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f2fs: support xattr security labels

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This patch adds the support of security labels for f2fs, which will be used
by Linus Security Models (LSMs).

Quote from http://en.wikipedia.org/wiki/Linux_Security_Modules:
"Linux Security Modules (LSM) is a framework that allows the Linux kernel to
support a variety of computer security models while avoiding favoritism toward
any single security implementation. The framework is licensed under the terms of
the GNU General Public License and is standard part of the Linux kernel since
Linux 2.6. AppArmor, SELinux, Smack and TOMOYO Linux are the currently accepted
modules in the official kernel.".

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-06-03 19:46:19 +09:00
parent 5deb82671a
commit 8ae8f1627f
7 changed files with 100 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
fs/f2fs/Kconfig
View File

@ -51,3 +51,15 @@ config F2FS_FS_POSIX_ACL
Linux website <http://acl.bestbits.at/>.
If you don't know what Access Control Lists are, say N
config F2FS_FS_SECURITY
bool "F2FS Security Labels"
depends on F2FS_FS_XATTR
help
Security labels provide an access control facility to support Linux
Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
Linux. This option enables an extended attribute handler for file
security labels in the f2fs filesystem, so that it requires enabling
the extended attribute support in advance.
If you are not using a security module, say N.

2
fs/f2fs/acl.c
View File

@ -250,7 +250,7 @@ static int f2fs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
}
}
error = f2fs_setxattr(inode, name_index, "", value, size);
error = f2fs_setxattr(inode, name_index, "", value, size, NULL);
kfree(value);
if (!error)

5
fs/f2fs/dir.c
View File

@ -13,6 +13,7 @@
#include "f2fs.h"
#include "node.h"
#include "acl.h"
#include "xattr.h"
static unsigned long dir_blocks(struct inode *inode)
{
@ -334,6 +335,10 @@ static struct page *init_inode_metadata(struct inode *inode,
if (err)
goto error;
err = f2fs_init_security(inode, dir, name, page);
if (err)
goto error;
wait_on_page_writeback(page);
} else {
page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);

2
fs/f2fs/f2fs.h
View File

@ -968,7 +968,7 @@ int get_dnode_of_data(struct dnode_of_data *, pgoff_t, int);
int truncate_inode_blocks(struct inode *, pgoff_t);
int remove_inode_page(struct inode *);
struct page *new_inode_page(struct inode *, const struct qstr *);
struct page *new_node_page(struct dnode_of_data *, unsigned int);
struct page *new_node_page(struct dnode_of_data *, unsigned int, struct page *);
void ra_node_page(struct f2fs_sb_info *, nid_t);
struct page *get_node_page(struct f2fs_sb_info *, pgoff_t);
struct page *get_node_page_ra(struct page *, int);

12
fs/f2fs/node.c
View File

@ -433,7 +433,7 @@ int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
}
dn->nid = nids[i];
npage[i] = new_node_page(dn, noffset[i]);
npage[i] = new_node_page(dn, noffset[i], NULL);
if (IS_ERR(npage[i])) {
alloc_nid_failed(sbi, nids[i]);
err = PTR_ERR(npage[i]);
@ -814,10 +814,11 @@ struct page *new_inode_page(struct inode *inode, const struct qstr *name)
set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
/* caller should f2fs_put_page(page, 1); */
return new_node_page(&dn, 0);
return new_node_page(&dn, 0, NULL);
}
struct page *new_node_page(struct dnode_of_data *dn, unsigned int ofs)
struct page *new_node_page(struct dnode_of_data *dn,
unsigned int ofs, struct page *ipage)
{
struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
struct address_space *mapping = sbi->node_inode->i_mapping;
@ -850,7 +851,10 @@ struct page *new_node_page(struct dnode_of_data *dn, unsigned int ofs)
set_cold_node(dn->inode, page);
dn->node_page = page;
sync_inode_page(dn);
if (ipage)
update_inode(dn->inode, ipage);
else
sync_inode_page(dn);
set_page_dirty(page);
if (ofs == 0)
inc_valid_inode_count(sbi);

