From: Linus Torvalds Date: Tue, 23 Feb 2021 21:39:45 +0000 (-0800) Subject: Merge tag 'idmapped-mounts-v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git... X-Git-Tag: v5.12-rc1~64 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7d6beb71da3cc033649d641e1e608713b8220290;p=thirdparty%2Fkernel%2Flinux.git Merge tag 'idmapped-mounts-v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux Pull idmapped mounts from Christian Brauner: "This introduces idmapped mounts which has been in the making for some time. Simply put, different mounts can expose the same file or directory with different ownership. This initial implementation comes with ports for fat, ext4 and with Christoph's port for xfs with more filesystems being actively worked on by independent people and maintainers. Idmapping mounts handle a wide range of long standing use-cases. Here are just a few: - Idmapped mounts make it possible to easily share files between multiple users or multiple machines especially in complex scenarios. For example, idmapped mounts will be used in the implementation of portable home directories in systemd-homed.service(8) where they allow users to move their home directory to an external storage device and use it on multiple computers where they are assigned different uids and gids. This effectively makes it possible to assign random uids and gids at login time. - It is possible to share files from the host with unprivileged containers without having to change ownership permanently through chown(2). - It is possible to idmap a container's rootfs and without having to mangle every file. For example, Chromebooks use it to share the user's Download folder with their unprivileged containers in their Linux subsystem. - It is possible to share files between containers with non-overlapping idmappings. - Filesystem that lack a proper concept of ownership such as fat can use idmapped mounts to implement discretionary access (DAC) permission checking. - They allow users to efficiently changing ownership on a per-mount basis without having to (recursively) chown(2) all files. In contrast to chown (2) changing ownership of large sets of files is instantenous with idmapped mounts. This is especially useful when ownership of a whole root filesystem of a virtual machine or container is changed. With idmapped mounts a single syscall mount_setattr syscall will be sufficient to change the ownership of all files. - Idmapped mounts always take the current ownership into account as idmappings specify what a given uid or gid is supposed to be mapped to. This contrasts with the chown(2) syscall which cannot by itself take the current ownership of the files it changes into account. It simply changes the ownership to the specified uid and gid. This is especially problematic when recursively chown(2)ing a large set of files which is commong with the aforementioned portable home directory and container and vm scenario. - Idmapped mounts allow to change ownership locally, restricting it to specific mounts, and temporarily as the ownership changes only apply as long as the mount exists. Several userspace projects have either already put up patches and pull-requests for this feature or will do so should you decide to pull this: - systemd: In a wide variety of scenarios but especially right away in their implementation of portable home directories. https://systemd.io/HOME_DIRECTORY/ - container runtimes: containerd, runC, LXD:To share data between host and unprivileged containers, unprivileged and privileged containers, etc. The pull request for idmapped mounts support in containerd, the default Kubernetes runtime is already up for quite a while now: https://github.com/containerd/containerd/pull/4734 - The virtio-fs developers and several users have expressed