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* sysctl ctl_table constification
 
   Constifying ctl_table structs prevents the modification of proc_handler
   function pointers. All ctl_table struct arguments are const qualified in the
   sysctl API in such a way that the ctl_table arrays being defined elsewhere
   and passed through sysctl can be constified one-by-one. We kick the
   constification off by qualifying user_table in kernel/ucount.c and expect all
   the ctl_tables to be constified in the coming releases.
 
 * Misc fixes
 
   Adjust comments in two places to better reflect the code. Remove superfluous
   dput calls. Remove Luis from sysctl maintainership. Replace comments about
   holding a lock with calls to lockdep_assert_held.
 
 * Testing
 
   All these went through 0-day and they have all been in linux-next for at
   least 1 month (since Oct-24). I also rand these through the sysctl selftest
   for x86_64.
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Merge tag 'sysctl-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/sysctl/sysctl

Pull sysctl updates from Joel Granados:
 "sysctl ctl_table constification:

   - Constifying ctl_table structs prevents the modification of
     proc_handler function pointers. All ctl_table struct arguments are
     const qualified in the sysctl API in such a way that the ctl_table
     arrays being defined elsewhere and passed through sysctl can be
     constified one-by-one.

     We kick the constification off by qualifying user_table in
     kernel/ucount.c and expect all the ctl_tables to be constified in
     the coming releases.

  Misc fixes:

   - Adjust comments in two places to better reflect the code

   - Remove superfluous dput calls

   - Remove Luis from sysctl maintainership

   - Replace comments about holding a lock with calls to
     lockdep_assert_held"

* tag 'sysctl-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/sysctl/sysctl:
  sysctl: Reduce dput(child) calls in proc_sys_fill_cache()
  sysctl: Reorganize kerneldoc parameter names
  ucounts: constify sysctl table user_table
  sysctl: update comments to new registration APIs
  MAINTAINERS: remove me from sysctl
  sysctl: Convert locking comments to lockdep assertions
  const_structs.checkpatch: add ctl_table
  sysctl: make internal ctl_tables const
  sysctl: allow registration of const struct ctl_table
  sysctl: move internal interfaces to const struct ctl_table
  bpf: Constify ctl_table argument of filter function
This commit is contained in:
Linus Torvalds 2024-11-22 20:36:11 -08:00
commit 980f8f8fd4
9 changed files with 73 additions and 69 deletions
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1
MAINTAINERS
View file

@ -18641,7 +18641,6 @@ F: include/linux/proc_fs.h
F: tools/testing/selftests/proc/
PROC SYSCTL
M: Luis Chamberlain <mcgrof@kernel.org>
M: Kees Cook <kees@kernel.org>
M: Joel Granados <joel.granados@kernel.org>
L: linux-kernel@vger.kernel.org

2
fs/proc/internal.h
View file

@ -102,7 +102,7 @@ struct proc_inode {
union proc_op op;
struct proc_dir_entry *pde;
struct ctl_table_header *sysctl;
struct ctl_table *sysctl_entry;
const struct ctl_table *sysctl_entry;
struct hlist_node sibling_inodes;
const struct proc_ns_operations *ns_ops;
struct inode vfs_inode;

