#include <linux/writeback.h>
#include <linux/hugetlb.h>
#include <linux/initrd.h>
+#include <linux/key.h>
#include <linux/times.h>
#include <linux/limits.h>
#include <linux/dcache.h>
#include <linux/syscalls.h>
+#include <linux/vmstat.h>
#include <linux/nfs_fs.h>
#include <linux/acpi.h>
#include <linux/reboot.h>
+#include <linux/ftrace.h>
+#include <linux/slow-work.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
extern int sysctl_drop_caches;
extern int percpu_pagelist_fraction;
extern int compat_log;
-extern int maps_protect;
-extern int sysctl_stat_interval;
extern int latencytop_enabled;
-
-/* Constants used for minimum and maximum */
-#if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
-static int one = 1;
+extern int sysctl_nr_open_min, sysctl_nr_open_max;
+#ifndef CONFIG_MMU
+extern int sysctl_nr_trim_pages;
#endif
+#ifdef CONFIG_RCU_TORTURE_TEST
+extern int rcutorture_runnable;
+#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
+/* Constants used for minimum and maximum */
#ifdef CONFIG_DETECT_SOFTLOCKUP
static int sixty = 60;
-#endif
-
-#ifdef CONFIG_MMU
-static int two = 2;
+static int neg_one = -1;
#endif
static int zero;
+static int __maybe_unused one = 1;
+static int __maybe_unused two = 2;
+static unsigned long one_ul = 1;
static int one_hundred = 100;
+static int one_thousand = 1000;
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int ngroups_max = NGROUPS_MAX;
-#ifdef CONFIG_KMOD
+#ifdef CONFIG_MODULES
extern char modprobe_path[];
#endif
#ifdef CONFIG_CHR_DEV_SG
extern int sg_big_buff;
#endif
-#ifdef __sparc__
-extern char reboot_command [];
-extern int stop_a_enabled;
-extern int scons_pwroff;
+#ifdef CONFIG_SPARC
+#include <asm/system.h>
+#endif
+
+#ifdef CONFIG_SPARC64
+extern int sysctl_tsb_ratio;
#endif
#ifdef __hppa__
extern int spin_retry;
#endif
-extern int sysctl_hz_timer;
-
#ifdef CONFIG_BSD_PROCESS_ACCT
extern int acct_parm[];
#endif
#ifdef CONFIG_IA64
extern int no_unaligned_warning;
+extern int unaligned_dump_stack;
#endif
#ifdef CONFIG_RT_MUTEXES
extern int max_lock_depth;
#endif
-#ifdef CONFIG_SYSCTL_SYSCALL
-static int parse_table(int __user *, int, void __user *, size_t __user *,
- void __user *, size_t, struct ctl_table *);
-#endif
-
-
#ifdef CONFIG_PROC_SYSCTL
static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
-static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
+static int proc_taint(struct ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
#endif
static struct ctl_table root_table[];
static struct ctl_table_root sysctl_table_root;
static struct ctl_table_header root_table_header = {
+ .count = 1,
.ctl_table = root_table,
- .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
+ .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
.root = &sysctl_table_root,
+ .set = &sysctl_table_root.default_set,
};
static struct ctl_table_root sysctl_table_root = {
.root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
- .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
+ .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
};
static struct ctl_table kern_table[];
#ifdef CONFIG_INOTIFY_USER
extern struct ctl_table inotify_table[];
#endif
+#ifdef CONFIG_EPOLL
+extern struct ctl_table epoll_table[];
+#endif
#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
int sysctl_legacy_va_layout;
.extra1 = &min_wakeup_granularity_ns,
.extra2 = &max_wakeup_granularity_ns,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "sched_shares_ratelimit",
