/*
|
/*
|
* binfmt_misc.c
|
* binfmt_misc.c
|
*
|
*
|
* Copyright (C) 1997 Richard Günther
|
* Copyright (C) 1997 Richard Günther
|
*
|
*
|
* binfmt_misc detects binaries via a magic or filename extension and invokes
|
* binfmt_misc detects binaries via a magic or filename extension and invokes
|
* a specified wrapper. This should obsolete binfmt_java, binfmt_em86 and
|
* a specified wrapper. This should obsolete binfmt_java, binfmt_em86 and
|
* binfmt_mz.
|
* binfmt_mz.
|
*
|
*
|
* 1997-04-25 first version
|
* 1997-04-25 first version
|
* [...]
|
* [...]
|
* 1997-05-19 cleanup
|
* 1997-05-19 cleanup
|
* 1997-06-26 hpa: pass the real filename rather than argv[0]
|
* 1997-06-26 hpa: pass the real filename rather than argv[0]
|
* 1997-06-30 minor cleanup
|
* 1997-06-30 minor cleanup
|
* 1997-08-09 removed extension stripping, locking cleanup
|
* 1997-08-09 removed extension stripping, locking cleanup
|
* 2001-02-28 AV: rewritten into something that resembles C. Original didn't.
|
* 2001-02-28 AV: rewritten into something that resembles C. Original didn't.
|
*/
|
*/
|
|
|
#include <linux/module.h>
|
#include <linux/module.h>
|
#include <linux/init.h>
|
#include <linux/init.h>
|
|
|
#include <linux/binfmts.h>
|
#include <linux/binfmts.h>
|
#include <linux/slab.h>
|
#include <linux/slab.h>
|
#include <linux/ctype.h>
|
#include <linux/ctype.h>
|
#include <linux/file.h>
|
#include <linux/file.h>
|
#include <linux/pagemap.h>
|
#include <linux/pagemap.h>
|
|
|
#include <asm/uaccess.h>
|
#include <asm/uaccess.h>
|
|
|
enum {
|
enum {
|
VERBOSE_STATUS = 1 /* make it zero to save 400 bytes kernel memory */
|
VERBOSE_STATUS = 1 /* make it zero to save 400 bytes kernel memory */
|
};
|
};
|
|
|
static LIST_HEAD(entries);
|
static LIST_HEAD(entries);
|
static int enabled = 1;
|
static int enabled = 1;
|
|
|
enum {Enabled, Magic};
|
enum {Enabled, Magic};
|
|
|
typedef struct {
|
typedef struct {
|
struct list_head list;
|
struct list_head list;
|
unsigned long flags; /* type, status, etc. */
|
unsigned long flags; /* type, status, etc. */
|
int offset; /* offset of magic */
|
int offset; /* offset of magic */
|
int size; /* size of magic/mask */
|
int size; /* size of magic/mask */
|
char *magic; /* magic or filename extension */
|
char *magic; /* magic or filename extension */
|
char *mask; /* mask, NULL for exact match */
|
char *mask; /* mask, NULL for exact match */
|
char *interpreter; /* filename of interpreter */
|
char *interpreter; /* filename of interpreter */
|
char *name;
|
char *name;
|
struct dentry *dentry;
|
struct dentry *dentry;
|
} Node;
|
} Node;
|
|
|
static rwlock_t entries_lock __attribute__((unused)) = RW_LOCK_UNLOCKED;
|
static rwlock_t entries_lock __attribute__((unused)) = RW_LOCK_UNLOCKED;
|
|
|
/*
|
/*
|
* Check if we support the binfmt
|
* Check if we support the binfmt
|
* if we do, return the node, else NULL
|
* if we do, return the node, else NULL
|
* locking is done in load_misc_binary
|
* locking is done in load_misc_binary
|
*/
|
*/
|
static Node *check_file(struct linux_binprm *bprm)
|
static Node *check_file(struct linux_binprm *bprm)
|
{
|
{
|
char *p = strrchr(bprm->filename, '.');
|
char *p = strrchr(bprm->filename, '.');
|
struct list_head *l;
|
struct list_head *l;
|
|
|
for (l = entries.next; l != &entries; l = l->next) {
|
for (l = entries.next; l != &entries; l = l->next) {
|
Node *e = list_entry(l, Node, list);
|
Node *e = list_entry(l, Node, list);
|
char *s;
|
char *s;
|
int j;
|
int j;
|
|
|
if (!test_bit(Enabled, &e->flags))
|
if (!test_bit(Enabled, &e->flags))
|
continue;
|
continue;
|
|
|
