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Switch open_exec() and sys_uselib() to do_open_filp()

Browse Source 
... and make path_lookup_open() static

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-04-06 11:16:22 -04:00
parent a44ddbb6d8
commit 6e8341a11e
5 changed files with 36 additions and 58 deletions
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76
fs/exec.c
View File

@ -105,36 +105,28 @@ static inline void put_binfmt(struct linux_binfmt * fmt)
SYSCALL_DEFINE1(uselib, const char __user *, library)
{
struct file *file;
struct nameidata nd;
char *tmp = getname(library);
int error = PTR_ERR(tmp);
if (!IS_ERR(tmp)) {
error = path_lookup_open(AT_FDCWD, tmp,
LOOKUP_FOLLOW, &nd,
FMODE_READ|FMODE_EXEC);
putname(tmp);
}
if (error)
if (IS_ERR(tmp))
goto out;
error = -EINVAL;
if (!S_ISREG(nd.path.dentry->d_inode->i_mode))
goto exit;
error = -EACCES;
if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
goto exit;
error = may_open(&nd.path, MAY_READ | MAY_EXEC | MAY_OPEN, 0);
if (error)
goto exit;
file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE);
file = do_filp_open(AT_FDCWD, tmp,
O_LARGEFILE | O_RDONLY | FMODE_EXEC, 0,
MAY_READ | MAY_EXEC | MAY_OPEN);
putname(tmp);
error = PTR_ERR(file);
if (IS_ERR(file))
goto out;
error = -EINVAL;
if (!S_ISREG(file->f_path.dentry->d_inode->i_mode))
goto exit;
error = -EACCES;
if (file->f_path.mnt->mnt_flags & MNT_NOEXEC)
goto exit;
fsnotify_open(file->f_path.dentry);
error = -ENOEXEC;
@ -156,13 +148,10 @@ SYSCALL_DEFINE1(uselib, const char __user *, library)
}
read_unlock(&binfmt_lock);
}
exit:
fput(file);
out:
return error;
exit:
release_open_intent(&nd);
path_put(&nd.path);
goto out;
}
#ifdef CONFIG_MMU
@ -657,44 +646,33 @@ EXPORT_SYMBOL(setup_arg_pages);
struct file *open_exec(const char *name)
{
struct nameidata nd;
struct file *file;
int err;
err = path_lookup_open(AT_FDCWD, name, LOOKUP_FOLLOW, &nd,
FMODE_READ|FMODE_EXEC);
if (err)
file = do_filp_open(AT_FDCWD, name,
O_LARGEFILE | O_RDONLY | FMODE_EXEC, 0,
MAY_EXEC | MAY_OPEN);
if (IS_ERR(file))
goto out;
err = -EACCES;
if (!S_ISREG(nd.path.dentry->d_inode->i_mode))
goto out_path_put;
if (!S_ISREG(file->f_path.dentry->d_inode->i_mode))
goto exit;
if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
goto out_path_put;
err = may_open(&nd.path, MAY_EXEC | MAY_OPEN, 0);
if (err)
goto out_path_put;
file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE);
if (IS_ERR(file))
return file;
if (file->f_path.mnt->mnt_flags & MNT_NOEXEC)
goto exit;
fsnotify_open(file->f_path.dentry);
err = deny_write_access(file);
if (err) {
fput(file);
goto out;
}
if (err)
goto exit;
out:
return file;
out_path_put:
release_open_intent(&nd);
path_put(&nd.path);
out:
exit:
fput(file);
return ERR_PTR(err);
}
EXPORT_SYMBOL(open_exec);

13
fs/namei.c
View File

@ -1130,8 +1130,8 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
* @nd: pointer to nameidata
* @open_flags: open intent flags
*/
int path_lookup_open(int dfd, const char *name, unsigned int lookup_flags,
struct nameidata *nd, int open_flags)
static int path_lookup_open(int dfd, const char *name,
unsigned int lookup_flags, struct nameidata *nd, int open_flags)
{
struct file *filp = get_empty_filp();
int err;
@ -1637,18 +1637,19 @@ static int open_will_write_to_fs(int flag, struct inode *inode)
* open_to_namei_flags() for more details.
*/
struct file *do_filp_open(int dfd, const char *pathname,
int open_flag, int mode)
int open_flag, int mode, int acc_mode)
{
struct file *filp;
struct nameidata nd;
int acc_mode, error;
int error;
struct path path;
struct dentry *dir;
int count = 0;
int will_write;
int flag = open_to_namei_flags(open_flag);
acc_mode = MAY_OPEN | ACC_MODE(flag);
if (!acc_mode)
acc_mode = MAY_OPEN | ACC_MODE(flag);
/* O_TRUNC implies we need access checks for write permissions */
if (flag & O_TRUNC)
@ -1869,7 +1870,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
*/
struct file *filp_open(const char *filename, int flags, int mode)
{
return do_filp_open(AT_FDCWD, filename, flags, mode);
return do_filp_open(AT_FDCWD, filename, flags, mode, 0);
}
EXPORT_SYMBOL(filp_open);

2
fs/open.c
View File

@ -1033,7 +1033,7 @@ long do_sys_open(int dfd, const char __user *filename, int flags, int mode)
if (!IS_ERR(tmp)) {
fd = get_unused_fd_flags(flags);
if (fd >= 0) {
struct file *f = do_filp_open(dfd, tmp, flags, mode);
struct file *f = do_filp_open(dfd, tmp, flags, mode, 0);
if (IS_ERR(f)) {
put_unused_fd(fd);
fd = PTR_ERR(f);

2
include/linux/fs.h
View File

@ -2118,7 +2118,7 @@ extern struct file *create_write_pipe(int flags);
extern void free_write_pipe(struct file *);
extern struct file *do_filp_open(int dfd, const char *pathname,
int open_flag, int mode);
int open_flag, int mode, int acc_mode);
extern int may_open(struct path *, int, int);
extern int kernel_read(struct file *, unsigned long, char *, unsigned long);

1
include/linux/namei.h
View File

@ -69,7 +69,6 @@ extern int path_lookup(const char *, unsigned, struct nameidata *);
extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
const char *, unsigned int, struct nameidata *);
extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);
extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
int (*open)(struct inode *, struct file *));
extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);