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[PATCH v2 00/19] Support fuse mounts in user namespaces

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  [PATCH v2 00/19] Support fuse mounts in user namespaces Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:30 +0100
    [PATCH v2 15/18] fuse: Add support for pid namespaces Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:30 +0100
    [PATCH v2 13/18] fs: Allow superblock owner to access do_remount_sb() Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:30 +0100
    [PATCH v2 17/18] fuse: Restrict allow_other to the superblock's namespace or a descendant Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:30 +0100
    [PATCH v2 10/18] fs: Update posix_acl support to handle user namespace mounts Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:30 +0100
    [PATCH v2 04/18] selinux: Add support for unprivileged mounts from user namespaces Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100
    [PATCH v2 05/18] userns: Replace in_userns with current_in_userns Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100
    [PATCH v2 09/18] fs: Refuse uid/gid changes which don't map into s_user_ns Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100
    [PATCH v2 06/18] Smack: Handle labels consistently in untrusted mounts Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100
    [PATCH v2 01/18] block_dev: Support checking inode permissions in lookup_bdev() Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100
    [PATCH v2 02/18] block_dev: Check permissions towards block device inode when mounting Seth Forshee <seth.forshee@canonical.com> - 2015-12-07 22:40 +0100

#1285950 — [PATCH v2 00/19] Support fuse mounts in user namespaces

These patches implement support for mounting filesystems in user
namespaces using fuse. They are based on the patches in the for-testing
branch of
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git,
but I've rebased them onto 4.4-rc3. I've pushed all of this to:

 git://git.kernel.org/pub/scm/linux/kernel/git/sforshee/linux.git fuse-userns

The patches are organized into three high-level groups.

Patches 1-6 are related to security, adding restrictions for
unprivileged mounts and updating the LSMs as needed. Patches 1-2
(checking inode permissions for block device mounts) may not be strictly
necessary for fuseblk mounts since fuse doesn't do any IO on the block
device in the kernel, but it still seems like a good idea to fail the
mount if the user doesn't have the required permissions for the inode
(though this is a bit misleading with fuse since the mounts are done via
a suid-root helper).

Patches 7-14 update most of the vfs to translate ids correctly and deal
with inodes which may have invalid user/group ids. I've omitted patches
for anything not used by fuse - quota, fs freezing, some helper
functions, etc. - but if these are wanted for the sake of completeness I
can include them.

Patches 15-18 update fuse to deal with mounts from non-init pid and user
namespaces and enable mounting from user namespaces.

Changes since v1:
 - Drop patch for FIBMAP.
 - Use current_in_userns in fuse_allow_current_process.
 - Remove checks for uid/gid validity in fuse. Intead, ids from the
   backing store which do not map into s_user_ns will result in invalid
   ids in the vfs inode. Checks in the vfs will prevent unmappable ids
   from being passed in from above.
 - Update a couple of commit messages to provide more detail about
   changes.

Thanks,
Seth

Andy Lutomirski (1):
  fs: Treat foreign mounts as nosuid

Seth Forshee (17):
  block_dev: Support checking inode permissions in lookup_bdev()
  block_dev: Check permissions towards block device inode when mounting
  selinux: Add support for unprivileged mounts from user namespaces
  userns: Replace in_userns with current_in_userns
  Smack: Handle labels consistently in untrusted mounts
  fs: Check for invalid i_uid in may_follow_link()
  cred: Reject inodes with invalid ids in set_create_file_as()
  fs: Refuse uid/gid changes which don't map into s_user_ns
  fs: Update posix_acl support to handle user namespace mounts
  fs: Ensure the mounter of a filesystem is privileged towards its
    inodes
  fs: Don't remove suid for CAP_FSETID in s_user_ns
  fs: Allow superblock owner to access do_remount_sb()
  capabilities: Allow privileged user in s_user_ns to set security.*
    xattrs
  fuse: Add support for pid namespaces
  fuse: Support fuse filesystems outside of init_user_ns
  fuse: Restrict allow_other to the superblock's namespace or a
    descendant
  fuse: Allow user namespace mounts