if (!test_bit(Magic, &e->flags)) {
|
if (!test_bit(Magic, &e->flags)) {
|
if (p && !strcmp(e->magic, p + 1))
|
if (p && !strcmp(e->magic, p + 1))
|
return e;
|
return e;
|
continue;
|
continue;
|
}
|
}
|
|
|
s = bprm->buf + e->offset;
|
s = bprm->buf + e->offset;
|
if (e->mask) {
|
if (e->mask) {
|
for (j = 0; j < e->size; j++)
|
for (j = 0; j < e->size; j++)
|
if ((*s++ ^ e->magic[j]) & e->mask[j])
|
if ((*s++ ^ e->magic[j]) & e->mask[j])
|
break;
|
break;
|
} else {
|
} else {
|
for (j = 0; j < e->size; j++)
|
for (j = 0; j < e->size; j++)
|
if ((*s++ ^ e->magic[j]))
|
if ((*s++ ^ e->magic[j]))
|
break;
|
break;
|
}
|
}
|
if (j == e->size)
|
if (j == e->size)
|
return e;
|
return e;
|
}
|
}
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/*
|
/*
|
* the loader itself
|
* the loader itself
|
*/
|
*/
|
static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs)
|
static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs)
|
{
|
{
|
Node *fmt;
|
Node *fmt;
|
struct file * file;
|
struct file * file;
|
char iname[BINPRM_BUF_SIZE];
|
char iname[BINPRM_BUF_SIZE];
|
char *iname_addr = iname;
|
char *iname_addr = iname;
|
int retval;
|
int retval;
|
|
|
retval = -ENOEXEC;
|
retval = -ENOEXEC;
|
if (!enabled)
|
if (!enabled)
|
goto _ret;
|
goto _ret;
|
|
|
/* to keep locking time low, we copy the interpreter string */
|
/* to keep locking time low, we copy the interpreter string */
|
read_lock(&entries_lock);
|
read_lock(&entries_lock);
|
fmt = check_file(bprm);
|
fmt = check_file(bprm);
|
if (fmt) {
|
if (fmt) {
|
strncpy(iname, fmt->interpreter, BINPRM_BUF_SIZE - 1);
|
strncpy(iname, fmt->interpreter, BINPRM_BUF_SIZE - 1);
|
iname[BINPRM_BUF_SIZE - 1] = '\0';
|
iname[BINPRM_BUF_SIZE - 1] = '\0';
|
}
|
}
|
read_unlock(&entries_lock);
|
read_unlock(&entries_lock);
|
if (!fmt)
|
if (!fmt)
|
goto _ret;
|
goto _ret;
|
|
|
allow_write_access(bprm->file);
|
allow_write_access(bprm->file);
|
fput(bprm->file);
|
fput(bprm->file);
|
bprm->file = NULL;
|
bprm->file = NULL;
|
|
|
/* Build args for interpreter */
|
/* Build args for interpreter */
|
remove_arg_zero(bprm);
|
remove_arg_zero(bprm);
|
retval = copy_strings_kernel(1, &bprm->filename, bprm);
|
retval = copy_strings_kernel(1, &bprm->filename, bprm);
|
if (retval < 0) goto _ret;
|
if (retval < 0) goto _ret;
|
bprm->argc++;
|
bprm->argc++;
|
retval = copy_strings_kernel(1, &iname_addr, bprm);
|
retval = copy_strings_kernel(1, &iname_addr, bprm);
|
if (retval < 0) goto _ret;
|
if (retval < 0) goto _ret;
|
bprm->argc++;
|
bprm->argc++;
|
bprm->filename = iname; /* for binfmt_script */
|
bprm->filename = iname; /* for binfmt_script */
|
|
|
file = open_exec(iname);
|
file = open_exec(iname);
|
retval = PTR_ERR(file);
|
retval = PTR_ERR(file);
|
if (IS_ERR(file))
|
if (IS_ERR(file))
|
goto _ret;
|
goto _ret;
|
bprm->file = file;
|
bprm->file = file;
|
|
|
retval = prepare_binprm(bprm);
|
retval = prepare_binprm(bprm);
|
if (retval >= 0)
|
if (retval >= 0)
|
retval = search_binary_handler(bprm, regs);
|
retval = search_binary_handler(bprm, regs);
|
_ret:
|
_ret:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Command parsers */
|
/* Command parsers */
|
|
|
/*
|
/*
|
* parses and copies one argument enclosed in del from *sp to *dp,
|
* parses and copies one argument enclosed in del from *sp to *dp,
|
* recognising the \x special.
|
* recognising the \x special.
|
* returns pointer to the copied argument or NULL in case of an
|
* returns pointer to the copied argument or NULL in case of an
|
* error (and sets err) or null argument length.
|
* error (and sets err) or null argument length.
