Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753254AbcDZTna (ORCPT ); Tue, 26 Apr 2016 15:43:30 -0400 Received: from mail-io0-f176.google.com ([209.85.223.176]:35228 "EHLO mail-io0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752775AbcDZThH (ORCPT ); Tue, 26 Apr 2016 15:37:07 -0400 From: Seth Forshee To: "Eric W. Biederman" , Alexander Viro Cc: Serge Hallyn , Richard Weinberger , Austin S Hemmelgarn , Miklos Szeredi , Pavel Tikhomirov , linux-kernel@vger.kernel.org, linux-bcache@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, fuse-devel@lists.sourceforge.net, linux-security-module@vger.kernel.org, selinux@tycho.nsa.gov, cgroups@vger.kernel.org, Seth Forshee Subject: [PATCH v4 13/21] fs: Update posix_acl support to handle user namespace mounts Date: Tue, 26 Apr 2016 14:36:26 -0500 Message-Id: <1461699396-33000-14-git-send-email-seth.forshee@canonical.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1461699396-33000-1-git-send-email-seth.forshee@canonical.com> References: <1461699396-33000-1-git-send-email-seth.forshee@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6494 Lines: 207 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 Acked-by: Serge Hallyn --- 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 711dd5170376..dac2842dd4cb 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); } /* @@ -780,7 +798,7 @@ 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; @@ -806,7 +824,8 @@ 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 4861322e28e8..c541121945cd 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -330,8 +330,12 @@ 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); @@ -427,9 +431,14 @@ 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 e5e8ec40278d..5dec6b10951a 100644 --- a/include/linux/posix_acl_xattr.h +++ b/include/linux/posix_acl_xattr.h @@ -49,14 +49,23 @@ 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 -- 2.7.4