113
fs/proc/proc_sysctl.c
View file

@ -17,6 +17,7 @@
#include <linux/bpf-cgroup.h>
#include <linux/mount.h>
#include <linux/kmemleak.h>
#include <linux/lockdep.h>
#include "internal.h"
#define list_for_each_table_entry(entry, header) \
@ -33,7 +34,7 @@ static const struct inode_operations proc_sys_dir_operations;
* Support for permanently empty directories.
* Must be non-empty to avoid sharing an address with other tables.
*/
static struct ctl_table sysctl_mount_point[] = {
static const struct ctl_table sysctl_mount_point[] = {
{ }
};
@ -67,7 +68,7 @@ void proc_sys_poll_notify(struct ctl_table_poll *poll)
wake_up_interruptible(&poll->wait);
}
static struct ctl_table root_table[] = {
static const struct ctl_table root_table[] = {
{
.procname = "",
.mode = S_IFDIR|S_IRUGO|S_IXUGO,
@ -88,7 +89,7 @@ static DEFINE_SPINLOCK(sysctl_lock);
static void drop_sysctl_table(struct ctl_table_header *header);
static int sysctl_follow_link(struct ctl_table_header **phead,
struct ctl_table **pentry);
const struct ctl_table **pentry);
static int insert_links(struct ctl_table_header *head);
static void put_links(struct ctl_table_header *header);
@ -109,14 +110,15 @@ static int namecmp(const char *name1, int len1, const char *name2, int len2)
return cmp;
}
/* Called under sysctl_lock */
static struct ctl_table *find_entry(struct ctl_table_header **phead,
static const struct ctl_table *find_entry(struct ctl_table_header **phead,
struct ctl_dir *dir, const char *name, int namelen)
{
struct ctl_table_header *head;
struct ctl_table *entry;
const struct ctl_table *entry;
struct rb_node *node = dir->root.rb_node;
lockdep_assert_held(&sysctl_lock);
while (node)
{
struct ctl_node *ctl_node;
@ -141,7 +143,7 @@ static struct ctl_table *find_entry(struct ctl_table_header **phead,
return NULL;
}
static int insert_entry(struct ctl_table_header *head, struct ctl_table *entry)
static int insert_entry(struct ctl_table_header *head, const struct ctl_table *entry)
{
struct rb_node *node = &head->node[entry - head->ctl_table].node;
struct rb_node **p = &head->parent->root.rb_node;
@ -151,7 +153,7 @@ static int insert_entry(struct ctl_table_header *head, struct ctl_table *entry)
while (*p) {
struct ctl_table_header *parent_head;
struct ctl_table *parent_entry;
const struct ctl_table *parent_entry;
struct ctl_node *parent_node;
const char *parent_name;
int cmp;
@ -180,7 +182,7 @@ static int insert_entry(struct ctl_table_header *head, struct ctl_table *entry)
return 0;
}
static void erase_entry(struct ctl_table_header *head, struct ctl_table *entry)
static void erase_entry(struct ctl_table_header *head, const struct ctl_table *entry)
{
struct rb_node *node = &head->node[entry - head->ctl_table].node;
@ -189,7 +191,7 @@ static void erase_entry(struct ctl_table_header *head, struct ctl_table *entry)
static void init_header(struct ctl_table_header *head,
struct ctl_table_root *root, struct ctl_table_set *set,
struct ctl_node *node, struct ctl_table *table, size_t table_size)
struct ctl_node *node, const struct ctl_table *table, size_t table_size)
{
head->ctl_table = table;
head->ctl_table_size = table_size;
@ -204,7 +206,7 @@ static void init_header(struct ctl_table_header *head,
head->node = node;
INIT_HLIST_HEAD(&head->inodes);
if (node) {
struct ctl_table *entry;
const struct ctl_table *entry;
list_for_each_table_entry(entry, head) {
node->header = head;
@ -217,7 +219,7 @@ static void init_header(struct ctl_table_header *head,
static void erase_header(struct ctl_table_header *head)
{
struct ctl_table *entry;
const struct ctl_table *entry;
list_for_each_table_entry(entry, head)
erase_entry(head, entry);