 drivers/md/bcache/super.c       |  2 +-
 drivers/md/dm-table.c           |  2 +-
 drivers/mtd/mtdsuper.c          |  2 +-
 fs/attr.c                       | 11 +++++++
 fs/block_dev.c                  | 18 +++++++++--
 fs/exec.c                       |  2 +-
 fs/fuse/cuse.c                  |  3 +-
 fs/fuse/dev.c                   | 26 ++++++++++++----
 fs/fuse/dir.c                   | 16 +++++-----
 fs/fuse/file.c                  | 22 +++++++++++---
 fs/fuse/fuse_i.h                | 10 +++++-
 fs/fuse/inode.c                 | 42 +++++++++++++++++---------
 fs/inode.c                      |  6 +++-
 fs/namei.c                      |  2 +-
 fs/namespace.c                  | 17 +++++++++--
 fs/posix_acl.c                  | 67 ++++++++++++++++++++++++++---------------
 fs/quota/quota.c                |  2 +-
 fs/xattr.c                      | 19 +++++++++---
 include/linux/fs.h              |  2 +-
 include/linux/mount.h           |  1 +
 include/linux/posix_acl_xattr.h | 17 ++++++++---
 include/linux/uidgid.h          | 10 ++++++
 include/linux/user_namespace.h  |  6 ++--
 kernel/capability.c             | 13 +++++---
 kernel/cred.c                   |  2 ++
 kernel/user_namespace.c         |  6 ++--
 security/commoncap.c            | 16 ++++++----
 security/selinux/hooks.c        | 25 ++++++++++++++-
 security/smack/smack_lsm.c      | 29 ++++++++++++------
 29 files changed, 287 insertions(+), 109 deletions(-)

-- 
1.9.1

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#1285951 — [PATCH v2 15/18] fuse: Add support for pid namespaces

If the userspace process servicing fuse requests is running in
a pid namespace then pids passed via the fuse fd need to be
translated relative to that namespace. Capture the pid namespace
in use when the filesystem is mounted and use this for pid
translation.

Since no use case currently exists for changing namespaces all
translations are done relative to the pid namespace in use when
/dev/fuse is opened. Mounting or /dev/fuse IO from another
namespace will return errors.

Requests from processes whose pid cannot be translated into the
target namespace are not permitted, except for requests
allocated via fuse_get_req_nofail_nopages. For no-fail requests
in.h.pid will be 0 if the pid translation fails.

File locking changes based on previous work done by Eric
Biederman.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
 fs/fuse/dev.c    | 19 +++++++++++++++----
 fs/fuse/file.c   | 22 +++++++++++++++++-----
 fs/fuse/fuse_i.h |  4 ++++
 fs/fuse/inode.c  |  3 +++
 4 files changed, 39 insertions(+), 9 deletions(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index ebb5e37455a0..a4f6f30d6d86 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -19,6 +19,7 @@
 #include <linux/pipe_fs_i.h>
 #include <linux/swap.h>
 #include <linux/splice.h>
+#include <linux/sched.h>
 
 MODULE_ALIAS_MISCDEV(FUSE_MINOR);
 MODULE_ALIAS("devname:fuse");
@@ -124,11 +125,11 @@ static void __fuse_put_request(struct fuse_req *req)
 	atomic_dec(&req->count);
 }
 
-static void fuse_req_init_context(struct fuse_req *req)
+static void fuse_req_init_context(struct fuse_conn *fc, struct fuse_req *req)
 {
 	req->in.h.uid = from_kuid_munged(&init_user_ns, current_fsuid());
 	req->in.h.gid = from_kgid_munged(&init_user_ns, current_fsgid());
-	req->in.h.pid = current->pid;
+	req->in.h.pid = pid_nr_ns(task_pid(current), fc->pid_ns);
 }
 
 void fuse_set_initialized(struct fuse_conn *fc)
@@ -181,10 +182,14 @@ static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages,
 		goto out;
 	}
 
-	fuse_req_init_context(req);
+	fuse_req_init_context(fc, req);
 	__set_bit(FR_WAITING, &req->flags);
 	if (for_background)
 		__set_bit(FR_BACKGROUND, &req->flags);
+	if (req->in.h.pid == 0) {
+		fuse_put_request(fc, req);
+		return ERR_PTR(-EOVERFLOW);
+	}
 
 	return req;
 
@@ -274,7 +279,7 @@ struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
 	if (!req)
 		req = get_reserved_req(fc, file);
 
-	fuse_req_init_context(req);
+	fuse_req_init_context(fc, req);
 	__set_bit(FR_WAITING, &req->flags);
 	__clear_bit(FR_BACKGROUND, &req->flags);
 	return req;
@@ -1243,6 +1248,9 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
 	struct fuse_in *in;
 	unsigned reqsize;
 
+	if (task_active_pid_ns(current) != fc->pid_ns)
+		return -EIO;
+
  restart:
 	spin_lock(&fiq->waitq.lock);
 	err = -EAGAIN;
@@ -1872,6 +1880,9 @@ static ssize_t fuse_dev_do_write(struct fuse_dev *fud,
 	struct fuse_req *req;
 	struct fuse_out_header oh;
 
+	if (task_active_pid_ns(current) != fc->pid_ns)
+		return -EIO;
+
 	if (nbytes < sizeof(struct fuse_out_header))
 		return -EINVAL;
 
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index e0faf8f2c868..a6c7484c94ee 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2061,7 +2061,8 @@ static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma)
 	return generic_file_mmap(file, vma);
 }
 
