diff options
36 files changed, 416 insertions, 430 deletions
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c index dc063fe..5f4243f 100644 --- a/arch/ia64/kernel/perfmon.c +++ b/arch/ia64/kernel/perfmon.c @@ -2145,22 +2145,12 @@ doit: return 0; } -static int -pfm_no_open(struct inode *irrelevant, struct file *dontcare) -{ - DPRINT(("pfm_no_open called\n")); - return -ENXIO; -} - - - static const struct file_operations pfm_file_ops = { .llseek = no_llseek, .read = pfm_read, .write = pfm_write, .poll = pfm_poll, .unlocked_ioctl = pfm_ioctl, - .open = pfm_no_open, /* special open code to disallow open via /proc */ .fasync = pfm_fasync, .release = pfm_close, .flush = pfm_flush diff --git a/fs/Makefile b/fs/Makefile index da0bbb4..bedff48 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -11,7 +11,7 @@ obj-y := open.o read_write.o file_table.o super.o \ attr.o bad_inode.o file.o filesystems.o namespace.o \ seq_file.o xattr.o libfs.o fs-writeback.o \ pnode.o splice.o sync.o utimes.o \ - stack.o fs_struct.o statfs.o fs_pin.o + stack.o fs_struct.o statfs.o fs_pin.o nsfs.o ifeq ($(CONFIG_BLOCK),y) obj-y += buffer.o block_dev.o direct-io.o mpage.o diff --git a/fs/coda/dir.c b/fs/coda/dir.c index 7ff0259..86c8938 100644 --- a/fs/coda/dir.c +++ b/fs/coda/dir.c @@ -426,7 +426,6 @@ static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx) struct coda_file_info *cfi; struct coda_inode_info *cii; struct file *host_file; - struct dentry *de; struct venus_dirent *vdir; unsigned long vdir_size = offsetof(struct venus_dirent, d_name); unsigned int type; @@ -438,8 +437,7 @@ static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx) BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); host_file = cfi->cfi_container; - de = coda_file->f_path.dentry; - cii = ITOC(de->d_inode); + cii = ITOC(file_inode(coda_file)); vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); if (!vdir) return -ENOMEM; @@ -114,6 +114,11 @@ int proc_nr_inodes(struct ctl_table *table, int write, } #endif +static int no_open(struct inode *inode, struct file *file) +{ + return -ENXIO; +} + /** * inode_init_always - perform inode structure intialisation * @sb: superblock inode belongs to @@ -125,7 +130,7 @@ int proc_nr_inodes(struct ctl_table *table, int write, int inode_init_always(struct super_block *sb, struct inode *inode) { static const struct inode_operations empty_iops; - static const struct file_operations empty_fops; + static const struct file_operations no_open_fops = {.open = no_open}; struct address_space *const mapping = &inode->i_data; inode->i_sb = sb; @@ -133,7 +138,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode) inode->i_flags = 0; atomic_set(&inode->i_count, 1); inode->i_op = &empty_iops; - inode->i_fop = &empty_fops; + inode->i_fop = &no_open_fops; inode->__i_nlink = 1; inode->i_opflags = 0; i_uid_write(inode, 0); @@ -1798,7 +1803,7 @@ void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev) } else if (S_ISFIFO(mode)) inode->i_fop = &pipefifo_fops; else if (S_ISSOCK(mode)) - inode->i_fop = &bad_sock_fops; + ; /* leave it no_open_fops */ else printk(KERN_DEBUG "init_special_inode: bogus i_mode (%o) for" " inode %s:%lu\n", mode, inode->i_sb->s_id, diff --git a/fs/internal.h b/fs/internal.h index 757ba2a..e9a61fe 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -147,3 +147,8 @@ extern const struct file_operations pipefifo_fops; */ extern void sb_pin_kill(struct super_block *sb); extern void mnt_pin_kill(struct mount *m); + +/* + * fs/nsfs.c + */ +extern struct dentry_operations ns_dentry_operations; @@ -1,10 +1,11 @@ #include <linux/mount.h> #include <linux/seq_file.h> #include <linux/poll.h> +#include <linux/ns_common.h> struct mnt_namespace { atomic_t count; - unsigned int proc_inum; + struct ns_common ns; struct mount * root; struct list_head list; struct user_namespace *user_ns; @@ -487,6 +487,19 @@ void path_put(const struct path *path) } EXPORT_SYMBOL(path_put); +struct nameidata { + struct path path; + struct qstr last; + struct path root; + struct inode *inode; /* path.dentry.d_inode */ + unsigned int flags; + unsigned seq, m_seq; + int last_type; + unsigned depth; + struct file *base; + char *saved_names[MAX_NESTED_LINKS + 1]; +}; + /* * Path walking has 2 modes, rcu-walk and ref-walk (see * Documentation/filesystems/path-lookup.txt). In situations when we can't @@ -695,6 +708,18 @@ void nd_jump_link(struct nameidata *nd, struct path *path) nd->flags |= LOOKUP_JUMPED; } +void nd_set_link(struct nameidata *nd, char *path) +{ + nd->saved_names[nd->depth] = path; +} +EXPORT_SYMBOL(nd_set_link); + +char *nd_get_link(struct nameidata *nd) +{ + return nd->saved_names[nd->depth]; +} +EXPORT_SYMBOL(nd_get_link); + static inline void put_link(struct nameidata *nd, struct path *link, void *cookie) { struct inode *inode = link->dentry->d_inode; @@ -1821,13 +1846,14 @@ static int link_path_walk(const char *name, struct nameidata *nd) } static int path_init(int dfd, const char *name, unsigned int flags, - struct nameidata *nd, struct file **fp) + struct nameidata *nd) { int retval = 0; nd->last_type = LAST_ROOT; /* if there are only slashes... */ - nd->flags = flags | LOOKUP_JUMPED; + nd->flags = flags | LOOKUP_JUMPED | LOOKUP_PARENT; nd->depth = 0; + nd->base = NULL; if (flags & LOOKUP_ROOT) { struct dentry *root = nd->root.dentry; struct inode *inode = root->d_inode; @@ -1847,7 +1873,7 @@ static int path_init(int dfd, const char *name, unsigned int flags, } else { path_get(&nd->path); } - return 0; + goto done; } nd->root.mnt = NULL; @@ -1897,7 +1923,7 @@ static int path_init(int dfd, const char *name, unsigned int flags, nd->path = f.file->f_path; if (flags & LOOKUP_RCU) { if (f.flags & FDPUT_FPUT) - *fp = f.file; + nd->base = f.file; nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq); rcu_read_lock(); } else { @@ -1908,13 +1934,26 @@ static int path_init(int dfd, const char *name, unsigned int flags, nd->inode = nd->path.dentry->d_inode; if (!