@ -225,7 +227,7 @@ static void erase_header(struct ctl_table_header *head)
static int insert_header(struct ctl_dir *dir, struct ctl_table_header *header)
{
struct ctl_table *entry;
const struct ctl_table *entry;
struct ctl_table_header *dir_h = &dir->header;
int err;
@ -263,18 +265,20 @@ static int insert_header(struct ctl_dir *dir, struct ctl_table_header *header)
return err;
}
/* called under sysctl_lock */
static int use_table(struct ctl_table_header *p)
{
lockdep_assert_held(&sysctl_lock);
if (unlikely(p->unregistering))
return 0;
p->used++;
return 1;
}
/* called under sysctl_lock */
static void unuse_table(struct ctl_table_header *p)
{
lockdep_assert_held(&sysctl_lock);
if (!--p->used)
if (unlikely(p->unregistering))
complete(p->unregistering);
@ -285,9 +289,11 @@ static void proc_sys_invalidate_dcache(struct ctl_table_header *head)
proc_invalidate_siblings_dcache(&head->inodes, &sysctl_lock);
}
/* called under sysctl_lock, will reacquire if has to wait */
static void start_unregistering(struct ctl_table_header *p)
{
/* will reacquire if has to wait */
lockdep_assert_held(&sysctl_lock);
/*
* if p->used is 0, nobody will ever touch that entry again;
* we'll eliminate all paths to it before dropping sysctl_lock
@ -344,12 +350,12 @@ lookup_header_set(struct ctl_table_root *root)
return set;
}
static struct ctl_table *lookup_entry(struct ctl_table_header **phead,
struct ctl_dir *dir,
const char *name, int namelen)
static const struct ctl_table *lookup_entry(struct ctl_table_header **phead,
struct ctl_dir *dir,
const char *name, int namelen)
{
struct ctl_table_header *head;
struct ctl_table *entry;
const struct ctl_table *entry;
spin_lock(&sysctl_lock);
entry = find_entry(&head, dir, name, namelen);
@ -374,10 +380,10 @@ static struct ctl_node *first_usable_entry(struct rb_node *node)
}
static void first_entry(struct ctl_dir *dir,
struct ctl_table_header **phead, struct ctl_table **pentry)
struct ctl_table_header **phead, const struct ctl_table **pentry)
{
struct ctl_table_header *head = NULL;
struct ctl_table *entry = NULL;
const struct ctl_table *entry = NULL;
struct ctl_node *ctl_node;
spin_lock(&sysctl_lock);
@ -391,10 +397,10 @@ static void first_entry(struct ctl_dir *dir,
*pentry = entry;
}
static void next_entry(struct ctl_table_header **phead, struct ctl_table **pentry)
static void next_entry(struct ctl_table_header **phead, const struct ctl_table **pentry)
{
struct ctl_table_header *head = *phead;
struct ctl_table *entry = *pentry;
const struct ctl_table *entry = *pentry;
struct ctl_node *ctl_node = &head->node[entry - head->ctl_table];
spin_lock(&sysctl_lock);
@ -427,7 +433,7 @@ static int test_perm(int mode, int op)
return -EACCES;
}
static int sysctl_perm(struct ctl_table_header *head, struct ctl_table *table, int op)
static int sysctl_perm(struct ctl_table_header *head, const struct ctl_table *table, int op)
{
struct ctl_table_root *root = head->root;
int mode;
@ -441,7 +447,7 @@ static int sysctl_perm(struct ctl_table_header *head, struct ctl_table *table, i
}
static struct inode *proc_sys_make_inode(struct super_block *sb,
struct ctl_table_header *head, struct ctl_table *table)
struct ctl_table_header *head, const struct ctl_table *table)
{
struct ctl_table_root *root = head->root;
struct inode *inode;
@ -512,7 +518,7 @@ static struct dentry *proc_sys_lookup(struct inode *dir, struct dentry *dentry,
struct ctl_table_header *head = grab_header(dir);
struct ctl_table_header *h = NULL;
const struct qstr *name = &dentry->d_name;
struct ctl_table *p;
const struct ctl_table *p;
struct inode *inode;
struct dentry *err = ERR_PTR(-ENOENT);
