From: Christian Brauner <christian.brauner@ubuntu.com> To: Alexander Viro <viro@zeniv.linux.org.uk>, Christoph Hellwig <hch@infradead.org>, linux-fsdevel@vger.kernel.org Cc: Lennart Poettering <lennart@poettering.net>, Mimi Zohar <zohar@linux.ibm.com>, James Bottomley <James.Bottomley@hansenpartnership.com>, Andreas Dilger <adilger.kernel@dilger.ca>, containers@lists.linux-foundation.org, Christoph Hellwig <hch@lst.de>, Tycho Andersen <tycho@tycho.ws>, Paul Moore <paul@paul-moore.com>, Jonathan Corbet <corbet@lwn.net>, smbarber@chromium.org, linux-ext4@vger.kernel.org, Mrunal Patel <mpatel@redhat.com>, Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>, selinux@vger.kernel.org, Josh Triplett <josh@joshtriplett.org>, Seth Forshee <seth.forshee@canonical.com>, Aleksa Sarai <cyphar@cyphar.com>, Andy Lutomirski <luto@kernel.org>, OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>, Geoffrey Thomas <geofft@ldpreload.com>, David Howells <dhowells@redhat.com>, John Johansen <john.johansen@canonical.com>, Theodore Tso <tytso@mit.edu>, Dmitry Kasatkin <dmitry.kasatkin@gmail.com>, Stephen Smalley <stephen.smalley.work@gmail.com>, linux-xfs@vger.kernel.org, linux-security-module@vger.kernel.org, "Eric W. Biederman" <ebiederm@xmission.com>, linux-api@vger.kernel.org, Casey Schaufler <casey@schaufler-ca.com>, Alban Crequy <alban@kinvolk.io>, linux-integrity@vger.kernel.org, Linus Torvalds <torvalds@linux-foundation.org>, Todd Kjos <tkjos@google.com> Subject: [PATCH v5 08/42] fs: add id translation helpers Date: Tue, 12 Jan 2021 23:00:50 +0100 [thread overview] Message-ID: <20210112220124.837960-9-christian.brauner@ubuntu.com> (raw) In-Reply-To: <20210112220124.837960-1-christian.brauner@ubuntu.com> Add simple helpers to make it easy to map kuids into and from idmapped mounts. We provide simple wrappers that filesystems can use to e.g. initialize inodes similar to i_{uid,gid}_read() and i_{uid,gid}_write(). Accessing an inode through an idmapped mount will require the inode to be mapped according to the mount's user namespace. If the fsids are used to compare against inodes or to initialize inodes they are required to be shifted from the mount's user namespace. Passing the initial user namespace to these helpers makes them a nop and so any non-idmapped paths will not be impacted. Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> --- /* v2 */ - Christoph Hellwig <hch@lst.de>: - Get rid of the ifdefs and the config option that hid idmapped mounts. /* v3 */ unchanged /* v4 */ - Serge Hallyn <serge@hallyn.com>: - Use "mnt_userns" to refer to a vfsmount's userns everywhere to make terminology consistent. /* v5 */ base-commit: 7c53f6b671f4aba70ff15e1b05148b10d58c2837 --- include/linux/fs.h | 47 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/include/linux/fs.h b/include/linux/fs.h index fd47deea7c17..1da4c21fb588 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -39,6 +39,7 @@ #include <linux/fs_types.h> #include <linux/build_bug.h> #include <linux/stddef.h> +#include <linux/cred.h> #include <asm/byteorder.h> #include <uapi/linux/fs.h> @@ -1572,6 +1573,52 @@ static inline void i_gid_write(struct inode *inode, gid_t gid) inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid); } +static inline kuid_t kuid_into_mnt(struct user_namespace *mnt_userns, + kuid_t kuid) +{ + return make_kuid(mnt_userns, __kuid_val(kuid)); +} + +static inline kgid_t kgid_into_mnt(struct user_namespace *mnt_userns, + kgid_t kgid) +{ + return make_kgid(mnt_userns, __kgid_val(kgid)); +} + +static inline kuid_t i_uid_into_mnt(struct user_namespace *mnt_userns, + const struct inode *inode) +{ + return kuid_into_mnt(mnt_userns, inode->i_uid); +} + +static inline kgid_t i_gid_into_mnt(struct user_namespace *mnt_userns, + const struct inode *inode) +{ + return kgid_into_mnt(mnt_userns, inode->i_gid); +} + +static inline kuid_t kuid_from_mnt(struct user_namespace *mnt_userns, + kuid_t kuid) +{ + return KUIDT_INIT(from_kuid(mnt_userns, kuid)); +} + +static inline kgid_t kgid_from_mnt(struct user_namespace *mnt_userns, + kgid_t kgid) +{ + return KGIDT_INIT(from_kgid(mnt_userns, kgid)); +} + +static inline kuid_t fsuid_into_mnt(struct user_namespace *mnt_userns) +{ + return kuid_from_mnt(mnt_userns, current_fsuid()); +} + +static inline kgid_t fsgid_into_mnt(struct user_namespace *mnt_userns) +{ + return kgid_from_mnt(mnt_userns, current_fsgid()); +} + extern struct timespec64 current_time(struct inode *inode); /* -- 2.30.0 _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/containers
