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sysfs: drop kobj_ns_type handling, take #2
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The way namespace tags are implemented in sysfs is more complicated
than necessary.  As each tag is a pointer value and required to be
non-NULL under a namespace enabled parent, there's no need to record
separately what type each tag is.  If multiple namespace types are
needed, which currently aren't, we can simply compare the tag to a set
of allowed tags in the superblock assuming that the tags, being
pointers, won't have the same value across multiple types.

This patch rips out kobj_ns_type handling from sysfs.  sysfs now has
an enable switch to turn on namespace under a node.  If enabled, all
children are required to have non-NULL namespace tags and filtered
against the super_block's tag.

kobject namespace determination is now performed in
lib/kobject.c::create_dir() making sysfs_read_ns_type() unnecessary.
The sanity checks are also moved.  create_dir() is restructured to
ease such addition.  This removes most kobject namespace knowledge
from sysfs proper which will enable proper separation and layering of
sysfs.

This is the second try.  The first one was cb26a31 ("sysfs: drop
kobj_ns_type handling") which tried to automatically enable namespace
if there are children with non-NULL namespace tags; however, it was
broken for symlinks as they should inherit the target's tag iff
namespace is enabled in the parent.  This led to namespace filtering
enabled incorrectly for wireless net class devices through phy80211
symlinks and thus network configuration failure.  a1212d2
("Revert "sysfs: drop kobj_ns_type handling"") reverted the commit.

This shouldn't introduce any behavior changes, for real.

v2: Dummy implementation of sysfs_enable_ns() for !CONFIG_SYSFS was
    missing and caused build failure.  Reported by kbuild test robot.

Signed-off-by: Tejun Heo <[email protected]>
Reported-by: Linus Torvalds <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Kay Sievers <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: kbuild test robot <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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@htejun @gregkh
htejun authored and gregkh committed Nov 27, 2013
1 parent 6ce4eac commit c84a3b2
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Showing 6 changed files with 83 additions and 117 deletions.
92 changes: 36 additions & 56 deletions fs/sysfs/dir.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -279,7 +279,6 @@ static int sysfs_dentry_delete(const struct dentry *dentry)
static int sysfs_dentry_revalidate(struct dentry *dentry, unsigned int flags)
{
struct sysfs_dirent *sd;
int type;

if (flags & LOOKUP_RCU)
return -ECHILD;
Expand All @@ -300,13 +299,9 @@ static int sysfs_dentry_revalidate(struct dentry *dentry, unsigned int flags)
goto out_bad;

/* The sysfs dirent has been moved to a different namespace */
type = KOBJ_NS_TYPE_NONE;
if (sd->s_parent) {
type = sysfs_ns_type(sd->s_parent);
if (type != KOBJ_NS_TYPE_NONE &&
sysfs_info(dentry->d_sb)->ns[type] != sd->s_ns)
goto out_bad;
}
if (sd->s_parent && (sd->s_parent->s_flags & SYSFS_FLAG_NS) &&
sysfs_info(dentry->d_sb)->ns != sd->s_ns)
goto out_bad;

mutex_unlock(&sysfs_mutex);
out_valid:
Expand Down Expand Up @@ -423,13 +418,14 @@ void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt)
int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
struct sysfs_dirent *parent_sd)
{
bool has_ns = parent_sd->s_flags & SYSFS_FLAG_NS;
struct sysfs_inode_attrs *ps_iattr;
int ret;

if (!!sysfs_ns_type(parent_sd) != !!sd->s_ns) {
if (has_ns != (bool)sd->s_ns) {
WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n",
sysfs_ns_type(parent_sd) ? "required" : "invalid",
parent_sd->s_name, sd->s_name);
has_ns ? "required" : "invalid",
parent_sd->s_name, sd->s_name);
return -EINVAL;
}

Expand Down Expand Up @@ -610,12 +606,13 @@ struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
const void *ns)
{
struct rb_node *node = parent_sd->s_dir.children.rb_node;
bool has_ns = parent_sd->s_flags & SYSFS_FLAG_NS;
unsigned int hash;

if (!!sysfs_ns_type(parent_sd) != !!ns) {
if (has_ns != (bool)ns) {
WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n",
sysfs_ns_type(parent_sd) ? "required" : "invalid",
parent_sd->s_name, name);
has_ns ? "required" : "invalid",
parent_sd->s_name, name);
return NULL;
}

