Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6

[platform/adaptation/renesas_rcar/renesas_kernel.git] / kernel / sysctl.c

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 0f1bd83..c0bb324 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -117,6 +117,7 @@ static int neg_one = -1;
 static int zero;
 static int __maybe_unused one = 1;
 static int __maybe_unused two = 2;
+static int __maybe_unused three = 3;
 static unsigned long one_ul = 1;
 static int one_hundred = 100;
 #ifdef CONFIG_PRINTK
@@ -169,6 +170,11 @@ static int proc_taint(struct ctl_table *table, int write,
                               void __user *buffer, size_t *lenp, loff_t *ppos);
 #endif
 
+#ifdef CONFIG_PRINTK
+static int proc_dmesg_restrict(struct ctl_table *table, int write,
+                               void __user *buffer, size_t *lenp, loff_t *ppos);
+#endif
+
 #ifdef CONFIG_MAGIC_SYSRQ
 /* Note: sysrq code uses it's own private copy */
 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
@@ -194,9 +200,9 @@ static int sysrq_sysctl_handler(ctl_table *table, int write,
 static struct ctl_table root_table[];
 static struct ctl_table_root sysctl_table_root;
 static struct ctl_table_header root_table_header = {
-       .count = 1,
+       {{.count = 1,
        .ctl_table = root_table,
-       .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
+       .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}},
        .root = &sysctl_table_root,
        .set = &sysctl_table_root.default_set,
 };
@@ -361,20 +367,13 @@ static struct ctl_table kern_table[] = {
                .mode           = 0644,
                .proc_handler   = sched_rt_handler,
        },
-       {
-               .procname       = "sched_compat_yield",
-               .data           = &sysctl_sched_compat_yield,
-               .maxlen         = sizeof(unsigned int),
-               .mode           = 0644,
-               .proc_handler   = proc_dointvec,
-       },
 #ifdef CONFIG_SCHED_AUTOGROUP
        {
                .procname       = "sched_autogroup_enabled",
                .data           = &sysctl_sched_autogroup_enabled,
                .maxlen         = sizeof(unsigned int),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_dointvec_minmax,
                .extra1         = &zero,
                .extra2         = &one,
        },
@@ -713,7 +712,7 @@ static struct ctl_table kern_table[] = {
                .data           = &kptr_restrict,
                .maxlen         = sizeof(int),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec_minmax,
+               .proc_handler   = proc_dmesg_restrict,
                .extra1         = &zero,
                .extra2         = &two,
        },
@@ -948,7 +947,7 @@ static struct ctl_table kern_table[] = {
                .data           = &sysctl_perf_event_sample_rate,
                .maxlen         = sizeof(sysctl_perf_event_sample_rate),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = perf_proc_update_handler,
        },
 #endif
 #ifdef CONFIG_KMEMCHECK
@@ -978,14 +977,18 @@ static struct ctl_table vm_table[] = {
                .data           = &sysctl_overcommit_memory,
                .maxlen         = sizeof(sysctl_overcommit_memory),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
+               .extra2         = &two,
        },
        {
                .procname       = "panic_on_oom",
                .data           = &sysctl_panic_on_oom,
                .maxlen         = sizeof(sysctl_panic_on_oom),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
+               .extra2         = &two,
        },
        {
                .procname       = "oom_kill_allocating_task",
@@ -1013,7 +1016,8 @@ static struct ctl_table vm_table[] = {
                .data           = &page_cluster,
                .maxlen         = sizeof(int),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
        },
        {
                .procname       = "dirty_background_ratio",
@@ -1061,7 +1065,8 @@ static struct ctl_table vm_table[] = {
                .data           = &dirty_expire_interval,
                .maxlen         = sizeof(dirty_expire_interval),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
        },
        {
                .procname       = "nr_pdflush_threads",
@@ -1137,6 +1142,8 @@ static struct ctl_table vm_table[] = {
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = drop_caches_sysctl_handler,
+               .extra1         = &one,
+               .extra2         = &three,
        },
 #ifdef CONFIG_COMPACTION
        {
@@ -1567,11 +1574,16 @@ void sysctl_head_get(struct ctl_table_header *head)
        spin_unlock(&sysctl_lock);
 }
 
+static void free_head(struct rcu_head *rcu)
+{
+       kfree(container_of(rcu, struct ctl_table_header, rcu));
+}
+
 void sysctl_head_put(struct ctl_table_header *head)
 {
        spin_lock(&sysctl_lock);
        if (!--head->count)
-               kfree(head);
+               call_rcu(&head->rcu, free_head);
        spin_unlock(&sysctl_lock);
 }
 
@@ -1685,13 +1697,8 @@ static int test_perm(int mode, int op)
 
 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
 {
-       int error;
        int mode;
 
-       error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
-       if (error)
-               return error;
-
        if (root->permissions)
                mode = root->permissions(root, current->nsproxy, table);
        else
@@ -1948,10 +1955,10 @@ void unregister_sysctl_table(struct ctl_table_header * header)
        start_unregistering(header);
        if (!--header->parent->count) {
                WARN_ON(1);
-               kfree(header->parent);
+               call_rcu(&header->parent->rcu, free_head);
        }
        if (!--header->count)
-               kfree(header);
+               call_rcu(&header->rcu, free_head);
        spin_unlock(&sysctl_lock);
 }
 
@@ -2392,6 +2399,17 @@ static int proc_taint(struct ctl_table *table, int write,
        return err;
 }
 
+#ifdef CONFIG_PRINTK
+static int proc_dmesg_restrict(struct ctl_table *table, int write,
+                               void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       if (write && !capable(CAP_SYS_ADMIN))
+               return -EPERM;
+
+       return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+}
+#endif
+
 struct do_proc_dointvec_minmax_conv_param {
        int *min;
        int *max;