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sanitize xattr handler prototypes

Browse source 
Add a flags argument to struct xattr_handler and pass it to all xattr
handler methods.  This allows using the same methods for multiple
handlers, e.g. for the ACL methods which perform exactly the same action
for the access and default ACLs, just using a different underlying
attribute.  With a little more groundwork it'll also allow sharing the
methods for the regular user/trusted/secure handlers in extN, ocfs2 and
jffs2 like it's already done for xfs in this patch.

Also change the inode argument to the handlers to a dentry to allow
using the handlers mechnism for filesystems that require it later,
e.g. cifs.

[with GFS2 bits updated by Steven Whitehouse <[email protected]>]

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: James Morris <[email protected]>
Acked-by: Joel Becker <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Christoph Hellwig 2009-11-13 09:52:56 +00:00 • committed by Al Viro
commit 431547b3c4
39 changed files with 533 additions and 815 deletions
Download patch file Download diff file Expand all files Collapse all files

79
fs/ext2/acl.c
View file

@ -339,12 +339,12 @@ ext2_acl_chmod(struct inode *inode)
* Extended attribut handlers
*/
static size_t
ext2_xattr_list_acl_access(struct inode *inode, char *list, size_t list_size,
const char *name, size_t name_len)
ext2_xattr_list_acl_access(struct dentry *dentry, char *list, size_t list_size,
const char *name, size_t name_len, int type)
{
const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
if (!test_opt(inode->i_sb, POSIX_ACL))
if (!test_opt(dentry->d_sb, POSIX_ACL))
return 0;
if (list && size <= list_size)
memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
@ -352,12 +352,12 @@ ext2_xattr_list_acl_access(struct inode *inode, char *list, size_t list_size,
}
static size_t
ext2_xattr_list_acl_default(struct inode *inode, char *list, size_t list_size,
const char *name, size_t name_len)
ext2_xattr_list_acl_default(struct dentry *dentry, char *list, size_t list_size,
const char *name, size_t name_len, int type)
{
const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
if (!test_opt(inode->i_sb, POSIX_ACL))
if (!test_opt(dentry->d_sb, POSIX_ACL))
return 0;
if (list && size <= list_size)
memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
@ -365,15 +365,18 @@ ext2_xattr_list_acl_default(struct inode *inode, char *list, size_t list_size,
}
static int
ext2_xattr_get_acl(struct inode *inode, int type, void *buffer, size_t size)
ext2_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,
size_t size, int type)
{
struct posix_acl *acl;
int error;
if (!test_opt(inode->i_sb, POSIX_ACL))
if (strcmp(name, "") != 0)
return -EINVAL;
if (!test_opt(dentry->d_sb, POSIX_ACL))
return -EOPNOTSUPP;
acl = ext2_get_acl(inode, type);
acl = ext2_get_acl(dentry->d_inode, type);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl == NULL)
@ -385,33 +388,17 @@ ext2_xattr_get_acl(struct inode *inode, int type, void *buffer, size_t size)
}
static int
ext2_xattr_get_acl_access(struct inode *inode, const char *name,
void *buffer, size_t size)
{
if (strcmp(name, "") != 0)
return -EINVAL;
return ext2_xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
}
static int
ext2_xattr_get_acl_default(struct inode *inode, const char *name,
void *buffer, size_t size)
{
if (strcmp(name, "") != 0)
return -EINVAL;
return ext2_xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
}
static int
ext2_xattr_set_acl(struct inode *inode, int type, const void *value,
size_t size)
ext2_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags, int type)
{
struct posix_acl *acl;
int error;
if (!test_opt(inode->i_sb, POSIX_ACL))
if (strcmp(name, "") != 0)
return -EINVAL;
if (!test_opt(dentry->d_sb, POSIX_ACL))
return -EOPNOTSUPP;
if (!is_owner_or_cap(inode))
if (!is_owner_or_cap(dentry->d_inode))
return -EPERM;
if (value) {
@ -426,41 +413,25 @@ ext2_xattr_set_acl(struct inode *inode, int type, const void *value,
} else
acl = NULL;
error = ext2_set_acl(inode, type, acl);
error = ext2_set_acl(dentry->d_inode, type, acl);
release_and_out:
posix_acl_release(acl);
return error;
}
static int
ext2_xattr_set_acl_access(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
if (strcmp(name, "") != 0)
return -EINVAL;
return ext2_xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
}
static int
ext2_xattr_set_acl_default(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
if (strcmp(name, "") != 0)
return -EINVAL;
return ext2_xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
}
struct xattr_handler ext2_xattr_acl_access_handler = {
.prefix = POSIX_ACL_XATTR_ACCESS,
.flags = ACL_TYPE_ACCESS,
.list = ext2_xattr_list_acl_access,
.get = ext2_xattr_get_acl_access,
.set = ext2_xattr_set_acl_access,
.get = ext2_xattr_get_acl,
.set = ext2_xattr_set_acl,
};
struct xattr_handler ext2_xattr_acl_default_handler = {
.prefix = POSIX_ACL_XATTR_DEFAULT,
.flags = ACL_TYPE_DEFAULT,
.list = ext2_xattr_list_acl_default,
.get = ext2_xattr_get_acl_default,
.set = ext2_xattr_set_acl_default,
.get = ext2_xattr_get_acl,
.set = ext2_xattr_set_acl,
};

