linux-kernel - [PATCH 1/2] KEYS: Document making the keyring quotas controllable through /proc/sys

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Message-ID: <20080314115823.19124.76244.stgit@warthog.procyon.org.uk>
Date:	Fri, 14 Mar 2008 11:58:23 +0000
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...ux-foundation.org, kwc@...i.umich.edu
Cc:	arunsr@....iitk.ac.in, dwalsh@...hat.com,
	linux-security-module@...r.kernel.org, dhowells@...hat.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] KEYS: Document making the keyring quotas controllable
	through /proc/sys

Alter the key management documentation to include information on keyring quota
controls as added in a previous patch.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 Documentation/keys.txt |   24 +++++++++++++++++++++++-
 1 files changed, 23 insertions(+), 1 deletions(-)


diff --git a/Documentation/keys.txt b/Documentation/keys.txt
index be424b0..d5c7a57 100644
--- a/Documentation/keys.txt
+++ b/Documentation/keys.txt
@@ -170,7 +170,8 @@ The key service provides a number of features besides keys:
      amount of description and payload space that can be consumed.
 
      The user can view information on this and other statistics through procfs
-     files.
+     files.  The root user may also alter the quota limits through sysctl files
+     (see the section "New procfs files").
 
      Process-specific and thread-specific keyrings are not counted towards a
      user's quota.
@@ -329,6 +330,27 @@ about the status of the key service:
 	<bytes>/<max>		Key size quota
 
 
+Four new sysctl files have been added also for the purpose of controlling the
+quota limits on keys:
+
+ (*) /proc/sys/kernel/keys/root_maxkeys
+     /proc/sys/kernel/keys/root_maxbytes
+
+     These files hold the maximum number of keys that root may have and the
+     maximum total number of bytes of data that root may have stored in those
+     keys.
+
+ (*) /proc/sys/kernel/keys/maxkeys
+     /proc/sys/kernel/keys/maxbytes
+
+     These files hold the maximum number of keys that each non-root user may
+     have and the maximum total number of bytes of data that each of those
+     users may have stored in their keys.
+
+Root may alter these by writing each new limit as a decimal number string to
+the appropriate file.
+
+
 ===============================
 USERSPACE SYSTEM CALL INTERFACE
 ===============================

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