+ .data = &sysctl_sched_shares_ratelimit,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "sched_shares_thresh",
+ .data = &sysctl_sched_shares_thresh,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &zero,
+ },
{
.ctl_name = CTL_UNNUMBERED,
.procname = "sched_child_runs_first",
#ifdef CONFIG_PROC_SYSCTL
{
.procname = "tainted",
- .data = &tainted,
- .maxlen = sizeof(int),
+ .maxlen = sizeof(long),
.mode = 0644,
- .proc_handler = &proc_dointvec_taint,
+ .proc_handler = &proc_taint,
},
#endif
#ifdef CONFIG_LATENCYTOP
.mode = 0644,
.proc_handler = &proc_dointvec,
},
-#ifdef __sparc__
+#ifdef CONFIG_SPARC
{
.ctl_name = KERN_SPARC_REBOOT,
.procname = "reboot-cmd",
.proc_handler = &proc_dointvec,
},
#endif
+#ifdef CONFIG_SPARC64
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "tsb-ratio",
+ .data = &sysctl_tsb_ratio,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+#endif
#ifdef __hppa__
{
.ctl_name = KERN_HPPA_PWRSW,
.mode = 0644,
.proc_handler = &proc_dointvec,
},
-#ifdef CONFIG_KMOD
+#ifdef CONFIG_FUNCTION_TRACER
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "ftrace_enabled",
+ .data = &ftrace_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &ftrace_enable_sysctl,
+ },
+#endif
+#ifdef CONFIG_STACK_TRACER
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "stack_tracer_enabled",
+ .data = &stack_tracer_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &stack_trace_sysctl,
+ },
+#endif
+#ifdef CONFIG_TRACING
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "ftrace_dump_on_oops",
+ .data = &ftrace_dump_on_oops,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+#endif
+#ifdef CONFIG_MODULES
{
.ctl_name = KERN_MODPROBE,
.procname = "modprobe",
.mode = 0644,
.proc_handler = &proc_dointvec,
},
-#endif
-#ifdef CONFIG_NO_IDLE_HZ
- {
- .ctl_name = KERN_HZ_TIMER,
- .procname = "hz_timer",
- .data = &sysctl_hz_timer,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
#endif
{
.ctl_name = KERN_S390_USER_DEBUG_LOGGING,
{
.ctl_name = KERN_PRINTK_RATELIMIT,
.procname = "printk_ratelimit",
- .data = &printk_ratelimit_jiffies,
+ .data = &printk_ratelimit_state.interval,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
{
.ctl_name = KERN_PRINTK_RATELIMIT_BURST,
.procname = "printk_ratelimit_burst",
- .data = &printk_ratelimit_burst,
+ .data = &printk_ratelimit_state.burst,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
.mode = 0644,
.proc_handler = &proc_dointvec,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "unaligned-dump-stack",
+ .data = &unaligned_dump_stack,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
#endif
#ifdef CONFIG_DETECT_SOFTLOCKUP
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "softlockup_panic",
+ .data = &softlockup_panic,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
{
.ctl_name = CTL_UNNUMBERED,
.procname = "softlockup_thresh",
.data = &softlockup_thresh,
- .maxlen = sizeof(unsigned long),
+ .maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = &proc_doulongvec_minmax,
+ .proc_handler = &proc_dosoftlockup_thresh,
.strategy = &sysctl_intvec,
- .extra1 = &one,
+ .extra1 = &neg_one,
.extra2 = &sixty,
},
{
.proc_handler = &proc_dointvec,
},
#endif
-#ifdef CONFIG_PROC_FS
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "poweroff_cmd",
+ .data = &poweroff_cmd,
+ .maxlen = POWEROFF_CMD_PATH_LEN,
+ .mode = 0644,
+ .proc_handler = &proc_dostring,
+ .strategy = &sysctl_string,
+ },
+#ifdef CONFIG_KEYS
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "keys",
+ .mode = 0555,
+ .child = key_sysctls,
+ },
+#endif
