diff options
| -rw-r--r-- | fs/proc/inode.c | 10 | ||||
| -rw-r--r-- | fs/proc/internal.h | 1 | ||||
| -rw-r--r-- | fs/proc/root.c | 55 |
3 files changed, 64 insertions, 2 deletions
diff --git a/fs/proc/inode.c b/fs/proc/inode.c index 51a176622b8fda..27c762f34870a2 100644 --- a/fs/proc/inode.c +++ b/fs/proc/inode.c @@ -7,6 +7,7 @@ #include <linux/time.h> #include <linux/proc_fs.h> #include <linux/kernel.h> +#include <linux/pid_namespace.h> #include <linux/mm.h> #include <linux/string.h> #include <linux/stat.h> @@ -17,7 +18,9 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/sysctl.h> +#include <linux/seq_file.h> #include <linux/slab.h> +#include <linux/mount.h> #include <asm/system.h> #include <asm/uaccess.h> @@ -101,12 +104,19 @@ void __init proc_init_inodecache(void) init_once); } +static int proc_show_options(struct seq_file *seq, struct dentry *root) +{ + return 0; +} + static const struct super_operations proc_sops = { .alloc_inode = proc_alloc_inode, .destroy_inode = proc_destroy_inode, .drop_inode = generic_delete_inode, .evict_inode = proc_evict_inode, .statfs = simple_statfs, + .remount_fs = proc_remount, + .show_options = proc_show_options, }; static void __pde_users_dec(struct proc_dir_entry *pde) diff --git a/fs/proc/internal.h b/fs/proc/internal.h index 7838e5cfec145d..292577531ad13e 100644 --- a/fs/proc/internal.h +++ b/fs/proc/internal.h @@ -117,6 +117,7 @@ void pde_put(struct proc_dir_entry *pde); int proc_fill_super(struct super_block *); struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); +int proc_remount(struct super_block *sb, int *flags, char *data); /* * These are generic /proc routines that use the internal diff --git a/fs/proc/root.c b/fs/proc/root.c index 03102d978180eb..6a8ac1d361a923 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -18,6 +18,7 @@ #include <linux/bitops.h> #include <linux/mount.h> #include <linux/pid_namespace.h> +#include <linux/parser.h> #include "internal.h" @@ -36,6 +37,48 @@ static int proc_set_super(struct super_block *sb, void *data) return err; } +enum { + Opt_err, +}; + +static const match_table_t tokens = { + {Opt_err, NULL}, +}; + +static int proc_parse_options(char *options, struct pid_namespace *pid) +{ + char *p; + substring_t args[MAX_OPT_ARGS]; + + pr_debug("proc: options = %s\n", options); + + if (!options) + return 1; + + while ((p = strsep(&options, ",")) != NULL) { + int token; + if (!*p) + continue; + + args[0].to = args[0].from = 0; + token = match_token(p, tokens, args); + switch (token) { + default: + pr_err("proc: unrecognized mount option \"%s\" " + "or missing value\n", p); + return 0; + } + } + + return 1; +} + +int proc_remount(struct super_block *sb, int *flags, char *data) +{ + struct pid_namespace *pid = sb->s_fs_info; + return !proc_parse_options(data, pid); +} + static struct dentry *proc_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { @@ -43,11 +86,15 @@ static struct dentry *proc_mount(struct file_system_type *fs_type, struct super_block *sb; struct pid_namespace *ns; struct proc_inode *ei; + char *options; - if (flags & MS_KERNMOUNT) + if (flags & MS_KERNMOUNT) { ns = (struct pid_namespace *)data; - else + options = NULL; + } else { ns = current->nsproxy->pid_ns; + options = data; + } sb = sget(fs_type, proc_test_super, proc_set_super, ns); if (IS_ERR(sb)) @@ -55,6 +102,10 @@ static struct dentry *proc_mount(struct file_system_type *fs_type, if (!sb->s_root) { sb->s_flags = flags; + if (!proc_parse_options(options, ns)) { + deactivate_locked_super(sb); + return ERR_PTR(-EINVAL); + } err = proc_fill_super(sb); if (err) { deactivate_locked_super(sb); |