Initial commit
This commit is contained in:
Ole André Vadla Ravnås
commit
169c65d57e
51358 changed files with 23120455 additions and 0 deletions
429
fs/jffs2/acl.c
Normal file
429
fs/jffs2/acl.c
Normal file
|
|
@ -0,0 +1,429 @@
|
|||
/*
|
||||
* JFFS2 -- Journalling Flash File System, Version 2.
|
||||
*
|
||||
* Copyright © 2006 NEC Corporation
|
||||
*
|
||||
* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
|
||||
*
|
||||
* For licensing information, see the file 'LICENCE' in this directory.
|
||||
*
|
||||
*/
|
||||
|
||||
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/time.h>
|
||||
#include <linux/crc32.h>
|
||||
#include <linux/jffs2.h>
|
||||
#include <linux/xattr.h>
|
||||
#include <linux/posix_acl_xattr.h>
|
||||
#include <linux/mtd/mtd.h>
|
||||
#include "nodelist.h"
|
||||
|
||||
static size_t jffs2_acl_size(int count)
|
||||
{
|
||||
if (count <= 4) {
|
||||
return sizeof(struct jffs2_acl_header)
|
||||
+ count * sizeof(struct jffs2_acl_entry_short);
|
||||
} else {
|
||||
return sizeof(struct jffs2_acl_header)
|
||||
+ 4 * sizeof(struct jffs2_acl_entry_short)
|
||||
+ (count - 4) * sizeof(struct jffs2_acl_entry);
|
||||
}
|
||||
}
|
||||
|
||||
static int jffs2_acl_count(size_t size)
|
||||
{
|
||||
size_t s;
|
||||
|
||||
size -= sizeof(struct jffs2_acl_header);
|
||||
if (size < 4 * sizeof(struct jffs2_acl_entry_short)) {
|
||||
if (size % sizeof(struct jffs2_acl_entry_short))
|
||||
return -1;
|
||||
return size / sizeof(struct jffs2_acl_entry_short);
|
||||
} else {
|
||||
s = size - 4 * sizeof(struct jffs2_acl_entry_short);
|
||||
if (s % sizeof(struct jffs2_acl_entry))
|
||||
return -1;
|
||||
return s / sizeof(struct jffs2_acl_entry) + 4;
|
||||
}
|
||||
}
|
||||
|
||||
static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size)
|
||||
{
|
||||
void *end = value + size;
|
||||
struct jffs2_acl_header *header = value;
|
||||
struct jffs2_acl_entry *entry;
|
||||
struct posix_acl *acl;
|
||||
uint32_t ver;
|
||||
int i, count;
|
||||
|
||||
if (!value)
|
||||
return NULL;
|
||||
if (size < sizeof(struct jffs2_acl_header))
|
||||
return ERR_PTR(-EINVAL);
|
||||
ver = je32_to_cpu(header->a_version);
|
||||
if (ver != JFFS2_ACL_VERSION) {
|
||||
JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver);
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
|
||||
value += sizeof(struct jffs2_acl_header);
|
||||
count = jffs2_acl_count(size);
|
||||
if (count < 0)
|
||||
return ERR_PTR(-EINVAL);
|
||||
if (count == 0)
|
||||
return NULL;
|
||||
|
||||
acl = posix_acl_alloc(count, GFP_KERNEL);
|
||||
if (!acl)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
for (i=0; i < count; i++) {
|
||||
entry = value;
|
||||
if (value + sizeof(struct jffs2_acl_entry_short) > end)
|
||||
goto fail;
|
||||
acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag);
|
||||
acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm);
|
||||
switch (acl->a_entries[i].e_tag) {
|
||||
case ACL_USER_OBJ:
|
||||
case ACL_GROUP_OBJ:
|
||||
case ACL_MASK:
|
||||
case ACL_OTHER:
|
||||
value += sizeof(struct jffs2_acl_entry_short);
|
||||
break;
|
||||
|
||||
case ACL_USER:
|
||||
value += sizeof(struct jffs2_acl_entry);
|
||||
if (value > end)
|
||||
goto fail;
|
||||
acl->a_entries[i].e_uid =
|
||||
make_kuid(&init_user_ns,
|
||||
je32_to_cpu(entry->e_id));
|
||||
break;
|
||||
case ACL_GROUP:
|
||||
value += sizeof(struct jffs2_acl_entry);
|
||||
if (value > end)
|
||||
goto fail;
|
||||
acl->a_entries[i].e_gid =
|
||||
make_kgid(&init_user_ns,
|
||||
je32_to_cpu(entry->e_id));
|
||||
break;
|
||||
|
||||
default:
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
if (value != end)
|
||||
goto fail;
|
||||
return acl;
|
||||
fail:
|
||||
posix_acl_release(acl);
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
|
||||
static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size)
|
||||
{
|
||||
struct jffs2_acl_header *header;
|
||||
struct jffs2_acl_entry *entry;
|
||||
void *e;
|
||||
size_t i;
|
||||
|
||||
*size = jffs2_acl_size(acl->a_count);
|
