Binary package hint: binfmt-support
qemu-user-static ships a number of binfmt handlers under /usr/share/binfmts which are registered in the postinst using 'update-binfmts --import qemu-$target'. In natty, the resulting registrations under /var/lib/binfmts (and in /proc/sys/fs/binfmt_misc) don't respect the value of the flags: field set in the source file. As a result, foreign-arch suid binaries can't be run under qemu because the kernel has been told to use the suid bit from the non-setuid qemu interpreter, instead of the one from the target binary.
Please fix update-binfmts to respect the flags: field, which I think worked in previous versions.
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: binfmt-support 2.0.3
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
Architecture: amd64
Date: Tue May 31 16:21:10 2011
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
ProcEnviron:
LANGUAGE=en_US:en
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: binfmt-support
UpgradeStatus: Upgraded to natty on 2011-03-24 (68 days ago)
Are you sure this ever worked? I certainly never documented this syntax; the trailing colon is out of line with the rest of the syntax; and it partially duplicates the 'credentials' field added by Loïc to handle the 'C' flag.
I would recommend deleting the 'flags:' line and using the documented 'credentials yes' line instead. If you need the 'O' flag, I'd be happy to add support for 'open-binary yes'.