Andreas Gruenbacher <agruenba@xxxxxxxxxx> writes: > From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx> > > Support the richacl permission model in ext4. The richacls are stored > in "system.richacl" xattrs. Richacls need to be enabled by tune2fs or > at file system create time. > Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx> > --- > fs/ext4/Kconfig | 15 ++++ > fs/ext4/Makefile | 1 + > fs/ext4/acl.c | 6 +- > fs/ext4/acl.h | 12 +-- > fs/ext4/file.c | 6 +- > fs/ext4/ialloc.c | 7 +- > fs/ext4/inode.c | 10 ++- > fs/ext4/namei.c | 11 ++- > fs/ext4/richacl.c | 213 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ > fs/ext4/richacl.h | 47 ++++++++++++ > fs/ext4/xattr.c | 6 ++ > fs/ext4/xattr.h | 1 + > 12 files changed, 316 insertions(+), 19 deletions(-) > create mode 100644 fs/ext4/richacl.c > create mode 100644 fs/ext4/richacl.h > > diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig > index bf8bc8a..77a386d 100644 > --- a/fs/ext4/Kconfig > +++ b/fs/ext4/Kconfig > @@ -96,3 +96,18 @@ config EXT4_DEBUG > If you select Y here, then you will be able to turn on debugging > with a command such as: > echo 1 > /sys/module/ext4/parameters/mballoc_debug > + > +config EXT4_FS_RICHACL > + bool "Ext4 Rich Access Control Lists (EXPERIMENTAL)" > + depends on EXT4_FS > + select FS_RICHACL > + help > + Rich ACLs are an implementation of NFSv4 ACLs, extended by file masks > + to fit into the standard POSIX file permission model. They are > + designed to work seamlessly locally as well as across the NFSv4 and > + CIFS/SMB2 network file system protocols. > + > + To learn more about Rich ACL, visit > + http://acl.bestbits.at/richacl/ > + > + If you don't know what Rich ACLs are, say N > diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile > index 75285ea..ea0d539 100644 > --- a/fs/ext4/Makefile > +++ b/fs/ext4/Makefile > @@ -14,3 +14,4 @@ ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o > ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o > ext4-$(CONFIG_EXT4_FS_ENCRYPTION) += crypto_policy.o crypto.o \ > crypto_key.o crypto_fname.o > +ext4-$(CONFIG_EXT4_FS_RICHACL) += richacl.o > diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c > index 69b1e73..d965fa6 100644 > --- a/fs/ext4/acl.c > +++ b/fs/ext4/acl.c > @@ -140,7 +140,7 @@ fail: > * inode->i_mutex: don't care > */ > struct posix_acl * > -ext4_get_acl(struct inode *inode, int type) > +ext4_get_posix_acl(struct inode *inode, int type) > { > int name_index; > char *value = NULL; > @@ -234,7 +234,7 @@ __ext4_set_acl(handle_t *handle, struct inode *inode, int type, > } > > int > -ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type) > +ext4_set_posix_acl(struct inode *inode, struct posix_acl *acl, int type) > { > handle_t *handle; > int error, retries = 0; > @@ -259,7 +259,7 @@ retry: > * inode->i_mutex: up (access to inode is still exclusive) > */ > int > -ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) > +ext4_init_posix_acl(handle_t *handle, struct inode *inode, struct inode *dir) > { > struct posix_acl *default_acl, *acl; > int error; > diff --git a/fs/ext4/acl.h b/fs/ext4/acl.h > index da2c795..450b4d1 100644 > --- a/fs/ext4/acl.h > +++ b/fs/ext4/acl.h > @@ -54,17 +54,17 @@ static inline int ext4_acl_count(size_t size) > #ifdef CONFIG_EXT4_FS_POSIX_ACL > > /* acl.c */ > -struct posix_acl *ext4_get_acl(struct inode *inode, int type); > -int ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type); > -extern int ext4_init_acl(handle_t *, struct inode *, struct inode *); > +struct posix_acl *ext4_get_posix_acl(struct inode *inode, int type); > +int ext4_set_posix_acl(struct inode *inode, struct posix_acl *acl, int type); > +extern int ext4_init_posix_acl(handle_t *, struct inode *, struct inode *); > > #else /* CONFIG_EXT4_FS_POSIX_ACL */ > #include <linux/sched.h> > -#define