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