linux-kernel - how to tell if arbitrary kernel memory address is backed by physical memory?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 16 Apr 2009 09:37:46 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>
Subject: how to tell if arbitrary kernel memory address is backed by physical
 memory?

Hi all,

Quick question to the memory management folks.

Is there a portable way to tell whether a particular virtual address in 
the lowmem address range is backed by physical memory and is readable?

For background...we have some guys working on a software memory scrubber 
for an embedded board.  The memory controller supports ECC but doesn't 
support scrubbing  in hardware.  What we want to do is walk all of 
lowmem, reading in memory.  If a fault is encountered, it will be 
handled by other code.

Thanks,

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