ext4_get_acl NULL > -#define ext4_set_acl NULL > +#define ext4_get_posix_acl NULL > +#define ext4_set_posix_acl NULL > > static inline int > -ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) > +ext4_init_posix_acl(handle_t *handle, struct inode *inode, struct inode *dir) > { > return 0; > } > diff --git a/fs/ext4/file.c b/fs/ext4/file.c > index bc313ac..3d3fcc8 100644 > --- a/fs/ext4/file.c > +++ b/fs/ext4/file.c > @@ -29,6 +29,7 @@ > #include "ext4_jbd2.h" > #include "xattr.h" > #include "acl.h" > +#include "richacl.h" > > /* > * Called when an inode is released. Note that this is different > @@ -659,8 +660,9 @@ const struct inode_operations ext4_file_inode_operations = { > .getxattr = generic_getxattr, > .listxattr = ext4_listxattr, > .removexattr = generic_removexattr, > - .get_acl = ext4_get_acl, > - .set_acl = ext4_set_acl, > + .get_acl = ext4_get_posix_acl, > + .set_acl = ext4_set_posix_acl, > + .get_richacl = ext4_get_richacl, > .fiemap = ext4_fiemap, > }; > > diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c > index 173c1ae..aa5d1e1 100644 > --- a/fs/ext4/ialloc.c > +++ b/fs/ext4/ialloc.c > @@ -27,6 +27,7 @@ > #include "ext4_jbd2.h" > #include "xattr.h" > #include "acl.h" > +#include "richacl.h" > > #include <trace/events/ext4.h> > > @@ -1050,7 +1051,11 @@ got: > if (err) > goto fail_drop; > > - err = ext4_init_acl(handle, inode, dir); > + if (EXT4_IS_RICHACL(dir)) > + err = ext4_init_richacl(handle, inode, dir); > + else > + err = ext4_init_posix_acl(handle, inode, dir); > + > if (err) > goto fail_free_drop; > > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c > index cecf9aa..7f6bbe8 100644 > --- a/fs/ext4/inode.c > +++ b/fs/ext4/inode.c > @@ -41,6 +41,7 @@ > #include "xattr.h" > #include "acl.h" > #include "truncate.h" > +#include "richacl.h" > > #include <trace/events/ext4.h> > > @@ -4782,9 +4783,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) > if (orphan && inode->i_nlink) > ext4_orphan_del(NULL, inode); > > - if (!rc && (ia_valid & ATTR_MODE)) > - rc = posix_acl_chmod(inode, inode->i_mode); > - > + if (!rc && (ia_valid & ATTR_MODE)) { > + if (EXT4_IS_RICHACL(inode)) > + rc = ext4_richacl_chmod(inode); > + else > + rc = posix_acl_chmod(inode, inode->i_mode); > + } > err_out: > ext4_std_error(inode->i_sb, error); > if (!error) > diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c > index 011dcfb..9be6a8a 100644 > --- a/fs/ext4/namei.c > +++ b/fs/ext4/namei.c > @@ -38,6 +38,7 @@ > > #include "xattr.h" > #include "acl.h" > +#include "richacl.h" > > #include <trace/events/ext4.h> > /* > @@ -3821,8 +3822,9 @@ const struct inode_operations ext4_dir_inode_operations = { > .getxattr = generic_getxattr, > .listxattr = ext4_listxattr, > .removexattr = generic_removexattr, > - .get_acl = ext4_get_acl, > - .set_acl = ext4_set_acl, > + .get_acl = ext4_get_posix_acl, > + .set_acl = ext4_set_posix_acl, > + .get_richacl = ext4_get_richacl, > .fiemap = ext4_fiemap, > }; > > @@ -3832,6 +3834,7 @@ const struct inode_operations ext4_special_inode_operations = { > .getxattr = generic_getxattr, > .listxattr = ext4_listxattr, > .removexattr = generic_removexattr, > - .get_acl = ext4_get_acl, > - .set_acl = ext4_set_acl, > + .get_acl = ext4_get_posix_acl, > + .set_acl = ext4_set_posix_acl, > + .get_richacl = ext4_get_richacl, > }; > diff --git a/fs/ext4/richacl.c b/fs/ext4/richacl.c > new file mode 100644 > index 0000000..6758def > --- /dev/null > +++ b/fs/ext4/richacl.c > @@ -0,0 +1,213 @@ > +/* > + * Copyright IBM Corporation, 2010 > + * Copyright (C) 2015 Red Hat, Inc. > + * Author Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of version 2.1 of the GNU Lesser General Public License > + * as published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it would be useful, but > + * WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. > + * > + */ > + > +#include <linux/kernel.h> > +#include <linux/fs.h> > +#include <linux/richacl_xattr.h> > + > +#include "ext4.h" > +#include "ext4_jbd2.h" > +#include "xattr.h" > +#include "acl.h" > +#include "richacl.h" > + > +struct richacl * > +ext4_get_richacl(struct inode *inode) > +{ > + const int name_index = EXT4_XATTR_INDEX_RICHACL; > + void *value = NULL; > + struct richacl *acl; > + int retval; > + > + if (!IS_RICHACL(inode)) > + return ERR_PTR(-EOPNOTSUPP); > + acl = get_cached_richacl(inode); > + if (acl != ACL_NOT_CACHED) > + return acl; > + retval = ext4_xattr_get(inode, name_index, "", NULL, 0); > + if (retval > 0) { > + value = kmalloc(retval, GFP_NOFS); > + if (!value) > + return ERR_PTR(-ENOMEM); > + retval = ext4_xattr_get(inode, name_index, "", value, retval); > + } > + if (retval > 0) { > + acl = richacl_from_xattr(&init_user_ns, value, retval); > + if (acl == ERR_PTR(-EINVAL)) > + acl = ERR_PTR(-EIO); > + } else if (retval == -ENODATA || retval == -ENOSYS) > + acl = NULL; > + else > + acl = ERR_PTR(retval); > + kfree(value); > + > + if (!IS_ERR(acl)) > + set_cached_richacl(inode, acl); > + > + return acl; > +} > + > +static int > +ext4_set_richacl(handle_t *handle, struct inode *inode, struct richacl *acl) > +{ > + const int name_index = EXT4_XATTR_INDEX_RICHACL; > + size_t size = 0; > + void *value = NULL; > + int retval; > + > + if (acl) { > + mode_t mode = inode->i_mode; > + > + if (richacl_equiv_mode(acl, &mode) == 0) { > + inode->i_mode = mode; > + ext4_mark_inode_dirty(handle, inode); > + acl = NULL; > + } > + } > + if (acl) { > + size = richacl_xattr_size(acl); > + value = kmalloc(size, GFP_NOFS); > + if (!value) > + return -ENOMEM; > + richacl_to_xattr(&init_user_ns, acl, value, size); > + } > + if (handle) > + retval = ext4_xattr_set_handle(handle, inode, name_index, "", > + value, size, 0); > + else > + retval = ext4_xattr_set(inode, name_index, "", value, size, 0); > + kfree(value); > + if (!retval) > + set_cached_richacl(inode, acl); > + > + return retval; > +} > + > +int > +ext4_init_richacl(handle_t *handle, struct inode *inode, struct inode *dir) > +{ > + struct richacl *acl = richacl_create(inode, dir); > + int error; > + > + error = PTR_ERR(acl); > + if (IS_ERR(acl)) > + return error; > + if (acl) { > + error = ext4_set_richacl(handle, inode, acl); > + richacl_put(acl); > + } > + return error; > +} > + > +int > +ext4_richacl_chmod(struct inode *inode) > +{ > + struct richacl *acl; > + int retval; > + > + if (S_ISLNK(inode->i_mode)) > + return -EOPNOTSUPP; > + acl = ext4_get_richacl(inode); > + if (IS_ERR_OR_NULL(acl)) > + return PTR_ERR(acl); > + acl = richacl_chmod(acl, inode->i_mode); > + if (IS_ERR(acl)) > + return PTR_ERR(acl); > + retval = ext4_set_richacl(NULL, inode, acl); > + richacl_put(acl); > + > + return retval; > +} > + > +static size_t > +ext4_xattr_list_richacl(struct dentry *dentry, char *list, size_t list_len, > + const char *name, size_t name_len, int type) > +{ > + const size_t size = sizeof(XATTR_NAME_RICHACL); > + > + if (!IS_RICHACL(d_inode(dentry))) > + return 0; > + if (list && size <= list_len) > + memcpy(list, XATTR_NAME_RICHACL, size); > + return size; > +} > + > +static int > +ext4_xattr_get_richacl(struct dentry *dentry, const char *name, void *buffer, > + size_t buffer_size, int type) > +{ > + struct richacl *acl; > + int error; > + > + if (strcmp(name, "") != 0) > + return -EINVAL; > + acl = ext4_get_richacl(d_inode(dentry)); > + if (IS_ERR(acl)) > + return PTR_ERR(acl); > + if (acl == NULL) > + return -ENODATA; > + > + error = richacl_to_xattr(&init_user_ns, acl, buffer, buffer_size); > + richacl_put(acl); > + return error; > +} > + > +static int > +ext4_xattr_set_richacl(struct dentry *dentry, const char *name, > + const void *value, size_t size, int flags, int type) > +{ > + handle_t *handle; > + struct