Re: [PATCH] add /proc/*/pmap files

[Albert Cahalan <acahalan@gmail.com>]

On 1/22/06, Arjan van de Ven <arjan@infradead.org> wrote:
> On Sun, 2006-01-22 at 04:50 -0500, Albert Cahalan wrote:
> > This adds a few things needed by the pmap command.
> > They show up in /proc/*/pmap files.
>
>
> also since this shows filenames and such, could you make the permissions
> of the pmap file be 0400 ? (yes I know some others in the same dir
> aren't 0400 yet, but I hope that that can be changed in the future,
> adding more of these should be avoided for information-leak/exposure
> reasons)

I thought it was the addresses you'd object to.

I was thinking I'd follow up with a patch to make things
a bit more logical as far as info exposure goes. It makes
no sense to have the /proc/*/exe link fail a readlink()
when one can reliably guess that data from elsewhere.

I notice that Fedora Core 4 shipped with /proc/*/smaps
files that were readable, but /proc/*/maps files that were
not readable. (at least, a recent kernel update did)

As of now, I'm keeping mainstream kernel policy as is.