-static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
+static int convert_fuse_file_lock(struct fuse_conn *fc,
+				  const struct fuse_file_lock *ffl,
 				  struct file_lock *fl)
 {
 	switch (ffl->type) {
@@ -2076,7 +2077,14 @@ static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
 
 		fl->fl_start = ffl->start;
 		fl->fl_end = ffl->end;
-		fl->fl_pid = ffl->pid;
+
+		/*
+		 * Convert pid into the caller's pid namespace. If the pid
+		 * does not map into the namespace fl_pid will get set to 0.
+		 */
+		rcu_read_lock();
+		fl->fl_pid = pid_vnr(find_pid_ns(ffl->pid, fc->pid_ns));
+		rcu_read_unlock();
 		break;
 
 	default:
@@ -2125,7 +2133,7 @@ static int fuse_getlk(struct file *file, struct file_lock *fl)
 	args.out.args[0].value = &outarg;
 	err = fuse_simple_request(fc, &args);
 	if (!err)
-		err = convert_fuse_file_lock(&outarg.lk, fl);
+		err = convert_fuse_file_lock(fc, &outarg.lk, fl);
 
 	return err;
 }
@@ -2137,7 +2145,8 @@ static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
 	FUSE_ARGS(args);
 	struct fuse_lk_in inarg;
 	int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
-	pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
+	struct pid *pid = fl->fl_type != F_UNLCK ? task_tgid(current) : NULL;
+	pid_t pid_nr = pid_nr_ns(pid, fc->pid_ns);
 	int err;
 
 	if (fl->fl_lmops && fl->fl_lmops->lm_grant) {
@@ -2149,7 +2158,10 @@ static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
 	if (fl->fl_flags & FL_CLOSE)
 		return 0;
 
-	fuse_lk_fill(&args, file, fl, opcode, pid, flock, &inarg);
+	if (pid && pid_nr == 0)
+		return -EOVERFLOW;
+
+	fuse_lk_fill(&args, file, fl, opcode, pid_nr, flock, &inarg);
 	err = fuse_simple_request(fc, &args);
 
 	/* locking is restartable */
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 405113101db8..143b595197b6 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -22,6 +22,7 @@
 #include <linux/rbtree.h>
 #include <linux/poll.h>
 #include <linux/workqueue.h>
+#include <linux/pid_namespace.h>
 
 /** Max number of pages that can be used in a single read request */
 #define FUSE_MAX_PAGES_PER_REQ 32
@@ -456,6 +457,9 @@ struct fuse_conn {
 	/** The group id for this mount */
 	kgid_t group_id;
 
+	/** The pid namespace for this mount */
+	struct pid_namespace *pid_ns;
+
 	/** The fuse mount flags for this mount */
 	unsigned flags;
 
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 2913db2a5b99..2f31874ea9db 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -20,6 +20,7 @@
 #include <linux/random.h>
 #include <linux/sched.h>
 #include <linux/exportfs.h>
+#include <linux/pid_namespace.h>
 
 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
 MODULE_DESCRIPTION("Filesystem in Userspace");
@@ -609,6 +610,7 @@ void fuse_conn_init(struct fuse_conn *fc)
 	fc->connected = 1;
 	fc->attr_version = 1;
 	get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
+	fc->pid_ns = get_pid_ns(task_active_pid_ns(current));
 }
 EXPORT_SYMBOL_GPL(fuse_conn_init);
 
@@ -617,6 +619,7 @@ void fuse_conn_put(struct fuse_conn *fc)
 	if (atomic_dec_and_test(&fc->count)) {
 		if (fc->destroy_req)
 			fuse_request_free(fc->destroy_req);
+		put_pid_ns(fc->pid_ns);
 		fc->release(fc);
 	}
 }
-- 
1.9.1

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#1285952 — [PATCH v2 13/18] fs: Allow superblock owner to access do_remount_sb()

Superblock level remounts are currently restricted to global
CAP_SYS_ADMIN, as is the path for changing the root mount to
read only on umount. Loosen both of these permission checks to
also allow CAP_SYS_ADMIN in any namespace which is privileged
towards the userns which originally mounted the filesystem.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
---
 fs/namespace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 18fc58760aec..b00a765895e7 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1510,7 +1510,7 @@ static int do_umount(struct mount *mnt, int flags)
 		 * Special case for "unmounting" root ...
 		 * we just try to remount it readonly.
 		 */
-		if (!capable(CAP_SYS_ADMIN))
+		if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
 			return -EPERM;
 		down_write(&sb->s_umount);
 		if (!(sb->s_flags & MS_RDONLY))
@@ -2199,7 +2199,7 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
 	down_write(&sb->s_umount);
 	if (flags & MS_BIND)
 		err = change_mount_flags(path->mnt, flags);
-	else if (!capable(CAP_SYS_ADMIN))
+	else if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
 		err = -EPERM;
 	else
 		err = do_remount_sb(sb, flags, data, 0);
-- 
1.9.1