|
*/
|
*/
|
static char *scanarg(char *s, char del)
|
static char *scanarg(char *s, char del)
|
{
|
{
|
char c;
|
char c;
|
|
|
while ((c = *s++) != del) {
|
while ((c = *s++) != del) {
|
if (c == '\\' && *s == 'x') {
|
if (c == '\\' && *s == 'x') {
|
s++;
|
s++;
|
if (!isxdigit(*s++))
|
if (!isxdigit(*s++))
|
return NULL;
|
return NULL;
|
if (!isxdigit(*s++))
|
if (!isxdigit(*s++))
|
return NULL;
|
return NULL;
|
}
|
}
|
}
|
}
|
return s;
|
return s;
|
}
|
}
|
|
|
static int unquote(char *from)
|
static int unquote(char *from)
|
{
|
{
|
char c = 0, *s = from, *p = from;
|
char c = 0, *s = from, *p = from;
|
|
|
while ((c = *s++) != '\0') {
|
while ((c = *s++) != '\0') {
|
if (c == '\\' && *s == 'x') {
|
if (c == '\\' && *s == 'x') {
|
s++;
|
s++;
|
c = toupper(*s++);
|
c = toupper(*s++);
|
*p = (c - (isdigit(c) ? '0' : 'A' - 10)) << 4;
|
*p = (c - (isdigit(c) ? '0' : 'A' - 10)) << 4;
|
c = toupper(*s++);
|
c = toupper(*s++);
|
*p++ |= c - (isdigit(c) ? '0' : 'A' - 10);
|
*p++ |= c - (isdigit(c) ? '0' : 'A' - 10);
|
continue;
|
continue;
|
}
|
}
|
*p++ = c;
|
*p++ = c;
|
}
|
}
|
return p - from;
|
return p - from;
|
}
|
}
|
|
|
/*
|
/*
|
* This registers a new binary format, it recognises the syntax
|
* This registers a new binary format, it recognises the syntax
|
* ':name:type:offset:magic:mask:interpreter:'
|
* ':name:type:offset:magic:mask:interpreter:'
|
* where the ':' is the IFS, that can be chosen with the first char
|
* where the ':' is the IFS, that can be chosen with the first char
|
*/
|
*/
|
static Node *create_entry(const char *buffer, size_t count)
|
static Node *create_entry(const char *buffer, size_t count)
|
{
|
{
|
Node *e;
|
Node *e;
|
int memsize, err;
|
int memsize, err;
|
char *buf, *p;
|
char *buf, *p;
|
char del;
|
char del;
|
|
|
/* some sanity checks */
|
/* some sanity checks */
|
err = -EINVAL;
|
err = -EINVAL;
|
if ((count < 11) || (count > 256))
|
if ((count < 11) || (count > 256))
|
goto out;
|
goto out;
|
|
|
err = -ENOMEM;
|
err = -ENOMEM;
|
memsize = sizeof(Node) + count + 8;
|
memsize = sizeof(Node) + count + 8;
|
e = (Node *) kmalloc(memsize, GFP_USER);
|
e = (Node *) kmalloc(memsize, GFP_USER);
|
if (!e)
|
if (!e)
|
goto out;
|
goto out;
|
|
|
p = buf = (char *)e + sizeof(Node);
|
p = buf = (char *)e + sizeof(Node);
|
|
|
memset(e, 0, sizeof(Node));
|
memset(e, 0, sizeof(Node));
|
if (copy_from_user(buf, buffer, count))
|
if (copy_from_user(buf, buffer, count))
|
goto Efault;
|
goto Efault;
|
|
|
del = *p++; /* delimeter */
|
del = *p++; /* delimeter */
|
|
|
memset(buf+count, del, 8);
|
memset(buf+count, del, 8);
|
|
|
e->name = p;
|
e->name = p;
|
p = strchr(p, del);
|
p = strchr(p, del);
|
if (!p)
|
if (!p)
|
goto Einval;
|
goto Einval;
|
*p++ = '\0';
|
*p++ = '\0';
|
if (!e->name[0] ||
|
if (!e->name[0] ||
|
!strcmp(e->name, ".") ||
|
!strcmp(e->name, ".") ||
|
!strcmp(e->name, "..") ||
|
!strcmp(e->name, "..") ||
|
strchr(e->name, '/'))
|
strchr(e->name, '/'))
|
goto Einval;
|
goto Einval;
|
switch (*p++) {
|
switch (*p++) {
|
case 'E': e->flags = 1<<Enabled; break;
|
case 'E': e->flags = 1<<Enabled; break;
|
case 'M': e->flags = (1<<Enabled) | (1<<Magic); break;
|
case 'M': e->flags = (1<<Enabled) | (1<<Magic); break;
|
default: goto Einval;
|
default: goto Einval;
|
}
|
}
|
if (*p++ != del)
|
if (*p++ != del)
|
goto Einval;
|
goto Einval;
|
if (test_bit(Magic, &e->flags)) {
|
if (test_bit(Magic, &e->flags)) {
|
char *s = strchr(p, del);
|
char *s = strchr(p, del);
|
if (!s)
|
if (!s)
|
goto Einval;
|
goto Einval;
|
*s++ = '\0';
|
*s++ = '\0';
|
e->offset = simple_strtoul(p, &p, 10);
|
e->offset = simple_strtoul(p, &p, 10);
|
if (*p++)
|
if (*p++)
|
goto Einval;
|
goto Einval;
|
e->magic = p;
|
e->magic = p;
|
p = scanarg(p, del);
|
p = scanarg(p, del);
|
if (!p)
|
if (!p)
|
goto Einval;
|
goto Einval;
|
p[-1] = '\0';
|
