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authorChristian Brauner <christian.brauner@ubuntu.com>2021-01-21 16:19:27 +0300
committerChristian Brauner <christian.brauner@ubuntu.com>2021-01-24 16:27:17 +0300
commite65ce2a50cf6af216bea6fd80d771fcbb4c0aaa1 (patch)
treeb137cac7f442a182e02f1cd9d66acd643f61bcff /fs/jfs
parent2f221d6f7b881d95de1f356a3097d755ab1e47d4 (diff)
downloadlinux-e65ce2a50cf6af216bea6fd80d771fcbb4c0aaa1.tar.xz
acl: handle idmapped mounts
The posix acl permission checking helpers determine whether a caller is privileged over an inode according to the acls associated with the inode. Add helpers that make it possible to handle acls on idmapped mounts. The vfs and the filesystems targeted by this first iteration make use of posix_acl_fix_xattr_from_user() and posix_acl_fix_xattr_to_user() to translate basic posix access and default permissions such as the ACL_USER and ACL_GROUP type according to the initial user namespace (or the superblock's user namespace) to and from the caller's current user namespace. Adapt these two helpers to handle idmapped mounts whereby we either map from or into the mount's user namespace depending on in which direction we're translating. Similarly, cap_convert_nscap() is used by the vfs to translate user namespace and non-user namespace aware filesystem capabilities from the superblock's user namespace to the caller's user namespace. Enable it to handle idmapped mounts by accounting for the mount's user namespace. In addition the fileystems targeted in the first iteration of this patch series make use of the posix_acl_chmod() and, posix_acl_update_mode() helpers. Both helpers perform permission checks on the target inode. Let them handle idmapped mounts. These two helpers are called when posix acls are set by the respective filesystems to handle this case we extend the ->set() method to take an additional user namespace argument to pass the mount's user namespace down. Link: https://lore.kernel.org/r/20210121131959.646623-9-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> 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>
Diffstat (limited to 'fs/jfs')
-rw-r--r--fs/jfs/acl.c2
-rw-r--r--fs/jfs/file.c2
-rw-r--r--fs/jfs/xattr.c2
3 files changed, 4 insertions, 2 deletions
diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c
index 92cc0ac2d1fc..cf79a34bfada 100644
--- a/fs/jfs/acl.c
+++ b/fs/jfs/acl.c
@@ -101,7 +101,7 @@ int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
tid = txBegin(inode->i_sb, 0);
mutex_lock(&JFS_IP(inode)->commit_mutex);
if (type == ACL_TYPE_ACCESS && acl) {
- rc = posix_acl_update_mode(inode, &mode, &acl);
+ rc = posix_acl_update_mode(&init_user_ns, inode, &mode, &acl);
if (rc)
goto end_tx;
if (mode != inode->i_mode)
diff --git a/fs/jfs/file.c b/fs/jfs/file.c
index ff49876e9c9b..61c3b0c1fbf6 100644
--- a/fs/jfs/file.c
+++ b/fs/jfs/file.c
@@ -122,7 +122,7 @@ int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
mark_inode_dirty(inode);
if (iattr->ia_valid & ATTR_MODE)
- rc = posix_acl_chmod(inode, inode->i_mode);
+ rc = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
return rc;
}
diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index db41e7803163..f9273f6901c8 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -932,6 +932,7 @@ static int jfs_xattr_get(const struct xattr_handler *handler,
}
static int jfs_xattr_set(const struct xattr_handler *handler,
+ struct user_namespace *mnt_userns,
struct dentry *unused, struct inode *inode,
const char *name, const void *value,
size_t size, int flags)
@@ -950,6 +951,7 @@ static int jfs_xattr_get_os2(const struct xattr_handler *handler,
}
static int jfs_xattr_set_os2(const struct xattr_handler *handler,
+ struct user_namespace *mnt_userns,
struct dentry *unused, struct inode *inode,
const char *name, const void *value,
size_t size, int flags)