[mirror_ubuntu-kernels.git] / drivers / of / kexec.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2020 Arm Limited
 *
 * Based on arch/arm64/kernel/machine_kexec_file.c:
 *  Copyright (C) 2018 Linaro Limited
 *
 * And arch/powerpc/kexec/file_load.c:
 *  Copyright (C) 2016  IBM Corporation
 */

#include <linux/kernel.h>
#include <linux/kexec.h>
#include <linux/memblock.h>
#include <linux/libfdt.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/types.h>

#define RNG_SEED_SIZE		128

/*
 * Additional space needed for the FDT buffer so that we can add initrd,
 * bootargs, kaslr-seed, rng-seed, useable-memory-range and elfcorehdr.
 */
#define FDT_EXTRA_SPACE 0x1000

/**
 * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
 *
 * @fdt:	Flattened device tree for the current kernel.
 * @start:	Starting address of the reserved memory.
 * @size:	Size of the reserved memory.
 *
 * Return: 0 on success, or negative errno on error.
 */
static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned long size)
{
	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);

	for (i = 0; i < num_rsvs; i++) {
		u64 rsv_start, rsv_size;

		ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
		if (ret) {
			pr_err("Malformed device tree.\n");
			return -EINVAL;
		}

		if (rsv_start == start && rsv_size == size) {
			ret = fdt_del_mem_rsv(fdt, i);
			if (ret) {
				pr_err("Error deleting device tree reservation.\n");
				return -EINVAL;
			}

			return 0;
		}
	}

	return -ENOENT;
}

/**
 * get_addr_size_cells - Get address and size of root node
 *
 * @addr_cells: Return address of the root node
 * @size_cells: Return size of the root node
 *
 * Return: 0 on success, or negative errno on error.
 */
static int get_addr_size_cells(int *addr_cells, int *size_cells)
{
	struct device_node *root;

	root = of_find_node_by_path("/");
	if (!root)
		return -EINVAL;

	*addr_cells = of_n_addr_cells(root);
	*size_cells = of_n_size_cells(root);

	of_node_put(root);

	return 0;
}

/**
 * do_get_kexec_buffer - Get address and size of device tree property
 *
 * @prop: Device tree property
 * @len: Size of @prop
 * @addr: Return address of the node
 * @size: Return size of the node
 *
 * Return: 0 on success, or negative errno on error.
 */
static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
			       size_t *size)
{
	int ret, addr_cells, size_cells;

	ret = get_addr_size_cells(&addr_cells, &size_cells);
	if (ret)
		return ret;

	if (len < 4 * (addr_cells + size_cells))
		return -ENOENT;

	*addr = of_read_number(prop, addr_cells);
	*size = of_read_number(prop + 4 * addr_cells, size_cells);

	return 0;
}

/**
 * ima_get_kexec_buffer - get IMA buffer from the previous kernel
 * @addr:	On successful return, set to point to the buffer contents.
 * @size:	On successful return, set to the buffer size.
 *
 * Return: 0 on success, negative errno on error.
 */
int ima_get_kexec_buffer(void **addr, size_t *size)
{
	int ret, len;
	unsigned long tmp_addr;
	size_t tmp_size;
	const void *prop;

	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
		return -ENOTSUPP;

	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
	if (!prop)
		return -ENOENT;

	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
	if (ret)
		return ret;

	*addr = __va(tmp_addr);
	*size = tmp_size;

	return 0;
}

/**
 * ima_free_kexec_buffer - free memory used by the IMA buffer
 */
int ima_free_kexec_buffer(void)
{
	int ret;
	unsigned long addr;
	size_t size;
	struct property *prop;

	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
		return -ENOTSUPP;

	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
	if (!prop)
		return -ENOENT;

	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
	if (ret)
		return ret;

	ret = of_remove_property(of_chosen, prop);
	if (ret)
		return ret;

	return memblock_phys_free(addr, size);
}

/**
 * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
 *
 * @fdt: Flattened Device Tree to update
 * @chosen_node: Offset to the chosen node in the device tree
 *
 * The IMA measurement buffer is of no use to a subsequent kernel, so we always
 * remove it from the device tree.
 */
static void remove_ima_buffer(void *fdt, int chosen_node)
{
	int ret, len;
	unsigned long addr;
	size_t size;
	const void *prop;

	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
		return;