p[-1] = '\0';
|
if (!e->magic[0])
|
if (!e->magic[0])
|
goto Einval;
|
goto Einval;
|
e->mask = p;
|
e->mask = p;
|
p = scanarg(p, del);
|
p = scanarg(p, del);
|
if (!p)
|
if (!p)
|
goto Einval;
|
goto Einval;
|
p[-1] = '\0';
|
p[-1] = '\0';
|
if (!e->mask[0])
|
if (!e->mask[0])
|
e->mask = NULL;
|
e->mask = NULL;
|
e->size = unquote(e->magic);
|
e->size = unquote(e->magic);
|
if (e->mask && unquote(e->mask) != e->size)
|
if (e->mask && unquote(e->mask) != e->size)
|
goto Einval;
|
goto Einval;
|
if (e->size + e->offset > BINPRM_BUF_SIZE)
|
if (e->size + e->offset > BINPRM_BUF_SIZE)
|
goto Einval;
|
goto Einval;
|
} else {
|
} else {
|
p = strchr(p, del);
|
p = strchr(p, del);
|
if (!p)
|
if (!p)
|
goto Einval;
|
goto Einval;
|
*p++ = '\0';
|
*p++ = '\0';
|
e->magic = p;
|
e->magic = p;
|
p = strchr(p, del);
|
p = strchr(p, del);
|
if (!p)
|
if (!p)
|
goto Einval;
|
goto Einval;
|
*p++ = '\0';
|
*p++ = '\0';
|
if (!e->magic[0] || strchr(e->magic, '/'))
|
if (!e->magic[0] || strchr(e->magic, '/'))
|
goto Einval;
|
goto Einval;
|
p = strchr(p, del);
|
p = strchr(p, del);
|
if (!p)
|
if (!p)
|
goto Einval;
|
goto Einval;
|
*p++ = '\0';
|
*p++ = '\0';
|
}
|
}
|
e->interpreter = p;
|
e->interpreter = p;
|
p = strchr(p, del);
|
p = strchr(p, del);
|
if (!p)
|
if (!p)
|
goto Einval;
|
goto Einval;
|
*p++ = '\0';
|
*p++ = '\0';
|
if (!e->interpreter[0])
|
if (!e->interpreter[0])
|
goto Einval;
|
goto Einval;
|
|
|
if (*p == '\n')
|
if (*p == '\n')
|
p++;
|
p++;
|
if (p != buf + count)
|
if (p != buf + count)
|
goto Einval;
|
goto Einval;
|
return e;
|
return e;
|
|
|
out:
|
out:
|
return ERR_PTR(err);
|
return ERR_PTR(err);
|
|
|
Efault:
|
Efault:
|
kfree(e);
|
kfree(e);
|
return ERR_PTR(-EFAULT);
|
return ERR_PTR(-EFAULT);
|
Einval:
|
Einval:
|
kfree(e);
|
kfree(e);
|
return ERR_PTR(-EINVAL);
|
return ERR_PTR(-EINVAL);
|
}
|
}
|
|
|
/*
|
/*
|
* Set status of entry/binfmt_misc:
|
* Set status of entry/binfmt_misc:
|
* '1' enables, '0' disables and '-1' clears entry/binfmt_misc
|
* '1' enables, '0' disables and '-1' clears entry/binfmt_misc
|
*/
|
*/
|
static int parse_command(const char *buffer, size_t count)
|
static int parse_command(const char *buffer, size_t count)
|
{
|
{
|
char s[4];
|
char s[4];
|
|
|
if (!count)
|
if (!count)
|
return 0;
|
return 0;
|
if (count > 3)
|
if (count > 3)
|
return -EINVAL;
|
return -EINVAL;
|
if (copy_from_user(s, buffer, count))
|
if (copy_from_user(s, buffer, count))
|
return -EFAULT;
|
return -EFAULT;
|
if (s[count-1] == '\n')
|
if (s[count-1] == '\n')
|
count--;
|
count--;
|
if (count == 1 && s[0] == '0')
|
if (count == 1 && s[0] == '0')
|
return 1;
|
return 1;
|
if (count == 1 && s[0] == '1')
|
if (count == 1 && s[0] == '1')
|
return 2;
|
return 2;
|
if (count == 2 && s[0] == '-' && s[1] == '1')
|
if (count == 2 && s[0] == '-' && s[1] == '1')
|
return 3;
|
return 3;
|
return -EINVAL;
|
return -EINVAL;
|
}
|
}
|
|
|
/* generic stuff */
|
/* generic stuff */
|
|
|
static void entry_status(Node *e, char *page)
|
static void entry_status(Node *e, char *page)
|
{
|
{
|
char *dp;
|
char *dp;
|
char *status = "disabled";
|
char *status = "disabled";
|
|
|
if (test_bit(Enabled, &e->flags))
|
if (test_bit(Enabled, &e->flags))
|
status = "enabled";
|
status = "enabled";
|
|
|
if (!VERBOSE_STATUS) {
|
if (!VERBOSE_STATUS) {
|
sprintf(page, "%s\n", status);
|
sprintf(page, "%s\n", status);
|
return;
|
return;
|
}
|
}
|
|
|
sprintf(page, "%s\ninterpreter %s\n", status, e->interpreter);
|
sprintf(page, "%s\ninterpreter %s\n", status, e->interpreter);
|
dp = page + strlen(page);
|
dp = page + strlen(page);
|
if (!test_bit(Magic, &e->flags)) {
|
if (!test_bit(Magic, &e->flags)) {
|
sprintf(dp, "extension .%s\n", e->magic);
|
sprintf(dp, "extension .%s\n", e->magic);
|
} else {
|
} else {
|
int i;
|
int i;
|
|
|
sprintf(dp, "offset %i\nmagic ", e->offset);