+#ifdef CONFIG_RCU_TORTURE_TEST
{
.ctl_name = CTL_UNNUMBERED,
- .procname = "maps_protect",
- .data = &maps_protect,
+ .procname = "rcutorture_runnable",
+ .data = &rcutorture_runnable,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
#endif
+#ifdef CONFIG_UNEVICTABLE_LRU
{
.ctl_name = CTL_UNNUMBERED,
- .procname = "poweroff_cmd",
- .data = &poweroff_cmd,
- .maxlen = POWEROFF_CMD_PATH_LEN,
+ .procname = "scan_unevictable_pages",
+ .data = &scan_unevictable_pages,
+ .maxlen = sizeof(scan_unevictable_pages),
.mode = 0644,
- .proc_handler = &proc_dostring,
- .strategy = &sysctl_string,
+ .proc_handler = &scan_unevictable_handler,
},
+#endif
+#ifdef CONFIG_SLOW_WORK
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "slow-work",
+ .mode = 0555,
+ .child = slow_work_sysctls,
+ },
+#endif
/*
* NOTE: do not add new entries to this table unless you have read
* Documentation/sysctl/ctl_unnumbered.txt
.data = &dirty_background_ratio,
.maxlen = sizeof(dirty_background_ratio),
.mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
+ .proc_handler = &dirty_background_ratio_handler,
.strategy = &sysctl_intvec,
.extra1 = &zero,
.extra2 = &one_hundred,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "dirty_background_bytes",
+ .data = &dirty_background_bytes,
+ .maxlen = sizeof(dirty_background_bytes),
+ .mode = 0644,
+ .proc_handler = &dirty_background_bytes_handler,
+ .strategy = &sysctl_intvec,
+ .extra1 = &one_ul,
+ },
{
.ctl_name = VM_DIRTY_RATIO,
.procname = "dirty_ratio",
.extra1 = &zero,
.extra2 = &one_hundred,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "dirty_bytes",
+ .data = &vm_dirty_bytes,
+ .maxlen = sizeof(vm_dirty_bytes),
+ .mode = 0644,
+ .proc_handler = &dirty_bytes_handler,
+ .strategy = &sysctl_intvec,
+ .extra1 = &one_ul,
+ },
{
.procname = "dirty_writeback_centisecs",
.data = &dirty_writeback_interval,
.data = &dirty_expire_interval,
.maxlen = sizeof(dirty_expire_interval),
.mode = 0644,
- .proc_handler = &proc_dointvec_userhz_jiffies,
+ .proc_handler = &proc_dointvec,
},
{
.ctl_name = VM_NR_PDFLUSH_THREADS,
.mode = 0444 /* read-only*/,
.proc_handler = &proc_dointvec,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "nr_pdflush_threads_min",
+ .data = &nr_pdflush_threads_min,
+ .maxlen = sizeof nr_pdflush_threads_min,
+ .mode = 0644 /* read-write */,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &one,
+ .extra2 = &nr_pdflush_threads_max,
+ },
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "nr_pdflush_threads_max",
+ .data = &nr_pdflush_threads_max,
+ .maxlen = sizeof nr_pdflush_threads_max,
+ .mode = 0644 /* read-write */,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &nr_pdflush_threads_min,
+ .extra2 = &one_thousand,
+ },
{
.ctl_name = VM_SWAPPINESS,
.procname = "swappiness",
#ifdef CONFIG_HUGETLB_PAGE
{
.procname = "nr_hugepages",
- .data = &max_huge_pages,
+ .data = NULL,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = &hugetlb_sysctl_handler,
{
.ctl_name = CTL_UNNUMBERED,
.procname = "nr_overcommit_hugepages",
- .data = &sysctl_overcommit_huge_pages,
- .maxlen = sizeof(sysctl_overcommit_huge_pages),
+ .data = NULL,
+ .maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = &hugetlb_overcommit_handler,
+ .extra1 = (void *)&hugetlb_zero,
+ .extra2 = (void *)&hugetlb_infinity,
},
#endif
{
.mode = 0644,
.proc_handler = &proc_dointvec
},
+#else
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "nr_trim_pages",
+ .data = &sysctl_nr_trim_pages,
+ .maxlen = sizeof(sysctl_nr_trim_pages),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &zero,