	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
	if (!prop)
		return;

	ret = do_get_kexec_buffer(prop, len, &addr, &size);
	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
	if (ret)
		return;

	ret = fdt_find_and_del_mem_rsv(fdt, addr, size);
	if (!ret)
		pr_debug("Removed old IMA buffer reservation.\n");
}

#ifdef CONFIG_IMA_KEXEC
/**
 * setup_ima_buffer - add IMA buffer information to the fdt
 * @image:		kexec image being loaded.
 * @fdt:		Flattened device tree for the next kernel.
 * @chosen_node:	Offset to the chosen node.
 *
 * Return: 0 on success, or negative errno on error.
 */
static int setup_ima_buffer(const struct kimage *image, void *fdt,
			    int chosen_node)
{
	int ret;

	if (!image->ima_buffer_size)
		return 0;

	ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
				       "linux,ima-kexec-buffer",
				       image->ima_buffer_addr,
				       image->ima_buffer_size);
	if (ret < 0)
		return -EINVAL;

	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
			      image->ima_buffer_size);
	if (ret)
		return -EINVAL;

	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
		 image->ima_buffer_addr, image->ima_buffer_size);

	return 0;
}
#else /* CONFIG_IMA_KEXEC */
static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
				   int chosen_node)
{
	return 0;
}
#endif /* CONFIG_IMA_KEXEC */

/*
 * of_kexec_alloc_and_setup_fdt - Alloc and setup a new Flattened Device Tree
 *
 * @image:		kexec image being loaded.
 * @initrd_load_addr:	Address where the next initrd will be loaded.
 * @initrd_len:		Size of the next initrd, or 0 if there will be none.
 * @cmdline:		Command line for the next kernel, or NULL if there will
 *			be none.
 * @extra_fdt_size:	Additional size for the new FDT buffer.
 *
 * Return: fdt on success, or NULL errno on error.
 */
void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
				   unsigned long initrd_load_addr,
				   unsigned long initrd_len,
				   const char *cmdline, size_t extra_fdt_size)
{
	void *fdt;
	int ret, chosen_node;
	const void *prop;
	size_t fdt_size;

	fdt_size = fdt_totalsize(initial_boot_params) +
		   (cmdline ? strlen(cmdline) : 0) +
		   FDT_EXTRA_SPACE +
		   extra_fdt_size;
	fdt = kvmalloc(fdt_size, GFP_KERNEL);
	if (!fdt)
		return NULL;

	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
	if (ret < 0) {
		pr_err("Error %d setting up the new device tree.\n", ret);
		goto out;
	}

	/* Remove memory reservation for the current device tree. */
	ret = fdt_find_and_del_mem_rsv(fdt, __pa(initial_boot_params),
				       fdt_totalsize(initial_boot_params));
	if (ret == -EINVAL) {
		pr_err("Error removing memory reservation.\n");
		goto out;
	}

	chosen_node = fdt_path_offset(fdt, "/chosen");
	if (chosen_node == -FDT_ERR_NOTFOUND)
		chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
					      "chosen");
	if (chosen_node < 0) {
		ret = chosen_node;
		goto out;
	}

	ret = fdt_delprop(fdt, chosen_node, "linux,elfcorehdr");
	if (ret && ret != -FDT_ERR_NOTFOUND)
		goto out;
	ret = fdt_delprop(fdt, chosen_node, "linux,usable-memory-range");
	if (ret && ret != -FDT_ERR_NOTFOUND)
		goto out;

	/* Did we boot using an initrd? */
	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
	if (prop) {
		u64 tmp_start, tmp_end, tmp_size;

		tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));

		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
		if (!prop) {
			ret = -EINVAL;
			goto out;
		}

		tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));

		/*
		 * kexec reserves exact initrd size, while firmware may
		 * reserve a multiple of PAGE_SIZE, so check for both.
		 */
		tmp_size = tmp_end - tmp_start;
		ret = fdt_find_and_del_mem_rsv(fdt, tmp_start, tmp_size);
		if (ret == -ENOENT)
			ret = fdt_find_and_del_mem_rsv(fdt, tmp_start,
						       round_up(tmp_size, PAGE_SIZE));
		if (ret == -EINVAL)
			goto out;
	}

	/* add initrd-* */
	if (initrd_load_addr) {
		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-start",
				      initrd_load_addr);
		if (ret)
			goto out;

		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",
				      initrd_load_addr + initrd_len);
		if (ret)
			goto out;

