mirror of
https://github.com/torvalds/linux.git
synced 2024-12-12 22:23:55 +00:00
e81f574da0
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
259 lines
5.5 KiB
C
259 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/file.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/io_uring.h>
|
|
#include <linux/xattr.h>
|
|
|
|
#include <uapi/linux/io_uring.h>
|
|
|
|
#include "../fs/internal.h"
|
|
|
|
#include "io_uring.h"
|
|
#include "xattr.h"
|
|
|
|
struct io_xattr {
|
|
struct file *file;
|
|
struct xattr_ctx ctx;
|
|
struct filename *filename;
|
|
};
|
|
|
|
void io_xattr_cleanup(struct io_kiocb *req)
|
|
{
|
|
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
|
|
|
|
if (ix->filename)
|
|
putname(ix->filename);
|
|
|
|
kfree(ix->ctx.kname);
|
|
kvfree(ix->ctx.kvalue);
|
|
}
|
|
|
|
static void io_xattr_finish(struct io_kiocb *req, int ret)
|
|
{
|
|
req->flags &= ~REQ_F_NEED_CLEANUP;
|
|
|
|
io_xattr_cleanup(req);
|
|
io_req_set_res(req, ret, 0);
|
|
}
|
|
|
|
static int __io_getxattr_prep(struct io_kiocb *req,
|
|
const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
|
|
const char __user *name;
|
|
int ret;
|
|
|
|
if (unlikely(req->flags & REQ_F_FIXED_FILE))
|
|
return -EBADF;
|
|
|
|
ix->filename = NULL;
|
|
ix->ctx.kvalue = NULL;
|
|
name = u64_to_user_ptr(READ_ONCE(sqe->addr));
|
|
ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
|
|
ix->ctx.size = READ_ONCE(sqe->len);
|
|
ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
|
|
|
|
if (ix->ctx.flags)
|
|
return -EINVAL;
|
|
|
|
ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
|
|
if (!ix->ctx.kname)
|
|
return -ENOMEM;
|
|
|
|
ret = strncpy_from_user(ix->ctx.kname->name, name,
|
|
sizeof(ix->ctx.kname->name));
|
|
if (!ret || ret == sizeof(ix->ctx.kname->name))
|
|
ret = -ERANGE;
|
|
if (ret < 0) {
|
|
kfree(ix->ctx.kname);
|
|
return ret;
|
|
}
|
|
|
|
req->flags |= REQ_F_NEED_CLEANUP;
|
|
return 0;
|
|
}
|
|
|
|
int io_fgetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
return __io_getxattr_prep(req, sqe);
|
|
}
|
|
|
|
int io_getxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
|
|
const char __user *path;
|
|
int ret;
|
|
|
|
ret = __io_getxattr_prep(req, sqe);
|
|
if (ret)
|
|
return ret;
|
|
|
|
path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
|
|
|
|
ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
|
|
if (IS_ERR(ix->filename)) {
|
|
ret = PTR_ERR(ix->filename);
|
|
ix->filename = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
|
|
int ret;
|
|
|
|
if (issue_flags & IO_URING_F_NONBLOCK)
|
|
return -EAGAIN;
|
|
|
|
ret = do_getxattr(mnt_user_ns(req->file->f_path.mnt),
|
|
req->file->f_path.dentry,
|
|
&ix->ctx);
|
|
|
|
io_xattr_finish(req, ret);
|
|
return IOU_OK;
|
|
}
|
|
|
|
int io_getxattr(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
|
|
unsigned int lookup_flags = LOOKUP_FOLLOW;
|
|
struct path path;
|
|
int ret;
|
|
|
|
if (issue_flags & IO_URING_F_NONBLOCK)
|
|
return -EAGAIN;
|
|
|
|
retry:
|
|
ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
|
|
if (!ret) {
|
|
ret = do_getxattr(mnt_user_ns(path.mnt),
|
|
path.dentry,
|
|
&ix->ctx);
|
|
|
|
path_put(&path);
|
|
if (retry_estale(ret, lookup_flags)) {
|
|
lookup_flags |= LOOKUP_REVAL;
|
|
goto retry;
|
|
}
|
|
}
|
|
|
|
io_xattr_finish(req, ret);
|
|
return IOU_OK;
|
|
}
|
|
|
|
static int __io_setxattr_prep(struct io_kiocb *req,
|
|
const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
|
|
const char __user *name;
|
|
int ret;
|
|
|
|
if (unlikely(req->flags & REQ_F_FIXED_FILE))
|
|
return -EBADF;
|
|
|
|
ix->filename = NULL;
|
|
name = u64_to_user_ptr(READ_ONCE(sqe->addr));
|
|
ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
|
|
ix->ctx.kvalue = NULL;
|
|
ix->ctx.size = READ_ONCE(sqe->len);
|
|
ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
|
|
|
|
ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
|
|
if (!ix->ctx.kname)
|
|
return -ENOMEM;
|
|
|
|
ret = setxattr_copy(name, &ix->ctx);
|
|
if (ret) {
|
|
kfree(ix->ctx.kname);
|
|
return ret;
|
|
}
|
|
|
|
req->flags |= REQ_F_NEED_CLEANUP;
|
|
return 0;
|
|
}
|
|
|
|
int io_setxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
|
|
const char __user *path;
|
|
int ret;
|
|
|
|
ret = __io_setxattr_prep(req, sqe);
|
|
if (ret)
|
|
return ret;
|
|
|
|
path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
|
|
|
|
ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
|
|
if (IS_ERR(ix->filename)) {
|
|
ret = PTR_ERR(ix->filename);
|
|
ix->filename = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int io_fsetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
return __io_setxattr_prep(req, sqe);
|
|
}
|
|
|
|
static int __io_setxattr(struct io_kiocb *req, unsigned int issue_flags,
|
|
const struct path *path)
|
|
{
|
|
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
|
|
int ret;
|
|
|
|
ret = mnt_want_write(path->mnt);
|
|
if (!ret) {
|
|
ret = do_setxattr(mnt_user_ns(path->mnt), path->dentry, &ix->ctx);
|
|
mnt_drop_write(path->mnt);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
int ret;
|
|
|
|
if (issue_flags & IO_URING_F_NONBLOCK)
|
|
return -EAGAIN;
|
|
|
|
ret = __io_setxattr(req, issue_flags, &req->file->f_path);
|
|
io_xattr_finish(req, ret);
|
|
return IOU_OK;
|
|
}
|
|
|
|
int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
|
|
unsigned int lookup_flags = LOOKUP_FOLLOW;
|
|
struct path path;
|
|
int ret;
|
|
|
|
if (issue_flags & IO_URING_F_NONBLOCK)
|
|
return -EAGAIN;
|
|
|
|
retry:
|
|
ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
|
|
if (!ret) {
|
|
ret = __io_setxattr(req, issue_flags, &path);
|
|
path_put(&path);
|
|
if (retry_estale(ret, lookup_flags)) {
|
|
lookup_flags |= LOOKUP_REVAL;
|
|
goto retry;
|
|
}
|
|
}
|
|
|
|
io_xattr_finish(req, ret);
|
|
return IOU_OK;
|
|
}
|