+ },
#endif
{
.ctl_name = VM_LAPTOP_MODE,
.data = &sysctl_nr_open,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = &proc_dointvec_minmax,
+ .extra1 = &sysctl_nr_open_min,
+ .extra2 = &sysctl_nr_open_max,
},
{
.ctl_name = FS_DENTRY,
.extra1 = &minolduid,
.extra2 = &maxolduid,
},
+#ifdef CONFIG_FILE_LOCKING
{
.ctl_name = FS_LEASES,
.procname = "leases-enable",
.mode = 0644,
.proc_handler = &proc_dointvec,
},
+#endif
#ifdef CONFIG_DNOTIFY
{
.ctl_name = FS_DIR_NOTIFY,
},
#endif
#ifdef CONFIG_MMU
+#ifdef CONFIG_FILE_LOCKING
{
.ctl_name = FS_LEASE_TIME,
.procname = "lease-break-time",
.data = &lease_break_time,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
- .strategy = &sysctl_intvec,
- .extra1 = &zero,
- .extra2 = &two,
+ .proc_handler = &proc_dointvec,
},
+#endif
+#ifdef CONFIG_AIO
{
.procname = "aio-nr",
.data = &aio_nr,
.mode = 0644,
.proc_handler = &proc_doulongvec_minmax,
},
+#endif /* CONFIG_AIO */
#ifdef CONFIG_INOTIFY_USER
{
.ctl_name = FS_INOTIFY,
.child = inotify_table,
},
#endif
+#ifdef CONFIG_EPOLL
+ {
+ .procname = "epoll",
+ .mode = 0555,
+ .child = epoll_table,
+ },
+#endif
#endif
{
.ctl_name = KERN_SETUID_DUMPABLE,
.data = &suid_dumpable,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &zero,
+ .extra2 = &two,
},
#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
{
spin_unlock(&sysctl_lock);
wait_for_completion(&wait);
spin_lock(&sysctl_lock);
+ } else {
+ /* anything non-NULL; we'll never dereference it */
+ p->unregistering = ERR_PTR(-EINVAL);
}
/*
* do not remove from the list until nobody holds it; walking the
list_del_init(&p->ctl_entry);
}
+void sysctl_head_get(struct ctl_table_header *head)
+{
+ spin_lock(&sysctl_lock);
+ head->count++;
+ spin_unlock(&sysctl_lock);
+}
+
+void sysctl_head_put(struct ctl_table_header *head)
+{
+ spin_lock(&sysctl_lock);
+ if (!--head->count)
+ kfree(head);
+ spin_unlock(&sysctl_lock);
+}
+
+struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
+{
+ if (!head)
+ BUG();
+ spin_lock(&sysctl_lock);
+ if (!use_table(head))
+ head = ERR_PTR(-ENOENT);
+ spin_unlock(&sysctl_lock);
+ return head;
+}
+
void sysctl_head_finish(struct ctl_table_header *head)
{
if (!head)
spin_unlock(&sysctl_lock);
}
+static struct ctl_table_set *
+lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
+{
+ struct ctl_table_set *set = &root->default_set;
+ if (root->lookup)
+ set = root->lookup(root, namespaces);
+ return set;
+}
+
static struct list_head *
lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
{
- struct list_head *header_list;
- header_list = &root->header_list;
- if (root->lookup)
- header_list = root->lookup(root, namespaces);
- return header_list;
+ struct ctl_table_set *set = lookup_header_set(root, namespaces);
+ return &set->list;
}
struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
}
#ifdef CONFIG_SYSCTL_SYSCALL
+/* Perform the actual read/write of a sysctl table entry. */
+static int do_sysctl_strategy(struct ctl_table_root *root,
+ struct ctl_table *table,
+ void __user *oldval, size_t __user *oldlenp,
+ void __user *newval, size_t newlen)
+{
+ int op = 0, rc;
+
+ if (oldval)
+ op |= MAY_READ;
+ if (newval)
+ op |= MAY_WRITE;
+ if (sysctl_perm(root, table, op))
+ return -EPERM;
+
+ if (table->strategy) {
+ rc = table->strategy(table, oldval, oldlenp, newval, newlen);
+ if (rc < 0)
+ return rc;
+ if (rc > 0)
+ return 0;
+ }
+
+ /* If there is no strategy routine, or if the strategy returns
+ * zero, proceed with automatic r/w */