Expand Down Expand Up @@ -667,7 +664,6 @@ struct sysfs_dirent *sysfs_get_dirent_ns(struct sysfs_dirent *parent_sd,
EXPORT_SYMBOL_GPL(sysfs_get_dirent_ns);

static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
enum kobj_ns_type type,
const char *name, const void *ns,
struct sysfs_dirent **p_sd)
{
Expand All @@ -681,7 +677,6 @@ static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
if (!sd)
return -ENOMEM;

sd->s_flags |= (type << SYSFS_NS_TYPE_SHIFT);
sd->s_ns = ns;
sd->s_dir.kobj = kobj;

Expand All @@ -701,33 +696,7 @@ static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
int sysfs_create_subdir(struct kobject *kobj, const char *name,
struct sysfs_dirent **p_sd)
{
return create_dir(kobj, kobj->sd,
KOBJ_NS_TYPE_NONE, name, NULL, p_sd);
}

/**
* sysfs_read_ns_type: return associated ns_type
* @kobj: the kobject being queried
*
* Each kobject can be tagged with exactly one namespace type
* (i.e. network or user). Return the ns_type associated with
* this object if any
*/
static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj)
{
const struct kobj_ns_type_operations *ops;
enum kobj_ns_type type;

ops = kobj_child_ns_ops(kobj);
if (!ops)
return KOBJ_NS_TYPE_NONE;

type = ops->type;
BUG_ON(type <= KOBJ_NS_TYPE_NONE);
BUG_ON(type >= KOBJ_NS_TYPES);
BUG_ON(!kobj_ns_type_registered(type));

return type;
return create_dir(kobj, kobj->sd, name, NULL, p_sd);
}

/**
Expand All @@ -737,7 +706,6 @@ static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj)
*/
int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
{
enum kobj_ns_type type;
struct sysfs_dirent *parent_sd, *sd;
int error = 0;

Expand All @@ -751,9 +719,7 @@ int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
if (!parent_sd)
return -ENOENT;

type = sysfs_read_ns_type(kobj);

error = create_dir(kobj, parent_sd, type, kobject_name(kobj), ns, &sd);
error = create_dir(kobj, parent_sd, kobject_name(kobj), ns, &sd);
if (!error)
kobj->sd = sd;
return error;
Expand All @@ -767,13 +733,12 @@ static struct dentry *sysfs_lookup(struct inode *dir, struct dentry *dentry,
struct sysfs_dirent *parent_sd = parent->d_fsdata;
struct sysfs_dirent *sd;
struct inode *inode;
enum kobj_ns_type type;
const void *ns;
const void *ns = NULL;

mutex_lock(&sysfs_mutex);

type = sysfs_ns_type(parent_sd);
ns = sysfs_info(dir->i_sb)->ns[type];
if (parent_sd->s_flags & SYSFS_FLAG_NS)
ns = sysfs_info(dir->i_sb)->ns;

sd = sysfs_find_dirent(parent_sd, dentry->d_name.name, ns);

Expand Down Expand Up @@ -1029,6 +994,21 @@ int sysfs_move_dir_ns(struct kobject *kobj, struct kobject *new_parent_kobj,
return sysfs_rename(sd, new_parent_sd, sd->s_name, new_ns);
}

/**
* sysfs_enable_ns - enable namespace under a directory
* @sd: directory of interest, should be empty
*
* This is to be called right after @sd is created to enable namespace
* under it. All children of @sd must have non-NULL namespace tags and
* only the ones which match the super_block's tag will be visible.
*/
void sysfs_enable_ns(struct sysfs_dirent *sd)
{
WARN_ON_ONCE(sysfs_type(sd) != SYSFS_DIR);
WARN_ON_ONCE(!RB_EMPTY_ROOT(&sd->s_dir.children));
sd->s_flags |= SYSFS_FLAG_NS;
}