		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
		if (ret)
			goto out;

	} else {
		ret = fdt_delprop(fdt, chosen_node, "linux,initrd-start");
		if (ret && (ret != -FDT_ERR_NOTFOUND))
			goto out;

		ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end");
		if (ret && (ret != -FDT_ERR_NOTFOUND))
			goto out;
	}

	if (image->type == KEXEC_TYPE_CRASH) {
		/* add linux,elfcorehdr */
		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
				"linux,elfcorehdr", image->elf_load_addr,
				image->elf_headers_sz);
		if (ret)
			goto out;

		/*
		 * Avoid elfcorehdr from being stomped on in kdump kernel by
		 * setting up memory reserve map.
		 */
		ret = fdt_add_mem_rsv(fdt, image->elf_load_addr,
				      image->elf_headers_sz);
		if (ret)
			goto out;

		/* add linux,usable-memory-range */
		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
				"linux,usable-memory-range", crashk_res.start,
				crashk_res.end - crashk_res.start + 1);
		if (ret)
			goto out;
	}

	/* add bootargs */
	if (cmdline) {
		ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline);
		if (ret)
			goto out;
	} else {
		ret = fdt_delprop(fdt, chosen_node, "bootargs");
		if (ret && (ret != -FDT_ERR_NOTFOUND))
			goto out;
	}

	/* add kaslr-seed */
	ret = fdt_delprop(fdt, chosen_node, "kaslr-seed");
	if (ret == -FDT_ERR_NOTFOUND)
		ret = 0;
	else if (ret)
		goto out;

	if (rng_is_initialized()) {
		u64 seed = get_random_u64();

		ret = fdt_setprop_u64(fdt, chosen_node, "kaslr-seed", seed);
		if (ret)
			goto out;
	} else {
		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
			  "kaslr-seed");
	}

	/* add rng-seed */
	if (rng_is_initialized()) {
		void *rng_seed;

		ret = fdt_setprop_placeholder(fdt, chosen_node, "rng-seed",
				RNG_SEED_SIZE, &rng_seed);
		if (ret)
			goto out;
		get_random_bytes(rng_seed, RNG_SEED_SIZE);
	} else {
		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
			  "rng-seed");
	}

	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
	if (ret)
		goto out;

	remove_ima_buffer(fdt, chosen_node);
	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));