+ if (table->data && table->maxlen) {
+ rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
+ if (rc < 0)
+ return rc;
+ }
+ return 0;
+}
+
+static int parse_table(int __user *name, int nlen,
+ void __user *oldval, size_t __user *oldlenp,
+ void __user *newval, size_t newlen,
+ struct ctl_table_root *root,
+ struct ctl_table *table)
+{
+ int n;
+repeat:
+ if (!nlen)
+ return -ENOTDIR;
+ if (get_user(n, name))
+ return -EFAULT;
+ for ( ; table->ctl_name || table->procname; table++) {
+ if (!table->ctl_name)
+ continue;
+ if (n == table->ctl_name) {
+ int error;
+ if (table->child) {
+ if (sysctl_perm(root, table, MAY_EXEC))
+ return -EPERM;
+ name++;
+ nlen--;
+ table = table->child;
+ goto repeat;
+ }
+ error = do_sysctl_strategy(root, table,
+ oldval, oldlenp,
+ newval, newlen);
+ return error;
+ }
+ }
+ return -ENOTDIR;
+}
+
int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
for (head = sysctl_head_next(NULL); head;
head = sysctl_head_next(head)) {
error = parse_table(name, nlen, oldval, oldlenp,
- newval, newlen, head->ctl_table);
+ newval, newlen,
+ head->root, head->ctl_table);
if (error != -ENOTDIR) {
sysctl_head_finish(head);
break;
return error;
}
-asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
+SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
{
struct __sysctl_args tmp;
int error;
static int test_perm(int mode, int op)
{
- if (!current->euid)
+ if (!current_euid())
mode >>= 6;
else if (in_egroup_p(0))
mode >>= 3;
- if ((mode & op & 0007) == op)
+ if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
return 0;
return -EACCES;
}
-int sysctl_perm(struct ctl_table *table, int op)
+int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
{
int error;
- error = security_sysctl(table, op);
+ int mode;
+
+ error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
if (error)
return error;
- return test_perm(table->mode, op);
-}
-#ifdef CONFIG_SYSCTL_SYSCALL
-static int parse_table(int __user *name, int nlen,
- void __user *oldval, size_t __user *oldlenp,
- void __user *newval, size_t newlen,
- struct ctl_table *table)
-{
- int n;
-repeat:
- if (!nlen)
- return -ENOTDIR;
- if (get_user(n, name))
- return -EFAULT;
- for ( ; table->ctl_name || table->procname; table++) {
- if (!table->ctl_name)
- continue;
- if (n == table->ctl_name) {
- int error;
- if (table->child) {
- if (sysctl_perm(table, 001))
- return -EPERM;
- name++;
- nlen--;
- table = table->child;
- goto repeat;
- }
- error = do_sysctl_strategy(table, name, nlen,
- oldval, oldlenp,
- newval, newlen);
- return error;
- }
- }
- return -ENOTDIR;
-}
+ if (root->permissions)
+ mode = root->permissions(root, current->nsproxy, table);
+ else
+ mode = table->mode;
-/* Perform the actual read/write of a sysctl table entry. */
-int do_sysctl_strategy (struct ctl_table *table,
- int __user *name, int nlen,
- void __user *oldval, size_t __user *oldlenp,
- void __user *newval, size_t newlen)
-{
- int op = 0, rc;
-
- if (oldval)
- op |= 004;
- if (newval)
- op |= 002;
- if (sysctl_perm(table, op))
- return -EPERM;
-
- if (table->strategy) {
- rc = table->strategy(table, name, nlen, oldval, oldlenp,
- newval, newlen);
- if (rc < 0)
- return rc;
- if (rc > 0)
- return 0;
- }
-
- /* If there is no strategy routine, or if the strategy returns
- * zero, proceed with automatic r/w */
- if (table->data && table->maxlen) {
- rc = sysctl_data(table, name, nlen, oldval, oldlenp,
- newval, newlen);
- if (rc < 0)
- return rc;
- }
- return 0;
+ return test_perm(mode, op);
}