WARNING: multiple messages have this Message-ID (diff)
From: Christian Brauner <christian.brauner@ubuntu.com> To: Alexander Viro <viro@zeniv.linux.org.uk>, Christoph Hellwig <hch@infradead.org>, linux-fsdevel@vger.kernel.org Cc: "John Johansen" <john.johansen@canonical.com>, "James Morris" <jmorris@namei.org>, "Mimi Zohar" <zohar@linux.ibm.com>, "Dmitry Kasatkin" <dmitry.kasatkin@gmail.com>, "Stephen Smalley" <stephen.smalley.work@gmail.com>, "Casey Schaufler" <casey@schaufler-ca.com>, "Arnd Bergmann" <arnd@arndb.de>, "Andreas Dilger" <adilger.kernel@dilger.ca>, "OGAWA Hirofumi" <hirofumi@mail.parknet.co.jp>, "Geoffrey Thomas" <geofft@ldpreload.com>, "Mrunal Patel" <mpatel@redhat.com>, "Josh Triplett" <josh@joshtriplett.org>, "Andy Lutomirski" <luto@kernel.org>, "Theodore Tso" <tytso@mit.edu>, "Alban Crequy" <alban@kinvolk.io>, "Tycho Andersen" <tycho@tycho.ws>, "David Howells" <dhowells@redhat.com>, "James Bottomley" <James.Bottomley@hansenpartnership.com>, "Seth Forshee" <seth.forshee@canonical.com>, "Stéphane Graber" <stgraber@ubuntu.com>, "Linus Torvalds" <torvalds@linux-foundation.org>, "Aleksa Sarai" <cyphar@cyphar.com>, "Lennart Poettering" <lennart@poettering.net>, "Eric W. Biederman" <ebiederm@xmission.com>, smbarber@chromium.org, "Phil Estes" <estesp@gmail.com>, "Serge Hallyn" <serge@hallyn.com>, "Kees Cook" <keescook@chromium.org>, "Todd Kjos" <tkjos@google.com>, "Paul Moore" <paul@paul-moore.com>, "Jonathan Corbet" <corbet@lwn.net>, containers@lists.linux-foundation.org, linux-security-module@vger.kernel.org, linux-api@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-integrity@vger.kernel.org, selinux@vger.kernel.org, "Christian Brauner" <christian.brauner@ubuntu.com>, "Christoph Hellwig" <hch@lst.de> Subject: [PATCH v5 08/42] fs: add id translation helpers Date: Tue, 12 Jan 2021 23:00:50 +0100 [thread overview] Message-ID: <20210112220124.837960-9-christian.brauner@ubuntu.com> (raw) In-Reply-To: <20210112220124.837960-1-christian.brauner@ubuntu.com> Add simple helpers to make it easy to map kuids into and from idmapped mounts. We provide simple wrappers that filesystems can use to e.g. initialize inodes similar to i_{uid,gid}_read() and i_{uid,gid}_write(). Accessing an inode through an idmapped mount will require the inode to be mapped according to the mount's user namespace. If the fsids are used to compare against inodes or to initialize inodes they are required to be shifted from the mount's user namespace. Passing the initial user namespace to these helpers makes them a nop and so any non-idmapped paths will not be impacted. Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> --- /* v2 */ - Christoph Hellwig <hch@lst.de>: - Get rid of the ifdefs and the config option that hid idmapped mounts. /* v3 */ unchanged /* v4 */ - Serge Hallyn <serge@hallyn.com>: - Use "mnt_userns" to refer to a vfsmount's userns everywhere to make terminology consistent. /* v5 */ base-commit: 7c53f6b671f4aba70ff15e1b05148b10d58c2837 --- include/linux/fs.h | 47 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/include/linux/fs.h b/include/linux/fs.h index fd47deea7c17..1da4c21fb588 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -39,6 +39,7 @@ #include <linux/fs_types.h> #include <linux/build_bug.h> #include <linux/stddef.h> +#include <linux/cred.h> #include <asm/byteorder.h> #include <uapi/linux/fs.h> @@ -1572,6 +1573,52 @@ static inline void i_gid_write(struct inode *inode, gid_t gid) inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid); } +static inline kuid_t kuid_into_mnt(struct user_namespace *mnt_userns, + kuid_t kuid) +{ + return make_kuid(mnt_userns, __kuid_val(kuid)); +} + +static inline kgid_t kgid_into_mnt(struct user_namespace *mnt_userns, + kgid_t kgid) +{ + return make_kgid(mnt_userns, __kgid_val(kgid)); +} + +static inline kuid_t i_uid_into_mnt(struct user_namespace *mnt_userns, + const struct inode *inode) +{ + return