interest in using this feature with virtual machines once virtio-fs is ported. - ChromeOS: Sharing host-directories with unprivileged containers. I've tightly synced with all those projects and all of those listed here have also expressed their need/desire for this feature on the mailing list. For more info on how people use this there's a bunch of talks about this too. Here's just two recent ones: https://www.cncf.io/wp-content/uploads/2020/12/Rootless-Containers-in-Gitpod.pdf https://fosdem.org/2021/schedule/event/containers_idmap/ This comes with an extensive xfstests suite covering both ext4 and xfs: https://git.kernel.org/brauner/xfstests-dev/h/idmapped_mounts It covers truncation, creation, opening, xattrs, vfscaps, setid execution, setgid inheritance and more both with idmapped and non-idmapped mounts. It already helped to discover an unrelated xfs setgid inheritance bug which has since been fixed in mainline. It will be sent for inclusion with the xfstests project should you decide to merge this. In order to support per-mount idmappings vfsmounts are marked with user namespaces. The idmapping of the user namespace will be used to map the ids of vfs objects when they are accessed through that mount. By default all vfsmounts are marked with the initial user namespace. The initial user namespace is used to indicate that a mount is not idmapped. All operations behave as before and this is verified in the testsuite. Based on prior discussions we want to attach the whole user namespace and not just a dedicated idmapping struct. This allows us to reuse all the helpers that already exist for dealing with idmappings instead of introducing a whole new range of helpers. In addition, if we decide in the future that we are confident enough to enable unprivileged users to setup idmapped mounts the permission checking can take into account whether the caller is privileged in the user namespace the mount is currently marked with. The user namespace the mount will be marked with can be specified by passing a file descriptor refering to the user namespace as an argument to the new mount_setattr() syscall together with the new MOUNT_ATTR_IDMAP flag. The system call follows the openat2() pattern of extensibility. The following conditions must be met in order to create an idmapped mount: - The caller must currently have the CAP_SYS_ADMIN capability in the user namespace the underlying filesystem has been mounted in. - The underlying filesystem must support idmapped mounts. - The mount must not already be idmapped. This also implies that the idmapping of a mount cannot be altered once it has been idmapped. - The mount must be a detached/anonymous mount, i.e. it must have been created by calling open_tree() with the OPEN_TREE_CLONE flag and it must not already have been visible in the filesystem. The last two points guarantee easier semantics for userspace and the kernel and make the implementation significantly simpler. By default vfsmounts are marked with the initial user namespace and no behavioral or performance changes are observed. The manpage with a detailed description can be found here: https://git.kernel.org/brauner/man-pages/c/1d7b902e2875a1ff342e036a9f866a995640aea8 In order to support idmapped mounts, filesystems need to be changed and mark themselves with the FS_ALLOW_IDMAP flag in fs_flags. The patches to convert individual filesystem are not very large or complicated overall as can be seen from the included fat, ext4, and xfs ports. Patches for other filesystems are actively worked on and will be sent out separately. The xfstestsuite can be used to verify that port has been done correctly. The mount_setattr() syscall is motivated independent of the idmapped mounts patches and it's been around since July 2019. One of