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#1285954 — [PATCH v2 17/18] fuse: Restrict allow_other to the superblock's namespace or a descendant

Unprivileged users are normally restricted from mounting with the
allow_other option by system policy, but this could be bypassed
for a mount done with user namespace root permissions. In such
cases allow_other should not allow users outside the userns
to access the mount as doing so would give the unprivileged user
the ability to manipulate processes it would otherwise be unable
to manipulate. Restrict allow_other to apply to users in the same
userns used at mount or a descendant of that namespace.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
---
 fs/fuse/dir.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 8fd9fe4dcd43..24e4cdb554f1 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1015,7 +1015,7 @@ int fuse_allow_current_process(struct fuse_conn *fc)
 	const struct cred *cred;
 
 	if (fc->flags & FUSE_ALLOW_OTHER)
-		return 1;
+		return current_in_userns(fc->user_ns);
 
 	cred = current_cred();
 	if (uid_eq(cred->euid, fc->user_id) &&
-- 
1.9.1

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#1285956 — [PATCH v2 10/18] fs: Update posix_acl support to handle user namespace mounts

ids in on-disk ACLs should be converted to s_user_ns instead of
init_user_ns as is done now. This introduces the possibility for
id mappings to fail, and when this happens syscalls will return
EOVERFLOW.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
---
 fs/posix_acl.c                  | 67 ++++++++++++++++++++++++++---------------
 fs/xattr.c                      | 19 +++++++++---
 include/linux/posix_acl_xattr.h | 17 ++++++++---
 3 files changed, 70 insertions(+), 33 deletions(-)

diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 4adde1e2cbec..a29442eb4af8 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -595,59 +595,77 @@ EXPORT_SYMBOL_GPL(posix_acl_create);
 /*
  * Fix up the uids and gids in posix acl extended attributes in place.
  */
-static void posix_acl_fix_xattr_userns(
+static int posix_acl_fix_xattr_userns(
 	struct user_namespace *to, struct user_namespace *from,
 	void *value, size_t size)
 {
 	posix_acl_xattr_header *header = (posix_acl_xattr_header *)value;
 	posix_acl_xattr_entry *entry = (posix_acl_xattr_entry *)(header+1), *end;
 	int count;
-	kuid_t uid;
-	kgid_t gid;
+	kuid_t kuid;
+	uid_t uid;
+	kgid_t kgid;
+	gid_t gid;
 
 	if (!value)
-		return;
+		return 0;
 	if (size < sizeof(posix_acl_xattr_header))
-		return;
+		return 0;
 	if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
-		return;
+		return 0;
 
 	count = posix_acl_xattr_count(size);
 	if (count < 0)
-		return;
+		return 0;
 	if (count == 0)
-		return;
+		return 0;
 
 	for (end = entry + count; entry != end; entry++) {
 		switch(le16_to_cpu(entry->e_tag)) {
 		case ACL_USER:
-			uid = make_kuid(from, le32_to_cpu(entry->e_id));
-			entry->e_id = cpu_to_le32(from_kuid(to, uid));
+			kuid = make_kuid(from, le32_to_cpu(entry->e_id));
+			if (!uid_valid(kuid))
+				return -EOVERFLOW;
+			uid = from_kuid(to, kuid);
+			if (uid == (uid_t)-1)
+				return -EOVERFLOW;
+			entry->e_id = cpu_to_le32(uid);
 			break;
 		case ACL_GROUP:
-			gid = make_kgid(from, le32_to_cpu(entry->e_id));
-			entry->e_id = cpu_to_le32(from_kgid(to, gid));
+			kgid = make_kgid(from, le32_to_cpu(entry->e_id));
+			if (!gid_valid(kgid))
+				return -EOVERFLOW;
+			gid = from_kgid(to, kgid);
+			if (gid == (gid_t)-1)
+				return -EOVERFLOW;
+			entry->e_id = cpu_to_le32(gid);
 			break;
 		default:
 			break;
 		}
 	}
+
+	return 0;
 }
 
-void posix_acl_fix_xattr_from_user(void *value, size_t size)
+int
+posix_acl_fix_xattr_from_user(struct user_namespace *target_ns, void *value,
+			      size_t size)
 {
-	struct user_namespace *user_ns = current_user_ns();
-	if (user_ns == &init_user_ns)
-		return;
-	posix_acl_fix_xattr_userns(&init_user_ns, user_ns, value, size);
+	struct user_namespace *source_ns = current_user_ns();
+	if (source_ns == target_ns)
+		return 0;
+	return posix_acl_fix_xattr_userns(target_ns, source_ns, value, size);
 }
 
