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2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
220 lines
4.7 KiB
C
220 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 IBM Corporation
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*
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* Authors:
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* Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
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*/
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#include <linux/slab.h>
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#include <linux/kexec.h>
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#include <linux/of.h>
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#include <linux/memblock.h>
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#include <linux/libfdt.h>
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static int get_addr_size_cells(int *addr_cells, int *size_cells)
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{
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struct device_node *root;
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root = of_find_node_by_path("/");
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if (!root)
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return -EINVAL;
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*addr_cells = of_n_addr_cells(root);
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*size_cells = of_n_size_cells(root);
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of_node_put(root);
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return 0;
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}
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static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
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size_t *size)
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{
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int ret, addr_cells, size_cells;
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ret = get_addr_size_cells(&addr_cells, &size_cells);
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if (ret)
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return ret;
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if (len < 4 * (addr_cells + size_cells))
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return -ENOENT;
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*addr = of_read_number(prop, addr_cells);
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*size = of_read_number(prop + 4 * addr_cells, size_cells);
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return 0;
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}
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/**
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* ima_get_kexec_buffer - get IMA buffer from the previous kernel
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* @addr: On successful return, set to point to the buffer contents.
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* @size: On successful return, set to the buffer size.
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*
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* Return: 0 on success, negative errno on error.
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*/
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int ima_get_kexec_buffer(void **addr, size_t *size)
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{
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int ret, len;
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unsigned long tmp_addr;
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size_t tmp_size;
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const void *prop;
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prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
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if (!prop)
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return -ENOENT;
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ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
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if (ret)
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return ret;
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*addr = __va(tmp_addr);
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*size = tmp_size;
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return 0;
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}
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/**
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* ima_free_kexec_buffer - free memory used by the IMA buffer
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*/
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int ima_free_kexec_buffer(void)
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{
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int ret;
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unsigned long addr;
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size_t size;
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struct property *prop;
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prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
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if (!prop)
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return -ENOENT;
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ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
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if (ret)
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return ret;
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ret = of_remove_property(of_chosen, prop);
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if (ret)
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return ret;
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return memblock_free(addr, size);
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}
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/**
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* remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
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*
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* The IMA measurement buffer is of no use to a subsequent kernel, so we always
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* remove it from the device tree.
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*/
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void remove_ima_buffer(void *fdt, int chosen_node)
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{
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int ret, len;
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unsigned long addr;
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size_t size;
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const void *prop;
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prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
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if (!prop)
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return;
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ret = do_get_kexec_buffer(prop, len, &addr, &size);
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fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
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if (ret)
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return;
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ret = delete_fdt_mem_rsv(fdt, addr, size);
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if (!ret)
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pr_debug("Removed old IMA buffer reservation.\n");
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}
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#ifdef CONFIG_IMA_KEXEC
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/**
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* arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer
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*
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* Architectures should use this function to pass on the IMA buffer
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* information to the next kernel.
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*
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* Return: 0 on success, negative errno on error.
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*/
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int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
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size_t size)
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{
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image->arch.ima_buffer_addr = load_addr;
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image->arch.ima_buffer_size = size;
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return 0;
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}
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static int write_number(void *p, u64 value, int cells)
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{
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if (cells == 1) {
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u32 tmp;
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if (value > U32_MAX)
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return -EINVAL;
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tmp = cpu_to_be32(value);
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memcpy(p, &tmp, sizeof(tmp));
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} else if (cells == 2) {
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u64 tmp;
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tmp = cpu_to_be64(value);
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memcpy(p, &tmp, sizeof(tmp));
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} else
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return -EINVAL;
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return 0;
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}
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/**
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* setup_ima_buffer - add IMA buffer information to the fdt
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* @image: kexec image being loaded.
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* @fdt: Flattened device tree for the next kernel.
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* @chosen_node: Offset to the chosen node.
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*
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* Return: 0 on success, or negative errno on error.
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*/
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int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
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{
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int ret, addr_cells, size_cells, entry_size;
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u8 value[16];
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remove_ima_buffer(fdt, chosen_node);
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if (!image->arch.ima_buffer_size)
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return 0;
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ret = get_addr_size_cells(&addr_cells, &size_cells);
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if (ret)
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return ret;
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entry_size = 4 * (addr_cells + size_cells);
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if (entry_size > sizeof(value))
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return -EINVAL;
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ret = write_number(value, image->arch.ima_buffer_addr, addr_cells);
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if (ret)
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return ret;
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ret = write_number(value + 4 * addr_cells, image->arch.ima_buffer_size,
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size_cells);
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if (ret)
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return ret;
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ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
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entry_size);
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if (ret < 0)
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return -EINVAL;
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ret = fdt_add_mem_rsv(fdt, image->arch.ima_buffer_addr,
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image->arch.ima_buffer_size);
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if (ret)
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return -EINVAL;
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pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
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image->arch.ima_buffer_addr, image->arch.ima_buffer_size);
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return 0;
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}
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#endif /* CONFIG_IMA_KEXEC */
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