out:
	if (ret) {
		kvfree(fdt);
		fdt = NULL;
	}

	return fdt;
}
Commit	Line	Data
b30be4dc RH	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* Copyright (C) 2020 Arm Limited
	4	*
	5	* Based on arch/arm64/kernel/machine_kexec_file.c:
	6	* Copyright (C) 2018 Linaro Limited
	7	*
	8	* And arch/powerpc/kexec/file_load.c:
	9	* Copyright (C) 2016 IBM Corporation
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/kexec.h>
fee3ff99	14	#include <linux/memblock.h>
b30be4dc RH	15	#include <linux/libfdt.h>
	16	#include <linux/of.h>
	17	#include <linux/of_fdt.h>
	18	#include <linux/random.h>
8587ca6f	19	#include <linux/slab.h>
b30be4dc RH	20	#include <linux/types.h>
b30be4dc RH	21
b30be4dc RH	22	#define RNG_SEED_SIZE 128
	23
	24	/*
	25	* Additional space needed for the FDT buffer so that we can add initrd,
	26	* bootargs, kaslr-seed, rng-seed, useable-memory-range and elfcorehdr.
	27	*/
	28	#define FDT_EXTRA_SPACE 0x1000
	29
	30	/**
	31	* fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
	32	*
	33	* @fdt: Flattened device tree for the current kernel.
	34	* @start: Starting address of the reserved memory.
	35	* @size: Size of the reserved memory.
	36	*
	37	* Return: 0 on success, or negative errno on error.
	38	*/
	39	static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned long size)
	40	{
	41	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
	42
	43	for (i = 0; i < num_rsvs; i++) {
	44	u64 rsv_start, rsv_size;
	45
	46	ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
	47	if (ret) {
	48	pr_err("Malformed device tree.\n");
	49	return -EINVAL;
	50	}
	51
	52	if (rsv_start == start && rsv_size == size) {
	53	ret = fdt_del_mem_rsv(fdt, i);
	54	if (ret) {
	55	pr_err("Error deleting device tree reservation.\n");
	56	return -EINVAL;
	57	}
	58
	59	return 0;
	60	}
	61	}
	62
	63	return -ENOENT;
	64	}
	65
fee3ff99 LR	66	/**
	67	* get_addr_size_cells - Get address and size of root node
	68	*
	69	* @addr_cells: Return address of the root node
	70	* @size_cells: Return size of the root node
	71	*
	72	* Return: 0 on success, or negative errno on error.
	73	*/
	74	static int get_addr_size_cells(int addr_cells, int size_cells)
	75	{
	76	struct device_node *root;
	77
	78	root = of_find_node_by_path("/");
	79	if (!root)
	80	return -EINVAL;
	81
	82	*addr_cells = of_n_addr_cells(root);
	83	*size_cells = of_n_size_cells(root);
	84
	85	of_node_put(root);
	86
	87	return 0;
	88	}
	89
	90	/**
	91	* do_get_kexec_buffer - Get address and size of device tree property
	92	*
	93	* @prop: Device tree property
	94	* @len: Size of @prop
	95	* @addr: Return address of the node
	96	* @size: Return size of the node
	97	*
	98	* Return: 0 on success, or negative errno on error.
	99	*/
	100	static int do_get_kexec_buffer(const void prop, int len, unsigned long addr,
	101	size_t *size)
	102	{
	103	int ret, addr_cells, size_cells;
	104
	105	ret = get_addr_size_cells(&addr_cells, &size_cells);
	106	if (ret)
	107	return ret;
	108
	109	if (len < 4 * (addr_cells + size_cells))
	110	return -ENOENT;
	111
	112	*addr = of_read_number(prop, addr_cells);
	113	size = of_read_number(prop + 4 addr_cells, size_cells);
	114
	115	return 0;
	116	}
	117
	118	/**
	119	* ima_get_kexec_buffer - get IMA buffer from the previous kernel
	120	* @addr: On successful return, set to point to the buffer contents.
	121	* @size: On successful return, set to the buffer size.
	122	*
	123	* Return: 0 on success, negative errno on error.
	124	*/
	125	int ima_get_kexec_buffer(void *addr, size_t size)
	126	{
	127	int ret, len;
	128	unsigned long tmp_addr;
	129	size_t tmp_size;
130	const void *prop;
131
132	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
133	return -ENOTSUPP;
134
135	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
136	if (!prop)
137	return -ENOENT;
138
139	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
140	if (ret)
141	return ret;
142
143	*addr = __va(tmp_addr);
144	*size = tmp_size;
145
146	return 0;
147	}
148
149	/**
150	* ima_free_kexec_buffer - free memory used by the IMA buffer
151	*/
152	int ima_free_kexec_buffer(void)
153	{
154	int ret;
155	unsigned long addr;
156	size_t size;
157	struct property *prop;
158
159	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
