Re: [RFC][PATCH] procfs: Add /proc/<pid>/mapped_files

[Cyrill Gorcunov]

On Wed, Jan 14, 2015 at 05:25:01PM +0200, Kirill A. Shutemov wrote:
...
> > 
> > This gives lsof and suchlike a way to determine the pathnames of files
> > mapped into a process without incurring the O(N^2) behavior of the
> > maps file.
> 
> We already have /proc/PID/map_files/ directory which lists all mapped
> files. Should we consider relaxing permission checking there and move it
> outside CONFIG_CHECKPOINT_RESTORE instead?
> 
> Restriction to CAP_SYSADMIN for follow_link is undertansble, but why do we
> restrict readdir and readlink?

We didn't think this functionality might be needed someone but us (criu camp),
so that the rule of thumb was CONFIG_CHECKPOINT_RESTORE + CAP_SYSADMIN, until
otherwise strictly needed. So I think now we can relax security rules a bit
and allow to readdir and such for owners.

	Cyrill
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/