the most valuable features of the new mount api is the ability to perform mounts based on file descriptors only. Together with the lookup restrictions available in the openat2() RESOLVE_* flag namespace which we added in v5.6 this is the first time we are close to hardened and race-free (e.g. symlinks) mounting and path resolution. While userspace has started porting to the new mount api to mount proper filesystems and create new bind-mounts it is currently not possible to change mount options of an already existing bind mount in the new mount api since the mount_setattr() syscall is missing. With the addition of the mount_setattr() syscall we remove this last restriction and userspace can now fully port to the new mount api, covering every use-case the old mount api could. We also add the crucial ability to recursively change mount options for a whole mount tree, both removing and adding mount options at the same time. This syscall has been requested multiple times by various people and projects. There is a simple tool available at https://github.com/brauner/mount-idmapped that allows to create idmapped mounts so people can play with this patch series. I'll add support for the regular mount binary should you decide to pull this in the following weeks: Here's an example to a simple idmapped mount of another user's home directory: u1001@f2-vm:/$ sudo ./mount --idmap both:1000:1001:1 /home/ubuntu/ /mnt u1001@f2-vm:/$ ls -al /home/ubuntu/ total 28 drwxr-xr-x 2 ubuntu ubuntu 4096 Oct 28 22:07 . drwxr-xr-x 4 root root 4096 Oct 28 04:00 .. -rw------- 1 ubuntu ubuntu 3154 Oct 28 22:12 .bash_history -rw-r--r-- 1 ubuntu ubuntu 220 Feb 25 2020 .bash_logout -rw-r--r-- 1 ubuntu ubuntu 3771 Feb 25 2020 .bashrc -rw-r--r-- 1 ubuntu ubuntu 807 Feb 25 2020 .profile -rw-r--r-- 1 ubuntu ubuntu 0 Oct 16 16:11 .sudo_as_admin_successful -rw------- 1 ubuntu ubuntu 1144 Oct 28 00:43 .viminfo u1001@f2-vm:/$ ls -al /mnt/ total 28 drwxr-xr-x 2 u1001 u1001 4096 Oct 28 22:07 . drwxr-xr-x 29 root root 4096 Oct 28 22:01 .. -rw------- 1 u1001 u1001 3154 Oct 28 22:12 .bash_history -rw-r--r-- 1 u1001 u1001 220 Feb 25 2020 .bash_logout -rw-r--r-- 1 u1001 u1001 3771 Feb 25 2020 .bashrc -rw-r--r-- 1 u1001 u1001 807 Feb 25 2020 .profile -rw-r--r-- 1 u1001 u1001 0 Oct 16 16:11 .sudo_as_admin_successful -rw------- 1 u1001 u1001 1144 Oct 28 00:43 .viminfo u1001@f2-vm:/$ touch /mnt/my-file u1001@f2-vm:/$ setfacl -m u:1001:rwx /mnt/my-file u1001@f2-vm:/$ sudo setcap -n 1001 cap_net_raw+ep /mnt/my-file u1001@f2-vm:/$ ls -al /mnt/my-file -rw-rwxr--+ 1 u1001 u1001 0 Oct 28 22:14 /mnt/my-file u1001@f2-vm:/$ ls -al /home/ubuntu/my-file -rw-rwxr--+ 1 ubuntu ubuntu 0 Oct 28 22:14 /home/ubuntu/my-file u1001@f2-vm:/$ getfacl /mnt/my-file getfacl: Removing leading '/' from absolute path names # file: mnt/my-file # owner: u1001 # group: u1001 user::rw- user:u1001:rwx group::rw- mask::rwx other::r-- u1001@f2-vm:/$ getfacl /home/ubuntu/my-file getfacl: Removing leading '/' from absolute path names # file: home/ubuntu/my-file # owner: ubuntu # group: ubuntu user::rw- user:ubuntu:rwx group::rw- mask::rwx other::r--" * tag 'idmapped-mounts-v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux: (41 commits) xfs: remove the possibly unused mp variable in xfs_file_compat_ioctl xfs: support idmapped mounts ext4: support idmapped mounts fat: handle idmapped mounts tests: add mount_setattr() selftests fs: introduce MOUNT_ATTR_IDMAP fs: add mount_setattr() fs: add attr_flags_to_mnt_flags helper fs: split out functions to hold writers namespace: only take read lock in do_reconfigure_mnt() mount: make {lock,unlock}_mount_hash() static namespace: take lock_mount_hash() directly when changing flags nfs: do not export idmapped mounts overlayfs: do not mount on top of idmapped mounts