|
sprintf(dp, "offset %i\nmagic ", e->offset);
|
dp = page + strlen(page);
|
dp = page + strlen(page);
|
for (i = 0; i < e->size; i++) {
|
for (i = 0; i < e->size; i++) {
|
sprintf(dp, "%02x", 0xff & (int) (e->magic[i]));
|
sprintf(dp, "%02x", 0xff & (int) (e->magic[i]));
|
dp += 2;
|
dp += 2;
|
}
|
}
|
if (e->mask) {
|
if (e->mask) {
|
sprintf(dp, "\nmask ");
|
sprintf(dp, "\nmask ");
|
dp += 6;
|
dp += 6;
|
for (i = 0; i < e->size; i++) {
|
for (i = 0; i < e->size; i++) {
|
sprintf(dp, "%02x", 0xff & (int) (e->mask[i]));
|
sprintf(dp, "%02x", 0xff & (int) (e->mask[i]));
|
dp += 2;
|
dp += 2;
|
}
|
}
|
}
|
}
|
*dp++ = '\n';
|
*dp++ = '\n';
|
*dp = '\0';
|
*dp = '\0';
|
}
|
}
|
}
|
}
|
|
|
static struct inode *bm_get_inode(struct super_block *sb, int mode)
|
static struct inode *bm_get_inode(struct super_block *sb, int mode)
|
{
|
{
|
struct inode * inode = new_inode(sb);
|
struct inode * inode = new_inode(sb);
|
|
|
if (inode) {
|
if (inode) {
|
inode->i_mode = mode;
|
inode->i_mode = mode;
|
inode->i_uid = 0;
|
inode->i_uid = 0;
|
inode->i_gid = 0;
|
inode->i_gid = 0;
|
inode->i_blksize = PAGE_CACHE_SIZE;
|
inode->i_blksize = PAGE_CACHE_SIZE;
|
inode->i_blocks = 0;
|
inode->i_blocks = 0;
|
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
}
|
}
|
return inode;
|
return inode;
|
}
|
}
|
|
|
static void bm_clear_inode(struct inode *inode)
|
static void bm_clear_inode(struct inode *inode)
|
{
|
{
|
Node *e = inode->u.generic_ip;
|
Node *e = inode->u.generic_ip;
|
|
|
if (e) {
|
if (e) {
|
write_lock(&entries_lock);
|
write_lock(&entries_lock);
|
list_del(&e->list);
|
list_del(&e->list);
|
write_unlock(&entries_lock);
|
write_unlock(&entries_lock);
|
kfree(e);
|
kfree(e);
|
}
|
}
|
}
|
}
|
|
|
static void kill_node(Node *e)
|
static void kill_node(Node *e)
|
{
|
{
|
struct dentry *dentry;
|
struct dentry *dentry;
|
|
|
write_lock(&entries_lock);
|
write_lock(&entries_lock);
|
dentry = e->dentry;
|
dentry = e->dentry;
|
if (dentry) {
|
if (dentry) {
|
list_del(&e->list);
|
list_del(&e->list);
|
INIT_LIST_HEAD(&e->list);
|
INIT_LIST_HEAD(&e->list);
|
e->dentry = NULL;
|
e->dentry = NULL;
|
}
|
}
|
write_unlock(&entries_lock);
|
write_unlock(&entries_lock);
|
|
|
if (dentry) {
|
if (dentry) {
|
dentry->d_inode->i_nlink--;
|
dentry->d_inode->i_nlink--;
|
d_drop(dentry);
|
d_drop(dentry);
|
dput(dentry);
|
dput(dentry);
|
}
|
}
|
}
|
}
|
|
|
/* /<entry> */
|
/* /<entry> */
|
|
|
static ssize_t
|
static ssize_t
|
bm_entry_read(struct file * file, char * buf, size_t nbytes, loff_t *ppos)
|
bm_entry_read(struct file * file, char * buf, size_t nbytes, loff_t *ppos)
|
{
|
{
|
Node *e = file->f_dentry->d_inode->u.generic_ip;
|
Node *e = file->f_dentry->d_inode->u.generic_ip;
|
loff_t pos = *ppos;
|
loff_t pos = *ppos;
|
ssize_t res;
|
ssize_t res;
|
char *page;
|
char *page;
|
int len;
|
int len;
|
|
|
if (!(page = (char*) __get_free_page(GFP_KERNEL)))
|
if (!(page = (char*) __get_free_page(GFP_KERNEL)))
|
return -ENOMEM;
|
return -ENOMEM;
|
|
|
entry_status(e, page);
|
entry_status(e, page);
|
len = strlen(page);
|
len = strlen(page);
|
|
|
res = -EINVAL;
|
res = -EINVAL;
|
if (pos < 0)
|
if (pos < 0)
|
goto out;
|
goto out;
|
res = 0;
|
res = 0;
|
if (pos >= len)
|
if (pos >= len)
|
goto out;
|
goto out;
|
if (len < pos + nbytes)
|
if (len < pos + nbytes)
|
nbytes = len - pos;
|
nbytes = len - pos;
|
res = -EFAULT;
|
res = -EFAULT;
|
if (copy_to_user(buf, page + pos, nbytes))
|
if (copy_to_user(buf, page + pos, nbytes))
|
goto out;
|
goto out;
|
*ppos = pos + nbytes;
|
*ppos = pos + nbytes;
|
res = nbytes;
|
res = nbytes;
|
out:
|
out:
|
free_page((unsigned long) page);
|
free_page((unsigned long) page);
|
return res;
|
return res;
|
}
|
}
|
|
|
static ssize_t bm_entry_write(struct file *file, const char *buffer,
|
static ssize_t bm_entry_write(struct file *file, const char *buffer,