(flags & LOOKUP_RCU)) - return 0; + goto done; if (likely(!read_seqcount_retry(&nd->path.dentry->d_seq, nd->seq))) - return 0; + goto done; if (!(nd->flags & LOOKUP_ROOT)) nd->root.mnt = NULL; rcu_read_unlock(); return -ECHILD; +done: + current->total_link_count = 0; + return link_path_walk(name, nd); +} + +static void path_cleanup(struct nameidata *nd) +{ + if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) { + path_put(&nd->root); + nd->root.mnt = NULL; + } + if (unlikely(nd->base)) + fput(nd->base); } static inline int lookup_last(struct nameidata *nd, struct path *path) @@ -1930,7 +1969,6 @@ static inline int lookup_last(struct nameidata *nd, struct path *path) static int path_lookupat(int dfd, const char *name, unsigned int flags, struct nameidata *nd) { - struct file *base = NULL; struct path path; int err; @@ -1948,14 +1986,7 @@ static int path_lookupat(int dfd, const char *name, * be handled by restarting a traditional ref-walk (which will always * be able to complete). */ - err = path_init(dfd, name, flags | LOOKUP_PARENT, nd, &base); - - if (unlikely(err)) - goto out; - - current->total_link_count = 0; - err = link_path_walk(name, nd); - + err = path_init(dfd, name, flags, nd); if (!err && !(flags & LOOKUP_PARENT)) { err = lookup_last(nd, &path); while (err > 0) { @@ -1983,14 +2014,7 @@ static int path_lookupat(int dfd, const char *name, } } -out: - if (base) - fput(base); - - if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) { - path_put(&nd->root); - nd->root.mnt = NULL; - } + path_cleanup(nd); return err; } @@ -2297,19 +2321,13 @@ out: static int path_mountpoint(int dfd, const char *name, struct path *path, unsigned int flags) { - struct file *base = NULL; struct nameidata nd; int err; - err = path_init(dfd, name, flags | LOOKUP_PARENT, &nd, &base); + err = path_init(dfd, name, flags, &nd); if (unlikely(err)) goto out; - current->total_link_count = 0; - err = link_path_walk(name, &nd); - if (err) - goto out; - err = mountpoint_last(&nd, path); while (err > 0) { void *cookie; @@ -2325,12 +2343,7 @@ path_mountpoint(int dfd, const char *name, struct path *path, unsigned int flags put_link(&nd, &link, cookie); } out: - if (base) - fput(base); - - if (nd.root.mnt && !(nd.flags & LOOKUP_ROOT)) - path_put(&nd.root); - + path_cleanup(&nd); return err; } @@ -3181,7 +3194,6 @@ out: static struct file *path_openat(int dfd, struct filename *pathname, struct nameidata *nd, const struct open_flags *op, int flags) { - struct file *base = NULL; struct file *file; struct path path; int opened = 0; @@ -3198,12 +3210,7 @@ static struct file *path_openat(int dfd, struct filename *pathname, goto out; } - error = path_init(dfd, pathname->name, flags | LOOKUP_PARENT, nd, &base); - if (unlikely(error)) - goto out; - - current->total_link_count = 0; - error = link_path_walk(pathname->name, nd); + error = path_init(dfd, pathname->name, flags, nd); if (unlikely(error)) goto out; @@ -3229,10 +3236,7 @@ static struct file *path_openat(int dfd, struct filename *pathname, put_link(nd, &link, cookie); } out: - if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) - path_put(&nd->root); - if (base) - fput(base); + path_cleanup(nd); if (!(opened & FILE_OPENED)) { BUG_ON(!error); put_filp(file); diff --git a/fs/namespace.c b/fs/namespace.c index 5b66b2b..30df6e7 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1569,17 +1569,13 @@ SYSCALL_DEFINE1(oldumount, char __user *, name) static bool is_mnt_ns_file(struct dentry *dentry) { /* Is this a proxy for a mount namespace? */ - struct inode *inode = dentry->d_inode; - struct proc_ns *ei; - - if (!proc_ns_inode(inode)) - return false; - - ei = get_proc_ns(inode); - if (ei->ns_ops != &mntns_operations) - return false; + return dentry->d_op == &ns_dentry_operations && + dentry->d_fsdata == &mntns_operations; +} - return true; +struct mnt_namespace *to_mnt_ns(struct ns_common *ns) +{ + return container_of(ns, struct mnt_namespace, ns); } static bool mnt_ns_loop(struct dentry *dentry) @@ -1591,7 +1587,7 @@ static bool mnt_ns_loop(struct dentry *dentry) if (!is_mnt_ns_file(dentry)) return false; - mnt_ns = get_proc_ns(dentry->d_inode)->ns; + mnt_ns = to_mnt_ns(get_proc_ns(dentry->d_inode)); return current->nsproxy->mnt_ns->seq >= mnt_ns->seq; } @@ -2020,7 +2016,10 @@ static int do_loopback(struct path *path, const char *old_name, if (IS_MNT_UNBINDABLE(old)) goto out2; - if (!check_mnt(parent) || !check_mnt(old)) + if (!check_mnt(parent)) + goto out2; + + if (!check_mnt(old) && old_path.dentry->d_op != &ns_dentry_operations) goto out2; if (!recurse && has_locked_children(old, old_path.dentry)) @@ -2640,7 +2639,7 @@ dput_out: static void free_mnt_ns(struct mnt_namespace *ns) { - proc_free_inum(ns->proc_inum); + ns_free_inum(&ns->ns); put_user_ns(ns->user_ns); kfree(ns); } @@ -2662,11 +2661,12 @@ static struct mnt_namespace *alloc_mnt_ns(struct user_namespace *user_ns) new_ns = kmalloc(sizeof(struct mnt_namespace), GFP_KERNEL); if (!new_ns) return ERR_PTR(-ENOMEM); - ret = proc_alloc_inum(&new_ns->proc_inum); + ret = ns_alloc_inum(&new_ns->ns); if (ret) { kfree(new_ns); return ERR_PTR(ret); } + new_ns->ns.ops = &mntns_operations; new_ns->seq = atomic64_add_return(1, &mnt_ns_seq); atomic_set(&new_ns->count, 1); new_ns->root = NULL; @@ -3144,31 +3144,31 @@ found: return visible; } -static void *mntns_get(struct task_struct *task) +static struct ns_common *mntns_get(struct task_struct *task) { - struct mnt_namespace *ns = NULL; + struct ns_common *ns = NULL; struct nsproxy *nsproxy; task_lock(task); nsproxy = task->nsproxy; if (nsproxy) { - ns = nsproxy->mnt_ns; - get_mnt_ns(ns); + ns = &nsproxy->mnt_ns->ns; + get_mnt_ns(to_mnt_ns(ns)); } task_unlock(task); return ns; } -static void mntns_put(void *ns) +static void mntns_put(struct ns_common *ns) { - put_mnt_ns(ns); + put_mnt_ns(to_mnt_ns(ns)); } -static int mntns_install(struct nsproxy *nsproxy, void *ns) +static int mntns_install(struct nsproxy *nsproxy, struct ns_common *ns) { struct fs_struct *fs = current->fs; - struct mnt_namespace *mnt_ns = ns; + struct mnt_namespace *mnt_ns = to_mnt_ns(ns); struct path root; if (!ns_capable(mnt_ns->user_ns, CAP_SYS_ADMIN) || @@ -3198,17 +3198,10 @@ static int mntns_install(struct nsproxy *nsproxy, void *ns) return 0; } -static unsigned int mntns_inum(void *ns) -{ - struct mnt_namespace *mnt_ns = ns; - return mnt_ns->proc_inum; -} - const struct proc_ns_operations mntns_operations = { .name = "mnt", .type = CLONE_NEWNS, .get = mntns_get, .put = mntns_put, .install = mntns_install, - .inum = mntns_inum, }; diff --git a/fs/nsfs.c b/fs/nsfs.c new file mode 100644 index 0000000..af1b24f --- /dev/null +++ b/fs/nsfs.c @@ -0,0 +1,161 @@ +#include <linux/mount.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/proc_ns.h> +#include <linux/magic.h> +#include <linux/ktime.h> + +static struct vfsmount *nsfs_mnt; + +static const struct file_operations ns_file_operations = { + .llseek = no_llseek, +}; + +static char *ns_dname(struct dentry *dentry, char *buffer, int buflen) +{ + struct inode *inode = dentry->d_inode; + const struct proc_ns_operations *ns_ops = dentry->d_fsdata; + + return dynamic_dname(dentry, buffer, buflen, "%s:[%lu]", + ns_ops->name, inode->i_ino); +} + +static void ns_prune_dentry(struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + if (inode) { + struct ns_common *ns = inode->i_private; + atomic_long_set(&ns->stashed, 0); + } +} + +const struct dentry_operations ns_dentry_operations = +{ + .d_prune = ns_prune_dentry, + .d_delete = always_delete_dentry, + .d_dname = ns_dname, +}; + +static void nsfs_evict(struct inode *inode) +{ + struct ns_common *ns = inode->i_private; + clear_inode(inode); + ns->ops->put(ns); +} + +void *ns_get_path(struct path *path, struct task_struct *task, + const struct proc_ns_operations *ns_ops) +{ + struct vfsmount *mnt = mntget(nsfs_mnt); + struct qstr qname = { .name = "", }; + struct dentry *dentry; + struct inode *inode; + struct ns_common *ns; + unsigned long d; + +again: + ns = ns_ops->get(task); + if (!ns) { + mntput(mnt); + return ERR_PTR(-ENOENT); + } + rcu_read_lock(); + d = atomic_long_read(&ns->stashed); + if (!d) + goto slow; + dentry = (struct dentry *)d; + if (!lockref_get_not_dead(&dentry->d_lockref)) + goto slow; + rcu_read_unlock(); + ns_ops->put(ns); +got_it: + path->mnt = mnt; + path->dentry = dentry; + return NULL; +slow: + rcu_read_unlock(); + inode = new_inode_pseudo(mnt->mnt_sb); + if (!inode) { + ns_ops->put(ns); + mntput(mnt); + return ERR_PTR(-ENOMEM); + } + inode->i_ino = ns->inum; + inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; + inode->i_flags |= S_IMMUTABLE; + inode->i_mode = S_IFREG | S_IRUGO; + inode->i_fop = &ns_file_operations; + inode->i_private = ns; + + dentry = d_alloc_pseudo(mnt->mnt_sb, &qname); + if (!dentry) { + iput(inode); + mntput(mnt); + return ERR_PTR(-ENOMEM); + } + d_instantiate(dentry, inode); + dentry->d_fsdata = (void *)ns_ops; + d = atomic_long_cmpxchg(&ns->stashed, 0, (unsigned long)dentry); + if (d) { + d_delete(dentry); /* make sure ->d_prune() does nothing */ + dput(dentry); + cpu_relax(); + goto again; + } + goto got_it; +} + +int ns_get_name(char *buf, size_t size, struct task_struct *task, + const struct proc_ns_operations *ns_ops) +{ + struct ns_common *ns; + int res = -ENOENT; + ns = ns_ops->get(task); + if (ns) { + res = snprintf(buf, size, "%s:[%u]", ns_ops->name, ns->inum); + ns_ops->put(ns); + } + return res; +} + +struct file *proc_ns_fget(int fd) +{ + struct file *file; + + file = fget(fd); + if (!file) + return ERR_PTR(-EBADF); + + if (file->f_op != &ns_file_operations) + goto out_invalid; + + return file; + +out_invalid: + fput(file); + return ERR_PTR(-EINVAL); +} + +static const struct super_operations nsfs_ops = { + .statfs = simple_statfs, + .evict_inode = nsfs_evict, +}; +static struct dentry *nsfs_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return mount_pseudo(fs_type, "nsfs:", &nsfs_ops, + &ns_dentry_operations, NSFS_MAGIC); +} +static struct file_system_type nsfs = { + .name = "nsfs", + .mount = nsfs_mount, + .kill_sb = kill_anon_super, +}; + +void __init nsfs_init(void) +{ + nsfs_mnt = kern_mount(&nsfs); + if (IS_ERR(nsfs_mnt)) + panic("can't set nsfs up\n"); + nsfs_mnt->mnt_sb->s_flags &= ~MS_NOUSER; +} diff --git a/fs/proc/inode.c b/fs/proc/inode.c index 333080d..8420a2f 100644 --- a/fs/proc/inode.c +++ b/fs/proc/inode.c @@ -32,8 +32,6 @@ static void proc_evict_inode(struct inode *inode) { struct proc_dir_entry *de; struct ctl_table_header *head; - const struct proc_ns_operations *ns_ops; - void *ns; truncate_inode_pages_final(&inode->i_data); clear_inode(inode); @@ -50,11 +48,6 @@ static void proc_evict_inode(struct inode *inode) RCU_INIT_POINTER(PROC_I(inode)->sysctl, NULL); sysctl_head_put(head); } - /* Release any associated namespace */ - ns_ops = PROC_I(inode)->ns.ns_ops; - ns = PROC_I(inode)->ns.ns; - if (ns_ops && ns) - ns_ops->put(ns); } static struct kmem_cache * proc_inode_cachep; @@ -73,8 +66,7 @@ static struct inode *proc_alloc_inode(struct super_block *sb) ei->pde = NULL; ei->sysctl = NULL; ei->sysctl_entry = NULL; - ei->ns.ns = NULL; - ei->ns.ns_ops = NULL; + ei->ns_ops = NULL; inode = &ei->vfs_inode; inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; return inode; diff --git a/fs/proc/internal.h b/fs/proc/internal.h index 7fb1a48..6fcdba5 100644 --- a/fs/proc/internal.h +++ b/fs/proc/internal.h @@ -65,7 +65,7 @@ struct proc_inode { struct proc_dir_entry *pde; struct ctl_table_header *sysctl; struct ctl_table *sysctl_entry; - struct proc_ns ns; + const struct proc_ns_operations *ns_ops; struct inode vfs_inode; }; diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c index 8902609..c9eac45 100644 --- a/fs/proc/namespaces.c +++ b/fs/proc/namespaces.c @@ -1,10 +1,6 @@ #include <linux/proc_fs.h> #include <linux/nsproxy.h> -#include <linux/sched.h> #include <linux/ptrace.h> -#include <linux/fs_struct.h> -#include <linux/mount.h> -#include <linux/path.h> #include <linux/namei.h> #include <linux/file.h> #include <linux/utsname.h> @@ -34,138 +30,45 @@ static const struct proc_ns_operations *ns_entries[] = { &mntns_operations, }; -static const struct file_operations ns_file_operations = { - .llseek = no_llseek, -}; - -static const struct inode_operations ns_inode_operations = { - .setattr = proc_setattr, -}; - -static char *ns_dname(struct dentry *dentry, char *buffer, int buflen) -{ - struct inode *inode = dentry->d_inode; - const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns.ns_ops; - - return dynamic_dname(dentry, buffer, buflen, "%s:[%lu]", - ns_ops->name, inode->i_ino); -} - -const struct dentry_operations ns_dentry_operations = -{ - .d_delete = always_delete_dentry, - .d_dname = ns_dname, -}; - -static struct dentry *proc_ns_get_dentry(struct super_block *sb, - struct task_struct *task, const struct proc_ns_operations *ns_ops) -{ - struct dentry *dentry, *result; - struct inode *inode; - struct proc_inode *ei; - struct qstr qname = { .name = "", }; - void *ns; - - ns = ns_ops->get(task); - if (!ns) - return ERR_PTR(-ENOENT); - - dentry = d_alloc_pseudo(sb, &qname); - if (!dentry) { - ns_ops->put(ns); - return ERR_PTR(-ENOMEM); - } - - inode = iget_locked(sb, ns_ops->inum(ns)); - if (!inode) { - dput(dentry); - ns_ops->put(ns); - return ERR_PTR(-ENOMEM); - } - - ei = PROC_I(inode); - if (inode->i_state & I_NEW) { - inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; - inode->i_op = &ns_inode_operations; - inode->i_mode = S_IFREG | S_IRUGO; - inode->i_fop = &ns_file_operations; - ei->ns.ns_ops = ns_ops; - ei->ns.ns = ns; - unlock_new_inode(inode); - } else { - ns_ops->put(ns); - } - - d_set_d_op(dentry, &ns_dentry_operations); - result = d_instantiate_unique(dentry, inode); - if (result) { - dput(dentry); - dentry = result; - } - - return dentry; -} - static void *proc_ns_follow_link(struct dentry *dentry, struct nameidata *nd) { struct inode *inode = dentry->d_inode; - struct super_block *sb = inode->i_sb; - struct proc_inode *ei = PROC_I(inode); + const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops; struct task_struct *task; struct path ns_path; void *error = ERR_PTR(-EACCES); task = get_proc_task(inode); if (!task) - goto out; + return error; - if (!ptrace_may_access(task, PTRACE_MODE_READ)) - goto out_put_task; - - ns_path.dentry = proc_ns_get_dentry(sb, task, ei->ns.ns_ops); - if (IS_ERR(ns_path.dentry)) { - error = ERR_CAST(ns_path.dentry); - goto out_put_task; + if (ptrace_may_access(task, PTRACE_MODE_READ)) { + error = ns_get_path(&ns_path, task, ns_ops); + if (!error) + nd_jump_link(nd, &ns_path); } - - ns_path.mnt = mntget(nd->path.mnt); - nd_jump_link(nd, &ns_path); - error = NULL; - -out_put_task: put_task_struct(task); -out: return error; } static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int buflen) { struct inode *inode = dentry->d_inode; - struct proc_inode *ei = PROC_I(inode); - const struct proc_ns_operations *ns_ops = ei->ns.ns_ops; + const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops; struct task_struct *task; - void *ns; char name[50]; int res = -EACCES; task = get_proc_task(inode); if (!task) - goto out; - - if (!ptrace_may_access(task, PTRACE_MODE_READ)) - goto out_put_task; + return res; - res = -ENOENT; - ns = ns_ops->get(task); - if (!ns) - goto out_put_task; - - snprintf(name, sizeof(name), "%s:[%u]", ns_ops->name, ns_ops->inum(ns)); - res = readlink_copy(buffer, buflen, name); - ns_ops->put(ns); -out_put_task: + if (ptrace_may_access(task, PTRACE_MODE_READ)) { + res = ns_get_name(name, sizeof(name), task, ns_ops); + if (res >= 0) + res = readlink_copy(buffer, buflen, name); + } put_task_struct(task); -out: return res; } @@ -189,7 +92,7 @@ static int proc_ns_instantiate(struct inode *dir, ei = PROC_I(inode); inode->i_mode = S_IFLNK|S_IRWXUGO; inode->i_op = &proc_ns_link_inode_operations; - ei->ns.ns_ops = ns_ops; + ei->ns_ops = ns_ops; d_set_d_op(dentry, &pid_dentry_operations); d_add(dentry, inode); @@ -267,31 +170,3 @@ const struct inode_operations proc_ns_dir_inode_operations = { .getattr = pid_getattr, .setattr = proc_setattr, }; - -struct file *proc_ns_fget(int fd) -{ - struct file *file; - - file = fget(fd); - if (!file) - return ERR_PTR(-EBADF); - - if (file->f_op != &ns_file_operations) - goto out_invalid; - - return file; - -out_invalid: - fput(file); - return ERR_PTR(-EINVAL); -} - -struct proc_ns *get_proc_ns(struct inode *inode) -{ - return &PROC_I(inode)->ns; -} - -bool proc_ns_inode(struct inode *inode) -{ - return inode->i_fop == &ns_file_operations; -} diff --git a/include/linux/fs.h b/include/linux/fs.h index eeaccd3..f90c028 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2176,7 +2176,6 @@ static inline int sb_is_blkdev_sb(struct super_block *sb) extern int sync_filesystem(struct super_block *); extern const struct file_operations def_blk_fops; extern const struct file_operations def_chr_fops; -extern const struct file_operations bad_sock_fops; #ifdef CONFIG_BLOCK extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h index e365d5e..1eee6bc 100644 --- a/include/linux/ipc_namespace.h +++ b/include/linux/ipc_namespace.h @@ -6,6 +6,7 @@ #include <linux/rwsem.h> #include <linux/notifier.h> #include <linux/nsproxy.h> +#include <linux/ns_common.h> struct user_namespace; @@ -58,7 +59,7 @@ struct ipc_namespace { /* user_ns which owns the ipc ns */ struct user_namespace *user_ns; - unsigned int proc_inum; + struct ns_common ns; }; extern struct ipc_namespace init_ipc_ns; diff --git a/include/linux/namei.h b/include/linux/namei.h index 492de72..c899077 100644 --- a/include/linux/namei.h +++ b/include/linux/namei.h @@ -7,21 +7,10 @@ #include <linux/path.h> struct vfsmount; +struct nameidata; enum { MAX_NESTED_LINKS = 8 }; -struct nameidata { - struct path path; - struct qstr last; - struct path root; - struct inode *inode; /* path.dentry.d_inode */ - unsigned int flags; - unsigned seq, m_seq; - int last_type; - unsigned depth; - char *saved_names[MAX_NESTED_LINKS + 1]; -}; - /* * Type of the last component on LOOKUP_PARENT */ @@ -82,16 +71,8 @@ extern struct dentry *lock_rename(struct dentry *, struct dentry *); extern void unlock_rename(struct dentry *, struct dentry *); extern void nd_jump_link(struct nameidata *nd, struct path *path); - -static inline void nd_set_link(struct nameidata *nd, char *path) -{ - nd->saved_names[nd->depth] = path; -} - -static inline char *nd_get_link(struct nameidata *nd) -{ - return nd->saved_names[nd->depth]; -} +extern void nd_set_link(struct nameidata *nd, char *path); +extern char *nd_get_link(struct nameidata *nd); static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) { diff --git a/include/linux/ns_common.h b/include/linux/ns_common.h new file mode 100644 index 0000000..85a5c8c --- /dev/null +++ b/include/linux/ns_common.h @@ -0,0 +1,12 @@ +#ifndef _LINUX_NS_COMMON_H +#define _LINUX_NS_COMMON_H + +struct proc_ns_operations; + +struct ns_common { + atomic_long_t stashed; + const struct proc_ns_operations *ops; + unsigned int inum; +}; + +#endif diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h index 1997ffc..b9cf6c5 100644 --- a/include/linux/pid_namespace.h +++ b/include/linux/pid_namespace.h @@ -8,6 +8,7 @@ #include <linux/threads.h> #include <linux/nsproxy.h> #include <linux/kref.h> +#include <linux/ns_common.h> struct pidmap { atomic_t nr_free; @@ -43,7 +44,7 @@ struct pid_namespace { kgid_t pid_gid; int hide_pid; int reboot; /* group exit code if this pidns was rebooted */ - unsigned int proc_inum; + struct ns_common ns; }; extern struct pid_namespace init_pid_ns; diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h index 34a1e10..42dfc61 100644 --- a/include/linux/proc_ns.h +++ b/include/linux/proc_ns.h @@ -4,21 +4,18 @@ #ifndef _LINUX_PROC_NS_H #define _LINUX_PROC_NS_H +#include <linux/ns_common.h> + struct pid_namespace; struct nsproxy; +struct path; struct proc_ns_operations { const char *name; int type; - void *(*get)(struct task_struct *task); - void (*put)(void *ns); - int (*install)(struct nsproxy *nsproxy, void *ns); - unsigned int (*inum)(void *ns); -}; - -struct proc_ns { - void *ns; - const struct proc_ns_operations *ns_ops; + struct ns_common *(*get)(struct task_struct *task); + void (*put)(struct ns_common *ns); + int (*install)(struct nsproxy *nsproxy, struct ns_common *ns); }; extern const struct proc_ns_operations netns_operations; @@ -43,32 +40,38 @@ enum { extern int pid_ns_prepare_proc(struct pid_namespace *ns); extern void pid_ns_release_proc(struct pid_namespace *ns); -extern struct file *proc_ns_fget(int fd); -extern struct proc_ns *get_proc_ns(struct inode *); extern int proc_alloc_inum(unsigned int *pino); extern void proc_free_inum(unsigned int inum); -extern bool proc_ns_inode(struct inode *inode); #else /* CONFIG_PROC_FS */ static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; } static inline void pid_ns_release_proc(struct pid_namespace *ns) {} -static inline struct file *proc_ns_fget(int fd) -{ - return ERR_PTR(-EINVAL); -} - -static inline struct proc_ns *get_proc_ns(struct inode *inode) { return NULL; } - static inline int proc_alloc_inum(unsigned int *inum) { *inum = 1; return 0; } static inline void proc_free_inum(unsigned int inum) {} -static inline bool proc_ns_inode(struct inode *inode) { return false; } #endif /* CONFIG_PROC_FS */ +static inline int ns_alloc_inum(struct ns_common *ns) +{ + atomic_long_set(&ns->stashed, 0); + return proc_alloc_inum(&ns->inum); +} + +#define ns_free_inum(ns) proc_free_inum((ns)->inum) + +extern struct file *proc_ns_fget(int fd); +#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private) +extern void *ns_get_path(struct path *path, struct task_struct *task, + const struct proc_ns_operations *ns_ops); + +extern int ns_get_name(char *buf, size_t size, struct task_struct *task, + const struct proc_ns_operations *ns_ops); +extern void nsfs_init(void); + #endif /* _LINUX_PROC_NS_H */ diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h index e953726..4cf06c1 100644 --- a/include/linux/user_namespace.h +++ b/include/linux/user_namespace.h @@ -3,6 +3,7 @@ #include <linux/kref.h> #include <linux/nsproxy.h> +#include <linux/ns_common.h> #include <linux/sched.h> #include <linux/err.h> @@ -26,7 +27,7 @@ struct user_namespace { int level; kuid_t owner; kgid_t group; - unsigned int proc_inum; + struct ns_common ns; /* Register of per-UID persistent keyrings for this namespace */ #ifdef CONFIG_PERSISTENT_KEYRINGS diff --git a/include/linux/utsname.h b/include/linux/utsname.h index 239e277..5093f58 100644 --- a/include/linux/utsname.h +++ b/include/linux/utsname.h @@ -5,6 +5,7 @@ #include <linux/sched.h> #include <linux/kref.h> #include <linux/nsproxy.h> +#include <linux/ns_common.h> #include <linux/err.h> #include <uapi/linux/utsname.h> @@ -23,7 +24,7 @@ struct uts_namespace { struct kref kref; struct new_utsname name; struct user_namespace *user_ns; - unsigned int proc_inum; + struct ns_common ns; }; extern struct uts_namespace