160	return -ENOTSUPP;
161
162	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
163	if (!prop)
164	return -ENOENT;
165
166	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
167	if (ret)
168	return ret;
169
170	ret = of_remove_property(of_chosen, prop);
171	if (ret)
172	return ret;
173
3ecc6834	174	return memblock_phys_free(addr, size);
fee3ff99 LR	175	}
	176
	177	/**
	178	* remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
	179	*
	180	* @fdt: Flattened Device Tree to update
	181	* @chosen_node: Offset to the chosen node in the device tree
	182	*
	183	* The IMA measurement buffer is of no use to a subsequent kernel, so we always
	184	* remove it from the device tree.
	185	*/
	186	static void remove_ima_buffer(void *fdt, int chosen_node)
	187	{
	188	int ret, len;
	189	unsigned long addr;
	190	size_t size;
	191	const void *prop;
	192
	193	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
	194	return;
	195
	196	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
	197	if (!prop)
	198	return;
	199
	200	ret = do_get_kexec_buffer(prop, len, &addr, &size);
	201	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
	202	if (ret)
	203	return;
	204
	205	ret = fdt_find_and_del_mem_rsv(fdt, addr, size);
	206	if (!ret)
	207	pr_debug("Removed old IMA buffer reservation.\n");
	208	}
	209
	210	#ifdef CONFIG_IMA_KEXEC
fee3ff99 LR	211	/**
	212	* setup_ima_buffer - add IMA buffer information to the fdt
	213	* @image: kexec image being loaded.
	214	* @fdt: Flattened device tree for the next kernel.
	215	* @chosen_node: Offset to the chosen node.
	216	*
	217	* Return: 0 on success, or negative errno on error.
	218	*/
	219	static int setup_ima_buffer(const struct kimage image, void fdt,
	220	int chosen_node)
	221	{
28db15d4	222	int ret;
fee3ff99 LR	223
	224	if (!image->ima_buffer_size)
	225	return 0;
	226
28db15d4 LR	227	ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
	228	"linux,ima-kexec-buffer",
	229	image->ima_buffer_addr,
	230	image->ima_buffer_size);
fee3ff99 LR	231	if (ret < 0)
	232	return -EINVAL;
	233
	234	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
	235	image->ima_buffer_size);
	236	if (ret)
	237	return -EINVAL;
	238
	239	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
	240	image->ima_buffer_addr, image->ima_buffer_size);
	241
	242	return 0;
	243	}
	244	#else /* CONFIG_IMA_KEXEC */
	245	static inline int setup_ima_buffer(const struct kimage image, void fdt,
	246	int chosen_node)
	247	{
	248	return 0;
	249	}
	250	#endif /* CONFIG_IMA_KEXEC */
	251
b30be4dc RH	252	/*
	253	* of_kexec_alloc_and_setup_fdt - Alloc and setup a new Flattened Device Tree
	254	*
	255	* @image: kexec image being loaded.
	256	* @initrd_load_addr: Address where the next initrd will be loaded.
	257	* @initrd_len: Size of the next initrd, or 0 if there will be none.
	258	* @cmdline: Command line for the next kernel, or NULL if there will
	259	* be none.
	260	* @extra_fdt_size: Additional size for the new FDT buffer.
	261	*
	262	* Return: fdt on success, or NULL errno on error.
	263	*/
	264	void of_kexec_alloc_and_setup_fdt(const struct kimage image,
	265	unsigned long initrd_load_addr,
	266	unsigned long initrd_len,
	267	const char *cmdline, size_t extra_fdt_size)
	268	{
	269	void *fdt;
	270	int ret, chosen_node;
	271	const void *prop;
	272	size_t fdt_size;
	273
	274	fdt_size = fdt_totalsize(initial_boot_params) +
	275	(cmdline ? strlen(cmdline) : 0) +
	276	FDT_EXTRA_SPACE +
	277	extra_fdt_size;
	278	fdt = kvmalloc(fdt_size, GFP_KERNEL);
	279	if (!fdt)
	280	return NULL;
	281
	282	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
	283	if (ret < 0) {
	284	pr_err("Error %d setting up the new device tree.\n", ret);
	285	goto out;
	286	}
	287
	288	/* Remove memory reservation for the current device tree. */
	289	ret = fdt_find_and_del_mem_rsv(fdt, __pa(initial_boot_params),
	290	fdt_totalsize(initial_boot_params));
	291	if (ret == -EINVAL) {
	292	pr_err("Error removing memory reservation.\n");
	293	goto out;
	294	}
	295
	296	chosen_node = fdt_path_offset(fdt, "/chosen");
	297	if (chosen_node == -FDT_ERR_NOTFOUND)
	298	chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
	299	"chosen");
	300	if (chosen_node < 0) {