kuid_into_mnt(mnt_userns, inode->i_uid); +} + +static inline kgid_t i_gid_into_mnt(struct user_namespace *mnt_userns, + const struct inode *inode) +{ + return kgid_into_mnt(mnt_userns, inode->i_gid); +} + +static inline kuid_t kuid_from_mnt(struct user_namespace *mnt_userns, + kuid_t kuid) +{ + return KUIDT_INIT(from_kuid(mnt_userns, kuid)); +} + +static inline kgid_t kgid_from_mnt(struct user_namespace *mnt_userns, + kgid_t kgid) +{ + return KGIDT_INIT(from_kgid(mnt_userns, kgid)); +} + +static inline kuid_t fsuid_into_mnt(struct user_namespace *mnt_userns) +{ + return kuid_from_mnt(mnt_userns, current_fsuid()); +} + +static inline kgid_t fsgid_into_mnt(struct user_namespace *mnt_userns) +{ + return kgid_from_mnt(mnt_userns, current_fsgid()); +} + extern struct timespec64 current_time(struct inode *inode); /* -- 2.30.0
next prev parent reply other threads:[~2021-01-12 22:04 UTC|newest] Thread overview: 164+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-12 22:00 [PATCH v5 00/42] idmapped mounts Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-12 22:00 ` [PATCH v5 01/42] namespace: take lock_mount_hash() directly when changing flags Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-12 22:00 ` [PATCH v5 02/42] mount: make {lock,unlock}_mount_hash() static Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-12 22:00 ` [PATCH v5 03/42] namespace: only take read lock in do_reconfigure_mnt() Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-12 22:00 ` [PATCH v5 04/42] fs: split out functions to hold writers Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-12 22:00 ` [PATCH v5 05/42] fs: add attr_flags_to_mnt_flags helper Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-12 22:00 ` [PATCH v5 06/42] fs: add mount_setattr() Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-12 22:00 ` [PATCH v5 07/42] tests: add mount_setattr() selftests Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-12 22:00 ` Christian Brauner [this message] 2021-01-12 22:00 ` [PATCH v5 08/42] fs: add id translation helpers Christian Brauner 2021-01-12 22:00 ` [PATCH v5 09/42] mount: attach mappings to mounts Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-19 9:20 ` Christoph Hellwig 2021-01-19 9:20 ` Christoph Hellwig 2021-01-12 22:00 ` [PATCH v5 10/42] capability: handle idmapped mounts Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-19 9:22 ` Christoph Hellwig 2021-01-19 9:22 ` Christoph Hellwig 2021-01-12 22:00 ` [PATCH v5 11/42] namei: make permission helpers idmapped mount aware Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-19 9:23 ` Christoph Hellwig 2021-01-19 9:23 ` Christoph Hellwig 2021-01-12 22:00 ` [PATCH v5 12/42] inode: make init and " Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-19 9:24 ` Christoph Hellwig 2021-01-19 9:24 ` Christoph Hellwig 2021-01-12 22:00 ` [PATCH v5 13/42] attr: handle idmapped mounts Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-19 9:25 ` Christoph Hellwig 2021-01-19 9:25 ` Christoph Hellwig 2021-01-12 22:00 ` [PATCH v5 14/42] acl: " Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-19 9:26 ` Christoph Hellwig 2021-01-19 9:26 ` Christoph Hellwig 2021-01-12 22:00 ` [PATCH v5 15/42] fs: add file_user_ns() helper Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-19 9:27 ` Christoph Hellwig 2021-01-19 9:27 ` Christoph Hellwig 2021-01-19 15:05 ` Jann Horn via Containers 2021-01-19 15:05 ` Jann Horn 2021-01-20 12:03 ` Christian Brauner 2021-01-20 12:03 ` Christian Brauner 2021-01-12 22:00 ` [PATCH v5 16/42] xattr: handle idmapped mounts Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-19 9:31 ` Christoph Hellwig 2021-01-19 9:31 ` Christoph Hellwig 2021-01-12 22:00 ` [PATCH v5 17/42] commoncap: " Christian Brauner 2021-01-12 22:00 ` Christian Brauner 2021-01-19 9:31 ` Christoph Hellwig 2021-01-19 9:31 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 18/42] stat: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:32 ` Christoph Hellwig 2021-01-19 9:32 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 19/42] namei: handle idmapped mounts in may_*() helpers Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:33 ` Christoph Hellwig 2021-01-19 9:33 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 