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-rw-r--r--fs/namei.c172
1 files changed, 136 insertions, 36 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 33fb5bd34a8111..4acdac043b6bb0 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -30,6 +30,8 @@
#include <linux/audit.h>
#include <linux/capability.h>
#include <linux/file.h>
+#include <linux/fcntl.h>
+#include <linux/namei.h>
#include <asm/namei.h>
#include <asm/uaccess.h>
@@ -1063,7 +1065,8 @@ set_it:
}
/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
-int fastcall path_lookup(const char *name, unsigned int flags, struct nameidata *nd)
+static int fastcall do_path_lookup(int dfd, const char *name,
+ unsigned int flags, struct nameidata *nd)
{
int retval = 0;
@@ -1083,9 +1086,38 @@ int fastcall path_lookup(const char *name, unsigned int flags, struct nameidata
}
nd->mnt = mntget(current->fs->rootmnt);
nd->dentry = dget(current->fs->root);
- } else {
+ } else if (dfd == AT_FDCWD) {
nd->mnt = mntget(current->fs->pwdmnt);
nd->dentry = dget(current->fs->pwd);
+ } else {
+ struct file *file;
+ int fput_needed;
+ struct dentry *dentry;
+
+ file = fget_light(dfd, &fput_needed);
+ if (!file) {
+ retval = -EBADF;
+ goto out_fail;
+ }
+
+ dentry = file->f_dentry;
+
+ if (!S_ISDIR(dentry->d_inode->i_mode)) {
+ retval = -ENOTDIR;
+ fput_light(file, fput_needed);
+ goto out_fail;
+ }
+
+ retval = file_permission(file, MAY_EXEC);
+ if (retval) {
+ fput_light(file, fput_needed);
+ goto out_fail;
+ }
+
+ nd->mnt = mntget(file->f_vfsmnt);
+ nd->dentry = dget(dentry);
+
+ fput_light(file, fput_needed);
}
read_unlock(&current->fs->lock);
current->total_link_count = 0;
@@ -1094,11 +1126,19 @@ out:
if (unlikely(current->audit_context
&& nd && nd->dentry && nd->dentry->d_inode))
audit_inode(name, nd->dentry->d_inode, flags);
+out_fail:
return retval;
}
-static int __path_lookup_intent_open(const char *name, unsigned int lookup_flags,
- struct nameidata *nd, int open_flags, int create_mode)
+int fastcall path_lookup(const char *name, unsigned int flags,
+ struct nameidata *nd)
+{
+ return do_path_lookup(AT_FDCWD, name, flags, nd);
+}
+
+static int __path_lookup_intent_open(int dfd, const char *name,
+ unsigned int lookup_flags, struct nameidata *nd,
+ int open_flags, int create_mode)
{
struct file *filp = get_empty_filp();
int err;
@@ -1108,7 +1148,7 @@ static int __path_lookup_intent_open(const char *name, unsigned int lookup_flags
nd->intent.open.file = filp;
nd->intent.open.flags = open_flags;
nd->intent.open.create_mode = create_mode;
- err = path_lookup(name, lookup_flags|LOOKUP_OPEN, nd);
+ err = do_path_lookup(dfd, name, lookup_flags|LOOKUP_OPEN, nd);
if (IS_ERR(nd->intent.open.file)) {
if (err == 0) {
err = PTR_ERR(nd->intent.open.file);
@@ -1126,10 +1166,10 @@ static int __path_lookup_intent_open(const char *name, unsigned int lookup_flags
* @nd: pointer to nameidata
* @open_flags: open intent flags
*/