|
size_t count, loff_t *ppos)
|
size_t count, loff_t *ppos)
|
{
|
{
|
struct dentry *root;
|
struct dentry *root;
|
Node *e = file->f_dentry->d_inode->u.generic_ip;
|
Node *e = file->f_dentry->d_inode->u.generic_ip;
|
int res = parse_command(buffer, count);
|
int res = parse_command(buffer, count);
|
|
|
switch (res) {
|
switch (res) {
|
case 1: clear_bit(Enabled, &e->flags);
|
case 1: clear_bit(Enabled, &e->flags);
|
break;
|
break;
|
case 2: set_bit(Enabled, &e->flags);
|
case 2: set_bit(Enabled, &e->flags);
|
break;
|
break;
|
case 3: root = dget(file->f_vfsmnt->mnt_sb->s_root);
|
case 3: root = dget(file->f_vfsmnt->mnt_sb->s_root);
|
down(&root->d_inode->i_sem);
|
down(&root->d_inode->i_sem);
|
down(&root->d_inode->i_zombie);
|
down(&root->d_inode->i_zombie);
|
|
|
kill_node(e);
|
kill_node(e);
|
|
|
up(&root->d_inode->i_zombie);
|
up(&root->d_inode->i_zombie);
|
up(&root->d_inode->i_sem);
|
up(&root->d_inode->i_sem);
|
dput(root);
|
dput(root);
|
break;
|
break;
|
default: return res;
|
default: return res;
|
}
|
}
|
return count;
|
return count;
|
}
|
}
|
|
|
static struct file_operations bm_entry_operations = {
|
static struct file_operations bm_entry_operations = {
|
read: bm_entry_read,
|
read: bm_entry_read,
|
write: bm_entry_write,
|
write: bm_entry_write,
|
};
|
};
|
|
|
/* /register */
|
/* /register */
|
|
|
static ssize_t bm_register_write(struct file *file, const char *buffer,
|
static ssize_t bm_register_write(struct file *file, const char *buffer,
|
size_t count, loff_t *ppos)
|
size_t count, loff_t *ppos)
|
{
|
{
|
Node *e;
|
Node *e;
|
struct dentry *root, *dentry;
|
struct dentry *root, *dentry;
|
struct super_block *sb = file->f_vfsmnt->mnt_sb;
|
struct super_block *sb = file->f_vfsmnt->mnt_sb;
|
int err = 0;
|
int err = 0;
|
|
|
e = create_entry(buffer, count);
|
e = create_entry(buffer, count);
|
|
|
if (IS_ERR(e))
|
if (IS_ERR(e))
|
return PTR_ERR(e);
|
return PTR_ERR(e);
|
|
|
root = dget(sb->s_root);
|
root = dget(sb->s_root);
|
down(&root->d_inode->i_sem);
|
down(&root->d_inode->i_sem);
|
dentry = lookup_one_len(e->name, root, strlen(e->name));
|
dentry = lookup_one_len(e->name, root, strlen(e->name));
|
err = PTR_ERR(dentry);
|
err = PTR_ERR(dentry);
|
if (!IS_ERR(dentry)) {
|
if (!IS_ERR(dentry)) {
|
down(&root->d_inode->i_zombie);
|
down(&root->d_inode->i_zombie);
|
if (dentry->d_inode) {
|
if (dentry->d_inode) {
|
err = -EEXIST;
|
err = -EEXIST;
|
} else {
|
} else {
|
struct inode * inode = bm_get_inode(sb, S_IFREG | 0644);
|
struct inode * inode = bm_get_inode(sb, S_IFREG | 0644);
|
err = -ENOMEM;
|
err = -ENOMEM;
|
|
|
if (inode) {
|
if (inode) {
|
write_lock(&entries_lock);
|
write_lock(&entries_lock);
|
|
|
e->dentry = dget(dentry);
|
e->dentry = dget(dentry);
|
inode->u.generic_ip = e;
|
inode->u.generic_ip = e;
|
inode->i_fop = &bm_entry_operations;
|
inode->i_fop = &bm_entry_operations;
|
d_instantiate(dentry, inode);
|
d_instantiate(dentry, inode);
|
|
|
list_add(&e->list, &entries);
|
list_add(&e->list, &entries);
|
write_unlock(&entries_lock);
|
write_unlock(&entries_lock);
|
|
|
err = 0;
|
err = 0;
|
}
|
}
|
}
|
}
|
up(&root->d_inode->i_zombie);
|
up(&root->d_inode->i_zombie);
|
dput(dentry);
|
dput(dentry);
|
}
|
}
|
up(&root->d_inode->i_sem);
|
up(&root->d_inode->i_sem);
|
dput(root);
|
dput(root);
|
|
|
if (err) {
|
if (err) {
|
kfree(e);
|
kfree(e);
|
return -EINVAL;
|
return -EINVAL;
|
}
|
}
|
return count;
|
return count;
|
}
|
}
|
|
|
static struct file_operations bm_register_operations = {
|
static struct file_operations bm_register_operations = {
|
write: bm_register_write,
|
write: bm_register_write,
|
};
|
};
|
|
|
/* /status */
|
/* /status */
|
|
|
static ssize_t
|
static ssize_t
|
bm_status_read(struct file * file, char * buf, size_t nbytes, loff_t *ppos)
|
