linux-kernel - [PATCH 1/1] added code to export CAP_LAST_CAP in /proc/sys/kernel modeled after ngroups

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Date:	Wed, 12 Oct 2011 15:56:34 -0700
From:	Dan Ballard <dan@...dstab.net>
To:	Dan Ballard <dan@...dstab.net>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lennart Poettering <lennart@...ttering.net>,
	Kay Sievers <kay.sievers@...y.org>
Cc:	linux-kernel@...r.kernel.org, Dan Ballard <dan@...dstab.net>
Subject: [PATCH 1/1] added code to export CAP_LAST_CAP in /proc/sys/kernel modeled after ngroups_max

In response to a request by the Linux Plumbers about getting CAP_LAST_CAP exposed somehow, I talked to Lennart Poettering briefly and went ahead and added cap_last_cap to /proc/sys/kernel in a similar fashion as ngroups_max is exported.  The patch is simple and just adds another struct to the array of exported values in sysctl.c.

Signed-off-by: Dan Ballard <dan@...dstab.net>
---
 kernel/sysctl.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 11d65b5..0cef3c2 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -57,6 +57,7 @@
 #include <linux/pipe_fs_i.h>
 #include <linux/oom.h>
 #include <linux/kmod.h>
+#include <linux/capability.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -134,6 +135,7 @@ static int minolduid;
 static int min_percpu_pagelist_fract = 8;
 
 static int ngroups_max = NGROUPS_MAX;
+static int cap_last_cap = CAP_LAST_CAP;
 
 #ifdef CONFIG_INOTIFY_USER
 #include <linux/inotify.h>
@@ -730,6 +732,13 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0444,
 		.proc_handler	= proc_dointvec,
 	},
+	{
+		.procname	= "cap_last_cap",
+		.data		= &cap_last_cap,
+		.maxlen		= sizeof(int),
+		.mode		= 0444,
+		.proc_handler	= proc_dointvec,
+	},
 #if defined(CONFIG_LOCKUP_DETECTOR)
 	{
 		.procname       = "watchdog",
-- 
1.7.4.1

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