init_uts_ns; diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index e0d6466..2e8756b8 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -26,6 +26,7 @@ #endif #include <net/netns/nftables.h> #include <net/netns/xfrm.h> +#include <linux/ns_common.h> struct user_namespace; struct proc_dir_entry; @@ -60,7 +61,7 @@ struct net { struct user_namespace *user_ns; /* Owning user namespace */ - unsigned int proc_inum; + struct ns_common ns; struct proc_dir_entry *proc_net; struct proc_dir_entry *proc_net_stat; diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h index 77c6031..7d664ea 100644 --- a/include/uapi/linux/magic.h +++ b/include/uapi/linux/magic.h @@ -72,5 +72,6 @@ #define MTD_INODE_FS_MAGIC 0x11307854 #define ANON_INODE_FS_MAGIC 0x09041934 #define BTRFS_TEST_MAGIC 0x73727279 +#define NSFS_MAGIC 0x6e736673 #endif /* __LINUX_MAGIC_H__ */ diff --git a/init/main.c b/init/main.c index 747ecc4..61b99376 100644 --- a/init/main.c +++ b/init/main.c @@ -79,6 +79,7 @@ #include <linux/random.h> #include <linux/list.h> #include <linux/integrity.h> +#include <linux/proc_ns.h> #include <asm/io.h> #include <asm/bugs.h> @@ -665,6 +666,7 @@ asmlinkage __visible void __init start_kernel(void) /* rootfs populating might need page-writeback */ page_writeback_init(); proc_root_init(); + nsfs_init(); cgroup_init(); cpuset_init(); taskstats_init_early(); diff --git a/init/version.c b/init/version.c index 1a4718e..fe41a63 100644 --- a/init/version.c +++ b/init/version.c @@ -35,7 +35,10 @@ struct uts_namespace init_uts_ns = { .domainname = UTS_DOMAINNAME, }, .user_ns = &init_user_ns, - .proc_inum = PROC_UTS_INIT_INO, + .ns.inum = PROC_UTS_INIT_INO, +#ifdef CONFIG_UTS_NS + .ns.ops = &utsns_operations, +#endif }; EXPORT_SYMBOL_GPL(init_uts_ns); diff --git a/ipc/msgutil.c b/ipc/msgutil.c index 7e70959..2b49159 100644 --- a/ipc/msgutil.c +++ b/ipc/msgutil.c @@ -31,7 +31,10 @@ DEFINE_SPINLOCK(mq_lock); struct ipc_namespace init_ipc_ns = { .count = ATOMIC_INIT(1), .user_ns = &init_user_ns, - .proc_inum = PROC_IPC_INIT_INO, + .ns.inum = PROC_IPC_INIT_INO, +#ifdef CONFIG_IPC_NS + .ns.ops = &ipcns_operations, +#endif }; atomic_t nr_ipc_ns = ATOMIC_INIT(1); diff --git a/ipc/namespace.c b/ipc/namespace.c index 1a3ffd4..068caf1 100644 --- a/ipc/namespace.c +++ b/ipc/namespace.c @@ -26,16 +26,17 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns, if (ns == NULL) return ERR_PTR(-ENOMEM); - err = proc_alloc_inum(&ns->proc_inum); + err = ns_alloc_inum(&ns->ns); if (err) { kfree(ns); return ERR_PTR(err); } + ns->ns.ops = &ipcns_operations; atomic_set(&ns->count, 1); err = mq_init_ns(ns); if (err) { - proc_free_inum(ns->proc_inum); + ns_free_inum(&ns->ns); kfree(ns); return ERR_PTR(err); } @@ -97,7 +98,7 @@ static void free_ipc_ns(struct ipc_namespace *ns) atomic_dec(&nr_ipc_ns); put_user_ns(ns->user_ns); - proc_free_inum(ns->proc_inum); + ns_free_inum(&ns->ns); kfree(ns); } @@ -127,7 +128,12 @@ void put_ipc_ns(struct ipc_namespace *ns) } } -static void *ipcns_get(struct task_struct *task) +static inline struct ipc_namespace *to_ipc_ns(struct ns_common *ns) +{ + return container_of(ns, struct ipc_namespace, ns); +} + +static struct ns_common *ipcns_get(struct task_struct *task) { struct ipc_namespace *ns = NULL; struct nsproxy *nsproxy; @@ -138,17 +144,17 @@ static void *ipcns_get(struct task_struct *task) ns = get_ipc_ns(nsproxy->ipc_ns); task_unlock(task); - return ns; + return ns ? &ns->ns : NULL; } -static void ipcns_put(void *ns) +static void ipcns_put(struct ns_common *ns) { - return put_ipc_ns(ns); + return put_ipc_ns(to_ipc_ns(ns)); } -static int ipcns_install(struct nsproxy *nsproxy, void *new) +static int ipcns_install(struct nsproxy *nsproxy, struct ns_common *new) { - struct ipc_namespace *ns = new; + struct ipc_namespace *ns = to_ipc_ns(new); if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) || !ns_capable(current_user_ns(), CAP_SYS_ADMIN)) return -EPERM; @@ -160,18 +166,10 @@ static int ipcns_install(struct nsproxy *nsproxy, void *new) return 0; } -static unsigned int ipcns_inum(void *vp) -{ - struct ipc_namespace *ns = vp; - - return ns->proc_inum; -} - const struct proc_ns_operations ipcns_operations = { .name = "ipc", .type = CLONE_NEWIPC, .get = ipcns_get, .put = ipcns_put, .install = ipcns_install, - .inum = ipcns_inum, }; diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c index ef42d0a..49746c8 100644 --- a/kernel/nsproxy.c +++ b/kernel/nsproxy.c @@ -220,11 +220,10 @@ void exit_task_namespaces(struct task_struct *p) SYSCALL_DEFINE2(setns, int, fd, int, nstype) { - const struct proc_ns_operations *ops; struct task_struct *tsk = current; struct nsproxy *new_nsproxy; - struct proc_ns *ei; struct file *file; + struct ns_common *ns; int err; file = proc_ns_fget(fd); @@ -232,9 +231,8 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype) return PTR_ERR(file); err = -EINVAL; - ei = get_proc_ns(file_inode(file)); - ops = ei->ns_ops; - if (nstype && (ops->type != nstype)) + ns = get_proc_ns(file_inode(file)); + if (nstype && (ns->ops->type != nstype)) goto out; new_nsproxy = create_new_namespaces(0, tsk, current_user_ns(), tsk->fs); @@ -243,7 +241,7 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype) goto out; } - err = ops->install(new_nsproxy, ei->ns); + err = ns->ops->install(new_nsproxy, ns); if (err) { free_nsproxy(new_nsproxy); goto out; diff --git a/kernel/pid.c b/kernel/pid.c index 82430c8..cd36a5e 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -79,7 +79,10 @@ struct pid_namespace init_pid_ns = { .level = 0, .child_reaper = &init_task, .user_ns = &init_user_ns, - .proc_inum = PROC_PID_INIT_INO, + .ns.inum = PROC_PID_INIT_INO, +#ifdef CONFIG_PID_NS + .ns.ops = &pidns_operations, +#endif }; EXPORT_SYMBOL_GPL(init_pid_ns); diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index