64
fs/f2fs/xattr.c
View File

@ -20,6 +20,7 @@
*/
#include <linux/rwsem.h>
#include <linux/f2fs_fs.h>
#include <linux/security.h>
#include "f2fs.h"
#include "xattr.h"
@ -43,6 +44,10 @@ static size_t f2fs_xattr_generic_list(struct dentry *dentry, char *list,
prefix = XATTR_TRUSTED_PREFIX;
prefix_len = XATTR_TRUSTED_PREFIX_LEN;
break;
case F2FS_XATTR_INDEX_SECURITY:
prefix = XATTR_SECURITY_PREFIX;
prefix_len = XATTR_SECURITY_PREFIX_LEN;
break;
default:
return -EINVAL;
}
@ -50,7 +55,7 @@ static size_t f2fs_xattr_generic_list(struct dentry *dentry, char *list,
total_len = prefix_len + name_len + 1;
if (list && total_len <= list_size) {
memcpy(list, prefix, prefix_len);
memcpy(list+prefix_len, name, name_len);
memcpy(list + prefix_len, name, name_len);
list[prefix_len + name_len] = '\0';
}
return total_len;
@ -70,13 +75,14 @@ static int f2fs_xattr_generic_get(struct dentry *dentry, const char *name,
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
break;
case F2FS_XATTR_INDEX_SECURITY:
break;
default:
return -EINVAL;
}
if (strcmp(name, "") == 0)
return -EINVAL;
return f2fs_getxattr(dentry->d_inode, type, name,
buffer, size);
return f2fs_getxattr(dentry->d_inode, type, name, buffer, size);
}
static int f2fs_xattr_generic_set(struct dentry *dentry, const char *name,
@ -93,13 +99,15 @@ static int f2fs_xattr_generic_set(struct dentry *dentry, const char *name,
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
break;
case F2FS_XATTR_INDEX_SECURITY:
break;
default:
return -EINVAL;
}
if (strcmp(name, "") == 0)
return -EINVAL;
return f2fs_setxattr(dentry->d_inode, type, name, value, size);
return f2fs_setxattr(dentry->d_inode, type, name, value, size, NULL);
}
static size_t f2fs_xattr_advise_list(struct dentry *dentry, char *list,
@ -145,6 +153,31 @@ static int f2fs_xattr_advise_set(struct dentry *dentry, const char *name,
return 0;
}
#ifdef CONFIG_F2FS_FS_SECURITY
static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
void *page)
{
const struct xattr *xattr;
int err = 0;
for (xattr = xattr_array; xattr->name != NULL; xattr++) {
err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
xattr->name, xattr->value,
xattr->value_len, (struct page *)page);
if (err < 0)
break;
}
return err;
}
int f2fs_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr, struct page *ipage)
{
return security_inode_init_security(inode, dir, qstr,
&f2fs_initxattrs, ipage);
}
#endif
const struct xattr_handler f2fs_xattr_user_handler = {
.prefix = XATTR_USER_PREFIX,
.flags = F2FS_XATTR_INDEX_USER,
@ -169,6 +202,14 @@ const struct xattr_handler f2fs_xattr_advise_handler = {
.set = f2fs_xattr_advise_set,
};
const struct xattr_handler f2fs_xattr_security_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.flags = F2FS_XATTR_INDEX_SECURITY,
.list = f2fs_xattr_generic_list,
.get = f2fs_xattr_generic_get,
.set = f2fs_xattr_generic_set,
};
static const struct xattr_handler *f2fs_xattr_handler_map[] = {
[F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
#ifdef CONFIG_F2FS_FS_POSIX_ACL
@ -176,6 +217,9 @@ static const struct xattr_handler *f2fs_xattr_handler_map[] = {
[F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &f2fs_xattr_acl_default_handler,
#endif
[F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
#ifdef CONFIG_F2FS_FS_SECURITY
[F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
#endif
[F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
};
@ -186,6 +230,9 @@ const struct xattr_handler *f2fs_xattr_handlers[] = {
&f2fs_xattr_acl_default_handler,
#endif
&f2fs_xattr_trusted_handler,
#ifdef CONFIG_F2FS_FS_SECURITY
&f2fs_xattr_security_handler,
#endif
&f2fs_xattr_advise_handler,
NULL,
};
@ -300,7 +347,7 @@ cleanup:
}
int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
const void *value, size_t value_len)
const void *value, size_t value_len, struct page *ipage)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct f2fs_inode_info *fi = F2FS_I(inode);
@ -339,7 +386,7 @@ int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
set_new_dnode(&dn, inode, NULL, NULL, fi->i_xattr_nid);
mark_inode_dirty(inode);
page = new_node_page(&dn, XATTR_NODE_OFFSET);
page = new_node_page(&dn, XATTR_NODE_OFFSET, ipage);
if (IS_ERR(page)) {
alloc_nid_failed(sbi, fi->i_xattr_nid);
fi->i_xattr_nid = 0;
@ -439,7 +486,10 @@ int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
inode->i_ctime = CURRENT_TIME;
clear_inode_flag(fi, FI_ACL_MODE);
}
update_inode_page(inode);
if (ipage)
update_inode(inode, ipage);
else
update_inode_page(inode);
mutex_unlock_op(sbi, ilock);
return 0;

24
fs/f2fs/xattr.h
View File

@ -112,21 +112,19 @@ extern const struct xattr_handler f2fs_xattr_trusted_handler;
extern const struct xattr_handler f2fs_xattr_acl_access_handler;
extern const struct xattr_handler f2fs_xattr_acl_default_handler;
extern const struct xattr_handler f2fs_xattr_advise_handler;
extern const struct xattr_handler f2fs_xattr_security_handler;
extern const struct xattr_handler *f2fs_xattr_handlers[];
extern int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
const void *value, size_t value_len);
extern int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
void *buffer, size_t buffer_size);
extern ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
size_t buffer_size);
extern int f2fs_setxattr(struct inode *, int, const char *,
const void *, size_t, struct page *);
extern int f2fs_getxattr(struct inode *, int, const char *, void *, size_t);
extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t);
#else
#define f2fs_xattr_handlers NULL
static inline int f2fs_setxattr(struct inode *inode, int name_index,
const char *name, const void *value, size_t value_len)
const char *name, const void *value, size_t value_len)
{
return -EOPNOTSUPP;
}
@ -142,4 +140,14 @@ static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
}
#endif
#ifdef CONFIG_F2FS_FS_SECURITY
extern int f2fs_init_security(struct inode *, struct inode *,
const struct qstr *, struct page *);
#else
static inline int f2fs_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr, struct page *ipage)
{
return 0;
}
#endif
#endif /* __F2FS_XATTR_H__ */