11
fs/ext2/xattr.c
View file

@ -60,6 +60,7 @@
#include <linux/mbcache.h>
#include <linux/quotaops.h>
#include <linux/rwsem.h>
#include <linux/security.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"
@ -249,8 +250,9 @@ cleanup:
* used / required on success.
*/
static int
ext2_xattr_list(struct inode *inode, char *buffer, size_t buffer_size)
ext2_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size)
{
struct inode *inode = dentry->d_inode;
struct buffer_head *bh = NULL;
struct ext2_xattr_entry *entry;
char *end;
@ -300,9 +302,10 @@ bad_block: ext2_error(inode->i_sb, "ext2_xattr_list",
ext2_xattr_handler(entry->e_name_index);
if (handler) {
size_t size = handler->list(inode, buffer, rest,
size_t size = handler->list(dentry, buffer, rest,
entry->e_name,
entry->e_name_len);
entry->e_name_len,
handler->flags);
if (buffer) {
if (size > rest) {
error = -ERANGE;
@ -330,7 +333,7 @@ cleanup:
ssize_t
ext2_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
return ext2_xattr_list(dentry->d_inode, buffer, size);
return ext2_xattr_list(dentry, buffer, size);
}
/*

16
fs/ext2/xattr_security.c
View file

@ -11,8 +11,8 @@
#include "xattr.h"
static size_t
ext2_xattr_security_list(struct inode *inode, char *list, size_t list_size,
const char *name, size_t name_len)
ext2_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
const char *name, size_t name_len, int type)
{
const int prefix_len = XATTR_SECURITY_PREFIX_LEN;
const size_t total_len = prefix_len + name_len + 1;
@ -26,22 +26,22 @@ ext2_xattr_security_list(struct inode *inode, char *list, size_t list_size,
}
static int
ext2_xattr_security_get(struct inode *inode, const char *name,
void *buffer, size_t size)
ext2_xattr_security_get(struct dentry *dentry, const char *name,
void *buffer, size_t size, int type)
{
if (strcmp(name, "") == 0)
return -EINVAL;
return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,
return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
buffer, size);
}
static int
ext2_xattr_security_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
ext2_xattr_security_set(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags, int type)
{
if (strcmp(name, "") == 0)
return -EINVAL;
return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name,
return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
value, size, flags);
}

16
fs/ext2/xattr_trusted.c
View file

@ -13,8 +13,8 @@
#include "xattr.h"
static size_t
ext2_xattr_trusted_list(struct inode *inode, char *list, size_t list_size,
const char *name, size_t name_len)
ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
const char *name, size_t name_len, int type)
{
const int prefix_len = XATTR_TRUSTED_PREFIX_LEN;
const size_t total_len = prefix_len + name_len + 1;
@ -31,22 +31,22 @@ ext2_xattr_trusted_list(struct inode *inode, char *list, size_t list_size,
}
static int
ext2_xattr_trusted_get(struct inode *inode, const char *name,
void *buffer, size_t size)
ext2_xattr_trusted_get(struct dentry *dentry, const char *name,
void *buffer, size_t size, int type)
{
if (strcmp(name, "") == 0)
return -EINVAL;
return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name,
return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
buffer, size);
}
static int
ext2_xattr_trusted_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
ext2_xattr_trusted_set(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags, int type)
{
if (strcmp(name, "") == 0)
return -EINVAL;
return ext2_xattr_set(inode, EXT2_XATTR_INDEX_TRUSTED, name,
return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
value, size, flags);
}

25
fs/ext2/xattr_user.c
View file

@ -12,13 +12,13 @@
#include "xattr.h"
static size_t
ext2_xattr_user_list(struct inode *inode, char *list, size_t list_size,
const char *name, size_t name_len)
ext2_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
const char *name, size_t name_len, int type)
{
const size_t prefix_len = XATTR_USER_PREFIX_LEN;
const size_t total_len = prefix_len + name_len + 1;
if (!test_opt(inode->i_sb, XATTR_USER))
if (!test_opt(dentry->d_sb, XATTR_USER))
return 0;
if (list && total_len <= list_size) {
@ -30,27 +30,28 @@ ext2_xattr_user_list(struct inode *inode, char *list, size_t list_size,
}
static int
ext2_xattr_user_get(struct inode *inode, const char *name,
void *buffer, size_t size)
ext2_xattr_user_get(struct dentry *dentry, const char *name,
void *buffer, size_t size, int type)
{
if (strcmp(name, "") == 0)
return -EINVAL;
if (!test_opt(inode->i_sb, XATTR_USER))
if (!test_opt(dentry->d_sb, XATTR_USER))
return -EOPNOTSUPP;
return ext2_xattr_get(inode, EXT2_XATTR_INDEX_USER, name, buffer, size);
return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_USER,
name, buffer, size);
}
static int
ext2_xattr_user_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
ext2_xattr_user_set(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags, int type)
{
if (strcmp(name, "") == 0)
return -EINVAL;
if (!test_opt(inode->i_sb, XATTR_USER))
if (!test_opt(dentry->d_sb, XATTR_USER))
return -EOPNOTSUPP;
return ext2_xattr_set(inode, EXT2_XATTR_INDEX_USER, name,
value, size, flags);
return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_USER,
name, value, size, flags);
}
struct xattr_handler ext2_xattr_user_handler = {