-void posix_acl_fix_xattr_to_user(void *value, size_t size)
+int
+posix_acl_fix_xattr_to_user(struct user_namespace *source_ns, void *value,
+			    size_t size)
 {
-	struct user_namespace *user_ns = current_user_ns();
-	if (user_ns == &init_user_ns)
-		return;
-	posix_acl_fix_xattr_userns(user_ns, &init_user_ns, value, size);
+	struct user_namespace *target_ns = current_user_ns();
+	if (target_ns == source_ns)
+		return 0;
+	return posix_acl_fix_xattr_userns(target_ns, source_ns, value, size);
 }
 
 /*
@@ -782,7 +800,7 @@ posix_acl_xattr_get(const struct xattr_handler *handler,
 	if (acl == NULL)
 		return -ENODATA;
 
-	error = posix_acl_to_xattr(&init_user_ns, acl, value, size);
+	error = posix_acl_to_xattr(dentry->d_sb->s_user_ns, acl, value, size);
 	posix_acl_release(acl);
 
 	return error;
@@ -810,7 +828,8 @@ posix_acl_xattr_set(const struct xattr_handler *handler,
 		return -EPERM;
 
 	if (value) {
-		acl = posix_acl_from_xattr(&init_user_ns, value, size);
+		acl = posix_acl_from_xattr(dentry->d_sb->s_user_ns, value,
+					   size);
 		if (IS_ERR(acl))
 			return PTR_ERR(acl);
 
diff --git a/fs/xattr.c b/fs/xattr.c
index 9b932b95d74e..1268d8d5f74b 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -351,8 +351,12 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
 			goto out;
 		}
 		if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
-		    (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
-			posix_acl_fix_xattr_from_user(kvalue, size);
+		    (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)) {
+			error = posix_acl_fix_xattr_from_user(d->d_sb->s_user_ns,
+							      kvalue, size);
+			if (error)
+				goto out;
+		}
 	}
 
 	error = vfs_setxattr(d, kname, kvalue, size, flags);
@@ -452,9 +456,14 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
 	error = vfs_getxattr(d, kname, kvalue, size);
 	if (error > 0) {
 		if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
-		    (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
-			posix_acl_fix_xattr_to_user(kvalue, size);
-		if (size && copy_to_user(value, kvalue, error))
+		    (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)) {
+			int ret;
+			ret = posix_acl_fix_xattr_to_user(d->d_sb->s_user_ns,
+							  kvalue, size);
+			if (ret)
+				error = ret;
+		}
+		if (error > 0 && size && copy_to_user(value, kvalue, error))
 			error = -EFAULT;
 	} else if (error == -ERANGE && size >= XATTR_SIZE_MAX) {
 		/* The file system tried to returned a value bigger
diff --git a/include/linux/posix_acl_xattr.h b/include/linux/posix_acl_xattr.h
index 6f14ee295822..db63c57357b4 100644
--- a/include/linux/posix_acl_xattr.h
+++ b/include/linux/posix_acl_xattr.h
@@ -53,14 +53,23 @@ posix_acl_xattr_count(size_t size)
 }
 
 #ifdef CONFIG_FS_POSIX_ACL
-void posix_acl_fix_xattr_from_user(void *value, size_t size);
-void posix_acl_fix_xattr_to_user(void *value, size_t size);
+int posix_acl_fix_xattr_from_user(struct user_namespace *target_ns,
+				  void *value, size_t size);
+int posix_acl_fix_xattr_to_user(struct user_namespace *source_ns, void *value,
+				size_t size);
 #else
-static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
+static inline int
+posix_acl_fix_xattr_from_user(struct user_namespace *target_ns, void *value,
+			      size_t size)
 {
+	return 0;
 }
-static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
+
+static inline int
+posix_acl_fix_xattr_to_user(struct user_namespace *source_ns, void *value,
+			    size_t size)
 {
+	return 0;
 }
 #endif
 
-- 
1.9.1

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#1285962 — [PATCH v2 04/18] selinux: Add support for unprivileged mounts from user namespaces

Security labels from unprivileged mounts in user namespaces must
be ignored. Force superblocks from user namespaces whose labeling
behavior is to use xattrs to use mountpoint labeling instead.
For the mountpoint label, default to converting the current task
context into a form suitable for file objects, but also allow the
policy writer to specify a different label through policy
transition rules.