struct ctl_dir *ctl_dir;
@ -550,7 +556,7 @@ static ssize_t proc_sys_call_handler(struct kiocb *iocb, struct iov_iter *iter,
{
struct inode *inode = file_inode(iocb->ki_filp);
struct ctl_table_header *head = grab_header(inode);
struct ctl_table *table = PROC_I(inode)->sysctl_entry;
const struct ctl_table *table = PROC_I(inode)->sysctl_entry;
size_t count = iov_iter_count(iter);
char *kbuf;
ssize_t error;
@ -624,7 +630,7 @@ static ssize_t proc_sys_write(struct kiocb *iocb, struct iov_iter *iter)
static int proc_sys_open(struct inode *inode, struct file *filp)
{
struct ctl_table_header *head = grab_header(inode);
struct ctl_table *table = PROC_I(inode)->sysctl_entry;
const struct ctl_table *table = PROC_I(inode)->sysctl_entry;
/* sysctl was unregistered */
if (IS_ERR(head))
@ -642,7 +648,7 @@ static __poll_t proc_sys_poll(struct file *filp, poll_table *wait)
{
struct inode *inode = file_inode(filp);
struct ctl_table_header *head = grab_header(inode);
struct ctl_table *table = PROC_I(inode)->sysctl_entry;
const struct ctl_table *table = PROC_I(inode)->sysctl_entry;
__poll_t ret = DEFAULT_POLLMASK;
unsigned long event;
@ -673,7 +679,7 @@ static __poll_t proc_sys_poll(struct file *filp, poll_table *wait)
static bool proc_sys_fill_cache(struct file *file,
struct dir_context *ctx,
struct ctl_table_header *head,
struct ctl_table *table)
const struct ctl_table *table)
{
struct dentry *child, *dir = file->f_path.dentry;
struct inode *inode;
@ -698,11 +704,11 @@ static bool proc_sys_fill_cache(struct file *file,
res = d_splice_alias(inode, child);
d_lookup_done(child);
if (unlikely(res)) {
if (IS_ERR(res)) {
dput(child);
return false;
}
dput(child);
if (IS_ERR(res))
return false;
child = res;
}
}
@ -717,7 +723,7 @@ static bool proc_sys_fill_cache(struct file *file,
static bool proc_sys_link_fill_cache(struct file *file,
struct dir_context *ctx,
struct ctl_table_header *head,
struct ctl_table *table)
const struct ctl_table *table)
{
bool ret = true;
@ -735,7 +741,7 @@ static bool proc_sys_link_fill_cache(struct file *file,
return ret;
}
static int scan(struct ctl_table_header *head, struct ctl_table *table,
static int scan(struct ctl_table_header *head, const struct ctl_table *table,
unsigned long *pos, struct file *file,
struct dir_context *ctx)
{
@ -759,7 +765,7 @@ static int proc_sys_readdir(struct file *file, struct dir_context *ctx)
{
struct ctl_table_header *head = grab_header(file_inode(file));
struct ctl_table_header *h = NULL;
struct ctl_table *entry;
const struct ctl_table *entry;
struct ctl_dir *ctl_dir;
unsigned long pos;
@ -792,7 +798,7 @@ static int proc_sys_permission(struct mnt_idmap *idmap,
* are _NOT_ writeable, capabilities or not.
*/
struct ctl_table_header *head;
struct ctl_table *table;
const struct ctl_table *table;
int error;
/* Executable files are not allowed under /proc/sys/ */
@ -836,7 +842,7 @@ static int proc_sys_getattr(struct mnt_idmap *idmap,
{
struct inode *inode = d_inode(path->dentry);
struct ctl_table_header *head = grab_header(inode);
struct ctl_table *table = PROC_I(inode)->sysctl_entry;
const struct ctl_table *table = PROC_I(inode)->sysctl_entry;
if (IS_ERR(head))
return PTR_ERR(head);
@ -935,7 +941,7 @@ static struct ctl_dir *find_subdir(struct ctl_dir *dir,
const char *name, int namelen)
{
struct ctl_table_header *head;
struct ctl_table *entry;
const struct ctl_table *entry;
entry = find_entry(&head, dir, name, namelen);
if (!entry)
@ -1046,12 +1052,12 @@ static struct ctl_dir *xlate_dir(struct ctl_table_set *set, struct ctl_dir *dir)
}
static int sysctl_follow_link(struct ctl_table_header **phead,
struct ctl_table **pentry)
