1 files changed, 44 insertions, 18 deletions

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index e5102ea6e1..62d4d95668 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -25,12 +25,14 @@
 #include <linux/slab.h>
 #include <linux/sysctl.h>
 #include <linux/proc_fs.h>
+#include <linux/capability.h>
 #include <linux/ctype.h>
 #include <linux/utsname.h>
 #include <linux/capability.h>
 #include <linux/smp_lock.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/kobject.h>
 #include <linux/net.h>
 #include <linux/sysrq.h>
 #include <linux/highuid.h>
@@ -67,6 +69,8 @@ extern int min_free_kbytes;
 extern int printk_ratelimit_jiffies;
 extern int printk_ratelimit_burst;
 extern int pid_max_min, pid_max_max;
+extern int sysctl_drop_caches;
+extern int percpu_pagelist_fraction;
 
 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 int unknown_nmi_panic;
@@ -77,15 +81,13 @@ extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 static int maxolduid = 65535;
 static int minolduid;
+static int min_percpu_pagelist_fract = 8;
 
 static int ngroups_max = NGROUPS_MAX;
 
 #ifdef CONFIG_KMOD
 extern char modprobe_path[];
 #endif
-#ifdef CONFIG_HOTPLUG
-extern char hotplug_path[];
-#endif
 #ifdef CONFIG_CHR_DEV_SG
 extern int sg_big_buff;
 #endif
@@ -110,7 +112,7 @@ extern int pwrsw_enabled;
 extern int unaligned_enabled;
 #endif
 
-#ifdef CONFIG_ARCH_S390
+#ifdef CONFIG_S390
 #ifdef CONFIG_MATHEMU
 extern int sysctl_ieee_emulation_warnings;
 #endif
@@ -397,8 +399,8 @@ static ctl_table kern_table[] = {
         {
                 .ctl_name       = KERN_HOTPLUG,
                 .procname       = "hotplug",
-                .data           = &hotplug_path,
-                .maxlen         = HOTPLUG_PATH_LEN,
+                .data           = &uevent_helper,
+                .maxlen         = UEVENT_HELPER_PATH_LEN,
                 .mode           = 0644,
                 .proc_handler   = &proc_dostring,
                 .strategy       = &sysctl_string,
@@ -544,7 +546,7 @@ static ctl_table kern_table[] = {
                 .extra1         = &minolduid,
                 .extra2         = &maxolduid,
         },
-#ifdef CONFIG_ARCH_S390
+#ifdef CONFIG_S390
 #ifdef CONFIG_MATHEMU
         {
                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
@@ -646,7 +648,7 @@ static ctl_table kern_table[] = {
                 .mode           = 0644,
                 .proc_handler   = &proc_dointvec,
         },
-#if defined(CONFIG_ARCH_S390)
+#if defined(CONFIG_S390)
         {
                 .ctl_name       = KERN_SPIN_RETRY,
                 .procname       = "spin_retry",
@@ -777,6 +779,15 @@ static ctl_table vm_table[] = {
                 .strategy       = &sysctl_intvec,
         },
         {
+                .ctl_name       = VM_DROP_PAGECACHE,
+                .procname       = "drop_caches",
+                .data           = &sysctl_drop_caches,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = drop_caches_sysctl_handler,
+                .strategy       = &sysctl_intvec,
+        },
+        {
                 .ctl_name       = VM_MIN_FREE_KBYTES,
                 .procname       = "min_free_kbytes",
                 .data           = &min_free_kbytes,
@@ -786,6 +797,16 @@ static ctl_table vm_table[] = {
                 .strategy       = &sysctl_intvec,
                 .extra1         = &zero,
         },
+        {
+                .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
+                .procname       = "percpu_pagelist_fraction",
+                .data           = &percpu_pagelist_fraction,
+                .maxlen         = sizeof(percpu_pagelist_fraction),
+                .mode           = 0644,
+                .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
+                .strategy       = &sysctl_intvec,
+                .extra1         = &min_percpu_pagelist_fract,
+        },
 #ifdef CONFIG_MMU
         {
                 .ctl_name       = VM_MAX_MAP_COUNT,
@@ -2192,27 +2213,32 @@ int sysctl_string(ctl_table *table, int __user *name, int nlen,
                   void __user *oldval, size_t __user *oldlenp,
                   void __user *newval, size_t newlen, void **context)
 {
-        size_t l, len;
-        
         if (!table->data || !table->maxlen) 
                 return -ENOTDIR;
         
         if (oldval && oldlenp) {
-                if (get_user(len, oldlenp))
+                size_t bufsize;
+                if (get_user(bufsize, oldlenp))
                         return -EFAULT;
-                if (len) {
-                        l = strlen(table->data)+1;
-                        if (len > l) len = l;
-                        if (len >= table->maxlen)
+                if (bufsize) {
+                        size_t len = strlen(table->data), copied;
+
+                        /* This shouldn't trigger for a well-formed sysctl */
+                        if (len > table->maxlen)
                                 len = table->maxlen;
-                        if(copy_to_user(oldval, table->data, len))
+
+                        /* Copy up to a max of bufsize-1 bytes of the string */
+                        copied = (len >= bufsize) ? bufsize - 1 : len;
+
+                        if (copy_to_user(oldval, table->data, copied) ||
+                            put_user(0, (char __user *)(oldval + copied)))
                                 return -EFAULT;
-                        if(put_user(len, oldlenp))
+                        if (put_user(len, oldlenp))
                                 return -EFAULT;
                 }
         }
         if (newval && newlen) {
-                len = newlen;
+                size_t len = newlen;
                 if (len > table->maxlen)
                         len = table->maxlen;
                 if(copy_from_user(table->data, newval, len))