[linux.git] / io_uring / xattr.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_idmap(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_idmap(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_idmap(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;
}
Commit	Line	Data
5e2a18d9 JA	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/kernel.h>
	3	#include <linux/errno.h>
	4	#include <linux/fs.h>
	5	#include <linux/file.h>
	6	#include <linux/mm.h>
	7	#include <linux/slab.h>
	8	#include <linux/namei.h>
	9	#include <linux/io_uring.h>
	10	#include <linux/xattr.h>
	11
	12	#include <uapi/linux/io_uring.h>
	13
	14	#include "../fs/internal.h"
	15
5e2a18d9 JA	16	#include "io_uring.h"
	17	#include "xattr.h"
	18
	19	struct io_xattr {
	20	struct file *file;
	21	struct xattr_ctx ctx;
	22	struct filename *filename;
	23	};
	24
	25	void io_xattr_cleanup(struct io_kiocb *req)
	26	{
f2ccb5ae	27	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	28
	29	if (ix->filename)
	30	putname(ix->filename);
	31
	32	kfree(ix->ctx.kname);
	33	kvfree(ix->ctx.kvalue);
	34	}
	35
	36	static void io_xattr_finish(struct io_kiocb *req, int ret)
	37	{
	38	req->flags &= ~REQ_F_NEED_CLEANUP;
	39
	40	io_xattr_cleanup(req);
	41	io_req_set_res(req, ret, 0);
	42	}
	43
	44	static int __io_getxattr_prep(struct io_kiocb *req,
	45	const struct io_uring_sqe *sqe)
	46	{
f2ccb5ae	47	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	48	const char __user *name;
	49	int ret;
	50
	51	if (unlikely(req->flags & REQ_F_FIXED_FILE))
	52	return -EBADF;
	53
	54	ix->filename = NULL;
	55	ix->ctx.kvalue = NULL;
	56	name = u64_to_user_ptr(READ_ONCE(sqe->addr));
	57	ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
	58	ix->ctx.size = READ_ONCE(sqe->len);
	59	ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
	60
	61	if (ix->ctx.flags)
	62	return -EINVAL;
	63
	64	ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
	65	if (!ix->ctx.kname)
	66	return -ENOMEM;
	67
	68	ret = strncpy_from_user(ix->ctx.kname->name, name,
	69	sizeof(ix->ctx.kname->name));
	70	if (!ret \|\| ret == sizeof(ix->ctx.kname->name))
	71	ret = -ERANGE;
	72	if (ret < 0) {
	73	kfree(ix->ctx.kname);
	74	return ret;
	75	}
	76
	77	req->flags \|= REQ_F_NEED_CLEANUP;
	78	return 0;
	79	}
	80
	81	int io_fgetxattr_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	82	{
	83	return __io_getxattr_prep(req, sqe);
	84	}
	85
	86	int io_getxattr_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	87	{
f2ccb5ae	88	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	89	const char __user *path;
	90	int ret;
	91
	92	ret = __io_getxattr_prep(req, sqe);
	93	if (ret)
	94	return ret;
	95
	96	path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
	97
	98	ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
	99	if (IS_ERR(ix->filename)) {
	100	ret = PTR_ERR(ix->filename);
	101	ix->filename = NULL;
	102	}
	103
	104	return ret;
	105	}
	106
	107	int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
	108	{
f2ccb5ae	109	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	110	int ret;
	111
	112	if (issue_flags & IO_URING_F_NONBLOCK)
	113	return -EAGAIN;
	114
5a6f52d2	115	ret = do_getxattr(mnt_idmap(req->file->f_path.mnt),
5e2a18d9 JA	116	req->file->f_path.dentry,
	117	&ix->ctx);
	118
	119	io_xattr_finish(req, ret);
	120	return IOU_OK;
	121	}
	122
	123	int io_getxattr(struct io_kiocb *req, unsigned int issue_flags)
	124	{