const struct ctl_table **pentry)
{
struct ctl_table_header *head;
const struct ctl_table *entry;
struct ctl_table_root *root;
struct ctl_table_set *set;
struct ctl_table *entry;
struct ctl_dir *dir;
int ret;
@ -1078,7 +1084,7 @@ static int sysctl_follow_link(struct ctl_table_header **phead,
return ret;
}
static int sysctl_err(const char *path, struct ctl_table *table, char *fmt, ...)
static int sysctl_err(const char *path, const struct ctl_table *table, char *fmt, ...)
{
struct va_format vaf;
va_list args;
@ -1094,7 +1100,7 @@ static int sysctl_err(const char *path, struct ctl_table *table, char *fmt, ...)
return -EINVAL;
}
static int sysctl_check_table_array(const char *path, struct ctl_table *table)
static int sysctl_check_table_array(const char *path, const struct ctl_table *table)
{
unsigned int extra;
int err = 0;
@ -1133,7 +1139,7 @@ static int sysctl_check_table_array(const char *path, struct ctl_table *table)
static int sysctl_check_table(const char *path, struct ctl_table_header *header)
{
struct ctl_table *entry;
const struct ctl_table *entry;
int err = 0;
list_for_each_table_entry(entry, header) {
if (!entry->procname)
@ -1169,8 +1175,9 @@ static int sysctl_check_table(const char *path, struct ctl_table_header *header)
static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table_header *head)
{
struct ctl_table *link_table, *entry, *link;
struct ctl_table *link_table, *link;
struct ctl_table_header *links;
const struct ctl_table *entry;
struct ctl_node *node;
char *link_name;
int name_bytes;
@ -1215,7 +1222,7 @@ static bool get_links(struct ctl_dir *dir,
struct ctl_table_root *link_root)
{
struct ctl_table_header *tmp_head;
struct ctl_table *entry, *link;
const struct ctl_table *entry, *link;
if (header->ctl_table_size == 0 ||
sysctl_is_perm_empty_ctl_header(header))
@ -1358,7 +1365,7 @@ static struct ctl_dir *sysctl_mkdir_p(struct ctl_dir *dir, const char *path)
*/
struct ctl_table_header *__register_sysctl_table(
struct ctl_table_set *set,
const char *path, struct ctl_table *table, size_t table_size)
const char *path, const struct ctl_table *table, size_t table_size)
{
struct ctl_table_root *root = set->dir.header.root;
struct ctl_table_header *header;
@ -1419,7 +1426,7 @@ struct ctl_table_header *__register_sysctl_table(
*
* See __register_sysctl_table for more details.
*/
struct ctl_table_header *register_sysctl_sz(const char *path, struct ctl_table *table,
struct ctl_table_header *register_sysctl_sz(const char *path, const struct ctl_table *table,
size_t table_size)
{
return __register_sysctl_table(&sysctl_table_root.default_set,
@ -1448,7 +1455,7 @@ EXPORT_SYMBOL(register_sysctl_sz);
*
* Context: if your base directory does not exist it will be created for you.
*/
void __init __register_sysctl_init(const char *path, struct ctl_table *table,
void __init __register_sysctl_init(const char *path, const struct ctl_table *table,
const char *table_name, size_t table_size)
{
struct ctl_table_header *hdr = register_sysctl_sz(path, table, table_size);
@ -1466,7 +1473,7 @@ static void put_links(struct ctl_table_header *header)
struct ctl_table_root *root = header->root;
struct ctl_dir *parent = header->parent;
struct ctl_dir *core_parent;
struct ctl_table *entry;
const struct ctl_table *entry;
if (header->set == root_set)
return;
@ -1477,7 +1484,7 @@ static void put_links(struct ctl_table_header *header)
list_for_each_table_entry(entry, header) {
struct ctl_table_header *link_head;
struct ctl_table *link;
const struct ctl_table *link;
const char *name = entry->procname;
link = find_entry(&link_head, core_parent, name, strlen(name));