20/42] namei: introduce struct renamedata Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:34 ` Christoph Hellwig 2021-01-19 9:34 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 21/42] namei: prepare for idmapped mounts Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:34 ` Christoph Hellwig 2021-01-19 9:34 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 22/42] open: handle idmapped mounts in do_truncate() Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:37 ` Christoph Hellwig 2021-01-19 9:37 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 23/42] open: handle idmapped mounts Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:38 ` Christoph Hellwig 2021-01-19 9:38 ` Christoph Hellwig 2021-01-19 14:57 ` Christian Brauner 2021-01-19 14:57 ` Christian Brauner 2021-01-12 22:01 ` [PATCH v5 24/42] af_unix: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:39 ` Christoph Hellwig 2021-01-19 9:39 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 25/42] utimes: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:40 ` Christoph Hellwig 2021-01-19 9:40 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 26/42] fcntl: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:41 ` Christoph Hellwig 2021-01-19 9:41 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 27/42] notify: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:42 ` Christoph Hellwig 2021-01-19 9:42 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 28/42] init: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-12 22:01 ` [PATCH v5 29/42] ioctl: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:44 ` Christoph Hellwig 2021-01-19 9:44 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 30/42] would_dump: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:44 ` Christoph Hellwig 2021-01-19 9:44 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 31/42] exec: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:45 ` Christoph Hellwig 2021-01-19 9:45 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 32/42] fs: make helpers idmap mount aware Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:45 ` Christoph Hellwig 2021-01-19 9:45 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 33/42] apparmor: handle idmapped mounts Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-12 22:01 ` [PATCH v5 34/42] ima: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-12 22:01 ` [PATCH v5 35/42] fat: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-12 22:01 ` [PATCH v5 36/42] ext4: support " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-12 22:01 ` [PATCH v5 37/42] xfs: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-14 20:51 ` Dave Chinner 2021-01-14 20:51 ` Dave Chinner 2021-01-14 22:10 ` Christian Brauner 2021-01-14 22:10 ` Christian Brauner 2021-01-17 21:06 ` Dave Chinner 2021-01-17 21:06 ` Dave Chinner 2021-01-15 16:22 ` Christoph Hellwig 2021-01-15 16:22 ` Christoph Hellwig 2021-01-12 22:01 ` [PATCH v5 38/42] ecryptfs: do not mount on top of " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-12 22:01 ` [PATCH v5 39/42] overlayfs: " Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-12 22:01 ` [PATCH v5 40/42] fs: introduce MOUNT_ATTR_IDMAP Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-19 9:47 ` Christoph Hellwig 2021-01-19 9:47 ` Christoph Hellwig 2021-01-19 11:43 ` Christian Brauner 2021-01-19 11:43 ` Christian Brauner 2021-01-12 22:01 ` [PATCH v5 41/42] tests: extend mount_setattr tests Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-13 0:32 ` Randy Dunlap 2021-01-13 0:32 ` Randy Dunlap 2021-01-12 22:01 ` [PATCH v5 42/42] generic/622: add fstests for idmapped mounts Christian Brauner 2021-01-12 22:01 ` Christian Brauner 2021-01-14 17:12 ` [PATCH v5 00/42] " Darrick J. Wong 2021-01-14 17:12 ` Darrick J. Wong 2021-01-14 17:54 ` Christian Brauner 2021-01-14 17:54 ` Christian Brauner 2021-01-14 20:43 ` Dave Chinner 2021-01-14 20:43 ` Dave Chinner 2021-01-15 16:24 ` Christoph Hellwig 2021-01-15 16:24 ` Christoph Hellwig 2021-01-15 17:51 ` Theodore Ts'o 2021-01-15 17:51 ` Theodore Ts'o 2021-01-16 0:27 ` Christian Brauner 2021-01-16 0:27 ` Christian Brauner
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