f2ccb5ae	125	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	126	unsigned int lookup_flags = LOOKUP_FOLLOW;
	127	struct path path;
	128	int ret;
	129
	130	if (issue_flags & IO_URING_F_NONBLOCK)
	131	return -EAGAIN;
	132
	133	retry:
	134	ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
	135	if (!ret) {
5a6f52d2	136	ret = do_getxattr(mnt_idmap(path.mnt), path.dentry, &ix->ctx);
5e2a18d9 JA	137
	138	path_put(&path);
	139	if (retry_estale(ret, lookup_flags)) {
	140	lookup_flags \|= LOOKUP_REVAL;
	141	goto retry;
	142	}
	143	}
	144
	145	io_xattr_finish(req, ret);
	146	return IOU_OK;
	147	}
	148
	149	static int __io_setxattr_prep(struct io_kiocb *req,
	150	const struct io_uring_sqe *sqe)
	151	{
f2ccb5ae	152	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	153	const char __user *name;
	154	int ret;
	155
	156	if (unlikely(req->flags & REQ_F_FIXED_FILE))
	157	return -EBADF;
	158
	159	ix->filename = NULL;
	160	name = u64_to_user_ptr(READ_ONCE(sqe->addr));
	161	ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
	162	ix->ctx.kvalue = NULL;
	163	ix->ctx.size = READ_ONCE(sqe->len);
	164	ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
	165
	166	ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
	167	if (!ix->ctx.kname)
	168	return -ENOMEM;
	169
	170	ret = setxattr_copy(name, &ix->ctx);
	171	if (ret) {
	172	kfree(ix->ctx.kname);
	173	return ret;
	174	}
	175
	176	req->flags \|= REQ_F_NEED_CLEANUP;
	177	return 0;
	178	}
	179
	180	int io_setxattr_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	181	{
f2ccb5ae	182	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	183	const char __user *path;
	184	int ret;
	185
	186	ret = __io_setxattr_prep(req, sqe);
	187	if (ret)
	188	return ret;
	189
	190	path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
	191
	192	ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
	193	if (IS_ERR(ix->filename)) {
	194	ret = PTR_ERR(ix->filename);
	195	ix->filename = NULL;
	196	}
	197
	198	return ret;
	199	}
	200
	201	int io_fsetxattr_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	202	{
	203	return __io_setxattr_prep(req, sqe);
	204	}
	205
	206	static int __io_setxattr(struct io_kiocb *req, unsigned int issue_flags,
e81f574d	207	const struct path *path)
5e2a18d9	208	{
f2ccb5ae	209	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	210	int ret;
	211
	212	ret = mnt_want_write(path->mnt);
	213	if (!ret) {
5a6f52d2	214	ret = do_setxattr(mnt_idmap(path->mnt), path->dentry, &ix->ctx);
5e2a18d9 JA	215	mnt_drop_write(path->mnt);
	216	}
	217
	218	return ret;
	219	}
	220
	221	int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
	222	{
	223	int ret;
	224
	225	if (issue_flags & IO_URING_F_NONBLOCK)
	226	return -EAGAIN;
	227
	228	ret = __io_setxattr(req, issue_flags, &req->file->f_path);
	229	io_xattr_finish(req, ret);
	230	return IOU_OK;
	231	}
	232
	233	int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
	234	{
f2ccb5ae	235	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	236	unsigned int lookup_flags = LOOKUP_FOLLOW;
	237	struct path path;
	238	int ret;
	239
	240	if (issue_flags & IO_URING_F_NONBLOCK)
	241	return -EAGAIN;
	242
	243	retry:
	244	ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
	245	if (!ret) {
	246	ret = __io_setxattr(req, issue_flags, &path);
	247	path_put(&path);
	248	if (retry_estale(ret, lookup_flags)) {
	249	lookup_flags \|= LOOKUP_REVAL;
	250	goto retry;
	251	}
	252	}
	253
	254	io_xattr_finish(req, ret);
	255	return IOU_OK;
	256	}