diff options
| author | Luis Chamberlain <mcgrof@kernel.org> | 2021-11-17 15:42:41 -0800 |
|---|---|---|
| committer | Luis Chamberlain <mcgrof@kernel.org> | 2021-11-23 09:05:25 -0800 |
| commit | 06d33569add5d71725a727d8da80ce480b06fdec (patch) | |
| tree | 83c49c84e574b99ecd62ced15ff8c93ae6df3367 | |
| parent | 8c930a67012041a7026c90bf9707bd7c41831cc7 (diff) | |
| download | linux-next-06d33569add5d71725a727d8da80ce480b06fdec.tar.gz | |
sysctl: add helper to register a sysctl mount point
The way to create a subdirectory on top of sysctl_mount_point is
a bit obscure, and *why* we do that even so more. Provide a helper
which makes it clear why we do this.
Suggested-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
| -rw-r--r-- | fs/proc/proc_sysctl.c | 13 | ||||
| -rw-r--r-- | include/linux/sysctl.h | 7 |
2 files changed, 20 insertions, 0 deletions
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c index 6d462644bb003..aa743bbb84007 100644 --- a/fs/proc/proc_sysctl.c +++ b/fs/proc/proc_sysctl.c @@ -35,6 +35,19 @@ struct ctl_table sysctl_mount_point[] = { { } }; +/** + * register_sysctl_mount_point() - registers a sysctl mount point + * @path: path for the mount point + * + * Used to create a permanently empty directory to serve as mount point. + * There are some subtle but important permission checks this allows in the + * case of unprivileged mounts. + */ +struct ctl_table_header *register_sysctl_mount_point(const char *path) +{ + return register_sysctl(path, sysctl_mount_point); +} + static bool is_empty_dir(struct ctl_table_header *head) { return head->ctl_table[0].child == sysctl_mount_point; diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h index e4da44567f184..2cf36e53ec284 100644 --- a/include/linux/sysctl.h +++ b/include/linux/sysctl.h @@ -208,6 +208,8 @@ extern int sysctl_init(void); extern void __register_sysctl_init(const char *path, struct ctl_table *table, const char *table_name); #define register_sysctl_init(path, table) __register_sysctl_init(path, table, #table) +extern struct ctl_table_header *register_sysctl_mount_point(const char *path); + void do_sysctl_args(void); extern int pwrsw_enabled; @@ -223,6 +225,11 @@ static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * return NULL; } +static struct sysctl_header *register_sysctl_mount_point(const char *path) +{ + return NULL +} + static inline struct ctl_table_header *register_sysctl_paths( const struct ctl_path *path, struct ctl_table *table) { |