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Commit ba6bed10 authored by Al Viro's avatar Al Viro Committed by TARKZiM
Browse files

allow build_open_flags() to return an error 



Change-Id: I6e900fc3facf5a3febefe138fea7db493bc383d8
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent ec26fc60

fs/exec.c

+6 −4
Original line number Diff line number Diff line
@@ -110,13 +110,14 @@ SYSCALL_DEFINE1(uselib, const char __user *, library) 
	static const struct open_flags uselib_flags = {

		.open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC,

		.acc_mode = MAY_READ | MAY_EXEC | MAY_OPEN,

		.intent = LOOKUP_OPEN

		.intent = LOOKUP_OPEN,

		.lookup_flags = LOOKUP_FOLLOW,

	};



	if (IS_ERR(tmp))

		goto out;



	file = do_filp_open(AT_FDCWD, tmp, &uselib_flags, LOOKUP_FOLLOW);

	file = do_filp_open(AT_FDCWD, tmp, &uselib_flags);

	putname(tmp);

	error = PTR_ERR(file);

	if (IS_ERR(file))
@@ -776,10 +777,11 @@ struct file *open_exec(const char *name) 
	static const struct open_flags open_exec_flags = {

		.open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC,

		.acc_mode = MAY_EXEC | MAY_OPEN,

		.intent = LOOKUP_OPEN

		.intent = LOOKUP_OPEN,

		.lookup_flags = LOOKUP_FOLLOW,

	};



	file = do_filp_open(AT_FDCWD, &tmp, &open_exec_flags, LOOKUP_FOLLOW);

	file = do_filp_open(AT_FDCWD, &tmp, &open_exec_flags);

	if (IS_ERR(file))

		goto out;

fs/internal.h

+3 −2
Original line number Diff line number Diff line
@@ -95,11 +95,12 @@ struct open_flags { 
	umode_t mode;

	int acc_mode;

	int intent;

	int lookup_flags;

};

extern struct file *do_filp_open(int dfd, struct filename *pathname,

		const struct open_flags *op, int flags);

		const struct open_flags *op);

extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,

		const char *, const struct open_flags *, int lookup_flags);

		const char *, const struct open_flags *);



extern long do_handle_open(int mountdirfd,

			   struct file_handle __user *ufh, int open_flag);

fs/namei.c

+4 −4
Original line number Diff line number Diff line
@@ -3023,9 +3023,10 @@ out: 
}



struct file *do_filp_open(int dfd, struct filename *pathname,

		const struct open_flags *op, int flags)

		const struct open_flags *op)

{

	struct nameidata nd;

	int flags = op->lookup_flags;

	struct file *filp;



	filp = path_openat(dfd, pathname, &nd, op, flags | LOOKUP_RCU);
@@ -3037,17 +3038,16 @@ struct file *do_filp_open(int dfd, struct filename *pathname, 
}



struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,

		const char *name, const struct open_flags *op, int flags)

		const char *name, const struct open_flags *op)

{

	struct nameidata nd;

	struct file *file;

	struct filename filename = { .name = name };

	int flags = op->lookup_flags | LOOKUP_ROOT;



	nd.root.mnt = mnt;

	nd.root.dentry = dentry;



	flags |= LOOKUP_ROOT;



	if (dentry->d_inode->i_op->follow_link && op->intent & LOOKUP_OPEN)

		return ERR_PTR(-ELOOP);

fs/open.c

+27 −21
Original line number Diff line number Diff line
@@ -879,7 +879,8 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o 
		lookup_flags |= LOOKUP_DIRECTORY;

	if (!(flags & O_NOFOLLOW))

		lookup_flags |= LOOKUP_FOLLOW;

	return lookup_flags;

	op->lookup_flags = lookup_flags;

	return 0;

}



/**
@@ -896,8 +897,8 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o 
struct file *file_open_name(struct filename *name, int flags, umode_t mode)

{

	struct open_flags op;

	int lookup = build_open_flags(flags, mode, &op);

	return do_filp_open(AT_FDCWD, name, &op, lookup);

	int err = build_open_flags(flags, mode, &op);

	return err ? ERR_PTR(err) : do_filp_open(AT_FDCWD, name, &op);

}



/**
@@ -922,27 +923,34 @@ struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt, 
			    const char *filename, int flags)

{

	struct open_flags op;

	int lookup = build_open_flags(flags, 0, &op);

	int err = build_open_flags(flags, 0, &op);

	if (err)

		return ERR_PTR(err);

	if (flags & O_CREAT)

		return ERR_PTR(-EINVAL);

	if (!filename && (flags & O_DIRECTORY))

		if (!dentry->d_inode->i_op->lookup)

			return ERR_PTR(-ENOTDIR);

	return do_file_open_root(dentry, mnt, filename, &op, lookup);

	return do_file_open_root(dentry, mnt, filename, &op);

}

EXPORT_SYMBOL(file_open_root);



long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode)

{

	struct open_flags op;

	int lookup = build_open_flags(flags, mode, &op);

	struct filename *tmp = getname(filename);

	int fd = PTR_ERR(tmp);

	int fd = build_open_flags(flags, mode, &op);

	struct filename *tmp;



	if (fd)

		return fd;



	tmp = getname(filename);

	if (IS_ERR(tmp))

		return PTR_ERR(tmp);



	if (!IS_ERR(tmp)) {

	fd = get_unused_fd_flags(flags);

	if (fd >= 0) {

			struct file *f = do_filp_open(dfd, tmp, &op, lookup);

		struct file *f = do_filp_open(dfd, tmp, &op);

		if (IS_ERR(f)) {

			put_unused_fd(fd);

			fd = PTR_ERR(f);
@@ -951,8 +959,6 @@ long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode) 
			fd_install(fd, f);

		}

	}

		putname(tmp);

	}

	return fd;

}