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authorEric W. Biederman <ebiederm@xmission.com>2012-01-06 04:07:15 -0800
committerEric W. Biederman <ebiederm@xmission.com>2012-01-24 16:37:54 -0800
commit1f87f0b52b1d6581168cb80f86746bc4df918d01 (patch)
tree73576c0872c61c526ade225d6441a6610beb666b /kernel/sysctl_check.c
parentde4e83bd6b5e16d491ec068cd22801d5d063b07a (diff)
downloadop-kernel-dev-1f87f0b52b1d6581168cb80f86746bc4df918d01.zip
op-kernel-dev-1f87f0b52b1d6581168cb80f86746bc4df918d01.tar.gz
sysctl: Move the implementation into fs/proc/proc_sysctl.c
Move the core sysctl code from kernel/sysctl.c and kernel/sysctl_check.c into fs/proc/proc_sysctl.c. Currently sysctl maintenance is hampered by the sysctl implementation being split across 3 files with artificial layering between them. Consolidate the entire sysctl implementation into 1 file so that it is easier to see what is going on and hopefully allowing for simpler maintenance. For functions that are now only used in fs/proc/proc_sysctl.c remove their declarations from sysctl.h and make them static in fs/proc/proc_sysctl.c Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'kernel/sysctl_check.c')
-rw-r--r--kernel/sysctl_check.c160
1 files changed, 0 insertions, 160 deletions
diff --git a/kernel/sysctl_check.c b/kernel/sysctl_check.c
deleted file mode 100644
index 362da65..0000000
--- a/kernel/sysctl_check.c
+++ /dev/null
@@ -1,160 +0,0 @@
-#include <linux/stat.h>
-#include <linux/sysctl.h>
-#include "../fs/xfs/xfs_sysctl.h"
-#include <linux/sunrpc/debug.h>
-#include <linux/string.h>
-#include <net/ip_vs.h>
-
-
-static int sysctl_depth(struct ctl_table *table)
-{
- struct ctl_table *tmp;
- int depth;
-
- depth = 0;
- for (tmp = table; tmp->parent; tmp = tmp->parent)
- depth++;
-
- return depth;
-}
-
-static struct ctl_table *sysctl_parent(struct ctl_table *table, int n)
-{
- int i;
-
- for (i = 0; table && i < n; i++)
- table = table->parent;
-
- return table;
-}
-
-
-static void sysctl_print_path(struct ctl_table *table)
-{
- struct ctl_table *tmp;
- int depth, i;
- depth = sysctl_depth(table);
- if (table->procname) {
- for (i = depth; i >= 0; i--) {
- tmp = sysctl_parent(table, i);
- printk("/%s", tmp->procname?tmp->procname:"");
- }
- }
- printk(" ");
-}
-
-static struct ctl_table *sysctl_check_lookup(struct nsproxy *namespaces,
- struct ctl_table *table)
-{
- struct ctl_table_header *head;
- struct ctl_table *ref, *test;
- int depth, cur_depth;
-
- depth = sysctl_depth(table);
-
- for (head = __sysctl_head_next(namespaces, NULL); head;
- head = __sysctl_head_next(namespaces, head)) {
- cur_depth = depth;
- ref = head->ctl_table;
-repeat:
- test = sysctl_parent(table, cur_depth);
- for (; ref->procname; ref++) {
- int match = 0;
- if (cur_depth && !ref->child)
- continue;
-
- if (test->procname && ref->procname &&
- (strcmp(test->procname, ref->procname) == 0))
- match++;
-
- if (match) {
- if (cur_depth != 0) {
- cur_depth--;
- ref = ref->child;
- goto repeat;
- }
- goto out;
- }
- }
- }
- ref = NULL;
-out:
- sysctl_head_finish(head);
- return ref;
-}
-
-static void set_fail(const char **fail, struct ctl_table *table, const char *str)
-{
- if (*fail) {
- printk(KERN_ERR "sysctl table check failed: ");
- sysctl_print_path(table);
- printk(" %s\n", *fail);
- dump_stack();
- }
- *fail = str;
-}
-
-static void sysctl_check_leaf(struct nsproxy *namespaces,
- struct ctl_table *table, const char **fail)
-{
- struct ctl_table *ref;
-
- ref = sysctl_check_lookup(namespaces, table);
- if (ref && (ref != table))
- set_fail(fail, table, "Sysctl already exists");
-}
-
-int sysctl_check_table(struct nsproxy *namespaces, struct ctl_table *table)
-{
- int error = 0;
- for (; table->procname; table++) {
- const char *fail = NULL;
-
- if (table->parent) {
- if (!table->parent->procname)
- set_fail(&fail, table, "Parent without procname");
- }
- if (table->child) {
- if (table->data)
- set_fail(&fail, table, "Directory with data?");
- if (table->maxlen)
- set_fail(&fail, table, "Directory with maxlen?");
- if ((table->mode & (S_IRUGO|S_IXUGO)) != table->mode)
- set_fail(&fail, table, "Writable sysctl directory");
- if (table->proc_handler)
- set_fail(&fail, table, "Directory with proc_handler");
- if (table->extra1)
- set_fail(&fail, table, "Directory with extra1");
- if (table->extra2)
- set_fail(&fail, table, "Directory with extra2");
- } else {
- if ((table->proc_handler == proc_dostring) ||
- (table->proc_handler == proc_dointvec) ||
- (table->proc_handler == proc_dointvec_minmax) ||
- (table->proc_handler == proc_dointvec_jiffies) ||
- (table->proc_handler == proc_dointvec_userhz_jiffies) ||
- (table->proc_handler == proc_dointvec_ms_jiffies) ||
- (table->proc_handler == proc_doulongvec_minmax) ||
- (table->proc_handler == proc_doulongvec_ms_jiffies_minmax)) {
- if (!table->data)
- set_fail(&fail, table, "No data");
- if (!table->maxlen)
- set_fail(&fail, table, "No maxlen");
- }
-#ifdef CONFIG_PROC_SYSCTL
- if (!table->proc_handler)
- set_fail(&fail, table, "No proc_handler");
-#endif
- sysctl_check_leaf(namespaces, table, &fail);
- }
- if (table->mode > 0777)
- set_fail(&fail, table, "bogus .mode");
- if (fail) {
- set_fail(&fail, table, NULL);
- error = -EINVAL;
- }
- if (table->child)
- error |= sysctl_check_table(namespaces, table->child);
- }
- return error;
-}
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