2
include/linux/bpf-cgroup.h
View file

@ -138,7 +138,7 @@ int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
short access, enum cgroup_bpf_attach_type atype);
int __cgroup_bpf_run_filter_sysctl(struct ctl_table_header *head,
struct ctl_table *table, int write,
const struct ctl_table *table, int write,
char **buf, size_t *pcount, loff_t *ppos,
enum cgroup_bpf_attach_type atype);

18
include/linux/sysctl.h
View file

@ -90,9 +90,7 @@ int proc_do_static_key(const struct ctl_table *table, int write, void *buffer,
/*
* Register a set of sysctl names by calling register_sysctl
* with an initialised array of struct ctl_table's. An entry with
* NULL procname terminates the table. table->de will be
* set up by the registration and need not be initialised in advance.
* with an initialised array of struct ctl_table's.
*
* sysctl names can be mirrored automatically under /proc/sys. The
* procname supplied controls /proc naming.
@ -133,7 +131,7 @@ static inline void *proc_sys_poll_event(struct ctl_table_poll *poll)
/* A sysctl table is an array of struct ctl_table: */
struct ctl_table {
const char *procname; /* Text ID for /proc/sys, or zero */
const char *procname; /* Text ID for /proc/sys */
void *data;
int maxlen;
umode_t mode;
@ -162,7 +160,7 @@ struct ctl_node {
struct ctl_table_header {
union {
struct {
struct ctl_table *ctl_table;
const struct ctl_table *ctl_table;
int ctl_table_size;
int used;
int count;
@ -223,13 +221,13 @@ extern void retire_sysctl_set(struct ctl_table_set *set);
struct ctl_table_header *__register_sysctl_table(
struct ctl_table_set *set,
const char *path, struct ctl_table *table, size_t table_size);
struct ctl_table_header *register_sysctl_sz(const char *path, struct ctl_table *table,
const char *path, const struct ctl_table *table, size_t table_size);
struct ctl_table_header *register_sysctl_sz(const char *path, const struct ctl_table *table,
size_t table_size);
void unregister_sysctl_table(struct ctl_table_header * table);
extern int sysctl_init_bases(void);
extern void __register_sysctl_init(const char *path, struct ctl_table *table,
extern void __register_sysctl_init(const char *path, const struct ctl_table *table,
const char *table_name, size_t table_size);
#define register_sysctl_init(path, table) \
__register_sysctl_init(path, table, #table, ARRAY_SIZE(table))
@ -251,7 +249,7 @@ extern int no_unaligned_warning;
#else /* CONFIG_SYSCTL */
static inline void register_sysctl_init(const char *path, struct ctl_table *table)
static inline void register_sysctl_init(const char *path, const struct ctl_table *table)
{
}
@ -261,7 +259,7 @@ static inline struct ctl_table_header *register_sysctl_mount_point(const char *p
}
static inline struct ctl_table_header *register_sysctl_sz(const char *path,
struct ctl_table *table,
const struct ctl_table *table,
size_t table_size)
{
return NULL;

2
kernel/bpf/cgroup.c
View file

@ -1708,7 +1708,7 @@ const struct bpf_verifier_ops cg_dev_verifier_ops = {
* returned value != 1 during execution. In all other cases 0 is returned.
*/
int __cgroup_bpf_run_filter_sysctl(struct ctl_table_header *head,
struct ctl_table *table, int write,
const struct ctl_table *table, int write,
char **buf, size_t *pcount, loff_t *ppos,
enum cgroup_bpf_attach_type atype)
{

1
kernel/sysctl.c
View file

@ -1305,7 +1305,6 @@ int proc_dointvec_userhz_jiffies(const struct ctl_table *table, int write,
* @write: %TRUE if this is a write to the sysctl file
* @buffer: the user buffer
* @lenp: the size of the user buffer
* @ppos: file position
* @ppos: the current position in the file
*
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer

2
kernel/ucount.c
View file

@ -70,7 +70,7 @@ static long ue_int_max = INT_MAX;
.extra1 = &ue_zero, \
.extra2 = &ue_int_max, \
}
static struct ctl_table user_table[] = {
static const struct ctl_table user_table[] = {
UCOUNT_ENTRY("max_user_namespaces"),
UCOUNT_ENTRY("max_pid_namespaces"),
UCOUNT_ENTRY("max_uts_namespaces"),

1
scripts/const_structs.checkpatch
View file

@ -6,6 +6,7 @@ bus_type
clk_ops
comedi_lrange
component_ops
ctl_table
dentry_operations
dev_pm_ops
device_type