Pieced together from code snippets provided by Stephen Smalley.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: James Morris <james.l.morris@oracle.com>
---
 security/selinux/hooks.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index a5b93df6553f..5fedc36dd6b2 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -756,6 +756,28 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 			goto out;
 		}
 	}
+
+	/*
+	 * If this is a user namespace mount, no contexts are allowed
+	 * on the command line and security labels must be ignored.
+	 */
+	if (sb->s_user_ns != &init_user_ns) {
+		if (context_sid || fscontext_sid || rootcontext_sid ||
+		    defcontext_sid) {
+			rc = -EACCES;
+			goto out;
+		}
+		if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
+			sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
+			rc = security_transition_sid(current_sid(), current_sid(),
+						     SECCLASS_FILE, NULL,
+						     &sbsec->mntpoint_sid);
+			if (rc)
+				goto out;
+		}
+		goto out_set_opts;
+	}
+
 	/* sets the context of the superblock for the fs being mounted. */
 	if (fscontext_sid) {
 		rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred);
@@ -824,6 +846,7 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 		sbsec->def_sid = defcontext_sid;
 	}
 
+out_set_opts:
 	rc = sb_finish_set_opts(sb);
 out:
 	mutex_unlock(&sbsec->lock);
-- 
1.9.1

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#1285963 — [PATCH v2 05/18] userns: Replace in_userns with current_in_userns

All current callers of in_userns pass current_user_ns as the
first argument. Simplify by replacing in_userns with
current_in_userns which checks whether current_user_ns is in the
namespace supplied as an argument.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
---
 fs/namespace.c                 | 2 +-
 include/linux/user_namespace.h | 6 ++----
 kernel/user_namespace.c        | 6 +++---
 security/commoncap.c           | 2 +-
 4 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 2101ce7b96ab..18fc58760aec 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3286,7 +3286,7 @@ bool mnt_may_suid(struct vfsmount *mnt)
 	 * in other namespaces.
 	 */
 	return !(mnt->mnt_flags & MNT_NOSUID) && check_mnt(real_mount(mnt)) &&
-	       in_userns(current_user_ns(), mnt->mnt_sb->s_user_ns);
+	       current_in_userns(mnt->mnt_sb->s_user_ns);
 }
 
 static struct ns_common *mntns_get(struct task_struct *task)
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index a43faa727124..9217169c64cb 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -72,8 +72,7 @@ extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t,
 extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *);
 extern int proc_setgroups_show(struct seq_file *m, void *v);
 extern bool userns_may_setgroups(const struct user_namespace *ns);
-extern bool in_userns(const struct user_namespace *ns,
-		      const struct user_namespace *target_ns);
+extern bool current_in_userns(const struct user_namespace *target_ns);
 #else
 
 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
@@ -103,8 +102,7 @@ static inline bool userns_may_setgroups(const struct user_namespace *ns)
 	return true;
 }
 
-static inline bool in_userns(const struct user_namespace *ns,
-			     const struct user_namespace *target_ns)
+static inline bool current_in_userns(const struct user_namespace *target_ns)
 {
 	return true;
 }
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 69fbc377357b..5960edc7e644 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -949,10 +949,10 @@ bool userns_may_setgroups(const struct user_namespace *ns)
  * Returns true if @ns is the same namespace as or a descendant of
  * @target_ns.
  */
-bool in_userns(const struct user_namespace *ns,
-	       const struct user_namespace *target_ns)
+bool current_in_userns(const struct user_namespace *target_ns)
 {
-	for (; ns; ns = ns->parent) {
+	struct user_namespace *ns;
+	for (ns = current_user_ns(); ns; ns = ns->parent) {
 		if (ns == target_ns)
 			return true;
 	}
diff --git a/security/commoncap.c b/security/commoncap.c
index 6243aef5860e..2119421613f6 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -450,7 +450,7 @@ static int get_file_caps(struct linux_binprm *bprm, bool *effective, bool *has_c
 
 	if (!mnt_may_suid(bprm->file->f_path.mnt))
 		return 0;
-	if (!in_userns(current_user_ns(), bprm->file->f_path.mnt->mnt_sb->s_user_ns))
+	if (!current_in_userns(bprm->file->f_path.mnt->mnt_sb->s_user_ns))
 		return 0;
 
 	rc = get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps);
-- 
1.9.1

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#1285965 — [PATCH v2 09/18] fs: Refuse uid/gid changes which don't map into s_user_ns

Add checks to inode_change_ok to verify that uid and gid changes
will map into the superblock's user namespace. If they do not
fail with -EOVERFLOW. This cannot be overriden with ATTR_FORCE.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
---
 fs/attr.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/fs/attr.c b/fs/attr.c
index 6530ced19697..55b46e3aa888 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -42,6 +42,17 @@ int inode_change_ok(const struct inode *inode, struct iattr *attr)
 			return error;
 	}
 
+	/*
+	 * Verify that uid/gid changes are valid in the target namespace
+	 * of the superblock. This cannot be overriden using ATTR_FORCE.
+	 */
+	if (ia_valid & ATTR_UID &&
+	    from_kuid(inode->i_sb->s_user_ns, attr->ia_uid) == (uid_t)-1)
+		return -EOVERFLOW;
+	if (ia_valid & ATTR_GID &&
+	    from_kgid(inode->i_sb->s_user_ns, attr->ia_gid) == (gid_t)-1)
+		return -EOVERFLOW;
+
 	/* If force is set do it anyway. */
 	if (ia_valid & ATTR_FORCE)
 		return 0;
-- 
1.9.1