ecryptfs: do not mount on top of idmapped mounts ima: handle idmapped mounts apparmor: handle idmapped mounts fs: make helpers idmap mount aware exec: handle idmapped mounts would_dump: handle idmapped mounts ... --- 7d6beb71da3cc033649d641e1e608713b8220290 diff --cc fs/ecryptfs/inode.c index 58d0f71879979,55da9a91f51af..18e9285fbb4c8 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@@ -1024,11 -1043,10 +1045,11 @@@ ecryptfs_setxattr(struct dentry *dentry rc = -EOPNOTSUPP; goto out; } - rc = vfs_setxattr(&init_user_ns, lower_dentry, name, value, size, - flags); + inode_lock(lower_inode); - rc = __vfs_setxattr_locked(lower_dentry, name, value, size, flags, NULL); ++ rc = __vfs_setxattr_locked(&init_user_ns, lower_dentry, name, value, size, flags, NULL); + inode_unlock(lower_inode); if (!rc && inode) - fsstack_copy_attr_all(inode, d_inode(lower_dentry)); + fsstack_copy_attr_all(inode, lower_inode); out: return rc; } diff --cc fs/f2fs/acl.c index 732ec10e78909,a19e86c9adac7..965037a9c205a --- a/fs/f2fs/acl.c +++ b/fs/f2fs/acl.c @@@ -200,27 -200,6 +200,27 @@@ struct posix_acl *f2fs_get_acl(struct i return __f2fs_get_acl(inode, type, NULL); } +static int f2fs_acl_update_mode(struct inode *inode, umode_t *mode_p, + struct posix_acl **acl) +{ + umode_t mode = inode->i_mode; + int error; + + if (is_inode_flag_set(inode, FI_ACL_MODE)) + mode = F2FS_I(inode)->i_acl_mode; + + error = posix_acl_equiv_mode(*acl, &mode); + if (error < 0) + return error; + if (error == 0) + *acl = NULL; - if (!in_group_p(inode->i_gid) && - !capable_wrt_inode_uidgid(inode, CAP_FSETID)) ++ if (!in_group_p(i_gid_into_mnt(&init_user_ns, inode)) && ++ !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID)) + mode &= ~S_ISGID; + *mode_p = mode; + return 0; +} + static int __f2fs_set_acl(struct inode *inode, int type, struct posix_acl *acl, struct page *ipage) { diff --cc fs/f2fs/file.c index 471a6ff0c937a,8f1e97e7d2422..d26ff2ae3f5eb --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@@ -853,9 -848,9 +854,9 @@@ static void __setattr_copy(struct user_ inode->i_ctime = attr->ia_ctime; if (ia_valid & ATTR_MODE) { umode_t mode = attr->ia_mode; + kgid_t kgid = i_gid_into_mnt(mnt_userns, inode); - if (!in_group_p(inode->i_gid) && - !capable_wrt_inode_uidgid(inode, CAP_FSETID)) - if (!in_group_p(kgid) && !capable(CAP_FSETID)) ++ if (!in_group_p(kgid) && !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID)) mode &= ~S_ISGID; set_acl_inode(inode, mode); } @@@ -960,14 -948,13 +962,14 @@@ int f2fs_setattr(struct user_namespace spin_unlock(&F2FS_I(inode)->i_size_lock); } - __setattr_copy(inode, attr); + __setattr_copy(&init_user_ns, inode, attr); if (attr->ia_valid & ATTR_MODE) { - err = posix_acl_chmod(inode, f2fs_get_inode_mode(inode)); - err = posix_acl_chmod(&init_user_ns, inode, - f2fs_get_inode_mode(inode)); - if (err || is_inode_flag_set(inode, FI_ACL_MODE)) { - inode->i_mode = F2FS_I(inode)->i_acl_mode; ++ err = posix_acl_chmod(&init_user_ns, inode, f2fs_get_inode_mode(inode)); + + if (is_inode_flag_set(inode, FI_ACL_MODE)) { + if (!err) + inode->i_mode = F2FS_I(inode)->i_acl_mode; clear_inode_flag(inode, FI_ACL_MODE); } } diff --cc fs/namei.c index de74ad2bc6e28,dbf53b325ac9d..216f16e74351f --- a/fs/namei.c +++ b/fs/namei.c @@@ -1569,14 -1639,18 +1645,15 @@@ static struct dentry *lookup_slow(cons return res; } - static inline int may_lookup(struct nameidata *nd) + static inline int may_lookup(struct user_namespace *mnt_userns, + struct nameidata *nd) { if (nd->flags & LOOKUP_RCU) { - int err = inode_permission(nd->inode, MAY_EXEC|MAY_NOT_BLOCK); - int err = inode_permission(mnt_userns, nd->inode, - MAY_EXEC | MAY_NOT_BLOCK); - if (err != -ECHILD) ++ int err = inode_permission(mnt_userns, nd->inode, MAY_EXEC|MAY_NOT_BLOCK); + if (err != -ECHILD || !try_to_unlazy(nd)) return err; - if (unlazy_walk(nd)) - return -ECHILD; } - return inode_permission(nd->inode, MAY_EXEC); + return inode_permission(mnt_userns, nd->inode, MAY_EXEC); } static int reserve_stack(struct nameidata *nd, struct path *link, unsigned seq) @@@ -3325,9 -3453,11 +3453,9 @@@ static int do_tmpfile(struct nameidata path.dentry = child; audit_inode(nd->name, child, 0); /* Don't check for other permissions, the inode was just created */ - error = may_open(&path, 0, op->open_flag); + error = may_open(mnt_userns, &path, 0, op->open_flag); - if (error) - goto out2; - file->f_path.mnt = path.mnt; - error = finish_open(file, child, NULL); + if (!error) + error = vfs_open(&path, file); out2: mnt_drop_write(path.mnt); out: diff --cc fs/overlayfs/copy_up.c index 0fed532efa68d,f81b836c22563..0b2891c6c71e0 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@@ -84,18 -84,10 +84,18 @@@ int ovl_copy_xattr(struct super_block * if (ovl_is_private_xattr(sb, name)) continue; + + error = security_inode_copy_up_xattr(name); + if (error < 0 && error != -EOPNOTSUPP) + break; + if (error == 1) { + error = 0; + continue; /* Discard */ + } retry: - size = vfs_getxattr(old, name, value, value_size); + size = vfs_getxattr(&init_user_ns, old, name, value, value_size); if (size == -ERANGE) - size = vfs_getxattr(old, name, NULL, 0); + size = vfs_getxattr(&init_user_ns, old, name, NULL, 0); if (size < 0) { error = size; @@@ -115,7 -107,14 +115,7 @@@ goto retry; } - error = vfs_setxattr(new, name, value, size, 0); - error = security_inode_copy_up_xattr(name); - if (error < 0 && error != -EOPNOTSUPP) - break; - if (error == 1) { - error = 0; - continue; /* Discard */ - } + error = vfs_setxattr(&init_user_ns, new, name, value, size, 0); if (error) { if (error != -EOPNOTSUPP || ovl_must_copy_xattr(name)) break; diff --cc fs/overlayfs/inode.c index cf41bcb664bc7,e78d45dfeaee7..003cf83bf78a4 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@@ -352,9 -354,7 +354,9 @@@ int ovl_xattr_set(struct dentry *dentry goto out; if (!value && !upperdentry) { + old_cred = ovl_override_creds(dentry->d_sb); - err = vfs_getxattr(realdentry, name, NULL, 0); + err = vfs_getxattr(&init_user_ns, realdentry, name, NULL, 0); + revert_creds(old_cred); if (err < 0) goto out_drop_write; } diff --cc fs/xfs/xfs_inode.c index 636ac13b1df2a,95b7f2ba4e065..46a861d55e487 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@@ -809,13 -810,13 +810,13 @@@ xfs_init_new_inode inode->i_rdev = rdev; ip->i_d.di_projid = prid; - if (pip && XFS_INHERIT_GID(pip)) { - inode->i_gid = VFS_I(pip)->i_gid; - if ((VFS_I(pip)->i_mode & S_ISGID) && S_ISDIR(mode)) - inode->i_mode |= S_ISGID; + if (dir && !(dir->i_mode & S_ISGID) && + (mp->m_flags & XFS_MOUNT_GRPID)) { - inode->i_uid = current_fsuid(); ++ inode->i_uid = fsuid_into_mnt(mnt_userns); + inode->i_gid = dir->i_gid; + inode->i_mode = mode; } else { - inode_init_owner(inode, dir, mode); - inode->i_gid = fsgid_into_mnt(mnt_userns); ++ inode_init_owner(mnt_userns, inode, dir, mode); } /* @@@ -1159,12 -1167,16 +1166,12 @@@ xfs_create_tmpfile resblks = XFS_IALLOC_SPACE_RES(mp); tres = &M_RES(mp)->tr_create_tmpfile; - error = xfs_trans_alloc(mp, tres, resblks, 0, 0, &tp); - if (error) - goto out_release_inode; - - error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, - pdqp, resblks, 1, 0); + error = xfs_trans_alloc_icreate(mp, tres, udqp, gdqp, pdqp, resblks, + &tp); if (error) - goto out_trans_cancel; + goto out_release_dquots; - error = xfs_dir_ialloc(&tp, dp, mode, 0, 0, prid, &ip); + error = xfs_dir_ialloc(mnt_userns, &tp, dp, mode, 0, 0, prid, &ip); if (error) goto out_trans_cancel; diff --cc fs/xfs/xfs_ioctl.c index 248083ea0276c,3d4c7ca080fb0..99dfe89a8d08b --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@@ -1275,9 -1280,9 +1280,10 @@@ xfs_ioctl_setattr_prepare_dax */ static struct xfs_trans * xfs_ioctl_setattr_get_trans( - struct xfs_inode *ip, - struct file *file) ++ struct file *file, + struct xfs_dquot *pdqp) { + struct xfs_inode *ip = XFS_I(file_inode(file)); struct xfs_mount *mp = ip->i_mount; struct xfs_trans *tp; int error = -EROFS; @@@ -1461,9 -1470,9 +1469,9 @@@ xfs_ioctl_setattr xfs_ioctl_setattr_prepare_dax(ip, fa); - tp = xfs_ioctl_setattr_get_trans(ip, pdqp); - tp = xfs_ioctl_setattr_get_trans(file); ++ tp = xfs_ioctl_setattr_get_trans(file, pdqp); if (IS_ERR(tp)) { - code = PTR_ERR(tp); + error = PTR_ERR(tp); goto error_free_dquots; } @@@ -1599,7 -1615,7 +1606,7 @@@ xfs_ioc_setxflags xfs_ioctl_setattr_prepare_dax(ip, &fa); - tp = xfs_ioctl_setattr_get_trans(ip, NULL); - tp = xfs_ioctl_setattr_get_trans(filp); ++ tp = xfs_ioctl_setattr_get_trans(filp, NULL); if (IS_ERR(tp)) { error = PTR_ERR(tp); goto out_drop_write; diff --cc security/commoncap.c index 78598be45f101,234b074c2c582..28f4d25480dfa --- a/security/commoncap.c +++ b/security/commoncap.c @@@ -397,17 -405,25 +406,20 @@@ int cap_inode_getsecurity(struct user_n fs_ns = inode->i_sb->s_user_ns; cap = (struct vfs_cap_data *) tmpbuf; if (is_v2header((size_t) ret, cap)) { - /* If this is sizeof(vfs_cap_data) then we're ok with the - * on-disk value, so return that. */ - if (alloc) - *buffer = tmpbuf; - else - kfree(tmpbuf); - return ret; - } else if (!is_v3header((size_t) ret, cap)) { - kfree(tmpbuf); - return -EINVAL; + root = 0; + } else if (is_v3header((size_t) ret, cap)) { + nscap = (struct vfs_ns_cap_data *) tmpbuf; + root = le32_to_cpu(nscap->rootid); + } else { + size = -EINVAL; + goto out_free; } - nscap = (struct vfs_ns_cap_data *) tmpbuf; - root = le32_to_cpu(nscap->rootid); kroot = make_kuid(fs_ns, root); + /* If this is an idmapped mount shift the kuid. */ + kroot = kuid_into_mnt(mnt_userns, kroot); + /* If the root kuid maps to a valid uid in current ns, then return * this as a nscap. */ mappedroot = from_kuid(current_user_ns(), kroot); diff --cc security/integrity/ima/ima.h index aa312472c7c53,b87c9006d5774..8e8b5251550ef --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@@ -254,10 -253,11 +254,11 @@@ static inline void ima_process_queued_k #endif /* CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS */ /* LIM API function definitions */ - int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid, - int mask, enum ima_hooks func, int *pcr, + int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode, + const struct cred *cred, u32 secid, int mask, + enum ima_hooks func, int *pcr, struct ima_template_desc **template_desc, - const char *keyring); + const char *func_data); int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func); int ima_collect_measurement(struct integrity_iint_cache *iint, struct file *file, void *buf, loff_t size, @@@ -267,10 -267,10 +268,11 @@@ void ima_store_measurement(struct integ struct evm_ima_xattr_data *xattr_value, int xattr_len, const struct modsig *modsig, int pcr, struct ima_template_desc *template_desc); - void process_buffer_measurement(struct inode *inode, const void *buf, int size, + void process_buffer_measurement(struct user_namespace *mnt_userns, + struct inode *inode, const void *buf, int size, const char *eventname, enum ima_hooks func, - int pcr, const char *keyring); + int pcr, const char *func_data, + bool buf_hash); void ima_audit_measurement(struct integrity_iint_cache *iint, const unsigned char *filename); int ima_alloc_init_template(struct ima_event_data *event_data, @@@ -283,10 -283,11 +285,11 @@@ void ima_free_template_entry(struct ima const char *ima_d_path(const struct path *path, char **pathbuf, char *filename); /* IMA policy related functions */ - int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid, - enum