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Subject[PATCH 1/1] added code to export CAP_LAST_CAP in /proc/sys/kernel modeled after ngroups_max
Date
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@mindstab.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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