/* Relationship between s_mode and the DT_xxx types */
static inline unsigned char dt_type(struct sysfs_dirent *sd)
{
Expand Down Expand Up @@ -1096,15 +1076,15 @@ static int sysfs_readdir(struct file *file, struct dir_context *ctx)
struct dentry *dentry = file->f_path.dentry;
struct sysfs_dirent *parent_sd = dentry->d_fsdata;
struct sysfs_dirent *pos = file->private_data;
enum kobj_ns_type type;
const void *ns;

type = sysfs_ns_type(parent_sd);
ns = sysfs_info(dentry->d_sb)->ns[type];
const void *ns = NULL;

if (!dir_emit_dots(file, ctx))
return 0;
mutex_lock(&sysfs_mutex);

if (parent_sd->s_flags & SYSFS_FLAG_NS)
ns = sysfs_info(dentry->d_sb)->ns;

for (pos = sysfs_dir_pos(ns, parent_sd, ctx->pos, pos);
pos;
pos = sysfs_dir_next_pos(ns, parent_sd, ctx->pos, pos)) {
Expand Down
24 changes: 6 additions & 18 deletions fs/sysfs/mount.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ static const struct super_operations sysfs_ops = {
struct sysfs_dirent sysfs_root = {
.s_name = "",
.s_count = ATOMIC_INIT(1),
.s_flags = SYSFS_DIR | (KOBJ_NS_TYPE_NONE << SYSFS_NS_TYPE_SHIFT),
.s_flags = SYSFS_DIR,
.s_mode = S_IFDIR | S_IRUGO | S_IXUGO,
.s_ino = 1,
};
Expand Down Expand Up @@ -77,14 +77,8 @@ static int sysfs_test_super(struct super_block *sb, void *data)
{
struct sysfs_super_info *sb_info = sysfs_info(sb);
struct sysfs_super_info *info = data;
enum kobj_ns_type type;
int found = 1;

for (type = KOBJ_NS_TYPE_NONE; type < KOBJ_NS_TYPES; type++) {
if (sb_info->ns[type] != info->ns[type])
found = 0;
}
return found;
return sb_info->ns == info->ns;
}

static int sysfs_set_super(struct super_block *sb, void *data)
Expand All @@ -98,36 +92,30 @@ static int sysfs_set_super(struct super_block *sb, void *data)

static void free_sysfs_super_info(struct sysfs_super_info *info)
{
int type;
for (type = KOBJ_NS_TYPE_NONE; type < KOBJ_NS_TYPES; type++)
kobj_ns_drop(type, info->ns[type]);
kobj_ns_drop(KOBJ_NS_TYPE_NET, info->ns);
kfree(info);
}

static struct dentry *sysfs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
struct sysfs_super_info *info;
enum kobj_ns_type type;
struct super_block *sb;
int error;

if (!(flags & MS_KERNMOUNT)) {
if (!capable(CAP_SYS_ADMIN) && !fs_fully_visible(fs_type))
return ERR_PTR(-EPERM);

for (type = KOBJ_NS_TYPE_NONE; type < KOBJ_NS_TYPES; type++) {
if (!kobj_ns_current_may_mount(type))
return ERR_PTR(-EPERM);
}
if (!kobj_ns_current_may_mount(KOBJ_NS_TYPE_NET))
return ERR_PTR(-EPERM);
}

info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return ERR_PTR(-ENOMEM);

for (type = KOBJ_NS_TYPE_NONE; type < KOBJ_NS_TYPES; type++)
info->ns[type] = kobj_ns_grab_current(type);
info->ns = kobj_ns_grab_current(KOBJ_NS_TYPE_NET);

sb = sget(fs_type, sysfs_test_super, sysfs_set_super, flags, info);
if (IS_ERR(sb) || sb->s_fs_info != info)
Expand Down
26 changes: 6 additions & 20 deletions fs/sysfs/symlink.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,6 @@ static int sysfs_do_create_link_sd(struct sysfs_dirent *parent_sd,
struct sysfs_dirent *target_sd = NULL;
struct sysfs_dirent *sd = NULL;
struct sysfs_addrm_cxt acxt;
enum kobj_ns_type ns_type;
int error;