	301	ret = chosen_node;
	302	goto out;
	303	}
	304
cc6ef3d1	305	ret = fdt_delprop(fdt, chosen_node, "linux,elfcorehdr");
b30be4dc RH	306	if (ret && ret != -FDT_ERR_NOTFOUND)
b30be4dc RH	307	goto out;
cc6ef3d1	308	ret = fdt_delprop(fdt, chosen_node, "linux,usable-memory-range");
b30be4dc RH	309	if (ret && ret != -FDT_ERR_NOTFOUND)
	310	goto out;
	311
	312	/* Did we boot using an initrd? */
	313	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
	314	if (prop) {
	315	u64 tmp_start, tmp_end, tmp_size;
	316
	317	tmp_start = fdt64_to_cpu(((const fdt64_t ) prop));
	318
	319	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
	320	if (!prop) {
	321	ret = -EINVAL;
	322	goto out;
	323	}
	324
	325	tmp_end = fdt64_to_cpu(((const fdt64_t ) prop));
	326
	327	/*
	328	* kexec reserves exact initrd size, while firmware may
	329	* reserve a multiple of PAGE_SIZE, so check for both.
	330	*/
	331	tmp_size = tmp_end - tmp_start;
	332	ret = fdt_find_and_del_mem_rsv(fdt, tmp_start, tmp_size);
	333	if (ret == -ENOENT)
	334	ret = fdt_find_and_del_mem_rsv(fdt, tmp_start,
	335	round_up(tmp_size, PAGE_SIZE));
	336	if (ret == -EINVAL)
	337	goto out;
	338	}
	339
	340	/* add initrd-* */
	341	if (initrd_load_addr) {
cc6ef3d1	342	ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-start",
b30be4dc RH	343	initrd_load_addr);
	344	if (ret)
	345	goto out;
	346
cc6ef3d1	347	ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",
b30be4dc RH	348	initrd_load_addr + initrd_len);
	349	if (ret)
	350	goto out;
	351
	352	ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
	353	if (ret)
	354	goto out;
	355
	356	} else {
cc6ef3d1	357	ret = fdt_delprop(fdt, chosen_node, "linux,initrd-start");
b30be4dc RH	358	if (ret && (ret != -FDT_ERR_NOTFOUND))
	359	goto out;
	360
cc6ef3d1	361	ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end");
b30be4dc RH	362	if (ret && (ret != -FDT_ERR_NOTFOUND))
	363	goto out;
	364	}
	365
	366	if (image->type == KEXEC_TYPE_CRASH) {
	367	/* add linux,elfcorehdr */
	368	ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
cc6ef3d1	369	"linux,elfcorehdr", image->elf_load_addr,
b30be4dc RH	370	image->elf_headers_sz);
	371	if (ret)
	372	goto out;
	373
	374	/*
	375	* Avoid elfcorehdr from being stomped on in kdump kernel by
	376	* setting up memory reserve map.
	377	*/
	378	ret = fdt_add_mem_rsv(fdt, image->elf_load_addr,
	379	image->elf_headers_sz);
	380	if (ret)
	381	goto out;
	382
	383	/* add linux,usable-memory-range */
	384	ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
cc6ef3d1	385	"linux,usable-memory-range", crashk_res.start,
b30be4dc RH	386	crashk_res.end - crashk_res.start + 1);
	387	if (ret)
	388	goto out;
	389	}
	390
	391	/* add bootargs */
	392	if (cmdline) {
cc6ef3d1	393	ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline);
b30be4dc RH	394	if (ret)
	395	goto out;
	396	} else {
cc6ef3d1	397	ret = fdt_delprop(fdt, chosen_node, "bootargs");
b30be4dc RH	398	if (ret && (ret != -FDT_ERR_NOTFOUND))
	399	goto out;
	400	}
	401
	402	/* add kaslr-seed */
cc6ef3d1	403	ret = fdt_delprop(fdt, chosen_node, "kaslr-seed");
b30be4dc RH	404	if (ret == -FDT_ERR_NOTFOUND)
	405	ret = 0;
	406	else if (ret)
	407	goto out;
	408
	409	if (rng_is_initialized()) {
	410	u64 seed = get_random_u64();
	411
cc6ef3d1	412	ret = fdt_setprop_u64(fdt, chosen_node, "kaslr-seed", seed);
b30be4dc RH	413	if (ret)
	414	goto out;
	415	} else {
	416	pr_notice("RNG is not initialised: omitting \"%s\" property\n",
cc6ef3d1	417	"kaslr-seed");
b30be4dc RH	418	}
	419
	420	/* add rng-seed */
	421	if (rng_is_initialized()) {
	422	void *rng_seed;
	423
cc6ef3d1	424	ret = fdt_setprop_placeholder(fdt, chosen_node, "rng-seed",
b30be4dc RH	425	RNG_SEED_SIZE, &rng_seed);
	426	if (ret)
	427	goto out;
	428	get_random_bytes(rng_seed, RNG_SEED_SIZE);
	429	} else {
	430	pr_notice("RNG is not initialised: omitting \"%s\" property\n",
cc6ef3d1	431	"rng-seed");
b30be4dc RH	432	}
	433
	434	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
fee3ff99 LR	435	if (ret)
	436	goto out;
	437
	438	remove_ima_buffer(fdt, chosen_node);
	439	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
b30be4dc RH	440
	441	out:
	442	if (ret) {
	443	kvfree(fdt);
	444	fdt = NULL;
	445	}
	446
	447	return fdt;
	448	}