From 74d016ecc1a7974664e98d1afbf649cd4e0e0423 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 15 Nov 2023 22:41:27 -0500 Subject: new helper: user_path_locked_at() Equivalent of kern_path_locked() taking dfd/userland name. User introduced in the next commit. Signed-off-by: Al Viro --- fs/namei.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) (limited to 'fs/namei.c') diff --git a/fs/namei.c b/fs/namei.c index 71c13b2990b4..3ffbe268d52c 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2573,13 +2573,13 @@ static int filename_parentat(int dfd, struct filename *name, } /* does lookup, returns the object with parent locked */ -static struct dentry *__kern_path_locked(struct filename *name, struct path *path) +static struct dentry *__kern_path_locked(int dfd, struct filename *name, struct path *path) { struct dentry *d; struct qstr last; int type, error; - error = filename_parentat(AT_FDCWD, name, 0, path, &last, &type); + error = filename_parentat(dfd, name, 0, path, &last, &type); if (error) return ERR_PTR(error); if (unlikely(type != LAST_NORM)) { @@ -2598,12 +2598,22 @@ static struct dentry *__kern_path_locked(struct filename *name, struct path *pat struct dentry *kern_path_locked(const char *name, struct path *path) { struct filename *filename = getname_kernel(name); - struct dentry *res = __kern_path_locked(filename, path); + struct dentry *res = __kern_path_locked(AT_FDCWD, filename, path); putname(filename); return res; } +struct dentry *user_path_locked_at(int dfd, const char __user *name, struct path *path) +{ + struct filename *filename = getname(name); + struct dentry *res = __kern_path_locked(dfd, filename, path); + + putname(filename); + return res; +} +EXPORT_SYMBOL(user_path_locked_at); + int kern_path(const char *name, unsigned int flags, struct path *path) { struct filename *filename = getname_kernel(name); -- cgit