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#1285967 — [PATCH v2 06/18] Smack: Handle labels consistently in untrusted mounts

The SMACK64, SMACK64EXEC, and SMACK64MMAP labels are all handled
differently in untrusted mounts. This is confusing and
potentically problematic. Change this to handle them all the same
way that SMACK64 is currently handled; that is, read the label
from disk and check it at use time. For SMACK64 and SMACK64MMAP
access is denied if the label does not match smk_root. To be
consistent with suid, a SMACK64EXEC label which does not match
smk_root will still allow execution of the file but will not run
with the label supplied in the xattr.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
---
 security/smack/smack_lsm.c | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 16cac04214e2..0e555f64ded0 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -921,6 +921,7 @@ static int smack_bprm_set_creds(struct linux_binprm *bprm)
 	struct inode *inode = file_inode(bprm->file);
 	struct task_smack *bsp = bprm->cred->security;
 	struct inode_smack *isp;
+	struct superblock_smack *sbsp;
 	int rc;
 
 	if (bprm->cred_prepared)
@@ -930,6 +931,11 @@ static int smack_bprm_set_creds(struct linux_binprm *bprm)
 	if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
 		return 0;
 
+	sbsp = inode->i_sb->s_security;
+	if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) &&
+	    isp->smk_task != sbsp->smk_root)
+		return 0;
+
 	if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
 		struct task_struct *tracer;
 		rc = 0;
@@ -1733,6 +1739,7 @@ static int smack_mmap_file(struct file *file,
 	struct task_smack *tsp;
 	struct smack_known *okp;
 	struct inode_smack *isp;
+	struct superblock_smack *sbsp;
 	int may;
 	int mmay;
 	int tmay;
@@ -1744,6 +1751,10 @@ static int smack_mmap_file(struct file *file,
 	isp = file_inode(file)->i_security;
 	if (isp->smk_mmap == NULL)
 		return 0;
+	sbsp = file_inode(file)->i_sb->s_security;
+	if (sbsp->smk_flags & SMK_SB_UNTRUSTED &&
+	    isp->smk_mmap != sbsp->smk_root)
+		return -EACCES;
 	mkp = isp->smk_mmap;
 
 	tsp = current_security();
@@ -3532,16 +3543,14 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
 			if (rc >= 0)
 				transflag = SMK_INODE_TRANSMUTE;
 		}
-		if (!(sbsp->smk_flags & SMK_SB_UNTRUSTED)) {
-			/*
-			 * Don't let the exec or mmap label be "*" or "@".
-			 */
-			skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
-			if (IS_ERR(skp) || skp == &smack_known_star ||
-			    skp == &smack_known_web)
-				skp = NULL;
-			isp->smk_task = skp;
-		}
+		/*
+		 * Don't let the exec or mmap label be "*" or "@".
+		 */
+		skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
+		if (IS_ERR(skp) || skp == &smack_known_star ||
+		    skp == &smack_known_web)
+			skp = NULL;
+		isp->smk_task = skp;
 
 		skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
 		if (IS_ERR(skp) || skp == &smack_known_star ||
-- 
1.9.1

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#1285969 — [PATCH v2 01/18] block_dev: Support checking inode permissions in lookup_bdev()

When looking up a block device by path no permission check is
done to verify that the user has access to the block device inode
at the specified path. In some cases it may be necessary to
check permissions towards the inode, such as allowing
unprivileged users to mount block devices in user namespaces.

Add an argument to lookup_bdev() to optionally perform this
permission check. A value of 0 skips the permission check and
behaves the same as before. A non-zero value specifies the mask
of access rights required towards the inode at the specified
path. The check is always skipped if the user has CAP_SYS_ADMIN.

All callers of lookup_bdev() currently pass a mask of 0, so this
patch results in no functional change. Subsequent patches will
add permission checks where appropriate.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
---
 drivers/md/bcache/super.c |  2 +-
 drivers/md/dm-table.c     |  2 +-
 drivers/mtd/mtdsuper.c    |  2 +-
 fs/block_dev.c            | 13 ++++++++++---
 fs/quota/quota.c          |  2 +-
 include/linux/fs.h        |  2 +-
 6 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 679a093a3bf6..e8287b0d1dac 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1926,7 +1926,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
 				  sb);
 	if (IS_ERR(bdev)) {
 		if (bdev == ERR_PTR(-EBUSY)) {
-			bdev = lookup_bdev(strim(path));
+			bdev = lookup_bdev(strim(path), 0);
 			mutex_lock(&bch_register_lock);
 			if (!IS_ERR(bdev) && bch_is_open(bdev))
 				err = "device already registered";
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 061152a43730..81c60b2495ed 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -380,7 +380,7 @@ int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
 	BUG_ON(!t);
 
