[PATCH 3/9] exec_path 3/9: switch TOMOYO to ->exec_path

[Alexey Dobriyan <adobriyan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Signed-off-by: Alexey Dobriyan <adobriyan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 security/tomoyo/common.c |   18 ++++++------------
 1 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index ddfb9cc..d26deea 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/uaccess.h>
+#include <linux/path.h>
 #include <linux/security.h>
 #include <linux/hardirq.h>
 #include "realpath.h"
@@ -700,20 +701,13 @@ bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
  */
 static const char *tomoyo_get_exe(void)
 {
-	struct mm_struct *mm = current->mm;
-	struct vm_area_struct *vma;
+	struct path exec_path;
 	const char *cp = NULL;
 
-	if (!mm)
-		return NULL;
-	down_read(&mm->mmap_sem);
-	for (vma = mm->mmap; vma; vma = vma->vm_next) {
-		if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
-			cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
-			break;
-		}
-	}
-	up_read(&mm->mmap_sem);
+	get_task_exec_path(current, &exec_path);
+	if (exec_path.mnt && exec_path.dentry)
+		cp = tomoyo_realpath_from_path(&exec_path);
+	path_put(&exec_path);
 	return cp;
 }