-int path_lookup_open(const char *name, unsigned int lookup_flags,
+int path_lookup_open(int dfd, const char *name, unsigned int lookup_flags,
struct nameidata *nd, int open_flags)
{
- return __path_lookup_intent_open(name, lookup_flags, nd,
+ return __path_lookup_intent_open(dfd, name, lookup_flags, nd,
open_flags, 0);
}
@@ -1141,12 +1181,12 @@ int path_lookup_open(const char *name, unsigned int lookup_flags,
* @open_flags: open intent flags
* @create_mode: create intent flags
*/
-static int path_lookup_create(const char *name, unsigned int lookup_flags,
- struct nameidata *nd, int open_flags,
- int create_mode)
+static int path_lookup_create(int dfd, const char *name,
+ unsigned int lookup_flags, struct nameidata *nd,
+ int open_flags, int create_mode)
{
- return __path_lookup_intent_open(name, lookup_flags|LOOKUP_CREATE, nd,
- open_flags, create_mode);
+ return __path_lookup_intent_open(dfd, name, lookup_flags|LOOKUP_CREATE,
+ nd, open_flags, create_mode);
}
int __user_path_lookup_open(const char __user *name, unsigned int lookup_flags,
@@ -1156,7 +1196,7 @@ int __user_path_lookup_open(const char __user *name, unsigned int lookup_flags,
int err = PTR_ERR(tmp);
if (!IS_ERR(tmp)) {
- err = __path_lookup_intent_open(tmp, lookup_flags, nd, open_flags, 0);
+ err = __path_lookup_intent_open(AT_FDCWD, tmp, lookup_flags, nd, open_flags, 0);
putname(tmp);
}
return err;
@@ -1248,18 +1288,24 @@ access:
* that namei follows links, while lnamei does not.
* SMP-safe
*/
-int fastcall __user_walk(const char __user *name, unsigned flags, struct nameidata *nd)
+int fastcall __user_walk_fd(int dfd, const char __user *name, unsigned flags,
+ struct nameidata *nd)
{
char *tmp = getname(name);
int err = PTR_ERR(tmp);
if (!IS_ERR(tmp)) {
- err = path_lookup(tmp, flags, nd);
+ err = do_path_lookup(dfd, tmp, flags, nd);
putname(tmp);
}
return err;
}
+int fastcall __user_walk(const char __user *name, unsigned flags, struct nameidata *nd)
+{
+ return __user_walk_fd(AT_FDCWD, name, flags, nd);
+}
+
/*
* It's inline, so penalty for filesystems that don't use sticky bit is
* minimal.
@@ -1518,7 +1564,8 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
* for symlinks (where the permissions are checked later).
* SMP-safe
*/
-int open_namei(const char * pathname, int flag, int mode, struct nameidata *nd)
+int open_namei(int dfd, const char *pathname, int flag,
+ int mode, struct nameidata *nd)
{
int acc_mode, error;
struct path path;
@@ -1540,7 +1587,8 @@ int open_namei(const char * pathname, int flag, int mode, struct nameidata *nd)
* The simplest case - just a plain lookup.
*/
if (!(flag & O_CREAT)) {
- error = path_lookup_open(pathname, lookup_flags(flag), nd, flag);
+ error = path_lookup_open(dfd, pathname, lookup_flags(flag),
+ nd, flag);
if (error)
return error;
goto ok;
@@ -1549,7 +1597,7 @@ int open_namei(const char * pathname, int flag, int mode, struct nameidata *nd)
/*
* Create - we need to know the parent.
