[PATCH 3/4] UBIFS: Add security.* XATTR support for the UBIFS
Ben Shelton
ben.shelton at ni.com
Fri Oct 31 11:50:30 PDT 2014
From: Subodh Nijsure <snijsure at grid-net.com>
Signed-off-by: Subodh Nijsure <snijsure at grid-net.com>
Signed-off-by: Marc Kleine-Budde <mkl at pengutronix.de>
Signed-off-by: Ben Shelton <ben.shelton at ni.com>
Acked-by: Brad Mouring <brad.mouring at ni.com>
Acked-by: Terry Wilcox <terry.wilcox at ni.com>
Acked-by: Gratian Crisan <gratian.crisan at ni.com>
---
fs/ubifs/dir.c | 20 ++++++++++++++
fs/ubifs/super.c | 1 +
fs/ubifs/ubifs.h | 4 +++
fs/ubifs/xattr.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 104 insertions(+)
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index ea41649..31de1c4 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -272,6 +272,10 @@ static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
goto out_budg;
}
+ err = ubifs_init_security(dir, inode, &dentry->d_name);
+ if (err)
+ goto out_cancel;
+
mutex_lock(&dir_ui->ui_mutex);
dir->i_size += sz_change;
dir_ui->ui_size = dir->i_size;
@@ -279,6 +283,7 @@ static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
if (err)
goto out_cancel;
+
mutex_unlock(&dir_ui->ui_mutex);
ubifs_release_budget(c, &req);
@@ -728,6 +733,10 @@ static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
goto out_budg;
}
+ err = ubifs_init_security(dir, inode, &dentry->d_name);
+ if (err)
+ goto out_cancel;
+
mutex_lock(&dir_ui->ui_mutex);
insert_inode_hash(inode);
inc_nlink(inode);
@@ -740,6 +749,7 @@ static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
ubifs_err("cannot create directory, error %d", err);
goto out_cancel;
}
+
mutex_unlock(&dir_ui->ui_mutex);
ubifs_release_budget(c, &req);
@@ -808,6 +818,10 @@ static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
ui->data = dev;
ui->data_len = devlen;
+ err = ubifs_init_security(dir, inode, &dentry->d_name);
+ if (err)
+ goto out_cancel;
+
mutex_lock(&dir_ui->ui_mutex);
dir->i_size += sz_change;
dir_ui->ui_size = dir->i_size;
@@ -815,6 +829,7 @@ static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
if (err)
goto out_cancel;
+
mutex_unlock(&dir_ui->ui_mutex);
ubifs_release_budget(c, &req);
@@ -884,6 +899,10 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
ui->data_len = len;
inode->i_size = ubifs_inode(inode)->ui_size = len;
+ err = ubifs_init_security(dir, inode, &dentry->d_name);
+ if (err)
+ goto out_cancel;
+
mutex_lock(&dir_ui->ui_mutex);
dir->i_size += sz_change;
dir_ui->ui_size = dir->i_size;
@@ -891,6 +910,7 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
if (err)
goto out_cancel;
+
mutex_unlock(&dir_ui->ui_mutex);
ubifs_release_budget(c, &req);
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 106bf20..e642067 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -2039,6 +2039,7 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
if (c->max_inode_sz > MAX_LFS_FILESIZE)
sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
sb->s_op = &ubifs_super_operations;
+ sb->s_xattr = ubifs_xattr_handlers;
mutex_lock(&c->umount_mutex);
err = mount_ubifs(c);
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index c4fe900..bc04b9c 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -36,6 +36,7 @@
#include <linux/mtd/ubi.h>
#include <linux/pagemap.h>
#include <linux/backing-dev.h>
+#include <linux/security.h>
#include "ubifs-media.h"
/* Version of this UBIFS implementation */
@@ -1465,6 +1466,7 @@ extern spinlock_t ubifs_infos_lock;
extern atomic_long_t ubifs_clean_zn_cnt;
extern struct kmem_cache *ubifs_inode_slab;
extern const struct super_operations ubifs_super_operations;
+extern const struct xattr_handler *ubifs_xattr_handlers[];
extern const struct address_space_operations ubifs_file_address_operations;
extern const struct file_operations ubifs_file_operations;
extern const struct inode_operations ubifs_file_inode_operations;
@@ -1754,6 +1756,8 @@ ssize_t ubifs_getxattr(struct dentry *dentry, const char *name, void *buf,
size_t size);
ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size);
int ubifs_removexattr(struct dentry *dentry, const char *name);
+int ubifs_init_security(struct inode *dentry, struct inode *inode,
+ const struct qstr *qstr);
/* super.c */
struct inode *ubifs_iget(struct super_block *sb, unsigned long inum);
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index d0f69c2..f844841 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -575,3 +575,82 @@ out_free:
kfree(xent);
return err;
}
+
+size_t ubifs_security_listxattr(struct dentry *d, char *list, size_t list_size,
+ const char *name, size_t name_len, int flags)
+{
+ const int prefix_len = XATTR_SECURITY_PREFIX_LEN;
+ const size_t total_len = prefix_len + name_len + 1;
+
+ if (list && total_len <= list_size) {
+ memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
+ memcpy(list + prefix_len, name, name_len);
+ list[prefix_len + name_len] = '\0';
+ }
+
+ return total_len;
+}
+
+int ubifs_security_getxattr(struct dentry *d, const char *name,
+ void *buffer, size_t size, int flags)
+{
+ return ubifs_getxattr(d, name, buffer, size);
+}
+
+int ubifs_security_setxattr(struct dentry *d, const char *name,
+ const void *value, size_t size,
+ int flags, int handler_flags)
+{
+ return ubifs_setxattr(d, name, value, size, flags);
+}
+
+struct xattr_handler ubifs_xattr_security_handler = {
+ .prefix = XATTR_SECURITY_PREFIX,
+ .list = ubifs_security_listxattr,
+ .get = ubifs_security_getxattr,
+ .set = ubifs_security_setxattr,
+};
+
+const struct xattr_handler *ubifs_xattr_handlers[] = {
+ &ubifs_xattr_security_handler,
+ NULL
+};
+
+static int ubifs_initxattrs(struct inode *inode,
+ const struct xattr *xattr_array, void *fs_info)
+{
+ const struct xattr *xattr;
+ char *name;
+ int err = 0;
+
+ for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+ name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
+ strlen(xattr->name) + 1, GFP_NOFS);
+ if (!name) {
+ err = -ENOMEM;
+ break;
+ }
+ strcpy(name, XATTR_SECURITY_PREFIX);
+ strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
+ err = __ubifs_setxattr(inode, name, xattr->value,
+ xattr->value_len, 0);
+ kfree(name);
+ if (err < 0)
+ break;
+ }
+
+ return err;
+}
+
+int ubifs_init_security(struct inode *dentry, struct inode *inode,
+ const struct qstr *qstr)
+{
+ int err;
+
+ mutex_lock(&inode->i_mutex);
+ err = security_inode_init_security(inode, dentry, qstr,
+ &ubifs_initxattrs, 0);
+ mutex_unlock(&inode->i_mutex);
+
+ return err;
+}
--
2.1.1
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