mm: use mm->exe_file instead of first VM_EXECUTABLE vma->vm_file

Some security modules and oprofile still uses VM_EXECUTABLE for retrieving
a task's executable file.  After this patch they will use mm->exe_file
directly.  mm->exe_file is protected with mm->mmap_sem, so locking stays
the same.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: Chris Metcalf <cmetcalf@tilera.com>			[arch/tile]
Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>	[tomoyo]
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Carsten Otte <cotte@de.ibm.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Eric Paris <eparis@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Venkatesh Pallipadi <venki@google.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 3 insertions, 13 deletions

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 29e090cc0e46..f4a7756f999c 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1151,7 +1151,6 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
         const struct cred *cred;
         char name[sizeof(tsk->comm)];
         struct mm_struct *mm = tsk->mm;
-        struct vm_area_struct *vma;
         char *tty;
 
         if (!ab)
@@ -1191,16 +1190,8 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
 
         if (mm) {
                 down_read(&mm->mmap_sem);
-                vma = mm->mmap;
-                while (vma) {
-                        if ((vma->vm_flags & VM_EXECUTABLE) &&
-                            vma->vm_file) {
-                                audit_log_d_path(ab, " exe=",
-                                                 &vma->vm_file->f_path);
-                                break;
-                        }
-                        vma = vma->vm_next;
-                }
+                if (mm->exe_file)
+                        audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
                 up_read(&mm->mmap_sem);
         }
         audit_log_task_context(ab);
diff --git a/kernel/fork.c b/kernel/fork.c
index a2b1efc20928..a57a993681ed 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -656,8 +656,7 @@ struct file *get_mm_exe_file(struct mm_struct *mm)
 {
         struct file *exe_file;
 
-        /* We need mmap_sem to protect against races with removal of
-         * VM_EXECUTABLE vmas */
+        /* We need mmap_sem to protect against races with removal of exe_file */
         down_read(&mm->mmap_sem);
         exe_file = mm->exe_file;
         if (exe_file)