*/
- error = path_lookup_create(pathname, LOOKUP_PARENT, nd, flag, mode);
+ error = path_lookup_create(dfd,pathname,LOOKUP_PARENT,nd,flag,mode);
if (error)
return error;
@@ -1744,7 +1792,8 @@ int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
return error;
}
-asmlinkage long sys_mknod(const char __user * filename, int mode, unsigned dev)
+asmlinkage long sys_mknodat(int dfd, const char __user *filename, int mode,
+ unsigned dev)
{
int error = 0;
char * tmp;
@@ -1757,7 +1806,7 @@ asmlinkage long sys_mknod(const char __user * filename, int mode, unsigned dev)
if (IS_ERR(tmp))
return PTR_ERR(tmp);
- error = path_lookup(tmp, LOOKUP_PARENT, &nd);
+ error = do_path_lookup(dfd, tmp, LOOKUP_PARENT, &nd);
if (error)
goto out;
dentry = lookup_create(&nd, 0);
@@ -1793,6 +1842,11 @@ out:
return error;
}
+asmlinkage long sys_mknod(const char __user *filename, int mode, unsigned dev)
+{
+ return sys_mknodat(AT_FDCWD, filename, mode, dev);
+}
+
int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
int error = may_create(dir, dentry, NULL);
@@ -1815,7 +1869,7 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
return error;
}
-asmlinkage long sys_mkdir(const char __user * pathname, int mode)
+asmlinkage long sys_mkdirat(int dfd, const char __user *pathname, int mode)
{
int error = 0;
char * tmp;
@@ -1826,7 +1880,7 @@ asmlinkage long sys_mkdir(const char __user * pathname, int mode)
struct dentry *dentry;
struct nameidata nd;
- error = path_lookup(tmp, LOOKUP_PARENT, &nd);
+ error = do_path_lookup(dfd, tmp, LOOKUP_PARENT, &nd);
if (error)
goto out;
dentry = lookup_create(&nd, 1);
@@ -1846,6 +1900,11 @@ out:
return error;
}
+asmlinkage long sys_mkdir(const char __user *pathname, int mode)
+{
+ return sys_mkdirat(AT_FDCWD, pathname, mode);
+}
+
/*
* We try to drop the dentry early: we should have
* a usage count of 2 if we're the only user of this
@@ -1907,7 +1966,7 @@ int vfs_rmdir(struct inode *dir, struct dentry *dentry)
return error;
}
-asmlinkage long sys_rmdir(const char __user * pathname)
+static long do_rmdir(int dfd, const char __user *pathname)
{
int error = 0;
char * name;
@@ -1918,7 +1977,7 @@ asmlinkage long sys_rmdir(const char __user * pathname)
if(IS_ERR(name))
return PTR_ERR(name);
- error = path_lookup(name, LOOKUP_PARENT, &nd);
+ error = do_path_lookup(dfd, name, LOOKUP_PARENT, &nd);
if (error)
goto exit;
@@ -1948,6 +2007,11 @@ exit:
return error;
}
+asmlinkage long sys_rmdir(const char __user *pathname)
+{
+ return do_rmdir(AT_FDCWD, pathname);
+}
+
int vfs_unlink(struct inode *dir, struct dentry *dentry)
{
int error = may_delete(dir, dentry, 0);
@@ -1984,7 +2048,7 @@ int vfs_unlink(struct inode *dir, struct dentry *dentry)
* writeout happening, and we don't want to prevent access to the directory
* while waiting on the I/O.
*/
-asmlinkage long sys_unlink(const char __user * pathname)
+static long do_unlinkat(int dfd, const char __user *pathname)
{
int error = 0;
char * name;
@@ -1996,7 +2060,7 @@ asmlinkage long sys_unlink(const char __user * pathname)
if(IS_ERR(name))
return PTR_ERR(name);
- error = path_lookup(name, LOOKUP_PARENT, &nd);
+ error = do_path_lookup(dfd, name, LOOKUP_PARENT, &nd);
if (error)
goto exit;
error = -EISDIR;
@@ -2031,6 +2095,22 @@ slashes:
goto exit2;
}
+asmlinkage long sys_unlinkat(int dfd, const char __user *pathname, int flag)
+{
+ if ((flag & ~AT_REMOVEDIR) != 0)
+ return -EINVAL;
+
+ if (flag & AT_REMOVEDIR)
+ return do_rmdir(dfd, pathname);
+
+ return do_unlinkat(dfd, pathname);
+}
+
+asmlinkage long sys_unlink(const char __user *pathname)
+{
+ return do_unlinkat(AT_FDCWD, pathname);
+}
+
int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname, int mode)
{
int error = may_create(dir, dentry, NULL);
@@ -2052,7 +2132,8 @@ int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname, i
return error;
}