-#endif /* CONFIG_SYSCTL_SYSCALL */
static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
{
static __init int sysctl_init(void)
{
- int err;
sysctl_set_parent(NULL, root_table);
- err = sysctl_check_table(current->nsproxy, root_table);
+#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
+ {
+ int err;
+ err = sysctl_check_table(current->nsproxy, root_table);
+ }
+#endif
return 0;
}
core_initcall(sysctl_init);
+static struct ctl_table *is_branch_in(struct ctl_table *branch,
+ struct ctl_table *table)
+{
+ struct ctl_table *p;
+ const char *s = branch->procname;
+
+ /* branch should have named subdirectory as its first element */
+ if (!s || !branch->child)
+ return NULL;
+
+ /* ... and nothing else */
+ if (branch[1].procname || branch[1].ctl_name)
+ return NULL;
+
+ /* table should contain subdirectory with the same name */
+ for (p = table; p->procname || p->ctl_name; p++) {
+ if (!p->child)
+ continue;
+ if (p->procname && strcmp(p->procname, s) == 0)
+ return p;
+ }
+ return NULL;
+}
+
+/* see if attaching q to p would be an improvement */
+static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
+{
+ struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
+ struct ctl_table *next;
+ int is_better = 0;
+ int not_in_parent = !p->attached_by;
+
+ while ((next = is_branch_in(by, to)) != NULL) {
+ if (by == q->attached_by)
+ is_better = 1;
+ if (to == p->attached_by)
+ not_in_parent = 1;
+ by = by->child;
+ to = next->child;
+ }
+
+ if (is_better && not_in_parent) {
+ q->attached_by = by;
+ q->attached_to = to;
+ q->parent = p;
+ }
+}
+
/**
* __register_sysctl_paths - register a sysctl hierarchy
* @root: List of sysctl headers to register on
struct nsproxy *namespaces,
const struct ctl_path *path, struct ctl_table *table)
{
- struct list_head *header_list;
struct ctl_table_header *header;
struct ctl_table *new, **prevp;
unsigned int n, npath;
+ struct ctl_table_set *set;
/* Count the path components */
for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
header->unregistering = NULL;
header->root = root;
sysctl_set_parent(NULL, header->ctl_table);
+ header->count = 1;
+#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
if (sysctl_check_table(namespaces, header->ctl_table)) {
kfree(header);
return NULL;
}
+#endif
spin_lock(&sysctl_lock);
- header_list = lookup_header_list(root, namespaces);
- list_add_tail(&header->ctl_entry, header_list);
+ header->set = lookup_header_set(root, namespaces);
+ header->attached_by = header->ctl_table;
+ header->attached_to = root_table;
+ header->parent = &root_table_header;
+ for (set = header->set; set; set = set->parent) {
+ struct ctl_table_header *p;
+ list_for_each_entry(p, &set->list, ctl_entry) {
+ if (p->unregistering)
+ continue;
+ try_attach(p, header);
+ }
+ }
+ header->parent->count++;
+ list_add_tail(&header->ctl_entry, &header->set->list);
spin_unlock(&sysctl_lock);
return header;
spin_lock(&sysctl_lock);
start_unregistering(header);
+ if (!--header->parent->count) {
+ WARN_ON(1);
+ kfree(header->parent);
+ }
+ if (!--header->count)
+ kfree(header);
spin_unlock(&sysctl_lock);
- kfree(header);
+}
+
+int sysctl_is_seen(struct ctl_table_header *p)
+{
+ struct ctl_table_set *set = p->set;
+ int res;
+ spin_lock(&sysctl_lock);
+ if (p->unregistering)
+ res = 0;
+ else if (!set->is_seen)
+ res = 1;
+ else
+ res = set->is_seen(set);
+ spin_unlock(&sysctl_lock);
+ return res;
+}
+
+void setup_sysctl_set(struct ctl_table_set *p,
+ struct ctl_table_set *parent,
+ int (*is_seen)(struct ctl_table_set *))
+{