bc6d6a8..a65ba13 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -105,9 +105,10 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns if (ns->pid_cachep == NULL) goto out_free_map; - err = proc_alloc_inum(&ns->proc_inum); + err = ns_alloc_inum(&ns->ns); if (err) goto out_free_map; + ns->ns.ops = &pidns_operations; kref_init(&ns->kref); ns->level = level; @@ -142,7 +143,7 @@ static void destroy_pid_namespace(struct pid_namespace *ns) { int i; - proc_free_inum(ns->proc_inum); + ns_free_inum(&ns->ns); for (i = 0; i < PIDMAP_ENTRIES; i++) kfree(ns->pidmap[i].page); put_user_ns(ns->user_ns); @@ -333,7 +334,12 @@ int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) return 0; } -static void *pidns_get(struct task_struct *task) +static inline struct pid_namespace *to_pid_ns(struct ns_common *ns) +{ + return container_of(ns, struct pid_namespace, ns); +} + +static struct ns_common *pidns_get(struct task_struct *task) { struct pid_namespace *ns; @@ -343,18 +349,18 @@ static void *pidns_get(struct task_struct *task) get_pid_ns(ns); rcu_read_unlock(); - return ns; + return ns ? &ns->ns : NULL; } -static void pidns_put(void *ns) +static void pidns_put(struct ns_common *ns) { - put_pid_ns(ns); + put_pid_ns(to_pid_ns(ns)); } -static int pidns_install(struct nsproxy *nsproxy, void *ns) +static int pidns_install(struct nsproxy *nsproxy, struct ns_common *ns) { struct pid_namespace *active = task_active_pid_ns(current); - struct pid_namespace *ancestor, *new = ns; + struct pid_namespace *ancestor, *new = to_pid_ns(ns); if (!ns_capable(new->user_ns, CAP_SYS_ADMIN) || !ns_capable(current_user_ns(), CAP_SYS_ADMIN)) @@ -382,19 +388,12 @@ static int pidns_install(struct nsproxy *nsproxy, void *ns) return 0; } -static unsigned int pidns_inum(void *ns) -{ - struct pid_namespace *pid_ns = ns; - return pid_ns->proc_inum; -} - const struct proc_ns_operations pidns_operations = { .name = "pid", .type = CLONE_NEWPID, .get = pidns_get, .put = pidns_put, .install = pidns_install, - .inum = pidns_inum, }; static __init int pid_namespaces_init(void) diff --git a/kernel/user.c b/kernel/user.c index 4efa393..69b800a 100644 --- a/kernel/user.c +++ b/kernel/user.c @@ -50,7 +50,10 @@ struct user_namespace init_user_ns = { .count = ATOMIC_INIT(3), .owner = GLOBAL_ROOT_UID, .group = GLOBAL_ROOT_GID, - .proc_inum = PROC_USER_INIT_INO, + .ns.inum = PROC_USER_INIT_INO, +#ifdef CONFIG_USER_NS + .ns.ops = &userns_operations, +#endif #ifdef CONFIG_PERSISTENT_KEYRINGS .persistent_keyring_register_sem = __RWSEM_INITIALIZER(init_user_ns.persistent_keyring_register_sem), diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index aa312b0..1491ad0 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -86,11 +86,12 @@ int create_user_ns(struct cred *new) if (!ns) return -ENOMEM; - ret = proc_alloc_inum(&ns->proc_inum); + ret = ns_alloc_inum(&ns->ns); if (ret) { kmem_cache_free(user_ns_cachep, ns); return ret; } + ns->ns.ops = &userns_operations; atomic_set(&ns->count, 1); /* Leave the new->user_ns reference with the new user namespace. */ @@ -136,7 +137,7 @@ void free_user_ns(struct user_namespace *ns) #ifdef CONFIG_PERSISTENT_KEYRINGS key_put(ns->persistent_keyring_register); #endif - proc_free_inum(ns->proc_inum); + ns_free_inum(&ns->ns); kmem_cache_free(user_ns_cachep, ns); ns = parent; } while (atomic_dec_and_test(&parent->count)); @@ -841,7 +842,12 @@ static bool new_idmap_permitted(const struct file *file, return false; } -static void *userns_get(struct task_struct *task) +static inline struct user_namespace *to_user_ns(struct ns_common *ns) +{ + return container_of(ns, struct user_namespace, ns); +} + +static struct ns_common *userns_get(struct task_struct *task) { struct user_namespace *user_ns; @@ -849,17 +855,17 @@ static void *userns_get(struct task_struct *task) user_ns = get_user_ns(__task_cred(task)->user_ns); rcu_read_unlock(); - return user_ns; + return user_ns ? &user_ns->ns : NULL; } -static void userns_put(void *ns) +static void userns_put(struct ns_common *ns) { - put_user_ns(ns); + put_user_ns(to_user_ns(ns)); } -static int userns_install(struct nsproxy *nsproxy, void *ns) +static int userns_install(struct nsproxy *nsproxy, struct ns_common *ns) { - struct user_namespace *user_ns = ns; + struct user_namespace *user_ns = to_user_ns(ns); struct cred *cred; /* Don't allow gaining capabilities by reentering @@ -888,19 +894,12 @@ static int userns_install(struct nsproxy *nsproxy, void *ns) return commit_creds(cred); } -static unsigned int userns_inum(void *ns) -{ - struct user_namespace *user_ns = ns; - return user_ns->proc_inum; -} - const struct proc_ns_operations userns_operations = { .name = "user", .type = CLONE_NEWUSER, .get = userns_get, .put = userns_put, .install = userns_install, - .inum = userns_inum, }; static __init int user_namespaces_init(void) diff --git a/kernel/utsname.c b/kernel/utsname.c index 883aaaa..831ea71 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -42,12 +42,14 @@ static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns, if (!ns) return ERR_PTR(-ENOMEM); - err = proc_alloc_inum(&ns->proc_inum); + err = ns_alloc_inum(&ns->ns); if (err) { kfree(ns); return ERR_PTR(err); } + ns->ns.ops = &utsns_operations; + down_read(&uts_sem); memcpy(&ns->name, &old_ns->name, sizeof(ns->name)); ns->user_ns = get_user_ns(user_ns); @@ -84,11 +86,16 @@ void free_uts_ns(struct kref *kref) ns = container_of(kref, struct uts_namespace, kref); put_user_ns(ns->user_ns); - proc_free_inum(ns->proc_inum); + ns_free_inum(&ns->ns); kfree(ns); } -static void *utsns_get(struct task_struct *task) +static inline struct uts_namespace *to_uts_ns(struct ns_common *ns) +{ + return container_of(ns, struct uts_namespace, ns); +} + +static struct ns_common *utsns_get(struct