||||
header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL);
|
||||
if (!header)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
header->a_version = cpu_to_je32(JFFS2_ACL_VERSION);
|
||||
e = header + 1;
|
||||
for (i=0; i < acl->a_count; i++) {
|
||||
const struct posix_acl_entry *acl_e = &acl->a_entries[i];
|
||||
entry = e;
|
||||
entry->e_tag = cpu_to_je16(acl_e->e_tag);
|
||||
entry->e_perm = cpu_to_je16(acl_e->e_perm);
|
||||
switch(acl_e->e_tag) {
|
||||
case ACL_USER:
|
||||
entry->e_id = cpu_to_je32(
|
||||
from_kuid(&init_user_ns, acl_e->e_uid));
|
||||
e += sizeof(struct jffs2_acl_entry);
|
||||
break;
|
||||
case ACL_GROUP:
|
||||
entry->e_id = cpu_to_je32(
|
||||
from_kgid(&init_user_ns, acl_e->e_gid));
|
||||
e += sizeof(struct jffs2_acl_entry);
|
||||
break;
|
||||
|
||||
case ACL_USER_OBJ:
|
||||
case ACL_GROUP_OBJ:
|
||||
case ACL_MASK:
|
||||
case ACL_OTHER:
|
||||
e += sizeof(struct jffs2_acl_entry_short);
|
||||
break;
|
||||
|
||||
default:
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
return header;
|
||||
fail:
|
||||
kfree(header);
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
|
||||
struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
|
||||
{
|
||||
struct posix_acl *acl;
|
||||
char *value = NULL;
|
||||
int rc, xprefix;
|
||||
|
||||
acl = get_cached_acl(inode, type);
|
||||
if (acl != ACL_NOT_CACHED)
|
||||
return acl;
|
||||
|
||||
switch (type) {
|
||||
case ACL_TYPE_ACCESS:
|
||||
xprefix = JFFS2_XPREFIX_ACL_ACCESS;
|
||||
break;
|
||||
case ACL_TYPE_DEFAULT:
|
||||
xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
|
||||
break;
|
||||
default:
|
||||
BUG();
|
||||
}
|
||||
rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0);
|
||||
if (rc > 0) {
|
||||
value = kmalloc(rc, GFP_KERNEL);
|
||||
if (!value)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
rc = do_jffs2_getxattr(inode, xprefix, "", value, rc);
|
||||
}
|
||||
if (rc > 0) {
|
||||
acl = jffs2_acl_from_medium(value, rc);
|
||||
} else if (rc == -ENODATA || rc == -ENOSYS) {
|
||||
acl = NULL;
|
||||
} else {
|
||||
acl = ERR_PTR(rc);
|
||||
}
|
||||
if (value)
|
||||
kfree(value);
|
||||
if (!IS_ERR(acl))
|
||||
set_cached_acl(inode, type, acl);
|
||||
return acl;
|
||||
}
|
||||
|
||||
static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl)
|
||||
{
|
||||
char *value = NULL;
|
||||
size_t size = 0;
|
||||
int rc;
|
||||
|
||||
if (acl) {
|
||||
value = jffs2_acl_to_medium(acl, &size);
|
||||
if (IS_ERR(value))
|
||||
return PTR_ERR(value);
|
||||
}
|
||||
rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
|
||||
if (!value && rc == -ENODATA)
|
||||
rc = 0;
|
||||
kfree(value);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
|
||||
{
|
||||
int rc, xprefix;
|
||||
|
||||
if (S_ISLNK(inode->i_mode))
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
switch (type) {
|
||||
case ACL_TYPE_ACCESS:
|
||||
xprefix = JFFS2_XPREFIX_ACL_ACCESS;
|
||||
if (acl) {
|
||||
umode_t mode = inode->i_mode;
|
||||
rc = posix_acl_equiv_mode(acl, &mode);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
if (inode->i_mode != mode) {
|
||||
struct iattr attr;
|
||||
|
||||
attr.ia_valid = ATTR_MODE | ATTR_CTIME;
|
||||
attr.ia_mode = mode;
|
||||
attr.ia_ctime = CURRENT_TIME_SEC;
|
||||
rc = jffs2_do_setattr(inode, &attr);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
}
|
||||
if (rc == 0)
|
||||
acl = NULL;
|
||||
}
|
||||
break;
|
||||
case ACL_TYPE_DEFAULT:
|
||||
xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
|
||||
if (!S_ISDIR(inode->i_mode))
|
||||
return acl ? -EACCES : 0;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
rc = __jffs2_set_acl(inode, xprefix, acl);
|
||||
if (!rc)
|
||||
set_cached_acl(inode, type, acl);
|
||||
return rc;
|
||||
}
|
||||
|
||||
int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode)
|
||||
{
|
||||
struct posix_acl *acl;
|
||||
int rc;
|
||||
|
||||
cache_no_acl(inode);
|
||||
|
||||
if (S_ISLNK(*i_mode))
|
||||
return 0; /* Symlink always has no-ACL */
|
||||
|
||||
acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT);
|
||||
if (IS_ERR(acl))
|
||||
return PTR_ERR(acl);
|
||||
|
||||
if (!acl) {
|
||||
*i_mode &= ~current_umask();
|
||||
} else {
|
||||
if (S_ISDIR(*i_mode))
|
||||
set_cached_acl(inode, ACL_TYPE_DEFAULT, acl);
|
||||
|
||||
rc = posix_acl_create(&acl, GFP_KERNEL, i_mode);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
if (rc > 0)
|
||||
set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
|
||||
|
||||
posix_acl_release(acl);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int jffs2_init_acl_post(struct inode *inode)
|
||||
{
|
||||
int rc;
|
||||
|
||||
if (inode->i_default_acl) {
|
||||
rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl);
|
||||
if (rc)
|
||||
return rc;
|
||||
}
|
||||
|
||||
if (inode->i_acl) {
|
||||
rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl);
|
||||
if (rc)
|
||||
return rc;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int jffs2_acl_chmod(struct inode *inode)
|
||||
{
|
||||
struct posix_acl *acl;
|
||||
int rc;
|
||||
|
||||
if (S_ISLNK(inode->i_mode))
|
||||
return -EOPNOTSUPP;
|
||||
acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS);
|
||||
if (IS_ERR(acl) || !acl)
|
||||
return PTR_ERR(acl);
|
||||
rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
|
||||
if (rc)
|
||||
return rc;
|
||||
rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, acl);
|
||||
posix_acl_release(acl);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static size_t jffs2_acl_access_listxattr(struct dentry *dentry, char *list,
|
||||
size_t list_size, const char *name, size_t name_len, int type)
|
||||
{
|
||||
const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS);
|
||||
|
||||
if (list && retlen <= list_size)
|
||||
strcpy(list, POSIX_ACL_XATTR_ACCESS);
|
||||
return retlen;
|
||||
}
|
||||
|
||||
static size_t jffs2_acl_default_listxattr(struct dentry *dentry, char *list,
|
||||
size_t list_size, const char *name, size_t name_len, int type)
|
||||
{
|
||||
const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT);
|
||||
|
||||
if (list && retlen <= list_size)
|
||||
strcpy(list, POSIX_ACL_XATTR_DEFAULT);
|
||||
return retlen;
|
||||
}
|
||||
|
||||
static int jffs2_acl_getxattr(struct dentry *dentry, const char *name,
|
||||
void *buffer, size_t size, int type)
|
||||
{
|
||||
struct posix_acl *acl;
|
||||
int rc;
|
||||
|
||||
if (name[0] != '\0')
|
||||
return -EINVAL;
|
||||
|
||||
acl = jffs2_get_acl(dentry->d_inode, type);
|
||||
if (IS_ERR(acl))
|
||||
return PTR_ERR(acl);
|
||||
if (!acl)
|
||||
return -ENODATA;
|
||||
rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
|
||||
posix_acl_release(acl);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int jffs2_acl_setxattr(struct dentry *dentry, const char *name,
|
||||
const void *value, size_t size, int flags, int type)
|
||||
{
|
||||
struct posix_acl *acl;
|
||||
int rc;
|
||||
|
||||
if (name[0] != '\0')
|
||||
return -EINVAL;
|
||||
if (!inode_owner_or_capable(dentry->d_inode))
|
||||
return -EPERM;
|
||||
|
||||
if (value) {
|
||||
acl = posix_acl_from_xattr(&init_user_ns, value, size);
|
||||
if (IS_ERR(acl))
|
||||
return PTR_ERR(acl);
|
||||
if (acl) {
|
||||
rc = posix_acl_valid(acl);
|
||||
if (rc)
|
||||
goto out;
|
||||
}
|
||||
} else {
|
||||
acl = NULL;
|
||||
}
|
||||
rc = jffs2_set_acl(dentry->d_inode, type, acl);
|
||||
out:
|
||||
posix_acl_release(acl);
|
||||
return rc;
|
||||
}
|
||||
|
||||
const struct xattr_handler jffs2_acl_access_xattr_handler = {
|
||||
.prefix = POSIX_ACL_XATTR_ACCESS,
|
||||
.flags = ACL_TYPE_DEFAULT,
|
||||
.list = jffs2_acl_access_listxattr,
|
||||
.get = jffs2_acl_getxattr,
|
||||
.set = jffs2_acl_setxattr,
|
||||
};
|
||||
|
||||
const struct xattr_handler jffs2_acl_default_xattr_handler = {
|
||||
.prefix = POSIX_ACL_XATTR_DEFAULT,
|
||||
.flags = ACL_TYPE_DEFAULT,
|
||||
.list = jffs2_acl_default_listxattr,
|
||||
.get = jffs2_acl_getxattr,
|
||||
.set = jffs2_acl_setxattr,
|
||||
};
|
||||
Loading…
Add table
Add a link
Reference in a new issue