+ INIT_LIST_HEAD(&p->list);
+ p->parent = parent ? parent : &sysctl_table_root.default_set;
+ p->is_seen = is_seen;
}
#else /* !CONFIG_SYSCTL */
{
}
+void setup_sysctl_set(struct ctl_table_set *p,
+ struct ctl_table_set *parent,
+ int (*is_seen)(struct ctl_table_set *))
+{
+}
+
+void sysctl_head_put(struct ctl_table_header *head)
+{
+}
+
#endif /* CONFIG_SYSCTL */
/*
NULL,NULL);
}
-#define OP_SET 0
-#define OP_AND 1
-#define OP_OR 2
-
-static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
- int *valp,
- int write, void *data)
-{
- int op = *(int *)data;
- if (write) {
- int val = *negp ? -*lvalp : *lvalp;
- switch(op) {
- case OP_SET: *valp = val; break;
- case OP_AND: *valp &= val; break;
- case OP_OR: *valp |= val; break;
- }
- } else {
- int val = *valp;
- if (val < 0) {
- *negp = -1;
- *lvalp = (unsigned long)-val;
- } else {
- *negp = 0;
- *lvalp = (unsigned long)val;
- }
- }
- return 0;
-}
-
/*
- * Taint values can only be increased
+ * Taint values can only be increased
+ * This means we can safely use a temporary.
*/
-static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
+static int proc_taint(struct ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
- int op;
+ struct ctl_table t;
+ unsigned long tmptaint = get_taint();
+ int err;
if (write && !capable(CAP_SYS_ADMIN))
return -EPERM;
- op = OP_OR;
- return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
- do_proc_dointvec_bset_conv,&op);
+ t = *table;
+ t.data = &tmptaint;
+ err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
+ if (err < 0)
+ return err;
+
+ if (write) {
+ /*
+ * Poor man's atomic or. Not worth adding a primitive
+ * to everyone's atomic.h for this
+ */
+ int i;
+ for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
+ if ((tmptaint >> i) & 1)
+ add_taint(i);
+ }
+ }
+
+ return err;
}
struct do_proc_dointvec_minmax_conv_param {
*/
/* The generic sysctl data routine (used if no strategy routine supplied) */
-int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_data(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
}
/* The generic string strategy routine: */
-int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_string(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
* are between the minimum and maximum values given in the arrays
* table->extra1 and table->extra2, respectively.
*/
-int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_intvec(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
}
/* Strategy function to convert jiffies to seconds */
-int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
}
/* Strategy function to convert jiffies to seconds */
-int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_ms_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
#else /* CONFIG_SYSCTL_SYSCALL */
-asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
+SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
{
struct __sysctl_args tmp;
int error;
return error;
}
-int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_data(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}
-int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_string(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}
-int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_intvec(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}
-int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}
-int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_ms_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
Code Review / linux-2.6.git / blobdiff