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-rw-r--r--fs/exec.c4
-rw-r--r--fs/inotify.c2
-rw-r--r--fs/namei.c23
-rw-r--r--fs/namespace.c2
-rw-r--r--fs/open.c12
-rw-r--r--include/linux/fs.h1
-rw-r--r--net/unix/af_unix.c2
7 files changed, 31 insertions, 15 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 5a4e3acc2e9..7bbb781b9ac 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -135,7 +135,7 @@ asmlinkage long sys_uselib(const char __user * library)
if (!S_ISREG(nd.dentry->d_inode->i_mode))
goto exit;
- error = permission(nd.dentry->d_inode, MAY_READ | MAY_EXEC, &nd);
+ error = vfs_permission(&nd, MAY_READ | MAY_EXEC);
if (error)
goto exit;
@@ -495,7 +495,7 @@ struct file *open_exec(const char *name)
file = ERR_PTR(-EACCES);
if (!(nd.mnt->mnt_flags & MNT_NOEXEC) &&
S_ISREG(inode->i_mode)) {
- int err = permission(inode, MAY_EXEC, &nd);
+ int err = vfs_permission(&nd, MAY_EXEC);
if (!err && !(inode->i_mode & 0111))
err = -EACCES;
file = ERR_PTR(err);
diff --git a/fs/inotify.c b/fs/inotify.c
index 9fbaebfdf40..bf7ce1d2412 100644
--- a/fs/inotify.c
+++ b/fs/inotify.c
@@ -372,7 +372,7 @@ static int find_inode(const char __user *dirname, struct nameidata *nd)
if (error)
return error;
/* you can only watch an inode if you have read permissions on it */
- error = permission(nd->dentry->d_inode, MAY_READ, NULL);
+ error = vfs_permission(nd, MAY_READ);
if (error)
path_release(nd);
return error;
diff --git a/fs/namei.c b/fs/namei.c
index b3f8a1966c9..25e4ab4ce8b 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -256,6 +256,21 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
return security_inode_permission(inode, mask, nd);
}
+/**
+ * vfs_permission - check for access rights to a given path
+ * @nd: lookup result that describes the path
+ * @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC)
+ *
+ * Used to check for read/write/execute permissions on a path.
+ * We use "fsuid" for this, letting us set arbitrary permissions
+ * for filesystem access without changing the "normal" uids which
+ * are used for other things.
+ */
+int vfs_permission(struct nameidata *nd, int mask)
+{
+ return permission(nd->dentry->d_inode, mask, nd);
+}
+
/*
* get_write_access() gets write permission for a file.
* put_write_access() releases this write permission.
@@ -765,9 +780,8 @@ static fastcall int __link_path_walk(const char * name, struct nameidata *nd)
nd->flags |= LOOKUP_CONTINUE;
err = exec_permission_lite(inode, nd);
- if (err == -EAGAIN) {
- err = permission(inode, MAY_EXEC, nd);
- }
+ if (err == -EAGAIN)
+ err = vfs_permission(nd, MAY_EXEC);
if (err)
break;
@@ -1407,7 +1421,7 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
if (S_ISDIR(inode->i_mode) && (flag & FMODE_WRITE))
return -EISDIR;
- error = permission(inode, acc_mode, nd);
+ error = vfs_permission(nd, acc_mode);
if (error)
return error;
@@ -2536,6 +2550,7 @@ EXPORT_SYMBOL(path_lookup);
EXPORT_SYMBOL(path_release);
EXPORT_SYMBOL(path_walk);
EXPORT_SYMBOL(permission);
+EXPORT_SYMBOL(vfs_permission);
EXPORT_SYMBOL(unlock_rename);
EXPORT_SYMBOL(vfs_create);
EXPORT_SYMBOL(vfs_follow_link);
diff --git a/fs/namespace.c b/fs/namespace.c
index caa9187f67e..2019899f2ab 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -637,7 +637,7 @@ static int mount_is_safe(struct nameidata *nd)
if (current->uid != nd->dentry->d_inode->i_uid)
return -EPERM;
}
- if (permission(nd->dentry->d_inode, MAY_WRITE, nd))
+ if (vfs_permission(nd, MAY_WRITE))
return -EPERM;
return 0;
#endif
diff --git a/fs/open.c b/fs/open.c
index 6e8136751e9..baffc084580 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -240,7 +240,7 @@ static inline long do_sys_truncate(const char __user * path, loff_t length)
if (!S_ISREG(inode->i_mode))
goto dput_and_out;
- error = permission(inode,MAY_WRITE,&nd);
+ error = vfs_permission(&nd, MAY_WRITE);
if (error)
goto dput_and_out;
@@ -394,7 +394,7 @@ asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times)
goto dput_and_out;
if (current->fsuid != inode->i_uid &&
- (error = permission(inode,MAY_WRITE,&nd)) != 0)
+ (error = vfs_permission(&nd, MAY_WRITE)) != 0)
goto dput_and_out;
}
down(&inode->i_sem);
@@ -447,7 +447,7 @@ long do_utimes(char __user * filename, struct timeval * times)
goto dput_and_out;
if (current->fsuid != inode->i_uid &&
- (error = permission(inode,MAY_WRITE,&nd)) != 0)
+ (error = vfs_permission(&nd, MAY_WRITE)) != 0)
goto dput_and_out;
}
down(&inode->i_sem);
@@ -506,7 +506,7 @@ asmlinkage long sys_access(const char __user * filename, int mode)
res = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_ACCESS, &nd);
if (!res) {
- res = permission(nd.dentry->d_inode, mode, &nd);
+ res = vfs_permission(&nd, mode);
/* SuS v2 requires we report a read only fs too */
if(!res && (mode & S_IWOTH) && IS_RDONLY(nd.dentry->d_inode)
&& !special_file(nd.dentry->d_inode->i_mode))
@@ -530,7 +530,7 @@ asmlinkage long sys_chdir(const char __user * filename)
if (error)
goto out;
- error = permission(nd.dentry->d_inode,MAY_EXEC,&nd);
+ error = vfs_permission(&nd, MAY_EXEC);
if (error)
goto dput_and_out;
@@ -581,7 +581,7 @@ asmlinkage long sys_chroot(const char __user * filename)
if (error)
goto out;
- error = permission(nd.dentry->d_inode,MAY_EXEC,&nd);
+ error = vfs_permission(&nd, MAY_EXEC);
if (error)
goto dput_and_out;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1b5f502a4b8..c3b8c1dc7cd 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -874,6 +874,7 @@ static inline void unlock_super(struct super_block * sb)
/*
* VFS helper functions..
*/
+extern int vfs_permission(struct nameidata *, int);
extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
extern int vfs_mkdir(struct inode *, struct dentry *, int);
extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 41feca3bef8..acc73ba8bad 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -676,7 +676,7 @@ static struct sock *unix_find_other(struct sockaddr_un *sunname, int len,
err = path_lookup(sunname->sun_path, LOOKUP_FOLLOW, &nd);
if (err)
goto fail;
- err = permission(nd.dentry->d_inode,MAY_WRITE, &nd);
+ err = vfs_permission(&nd, MAY_WRITE);
if (err)
goto put_fail;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 13:28:51 +0000