Merge tag 'denywrite-for-5.15' of git://github.com/davidhildenbrand/linux

[linux-2.6-microblaze.git] / kernel / sys.c

diff --git a/kernel/sys.c b/kernel/sys.c
index 72c7639..b6aa704 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1847,7 +1847,6 @@ SYSCALL_DEFINE1(umask, int, mask)
 static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
 {
        struct fd exe;
-       struct file *old_exe, *exe_file;
        struct inode *inode;
        int err;
 
@@ -1870,40 +1869,10 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
        if (err)
                goto exit;
 
-       /*
-        * Forbid mm->exe_file change if old file still mapped.
-        */
-       exe_file = get_mm_exe_file(mm);
-       err = -EBUSY;
-       if (exe_file) {
-               struct vm_area_struct *vma;
-
-               mmap_read_lock(mm);
-               for (vma = mm->mmap; vma; vma = vma->vm_next) {
-                       if (!vma->vm_file)
-                               continue;
-                       if (path_equal(&vma->vm_file->f_path,
-                                      &exe_file->f_path))
-                               goto exit_err;
-               }
-
-               mmap_read_unlock(mm);
-               fput(exe_file);
-       }
-
-       err = 0;
-       /* set the new file, lockless */
-       get_file(exe.file);
-       old_exe = xchg(&mm->exe_file, exe.file);
-       if (old_exe)
-               fput(old_exe);
+       err = replace_mm_exe_file(mm, exe.file);
 exit:
        fdput(exe);
        return err;
-exit_err:
-       mmap_read_unlock(mm);
-       fput(exe_file);
-       goto exit;
 }
 
 /*