bm_status_read(struct file * file, char * buf, size_t nbytes, loff_t *ppos)
|
{
|
{
|
char *s = enabled ? "enabled" : "disabled";
|
char *s = enabled ? "enabled" : "disabled";
|
int len = strlen(s);
|
int len = strlen(s);
|
loff_t pos = *ppos;
|
loff_t pos = *ppos;
|
|
|
if (pos < 0)
|
if (pos < 0)
|
return -EINVAL;
|
return -EINVAL;
|
if (pos >= len)
|
if (pos >= len)
|
return 0;
|
return 0;
|
if (len < pos + nbytes)
|
if (len < pos + nbytes)
|
nbytes = len - pos;
|
nbytes = len - pos;
|
if (copy_to_user(buf, s + pos, nbytes))
|
if (copy_to_user(buf, s + pos, nbytes))
|
return -EFAULT;
|
return -EFAULT;
|
*ppos = pos + nbytes;
|
*ppos = pos + nbytes;
|
return nbytes;
|
return nbytes;
|
}
|
}
|
|
|
static ssize_t bm_status_write(struct file * file, const char * buffer,
|
static ssize_t bm_status_write(struct file * file, const char * buffer,
|
size_t count, loff_t *ppos)
|
size_t count, loff_t *ppos)
|
{
|
{
|
int res = parse_command(buffer, count);
|
int res = parse_command(buffer, count);
|
struct dentry *root;
|
struct dentry *root;
|
|
|
switch (res) {
|
switch (res) {
|
case 1: enabled = 0; break;
|
case 1: enabled = 0; break;
|
case 2: enabled = 1; break;
|
case 2: enabled = 1; break;
|
case 3: root = dget(file->f_vfsmnt->mnt_sb->s_root);
|
case 3: root = dget(file->f_vfsmnt->mnt_sb->s_root);
|
down(&root->d_inode->i_sem);
|
down(&root->d_inode->i_sem);
|
down(&root->d_inode->i_zombie);
|
down(&root->d_inode->i_zombie);
|
|
|
while (!list_empty(&entries))
|
while (!list_empty(&entries))
|
kill_node(list_entry(entries.next, Node, list));
|
kill_node(list_entry(entries.next, Node, list));
|
|
|
up(&root->d_inode->i_zombie);
|
up(&root->d_inode->i_zombie);
|
up(&root->d_inode->i_sem);
|
up(&root->d_inode->i_sem);
|
dput(root);
|
dput(root);
|
default: return res;
|
default: return res;
|
}
|
}
|
return count;
|
return count;
|
}
|
}
|
|
|
static struct file_operations bm_status_operations = {
|
static struct file_operations bm_status_operations = {
|
read: bm_status_read,
|
read: bm_status_read,
|
write: bm_status_write,
|
write: bm_status_write,
|
};
|
};
|
|
|
/* / */
|
/* / */
|
|
|
static struct dentry * bm_lookup(struct inode *dir, struct dentry *dentry)
|
static struct dentry * bm_lookup(struct inode *dir, struct dentry *dentry)
|
{
|
{
|
d_add(dentry, NULL);
|
d_add(dentry, NULL);
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
static struct inode_operations bm_dir_inode_operations = {
|
static struct inode_operations bm_dir_inode_operations = {
|
lookup: bm_lookup,
|
lookup: bm_lookup,
|
};
|
};
|
|
|
/* Superblock handling */
|
/* Superblock handling */
|
|
|
static int bm_statfs(struct super_block *sb, struct statfs *buf)
|
static int bm_statfs(struct super_block *sb, struct statfs *buf)
|
{
|
{
|
buf->f_type = sb->s_magic;
|
buf->f_type = sb->s_magic;
|
buf->f_bsize = PAGE_CACHE_SIZE;
|
buf->f_bsize = PAGE_CACHE_SIZE;
|
buf->f_namelen = 255;
|
buf->f_namelen = 255;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static struct super_operations s_ops = {
|
static struct super_operations s_ops = {
|
statfs: bm_statfs,
|
statfs: bm_statfs,
|
put_inode: force_delete,
|
put_inode: force_delete,
|
clear_inode: bm_clear_inode,
|
clear_inode: bm_clear_inode,
|
};
|
};
|
|
|
static struct super_block *bm_read_super(struct super_block * sb, void * data, int silent)
|
static struct super_block *bm_read_super(struct super_block * sb, void * data, int silent)
|
{
|
{
|
struct qstr names[2] = {{name:"status"}, {name:"register"}};
|
struct qstr names[2] = {{name:"status"}, {name:"register"}};
|
struct inode * inode;
|
struct inode * inode;
|
struct dentry * dentry[3];
|
struct dentry * dentry[3];
|
int i;
|
int i;
|
|
|
for (i=0; i<sizeof(names)/sizeof(names[0]); i++) {
|
for (i=0; i<sizeof(names)/sizeof(names[0]); i++) {
|
names[i].len = strlen(names[i].name);
|
names[i].len = strlen(names[i].name);
