How To Enable Private Dirty RSS Reporting

willclark · 11-29-2009, 08:04 PM

I'm running Fedora Core 9 w/ a Kernel version of 2.6.29.5-grsec-hostnoc-4.2.0-x86_64-libata.

Does anyone know how to enable Private Dirty RSS Reporting?

syg00 · 11-29-2009, 08:36 PM

Have a look in the proc manpage for smaps - I'd be *most* surprised if this wasn't being exposed.

willclark · 11-29-2009, 09:58 PM

I admit to being in a little over my head in this category, so I may be asking some pretty basic questions here.

The man pages say that in order for the smaps file to be generated the CONFIG_MMU must be set.

When I check /proc/config.gz, it is set to y (CONFIG_MMU=y), but there are no smaps in any of the /proc/PID directories.

Am I missing something, or is there something else I need to do?

syg00 · 11-29-2009, 10:09 PM

That's /proc/[pid]/smaps - i.e. a process id, not the word "PID". For an example, try "less /proc/self/smaps" - that's a special case that will always resolve to yourself. Page up and down to have a look around , then "q" (no quotes) to quit.

willclark · 11-29-2009, 10:22 PM

Right, I understand that PID/[pid] == process ID.

When I run less /proc/self/smaps (as root), it outputs:

/proc/self/smaps: No such file or directory

syg00 · 11-29-2009, 10:41 PM

Ugh - like I said, paint me amazed. Might be because of the hardening, but I don't know why. Since smaps was merged (way back in in 2.6.14) I've never seen it not be present. But I don't run hardened either ...

willclark · 11-30-2009, 03:48 PM

Thanks for all the help!