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Re: coreutils-5.92 - tests/cp/fail-perm fails when run as root

From: Paul Eggert
Subject: Re: coreutils-5.92 - tests/cp/fail-perm fails when run as root
Date: Sun, 30 Oct 2005 01:17:52 -0700
User-agent: Gnus/5.1007 (Gnus v5.10.7) Emacs/21.4 (gnu/linux)

"Theodoros V. Kalamatianos" <address@hidden> writes:

> I have built coreutils-5.92 on my system (Linux-,
> glibc-2.3.3CVS) and was testing the build when I came up with a failed
> test for tests/cp/fail-perm. The testsuite is run as root.
> ...
> open("D/a", O_WRONLY|O_NONBLOCK|O_CREAT|O_NOCTTY, 0666) = 0
> utimes("/proc/self/fd/0", NULL)         = -1 EACCES (Permission denied)

You're saying that you're running as root?  So, on your host root
doesn't have the ability to set the time on "/proc/self/fd/0"?  That
sounds a bit strange.  Root should be able to do anything, right?

Can you reproduce this problem with a small C program?  Something like
this.  Please run it as root, in the same directory, etc.  You can use
strace to verify that it has the same system calls.

#include <fcntl.h>
#include <stdio.h>
#include <sys/time.h>
#include <unistd.h>

main (void)
  close (0);
  if (open ("D/a", O_WRONLY|O_NONBLOCK|O_CREAT|O_NOCTTY, 0666) != 0)
    perror ("open");
  else if (utimes ("/proc/self/fd/0", 0) != 0)
    perror ("utimes");
  return 0;

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