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Message-ID: <20240502103716.avdfm6r3ma2wfxjj@quack3>
Date: Thu, 2 May 2024 12:37:16 +0200
From: Jan Kara <jack@...e.cz>
To: cgzones@...glemail.com
Cc: brauner@...nel.org, Jan Kara <jack@...e.com>,
Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
Arnd Bergmann <arnd@...db.de>, Thomas Gleixner <tglx@...utronix.de>,
Kees Cook <keescook@...omium.org>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Casey Schaufler <casey@...aufler-ca.com>,
"peterz@...radead.org" <peterz@...radead.org>,
Sohil Mehta <sohil.mehta@...el.com>,
Miklos Szeredi <mszeredi@...hat.com>,
Mark Rutland <mark.rutland@....com>, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH] fs/xattr: unify *at syscalls
On Tue 30-04-24 17:19:14, Christian Göttsche wrote:
> From: Christian Göttsche <cgzones@...glemail.com>
>
> Use the same parameter ordering for all four newly added *xattrat
> syscalls:
>
> dirfd, pathname, at_flags, ...
>
> Also consistently use unsigned int as the type for at_flags.
>
> Suggested-by: Jan Kara <jack@...e.com>
> Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
Thanks! The change looks good to me. Christian, do you plan to fold this
into the series you've taken to your tree?
Honza
> ---
> fs/xattr.c | 36 +++++++++++++++++++-----------------
> include/linux/syscalls.h | 8 +++++---
> 2 files changed, 24 insertions(+), 20 deletions(-)
>
> diff --git a/fs/xattr.c b/fs/xattr.c
> index 45603e74c632..454304046d7d 100644
> --- a/fs/xattr.c
> +++ b/fs/xattr.c
> @@ -931,17 +931,18 @@ listxattr(struct dentry *d, char __user *list, size_t size)
> return error;
> }
>
> -static ssize_t do_listxattrat(int dfd, const char __user *pathname, char __user *list,
> - size_t size, int flags)
> +static ssize_t do_listxattrat(int dfd, const char __user *pathname,
> + unsigned int at_flags,
> + char __user *list, size_t size)
> {
> struct path path;
> ssize_t error = 0;
> int lookup_flags;
>
> - if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
> + if ((at_flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
> return -EINVAL;
>
> - if (flags & AT_EMPTY_PATH && vfs_empty_path(dfd, pathname)) {
> + if (at_flags & AT_EMPTY_PATH && vfs_empty_path(dfd, pathname)) {
> CLASS(fd, f)(dfd);
>
> if (!f.file)
> @@ -965,22 +966,23 @@ static ssize_t do_listxattrat(int dfd, const char __user *pathname, char __user
> return error;
> }
>
> -SYSCALL_DEFINE5(listxattrat, int, dfd, const char __user *, pathname, char __user *, list,
> - size_t, size, int, flags)
> +SYSCALL_DEFINE5(listxattrat, int, dfd, const char __user *, pathname,
> + unsigned int, at_flags,
> + char __user *, list, size_t, size)
> {
> - return do_listxattrat(dfd, pathname, list, size, flags);
> + return do_listxattrat(dfd, pathname, at_flags, list, size);
> }
>
> SYSCALL_DEFINE3(listxattr, const char __user *, pathname, char __user *, list,
> size_t, size)
> {
> - return do_listxattrat(AT_FDCWD, pathname, list, size, 0);
> + return do_listxattrat(AT_FDCWD, pathname, 0, list, size);
> }
>
> SYSCALL_DEFINE3(llistxattr, const char __user *, pathname, char __user *, list,
> size_t, size)
> {
> - return do_listxattrat(AT_FDCWD, pathname, list, size, AT_SYMLINK_NOFOLLOW);
> + return do_listxattrat(AT_FDCWD, pathname, AT_SYMLINK_NOFOLLOW, list, size);
> }
>
> SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size)
> @@ -1019,17 +1021,17 @@ removexattr(struct mnt_idmap *idmap, struct dentry *d,
> }
>
> static int do_removexattrat(int dfd, const char __user *pathname,
> - const char __user *name, int flags)
> + unsigned int at_flags, const char __user *name)
> {
> struct path path;
> int error;
> int lookup_flags;
>
> - if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
> + if ((at_flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
> return -EINVAL;
>
> - lookup_flags = (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
> - if (flags & AT_EMPTY_PATH)
> + lookup_flags = (at_flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
> + if (at_flags & AT_EMPTY_PATH)
> lookup_flags |= LOOKUP_EMPTY;
> retry:
> error = user_path_at(dfd, pathname, lookup_flags, &path);
> @@ -1049,21 +1051,21 @@ static int do_removexattrat(int dfd, const char __user *pathname,
> }
>
> SYSCALL_DEFINE4(removexattrat, int, dfd, const char __user *, pathname,
> - const char __user *, name, int, flags)
> + unsigned int, at_flags, const char __user *, name)
> {
> - return do_removexattrat(dfd, pathname, name, flags);
> + return do_removexattrat(dfd, pathname, at_flags, name);
> }
>
> SYSCALL_DEFINE2(removexattr, const char __user *, pathname,
> const char __user *, name)
> {
> - return do_removexattrat(AT_FDCWD, pathname, name, 0);
> + return do_removexattrat(AT_FDCWD, pathname, 0, name);
> }
>
> SYSCALL_DEFINE2(lremovexattr, const char __user *, pathname,
> const char __user *, name)
> {
> - return do_removexattrat(AT_FDCWD, pathname, name, AT_SYMLINK_NOFOLLOW);
> + return do_removexattrat(AT_FDCWD, pathname, AT_SYMLINK_NOFOLLOW, name);
> }
>
> SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index e06fffc48535..ca3cba698602 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -356,15 +356,17 @@ asmlinkage long sys_fgetxattr(int fd, const char __user *name,
> void __user *value, size_t size);
> asmlinkage long sys_listxattr(const char __user *path, char __user *list,
> size_t size);
> -asmlinkage long sys_listxattrat(int dfd, const char __user *path, char __user *list,
> - size_t size, int flags);
> +asmlinkage long sys_listxattrat(int dfd, const char __user *path,
> + unsigned int at_flags,
> + char __user *list, size_t size);
> asmlinkage long sys_llistxattr(const char __user *path, char __user *list,
> size_t size);
> asmlinkage long sys_flistxattr(int fd, char __user *list, size_t size);
> asmlinkage long sys_removexattr(const char __user *path,
> const char __user *name);
> asmlinkage long sys_removexattrat(int dfd, const char __user *path,
> - const char __user *name, int flags);
> + unsigned int at_flags,
> + const char __user *name);
> asmlinkage long sys_lremovexattr(const char __user *path,
> const char __user *name);
> asmlinkage long sys_fremovexattr(int fd, const char __user *name);
> --
> 2.43.0
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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