-asmlinkage long sys_symlink(const char __user * oldname, const char __user * newname)
+asmlinkage long sys_symlinkat(const char __user *oldname,
+ int newdfd, const char __user *newname)
{
int error = 0;
char * from;
@@ -2067,7 +2148,7 @@ asmlinkage long sys_symlink(const char __user * oldname, const char __user * new
struct dentry *dentry;
struct nameidata nd;
- error = path_lookup(to, LOOKUP_PARENT, &nd);
+ error = do_path_lookup(newdfd, to, LOOKUP_PARENT, &nd);
if (error)
goto out;
dentry = lookup_create(&nd, 0);
@@ -2085,6 +2166,11 @@ out:
return error;
}
+asmlinkage long sys_symlink(const char __user *oldname, const char __user *newname)
+{
+ return sys_symlinkat(oldname, AT_FDCWD, newname);
+}
+
int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
{
struct inode *inode = old_dentry->d_inode;
@@ -2132,7 +2218,8 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
* with linux 2.0, and to avoid hard-linking to directories
* and other special files. --ADM
*/
-asmlinkage long sys_link(const char __user * oldname, const char __user * newname)
+asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
+ int newdfd, const char __user *newname)
{
struct dentry *new_dentry;
struct nameidata nd, old_nd;
@@ -2143,10 +2230,10 @@ asmlinkage long sys_link(const char __user * oldname, const char __user * newnam
if (IS_ERR(to))
return PTR_ERR(to);
- error = __user_walk(oldname, 0, &old_nd);
+ error = __user_walk_fd(olddfd, oldname, 0, &old_nd);
if (error)
goto exit;
- error = path_lookup(to, LOOKUP_PARENT, &nd);
+ error = do_path_lookup(newdfd, to, LOOKUP_PARENT, &nd);
if (error)
goto out;
error = -EXDEV;
@@ -2169,6 +2256,11 @@ exit:
return error;
}
+asmlinkage long sys_link(const char __user *oldname, const char __user *newname)
+{
+ return sys_linkat(AT_FDCWD, oldname, AT_FDCWD, newname);
+}
+
/*
* The worst of all namespace operations - renaming directory. "Perverted"
* doesn't even start to describe it. Somebody in UCB had a heck of a trip...
@@ -2315,7 +2407,8 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
return error;
}
-static int do_rename(const char * oldname, const char * newname)
+static int do_rename(int olddfd, const char *oldname,
+ int newdfd, const char *newname)
{
int error = 0;
struct dentry * old_dir, * new_dir;
@@ -2323,11 +2416,11 @@ static int do_rename(const char * oldname, const char * newname)
struct dentry * trap;
struct nameidata oldnd, newnd;
- error = path_lookup(oldname, LOOKUP_PARENT, &oldnd);
+ error = do_path_lookup(olddfd, oldname, LOOKUP_PARENT, &oldnd);
if (error)
goto exit;
- error = path_lookup(newname, LOOKUP_PARENT, &newnd);
+ error = do_path_lookup(newdfd, newname, LOOKUP_PARENT, &newnd);
if (error)
goto exit1;
@@ -2391,7 +2484,8 @@ exit:
return error;
}
-asmlinkage long sys_rename(const char __user * oldname, const char __user * newname)
+asmlinkage long sys_renameat(int olddfd, const char __user *oldname,
+ int newdfd, const char __user *newname)
{
int error;
char * from;
@@ -2403,13 +2497,18 @@ asmlinkage long sys_rename(const char __user * oldname, const char __user * newn
to = getname(newname);
error = PTR_ERR(to);
if (!IS_ERR(to)) {
- error = do_rename(from,to);
+ error = do_rename(olddfd, from, newdfd, to);
putname(to);
}
putname(from);
return error;
}
+asmlinkage long sys_rename(const char __user *oldname, const char __user *newname)
+{
+ return sys_renameat(AT_FDCWD, oldname, AT_FDCWD, newname);
+}
+
int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen, const char *link)
{
int len;
@@ -2553,6 +2652,7 @@ struct inode_operations page_symlink_inode_operations = {
};
EXPORT_SYMBOL(__user_walk);
+EXPORT_SYMBOL(__user_walk_fd);
EXPORT_SYMBOL(follow_down);
EXPORT_SYMBOL(follow_up);
EXPORT_SYMBOL(get_write_access); /* binfmt_aout */
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-03 09:41:55 +0000