BUG_ON(!name || !parent_sd);
Expand All @@ -52,29 +51,16 @@ static int sysfs_do_create_link_sd(struct sysfs_dirent *parent_sd,
if (!sd)
goto out_put;

ns_type = sysfs_ns_type(parent_sd);
if (ns_type)
if (parent_sd->s_flags & SYSFS_FLAG_NS)
sd->s_ns = target_sd->s_ns;
sd->s_symlink.target_sd = target_sd;
target_sd = NULL; /* reference is now owned by the symlink */

sysfs_addrm_start(&acxt);
/* Symlinks must be between directories with the same ns_type */
if (!ns_type ||
(ns_type == sysfs_ns_type(sd->s_symlink.target_sd->s_parent))) {
if (warn)
error = sysfs_add_one(&acxt, sd, parent_sd);
else
error = __sysfs_add_one(&acxt, sd, parent_sd);
} else {
error = -EINVAL;
WARN(1, KERN_WARNING
"sysfs: symlink across ns_types %s/%s -> %s/%s\n",
parent_sd->s_name,
sd->s_name,
sd->s_symlink.target_sd->s_parent->s_name,
sd->s_symlink.target_sd->s_name);
}
if (warn)
error = sysfs_add_one(&acxt, sd, parent_sd);
else
error = __sysfs_add_one(&acxt, sd, parent_sd);
sysfs_addrm_finish(&acxt);

if (error)
Expand Down Expand Up @@ -164,7 +150,7 @@ void sysfs_delete_link(struct kobject *kobj, struct kobject *targ,
* sysfs_remove_dir() for details.
*/
spin_lock(&sysfs_symlink_target_lock);
if (targ->sd && sysfs_ns_type(kobj->sd))
if (targ->sd && (kobj->sd->s_flags & SYSFS_FLAG_NS))
ns = targ->sd->s_ns;
spin_unlock(&sysfs_symlink_target_lock);
sysfs_hash_and_remove(kobj->sd, name, ns);
Expand Down
25 changes: 7 additions & 18 deletions fs/sysfs/sysfs.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -90,27 +90,15 @@ struct sysfs_dirent {
#define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
#define SYSFS_ACTIVE_REF (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR)

/* identify any namespace tag on sysfs_dirents */
#define SYSFS_NS_TYPE_MASK 0xf00
#define SYSFS_NS_TYPE_SHIFT 8

#define SYSFS_FLAG_MASK ~(SYSFS_NS_TYPE_MASK|SYSFS_TYPE_MASK)
#define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
#define SYSFS_FLAG_NS 0x01000
#define SYSFS_FLAG_REMOVED 0x02000

static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
{
return sd->s_flags & SYSFS_TYPE_MASK;
}

/*
* Return any namespace tags on this dirent.
* enum kobj_ns_type is defined in linux/kobject.h
*/
static inline enum kobj_ns_type sysfs_ns_type(struct sysfs_dirent *sd)
{
return (sd->s_flags & SYSFS_NS_TYPE_MASK) >> SYSFS_NS_TYPE_SHIFT;
}

#ifdef CONFIG_DEBUG_LOCK_ALLOC

#define sysfs_dirent_init_lockdep(sd) \
Expand Down Expand Up @@ -155,12 +143,13 @@ struct sysfs_addrm_cxt {
*/

/*
* Each sb is associated with a set of namespace tags (i.e.
* the network namespace of the task which mounted this sysfs
* instance).
* Each sb is associated with one namespace tag, currently the network
* namespace of the task which mounted this sysfs instance. If multiple
* tags become necessary, make the following an array and compare
* sysfs_dirent tag against every entry.
*/
struct sysfs_super_info {
void *ns[KOBJ_NS_TYPES];
void *ns;
};
#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
extern struct sysfs_dirent sysfs_root;
Expand Down
6 changes: 6 additions & 0 deletions include/linux/sysfs.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -220,6 +220,8 @@ int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *target,
void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
const char *name);

void sysfs_enable_ns(struct sysfs_dirent *sd);

int __must_check sysfs_create_group(struct kobject *kobj,
const struct attribute_group *grp);
int __must_check sysfs_create_groups(struct kobject *kobj,
Expand Down Expand Up @@ -353,6 +355,10 @@ static inline void sysfs_delete_link(struct kobject *k, struct kobject *t,
{
}

static inline void sysfs_enable_ns(struct sysfs_dirent *sd)
{
}

static inline int sysfs_create_group(struct kobject *kobj,
const struct attribute_group *grp)
{
Expand Down
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