ima_hooks func, int mask, int flags, int *pcr, + int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode, + const struct cred *cred, u32 secid, enum ima_hooks func, + int mask, int flags, int *pcr, struct ima_template_desc **template_desc, - const char *keyring); + const char *func_data); void ima_init_policy(void); void ima_update_policy(void); void ima_update_policy_flag(void); diff --cc security/integrity/ima/ima_api.c index 1dd70dc68ffde,ed410efb35977..d8e321cc6936b --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@@ -183,17 -184,18 +184,18 @@@ err_out * Returns IMA_MEASURE, IMA_APPRAISE mask. * */ - int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid, - int mask, enum ima_hooks func, int *pcr, + int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode, + const struct cred *cred, u32 secid, int mask, + enum ima_hooks func, int *pcr, struct ima_template_desc **template_desc, - const char *keyring) + const char *func_data) { int flags = IMA_MEASURE | IMA_AUDIT | IMA_APPRAISE | IMA_HASH; flags &= ima_policy_flag; - return ima_match_policy(inode, cred, secid, func, mask, flags, pcr, - template_desc, func_data); + return ima_match_policy(mnt_userns, inode, cred, secid, func, mask, - flags, pcr, template_desc, keyring); ++ flags, pcr, template_desc, func_data); } /* diff --cc security/integrity/ima/ima_appraise.c index 46ffa38bab127,2e64b9f281ccc..565e33ff19d0d --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@@ -350,9 -351,9 +351,9 @@@ int ima_check_blacklist(struct integrit rc = is_binary_blacklisted(digest, digestsize); if ((rc == -EPERM) && (iint->flags & IMA_MEASURE)) - process_buffer_measurement(NULL, digest, digestsize, + process_buffer_measurement(&init_user_ns, NULL, digest, digestsize, "blacklisted-hash", NONE, - pcr, NULL); + pcr, NULL, false); } return rc; diff --cc security/integrity/ima/ima_asymmetric_keys.c index a740957939369,c4ef691007893..1fb0b0e09559b --- a/security/integrity/ima/ima_asymmetric_keys.c +++ b/security/integrity/ima/ima_asymmetric_keys.c @@@ -58,7 -59,7 +59,7 @@@ void ima_post_key_create_or_update(stru * if the IMA policy is configured to measure a key linked * to the given keyring. */ - process_buffer_measurement(NULL, payload, payload_len, + process_buffer_measurement(&init_user_ns, NULL, payload, payload_len, keyring->description, KEY_CHECK, 0, - keyring->description); + keyring->description, false); } diff --cc security/integrity/ima/ima_main.c index 6a429846f90a2,cb1c56eccd6d3..9ef748ea829fe --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@@ -809,22 -816,22 +816,24 @@@ int ima_post_load_data(char *buf, loff_ } /* - * process_buffer_measurement - Measure the buffer to ima log. + * process_buffer_measurement - Measure the buffer or the buffer data hash + * @mnt_userns: user namespace of the mount the inode was found from * @inode: inode associated with the object being measured (NULL for KEY_CHECK) * @buf: pointer to the buffer that needs to be added to the log. * @size: size of buffer(in bytes). * @eventname: event name to be used for the buffer entry. * @func: IMA hook * @pcr: pcr to extend the measurement - * @keyring: keyring name to determine the action to be performed + * @func_data: func specific data, may be NULL + * @buf_hash: measure buffer data hash * - * Based on policy, the buffer is measured into the ima log. + * Based on policy, either the buffer data or buffer data hash is measured */ - void process_buffer_measurement(struct inode *inode, const void *buf, int size, + void process_buffer_measurement(struct user_namespace *mnt_userns, + struct inode *inode, const void *buf, int size, const char *eventname, enum ima_hooks func, - int pcr, const char *keyring) + int pcr, const char *func_data, + bool buf_hash) { int ret = 0; const char *audit_cause = "ENOMEM"; @@@ -864,8 -869,9 +873,9 @@@ */ if (func) { security_task_getsecid(current, &secid); - action = ima_get_action(inode, current_cred(), secid, 0, func, - &pcr, &template, func_data); + action = ima_get_action(mnt_userns, inode, current_cred(), + secid, 0, func, &pcr, &template, - keyring); ++ func_data); if (!