richacl *acl = NULL; > + int retval, retries = 0; > + struct inode *inode = d_inode(dentry); > + > + if (!IS_RICHACL(d_inode(dentry))) > + return -EOPNOTSUPP; > + if (S_ISLNK(inode->i_mode)) > + return -EOPNOTSUPP; > + if (strcmp(name, "") != 0) > + return -EINVAL; > + if (!uid_eq(current_fsuid(), inode->i_uid) && > + inode_permission(inode, MAY_CHMOD) && > + !capable(CAP_FOWNER)) > + return -EPERM; > + if (value) { > + acl = richacl_from_xattr(&init_user_ns, value, size); > + if (IS_ERR(acl)) > + return PTR_ERR(acl); > + > + inode->i_mode &= ~S_IRWXUGO; > + inode->i_mode |= richacl_masks_to_mode(acl); > + } > + > +retry: > + handle = ext4_journal_start(inode, EXT4_HT_XATTR, > + EXT4_DATA_TRANS_BLOCKS(inode->i_sb)); > + if (IS_ERR(handle)) > + return PTR_ERR(handle); > + retval = ext4_set_richacl(handle, inode, acl); > + ext4_journal_stop(handle); > + if (retval == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) > + goto retry; > + richacl_put(acl); > + return retval; > +} > + > +const struct xattr_handler ext4_richacl_xattr_handler = { > + .prefix = XATTR_NAME_RICHACL, > + .list = ext4_xattr_list_richacl, > + .get = ext4_xattr_get_richacl, > + .set = ext4_xattr_set_richacl, > +}; > diff --git a/fs/ext4/richacl.h b/fs/ext4/richacl.h > new file mode 100644 > index 0000000..09a5cad > --- /dev/null > +++ b/fs/ext4/richacl.h > @@ -0,0 +1,47 @@ > +/* > + * Copyright IBM Corporation, 2010 > + * Copyright (C) 2015 Red Hat, Inc. > + * Author Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of version 2.1 of the GNU Lesser General Public License > + * as published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it would be useful, but > + * WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. > + * > + */ > + > +#ifndef __FS_EXT4_RICHACL_H > +#define __FS_EXT4_RICHACL_H > + > +#include <linux/richacl.h> > + > +#ifdef CONFIG_EXT4_FS_RICHACL > + > +#define EXT4_IS_RICHACL(inode) IS_RICHACL(inode) > + > +extern struct richacl *ext4_get_richacl(struct inode *); > +extern int ext4_init_richacl(handle_t *, struct inode *, struct inode *); > +extern int ext4_richacl_chmod(struct inode *); > + > +#else /* CONFIG_FS_EXT4_RICHACL */ > + > +#define EXT4_IS_RICHACL(inode) (0) > +#define ext4_get_richacl NULL > + > +static inline int > +ext4_init_richacl(handle_t *handle, struct inode *inode, struct inode *dir) > +{ > + return 0; > +} > + > +static inline int > +ext4_richacl_chmod(struct inode *inode) > +{ > + return 0; > +} > + > +#endif /* CONFIG_FS_EXT4_RICHACL */ > +#endif /* __FS_EXT4_RICHACL_H */ > diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c > index 16e28c0..c1dee9b 100644 > --- a/fs/ext4/xattr.c > +++ b/fs/ext4/xattr.c > @@ -99,6 +99,9 @@ static const struct xattr_handler *ext4_xattr_handler_map[] = { > #ifdef CONFIG_EXT4_FS_SECURITY > [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, > #endif > +#ifdef CONFIG_EXT4_FS_RICHACL > + [EXT4_XATTR_INDEX_RICHACL] = &ext4_richacl_xattr_handler, > +#endif > }; > > const struct xattr_handler *ext4_xattr_handlers[] = { > @@ -111,6 +114,9 @@ const struct xattr_handler *ext4_xattr_handlers[] = { > #ifdef CONFIG_EXT4_FS_SECURITY > &ext4_xattr_security_handler, > #endif > +#ifdef CONFIG_EXT4_FS_RICHACL > + &ext4_richacl_xattr_handler, > +#endif > NULL > }; > > diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h > index ddc0957..f315493 100644 > --- a/fs/ext4/xattr.h > +++ b/fs/ext4/xattr.h > @@ -98,6 +98,7 @@ struct ext4_xattr_ibody_find { > extern const struct xattr_handler ext4_xattr_user_handler; > extern const struct xattr_handler ext4_xattr_trusted_handler; > extern const struct xattr_handler ext4_xattr_security_handler; > +extern const struct xattr_handler ext4_richacl_xattr_handler; > > #define EXT4_XATTR_NAME_ENCRYPTION_CONTEXT "c" > > -- > 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