|
names[i].hash = full_name_hash(names[i].name, names[i].len);
|
names[i].hash = full_name_hash(names[i].name, names[i].len);
|
}
|
}
|
|
|
sb->s_blocksize = PAGE_CACHE_SIZE;
|
sb->s_blocksize = PAGE_CACHE_SIZE;
|
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
|
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
|
sb->s_magic = 0x42494e4d;
|
sb->s_magic = 0x42494e4d;
|
sb->s_op = &s_ops;
|
sb->s_op = &s_ops;
|
|
|
inode = bm_get_inode(sb, S_IFDIR | 0755);
|
inode = bm_get_inode(sb, S_IFDIR | 0755);
|
if (!inode)
|
if (!inode)
|
return NULL;
|
return NULL;
|
inode->i_op = &bm_dir_inode_operations;
|
inode->i_op = &bm_dir_inode_operations;
|
inode->i_fop = &dcache_dir_ops;
|
inode->i_fop = &dcache_dir_ops;
|
dentry[0] = d_alloc_root(inode);
|
dentry[0] = d_alloc_root(inode);
|
if (!dentry[0]) {
|
if (!dentry[0]) {
|
iput(inode);
|
iput(inode);
|
return NULL;
|
return NULL;
|
}
|
}
|
dentry[1] = d_alloc(dentry[0], &names[0]);
|
dentry[1] = d_alloc(dentry[0], &names[0]);
|
if (!dentry[1])
|
if (!dentry[1])
|
goto out1;
|
goto out1;
|
dentry[2] = d_alloc(dentry[0], &names[1]);
|
dentry[2] = d_alloc(dentry[0], &names[1]);
|
if (!dentry[2])
|
if (!dentry[2])
|
goto out2;
|
goto out2;
|
inode = bm_get_inode(sb, S_IFREG | 0644);
|
inode = bm_get_inode(sb, S_IFREG | 0644);
|
if (!inode)
|
if (!inode)
|
goto out3;
|
goto out3;
|
inode->i_fop = &bm_status_operations;
|
inode->i_fop = &bm_status_operations;
|
d_add(dentry[1], inode);
|
d_add(dentry[1], inode);
|
inode = bm_get_inode(sb, S_IFREG | 0400);
|
inode = bm_get_inode(sb, S_IFREG | 0400);
|
if (!inode)
|
if (!inode)
|
goto out3;
|
goto out3;
|
inode->i_fop = &bm_register_operations;
|
inode->i_fop = &bm_register_operations;
|
d_add(dentry[2], inode);
|
d_add(dentry[2], inode);
|
|
|
sb->s_root = dentry[0];
|
sb->s_root = dentry[0];
|
return sb;
|
return sb;
|
|
|
out3:
|
out3:
|
dput(dentry[2]);
|
dput(dentry[2]);
|
out2:
|
out2:
|
dput(dentry[1]);
|
dput(dentry[1]);
|
out1:
|
out1:
|
dput(dentry[0]);
|
dput(dentry[0]);
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
static struct linux_binfmt misc_format = {
|
static struct linux_binfmt misc_format = {
|
NULL, THIS_MODULE, load_misc_binary, NULL, NULL, 0
|
NULL, THIS_MODULE, load_misc_binary, NULL, NULL, 0
|
};
|
};
|
|
|
static DECLARE_FSTYPE(bm_fs_type, "binfmt_misc", bm_read_super, FS_SINGLE|FS_LITTER);
|
static DECLARE_FSTYPE(bm_fs_type, "binfmt_misc", bm_read_super, FS_SINGLE|FS_LITTER);
|
|
|
static struct vfsmount *bm_mnt;
|
static struct vfsmount *bm_mnt;
|
|
|
static int __init init_misc_binfmt(void)
|
static int __init init_misc_binfmt(void)
|
{
|
{
|
int err = register_filesystem(&bm_fs_type);
|
int err = register_filesystem(&bm_fs_type);
|
if (!err) {
|
if (!err) {
|
bm_mnt = kern_mount(&bm_fs_type);
|
bm_mnt = kern_mount(&bm_fs_type);
|
err = PTR_ERR(bm_mnt);
|
err = PTR_ERR(bm_mnt);
|
if (IS_ERR(bm_mnt))
|
if (IS_ERR(bm_mnt))
|
unregister_filesystem(&bm_fs_type);
|
unregister_filesystem(&bm_fs_type);
|
else {
|
else {
|
err = register_binfmt(&misc_format);
|
err = register_binfmt(&misc_format);
|
if (err) {
|
if (err) {
|
unregister_filesystem(&bm_fs_type);
|
unregister_filesystem(&bm_fs_type);
|
kern_umount(bm_mnt);
|
kern_umount(bm_mnt);
|
}
|
}
|
}
|
}
|
}
|
}
|
return err;
|
return err;
|
}
|
}
|
|
|
static void __exit exit_misc_binfmt(void)
|
static void __exit exit_misc_binfmt(void)
|
{
|
{
|
unregister_binfmt(&misc_format);
|
unregister_binfmt(&misc_format);
|
unregister_filesystem(&bm_fs_type);
|
unregister_filesystem(&bm_fs_type);
|
kern_umount(bm_mnt);
|
kern_umount(bm_mnt);
|
}
|
}
|
|
|
EXPORT_NO_SYMBOLS;
|
EXPORT_NO_SYMBOLS;
|
|
|
module_init(init_misc_binfmt);
|
module_init(init_misc_binfmt);
|
module_exit(exit_misc_binfmt);
|
module_exit(exit_misc_binfmt);
|
MODULE_LICENSE("GPL");
|
MODULE_LICENSE("GPL");
|
|
|