 	/* convert the path to a device */
-	bdev = lookup_bdev(path);
+	bdev = lookup_bdev(path, 0);
 	if (IS_ERR(bdev)) {
 		dev = name_to_dev_t(path);
 		if (!dev)
diff --git a/drivers/mtd/mtdsuper.c b/drivers/mtd/mtdsuper.c
index 20c02a3b7417..b5b60e1af31c 100644
--- a/drivers/mtd/mtdsuper.c
+++ b/drivers/mtd/mtdsuper.c
@@ -176,7 +176,7 @@ struct dentry *mount_mtd(struct file_system_type *fs_type, int flags,
 	/* try the old way - the hack where we allowed users to mount
 	 * /dev/mtdblock$(n) but didn't actually _use_ the blockdev
 	 */
-	bdev = lookup_bdev(dev_name);
+	bdev = lookup_bdev(dev_name, 0);
 	if (IS_ERR(bdev)) {
 		ret = PTR_ERR(bdev);
 		pr_debug("MTDSB: lookup_bdev() returned %d\n", ret);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index f90d91efa1b4..3ebbde85d898 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1426,7 +1426,7 @@ struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
 	struct block_device *bdev;
 	int err;
 
-	bdev = lookup_bdev(path);
+	bdev = lookup_bdev(path, 0);
 	if (IS_ERR(bdev))
 		return bdev;
 
@@ -1736,12 +1736,14 @@ EXPORT_SYMBOL(ioctl_by_bdev);
 /**
  * lookup_bdev  - lookup a struct block_device by name
  * @pathname:	special file representing the block device
+ * @mask:	rights to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC)
  *
  * Get a reference to the blockdevice at @pathname in the current
  * namespace if possible and return it.  Return ERR_PTR(error)
- * otherwise.
+ * otherwise.  If @mask is non-zero, check for access rights to the
+ * inode at @pathname.
  */
-struct block_device *lookup_bdev(const char *pathname)
+struct block_device *lookup_bdev(const char *pathname, int mask)
 {
 	struct block_device *bdev;
 	struct inode *inode;
@@ -1756,6 +1758,11 @@ struct block_device *lookup_bdev(const char *pathname)
 		return ERR_PTR(error);
 
 	inode = d_backing_inode(path.dentry);
+	if (mask != 0 && !capable(CAP_SYS_ADMIN)) {
+		error = __inode_permission(inode, mask);
+		if (error)
+			goto fail;
+	}
 	error = -ENOTBLK;
 	if (!S_ISBLK(inode->i_mode))
 		goto fail;
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 3746367098fd..a40eaecbd5cc 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -733,7 +733,7 @@ static struct super_block *quotactl_block(const char __user *special, int cmd)
 
 	if (IS_ERR(tmp))
 		return ERR_CAST(tmp);
-	bdev = lookup_bdev(tmp->name);
+	bdev = lookup_bdev(tmp->name, 0);
 	putname(tmp);
 	if (IS_ERR(bdev))
 		return ERR_CAST(bdev);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8a17c5649ef2..879ec382fd88 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2373,7 +2373,7 @@ static inline void unregister_chrdev(unsigned int major, const char *name)
 #define BLKDEV_MAJOR_HASH_SIZE	255
 extern const char *__bdevname(dev_t, char *buffer);
 extern const char *bdevname(struct block_device *bdev, char *buffer);
-extern struct block_device *lookup_bdev(const char *);
+extern struct block_device *lookup_bdev(const char *, int mask);
 extern void blkdev_show(struct seq_file *,off_t);
 
 #else
-- 
1.9.1

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#1285976 — [PATCH v2 02/18] block_dev: Check permissions towards block device inode when mounting

Unprivileged users should not be able to mount block devices when
they lack sufficient privileges towards the block device inode.
Update blkdev_get_by_path() to validate that the user has the
required access to the inode at the specified path. The check
will be skipped for CAP_SYS_ADMIN, so privileged mounts will
continue working as before.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
---
 fs/block_dev.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 3ebbde85d898..4fdb6ab59816 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1424,9 +1424,14 @@ struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
 					void *holder)
 {
 	struct block_device *bdev;
+	int perm = 0;
 	int err;
 
-	bdev = lookup_bdev(path, 0);
+	if (mode & FMODE_READ)
+		perm |= MAY_READ;
+	if (mode & FMODE_WRITE)
+		perm |= MAY_WRITE;
+	bdev = lookup_bdev(path, perm);
 	if (IS_ERR(bdev))
 		return bdev;
 
-- 
1.9.1

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