);
                                 /* Public API */
 extern int  audit_alloc(struct task_struct *task);
 extern void __audit_free(struct task_struct *task);
-extern void __audit_syscall_entry(int arch,
-                                  int major, unsigned long a0, unsigned long a1,
+extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
                                   unsigned long a2, unsigned long a3);
 extern void __audit_syscall_exit(int ret_success, long ret_value);
 extern struct filename *__audit_reusename(const __user char *uptr);
@@ -148,7 +147,7 @@ static inline void audit_syscall_entry(int major, unsigned long a0,
                                        unsigned long a3)
 {
         if (unlikely(current->audit_context))
-                __audit_syscall_entry(syscall_get_arch(), major, a0, a1, a2, a3);
+                __audit_syscall_entry(major, a0, a1, a2, a3);
 }
 static inline void audit_syscall_exit(void *pt_regs)
 {
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 9f03ac205e1f..4e17443fd1ef 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1506,7 +1506,6 @@ void __audit_free(struct task_struct *tsk)
 
 /**
  * audit_syscall_entry - fill in an audit record at syscall entry
- * @arch: architecture type
  * @major: major syscall type (function)
  * @a1: additional syscall register 1
  * @a2: additional syscall register 2
@@ -1521,9 +1520,8 @@ void __audit_free(struct task_struct *tsk)
  * will only be written if another part of the kernel requests that it
  * be written).
  */
-void __audit_syscall_entry(int arch, int major,
-                         unsigned long a1, unsigned long a2,
-                         unsigned long a3, unsigned long a4)
+void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
+                           unsigned long a3, unsigned long a4)
 {
         struct task_struct *tsk = current;
         struct audit_context *context = tsk->audit_context;