[Bug 11431] New: cp ignores read-only permission on existing destination file overwrite conditions

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=11431

            Bug ID: 11431
           Summary: cp ignores read-only permission on existing
                    destination file overwrite conditions
           Product: Busybox
           Version: 1.28.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: Standard Compliance
          Assignee: unassigned at busybox.net
          Reporter: dankirkd at comcast.net
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

The following demonstrates the expected behavior of "cp" when we try to copy a
file over an existing read-only file:

$ mkdir aaa
$ cd aaa
$ touch a.txt
$ touch b.txt
$ ls -laF
total 0
drwxr-xr-x   4 user1  group1  136 Oct 24 12:25 ./
drwxr-xr-x  13 user1  group1  442 Oct 24 12:24 ../
-rw-r--r--   1 user1  group1    2 Oct 24 12:25 a.txt
-rw-r--r--   1 user1  group1    1 Oct 24 12:25 b.txt
$ chmod 440 *.txt
$ ls -laF
total 0
drwxr-xr-x   4 user1  group1  136 Oct 24 12:25 ./
drwxr-xr-x  13 user1  group1  442 Oct 24 12:24 ../
-r--r-----   1 user1  group1    2 Oct 24 12:25 a.txt
-r--r-----   1 user1  group1    1 Oct 24 12:25 b.txt
$ cp a.txt b.txt
cp: b.txt: Permission denied

However, when using Busybox "cp" (on Alpine 3.8), the operation succeeds
without permission issues.

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