(action & IMA_MEASURE)) return; } @@@ -937,38 -929,12 +947,38 @@@ void ima_kexec_cmdline(int kernel_fd, c if (!f.file) return; - process_buffer_measurement(file_inode(f.file), buf, size, - "kexec-cmdline", KEXEC_CMDLINE, 0, NULL, - false); + process_buffer_measurement(file_mnt_user_ns(f.file), file_inode(f.file), + buf, size, "kexec-cmdline", KEXEC_CMDLINE, 0, - NULL); ++ NULL, false); fdput(f); } +/** + * ima_measure_critical_data - measure kernel integrity critical data + * @event_label: unique event label for grouping and limiting critical data + * @event_name: event name for the record in the IMA measurement list + * @buf: pointer to buffer data + * @buf_len: length of buffer data (in bytes) + * @hash: measure buffer data hash + * + * Measure data critical to the integrity of the kernel into the IMA log + * and extend the pcr. Examples of critical data could be various data + * structures, policies, and states stored in kernel memory that can + * impact the integrity of the system. + */ +void ima_measure_critical_data(const char *event_label, + const char *event_name, + const void *buf, size_t buf_len, + bool hash) +{ + if (!event_name || !event_label || !buf || !buf_len) + return; + - process_buffer_measurement(NULL, buf, buf_len, event_name, ++ process_buffer_measurement(&init_user_ns, NULL, buf, buf_len, event_name, + CRITICAL_DATA, 0, event_label, + hash); +} + static int __init init_ima(void) { int error; diff --cc security/integrity/ima/ima_policy.c index 9b45d064a87d7,e14426c24a195..4f8cb155e4fda --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@@ -522,10 -498,11 +523,11 @@@ static bool ima_match_rule_data(struct * * Returns true on rule match, false on failure. */ - static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode, - const struct cred *cred, u32 secid, - enum ima_hooks func, int mask, + static bool ima_match_rules(struct ima_rule_entry *rule, + struct user_namespace *mnt_userns, + struct inode *inode, const struct cred *cred, + u32 secid, enum ima_hooks func, int mask, - const char *keyring) + const char *func_data) { int i; @@@ -650,10 -623,11 +653,11 @@@ static int get_subaction(struct ima_rul * list when walking it. Reads are many orders of magnitude more numerous * than writes so ima_match_policy() is classical RCU candidate. */ - int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid, - enum ima_hooks func, int mask, int flags, int *pcr, + int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode, + const struct cred *cred, u32 secid, enum ima_hooks func, + int mask, int flags, int *pcr, struct ima_template_desc **template_desc, - const char *keyring) + const char *func_data) { struct ima_rule_entry *entry; int action = 0, actmask = flags | (flags << 1); @@@ -667,8 -641,8 +671,8 @@@ if (!(entry->action & actmask)) continue; - if (!ima_match_rules(entry, inode, cred, secid, func, mask, - func_data)) + if (!ima_match_rules(entry, mnt_userns, inode, cred, secid, - func, mask, keyring)) ++ func, mask, func_data)) continue; action |= entry->flags & IMA_ACTION_FLAGS; diff --cc tools/testing/selftests/Makefile index 41f0a0adbb804,157179afd5b7a..6c575cf34a71f --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@@ -33,8 -33,8 +33,9 @@@ TARGETS += memf TARGETS += memory-hotplug TARGETS += mincore TARGETS += mount + TARGETS += mount_setattr TARGETS += mqueue +TARGETS += nci TARGETS += net TARGETS += net/forwarding TARGETS += net/mptcp