Markus Schoder wrote:
> Package: coreutils
> Version: 5.97-5.4
> Severity: normal

I have recreated the problem and have reduced it to something related
to the use of openat() and fallback code in the 5.97-5.4 NMU whereas
the previous 5.97-5.3 used getcwd().  Methinks the NMU changed more
than intended.  Certainly more than was documented in the changelog.

> First some pre-conditions:
> 1. Current directory is /tmp
> 2. /tmp is bind mounted to /var/chroot/sid-ia32/tmp

The key info here is that openat() is now attempted and fails (for me
on my older amd64 kernel) and the fallback code requires /proc to be
available.  This was not required in the getcwd() version.

> 3. ia32 is a program that does a chroot to /var/chroot/sid-ia32 and then
> execs a shell.

Using 'sudo chroot /path/chroot /bin/bash' works fine too.

> Given those here is a command sequence that shows the problem:
> 
> /tmp$ ia32
> /tmp$ /bin/pwd
> /bin/pwd: couldn't find directory entry in `../..' with matching i-node

Confirmed.  pwd tries to open /proc/self/fd and various and fails
because it is not there.

Workaround: Also bind mount /proc into the chroot.

This is probably a leading indication that other commands in the
coreutils will have similar issues.

Bob



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