On 02/02/2015 10:31 PM, Alban Crequy wrote: > Hello, > > Thanks for updating the man page. > > On 12 December 2014 at 22:54, Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote: > (...) >> Furthermore to preserve in some form the useful applications that have >> been setting gid_map without privilege the file /proc/[pid]/setgroups >> was added to allow disabling setgroups. With the setgroups system >> call permanently disabled in a user namespace it again becomes safe to >> allow writes to gid_map without privilege. >> >> Here is my meager attempt to update user_namespaces.7 to reflect these >> issues. > > The program userns_child_exec.c in user_namespaces.7 should be updated > to write in /proc/.../setgroups, near the line: > /* Update the UID and GID maps in the child */ > > Otherwise, the example given in the manpage does not work: > $ ./userns_child_exec -p -m -U -M '0 1000 1' -G '0 1000 1' bash Thanks, Alban. I've added code to the example to handle /proc/PID/setgroups (and tested). Cheers, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
