[PATCH v6 4/9] fs: make do_symlinkat() take struct filename
From: Dmitry Kadashev <hidden>
Date: 2021-06-24 11:15:18
Also in:
linux-fsdevel
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
Pass in the struct filename pointers instead of the user string, for uniformity with the recently converted do_mkdnodat(), do_unlinkat(), do_renameat(), do_mkdirat(). Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <redacted> Link: https://lore.kernel.org/io-uring/20210330071700.kpjoyp5zlni7uejm@wittgenstein/ (local) Signed-off-by: Dmitry Kadashev <redacted> Acked-by: Christian Brauner <redacted> --- fs/namei.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 9fc981e28788..76572d703e82 100644
--- a/fs/namei.c
+++ b/fs/namei.c@@ -4189,23 +4189,23 @@ int vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, } EXPORT_SYMBOL(vfs_symlink); -static long do_symlinkat(const char __user *oldname, int newdfd, - const char __user *newname) +static long do_symlinkat(struct filename *from, int newdfd, + struct filename *to) { int error; - struct filename *from; struct dentry *dentry; struct path path; unsigned int lookup_flags = 0; - from = getname(oldname); - if (IS_ERR(from)) - return PTR_ERR(from); + if (IS_ERR(from)) { + error = PTR_ERR(from); + goto out_putboth; + } retry: - dentry = user_path_create(newdfd, newname, &path, lookup_flags); + dentry = __filename_create(newdfd, to, &path, lookup_flags); error = PTR_ERR(dentry); if (IS_ERR(dentry)) - goto out_putname; + goto out_putfrom; error = security_path_symlink(&path, dentry, from->name); if (!error) {
@@ -4220,20 +4220,24 @@ static long do_symlinkat(const char __user *oldname, int newdfd, lookup_flags |= LOOKUP_REVAL; goto retry; } -out_putname: - putname(from); +out_putboth: + if (!IS_ERR(to)) + putname(to); +out_putfrom: + if (!IS_ERR(from)) + putname(from); return error; } SYSCALL_DEFINE3(symlinkat, const char __user *, oldname, int, newdfd, const char __user *, newname) { - return do_symlinkat(oldname, newdfd, newname); + return do_symlinkat(getname(oldname), newdfd, getname(newname)); } SYSCALL_DEFINE2(symlink, const char __user *, oldname, const char __user *, newname) { - return do_symlinkat(oldname, AT_FDCWD, newname); + return do_symlinkat(getname(oldname), AT_FDCWD, getname(newname)); } /**
--
2.30.2