task_struct *task) { struct uts_namespace *ns = NULL; struct nsproxy *nsproxy; @@ -101,17 +108,17 @@ static void *utsns_get(struct task_struct *task) } task_unlock(task); - return ns; + return ns ? &ns->ns : NULL; } -static void utsns_put(void *ns) +static void utsns_put(struct ns_common *ns) { - put_uts_ns(ns); + put_uts_ns(to_uts_ns(ns)); } -static int utsns_install(struct nsproxy *nsproxy, void *new) +static int utsns_install(struct nsproxy *nsproxy, struct ns_common *new) { - struct uts_namespace *ns = new; + struct uts_namespace *ns = to_uts_ns(new); if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) || !ns_capable(current_user_ns(), CAP_SYS_ADMIN)) @@ -123,18 +130,10 @@ static int utsns_install(struct nsproxy *nsproxy, void *new) return 0; } -static unsigned int utsns_inum(void *vp) -{ - struct uts_namespace *ns = vp; - - return ns->proc_inum; -} - const struct proc_ns_operations utsns_operations = { .name = "uts", .type = CLONE_NEWUTS, .get = utsns_get, .put = utsns_put, .install = utsns_install, - .inum = utsns_inum, }; diff --git a/net/Makefile b/net/Makefile index 95fc694..38704bd 100644 --- a/net/Makefile +++ b/net/Makefile @@ -5,8 +5,6 @@ # Rewritten to use lists instead of if-statements. # -obj-y := nonet.o - obj-$(CONFIG_NET) := socket.o core/ tmp-$(CONFIG_COMPAT) := compat.o diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c index 7f15517..ce780c7 100644 --- a/net/core/net_namespace.c +++ b/net/core/net_namespace.c @@ -337,17 +337,17 @@ EXPORT_SYMBOL_GPL(__put_net); struct net *get_net_ns_by_fd(int fd) { - struct proc_ns *ei; struct file *file; + struct ns_common *ns; struct net *net; file = proc_ns_fget(fd); if (IS_ERR(file)) return ERR_CAST(file); - ei = get_proc_ns(file_inode(file)); - if (ei->ns_ops == &netns_operations) - net = get_net(ei->ns); + ns = get_proc_ns(file_inode(file)); + if (ns->ops == &netns_operations) + net = get_net(container_of(ns, struct net, ns)); else net = ERR_PTR(-EINVAL); @@ -386,12 +386,15 @@ EXPORT_SYMBOL_GPL(get_net_ns_by_pid); static __net_init int net_ns_net_init(struct net *net) { - return proc_alloc_inum(&net->proc_inum); +#ifdef CONFIG_NET_NS + net->ns.ops = &netns_operations; +#endif + return ns_alloc_inum(&net->ns); } static __net_exit void net_ns_net_exit(struct net *net) { - proc_free_inum(net->proc_inum); + ns_free_inum(&net->ns); } static struct pernet_operations __net_initdata net_ns_ops = { @@ -629,7 +632,7 @@ void unregister_pernet_device(struct pernet_operations *ops) EXPORT_SYMBOL_GPL(unregister_pernet_device); #ifdef CONFIG_NET_NS -static void *netns_get(struct task_struct *task) +static struct ns_common *netns_get(struct task_struct *task) { struct net *net = NULL; struct nsproxy *nsproxy; @@ -640,17 +643,22 @@ static void *netns_get(struct task_struct *task) net = get_net(nsproxy->net_ns); task_unlock(task); - return net; + return net ? &net->ns : NULL; } -static void netns_put(void *ns) +static inline struct net *to_net_ns(struct ns_common *ns) { - put_net(ns); + return container_of(ns, struct net, ns); } -static int netns_install(struct nsproxy *nsproxy, void *ns) +static void netns_put(struct ns_common *ns) { - struct net *net = ns; + put_net(to_net_ns(ns)); +} + +static int netns_install(struct nsproxy *nsproxy, struct ns_common *ns) +{ + struct net *net = to_net_ns(ns); if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) || !ns_capable(current_user_ns(), CAP_SYS_ADMIN)) @@ -661,18 +669,11 @@ static int netns_install(struct nsproxy *nsproxy, void *ns) return 0; } -static unsigned int netns_inum(void *ns) -{ - struct net *net = ns; - return net->proc_inum; -} - const struct proc_ns_operations netns_operations = { .name = "net", .type = CLONE_NEWNET, .get = netns_get, .put = netns_put, .install = netns_install, - .inum = netns_inum, }; #endif diff --git a/net/nonet.c b/net/nonet.c deleted file mode 100644 index b1a73fd..0000000 --- a/net/nonet.c +++ /dev/null @@ -1,26 +0,0 @@ -/* - * net/nonet.c - * - * Dummy functions to allow us to configure network support entirely - * out of the kernel. - * - * Distributed under the terms of the GNU GPL version 2. - * Copyright (c) Matthew Wilcox 2003 - */ - -#include <linux/module.h> -#include <linux/errno.h> -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/kernel.h> - -static int sock_no_open(struct inode *irrelevant, struct file *dontcare) -{ - return -ENXIO; -} - -const struct file_operations bad_sock_fops = { - .owner = THIS_MODULE, - .open = sock_no_open, - .llseek = noop_llseek, -}; diff --git a/net/socket.c b/net/socket.c index 8809afc..70bbde6 100644 --- a/net/socket.c +++ b/net/socket.c @@ -113,7 +113,6 @@ unsigned int sysctl_net_busy_read __read_mostly; unsigned int sysctl_net_busy_poll __read_mostly; #endif -static int sock_no_open(struct inode *irrelevant, struct file *dontcare); static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, unsigned long nr_segs, loff_t pos); static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, @@ -151,7 +150,6 @@ static const struct file_operations socket_file_ops = { .compat_ioctl = compat_sock_ioctl, #endif .mmap = sock_mmap, - .open = sock_no_open, /* special open code to disallow open via /proc */ .release = sock_close, .fasync = sock_fasync, .sendpage = sock_sendpage, @@ -559,23 +557,6 @@ static struct socket *sock_alloc(void) return sock; } -/* - * In theory you can't get an open on this inode, but /proc provides - * a back door. Remember to keep it shut otherwise you'll let the - * creepy crawlies in. - */ - -static int sock_no_open(struct inode *irrelevant, struct file *dontcare) -{ - return -ENXIO; -} - -const struct file_operations bad_sock_fops = { - .owner = THIS_MODULE, - .open = sock_no_open, - .llseek = noop_llseek, -}; - /** * sock_release - close a socket * @sock: socket to close |
