powerpc: Move arch independent ima kexec functions to drivers/of/kexec.c
The functions defined in "arch/powerpc/kexec/ima.c" handle setting up and freeing the resources required to carry over the IMA measurement list from the current kernel to the next kernel across kexec system call. These functions do not have architecture specific code, but are currently limited to powerpc. Move remove_ima_buffer() and setup_ima_buffer() calls into of_kexec_alloc_and_setup_fdt() defined in "drivers/of/kexec.c". Move the remaining architecture independent functions from "arch/powerpc/kexec/ima.c" to "drivers/of/kexec.c". Delete "arch/powerpc/kexec/ima.c" and "arch/powerpc/include/asm/ima.h". Remove references to the deleted files and functions in powerpc and in ima. Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com> Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Tested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20210221174930.27324-11-nramas@linux.microsoft.com
This commit is contained in:
Lakshmi Ramasubramanian
Rob Herring
Родитель
39652741c8
Коммит
fee3ff99bc
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@ -1,27 +0,0 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_IMA_H
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#define _ASM_POWERPC_IMA_H
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struct kimage;
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int ima_get_kexec_buffer(void **addr, size_t *size);
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int ima_free_kexec_buffer(void);
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#ifdef CONFIG_IMA
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void remove_ima_buffer(void *fdt, int chosen_node);
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#else
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static inline void remove_ima_buffer(void *fdt, int chosen_node) {}
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#endif
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#ifdef CONFIG_IMA_KEXEC
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int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node);
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#else
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static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
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int chosen_node)
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{
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remove_ima_buffer(fdt, chosen_node);
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return 0;
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}
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#endif /* CONFIG_IMA_KEXEC */
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#endif /* _ASM_POWERPC_IMA_H */
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@ -115,9 +115,6 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
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int setup_purgatory(struct kimage *image, const void *slave_code,
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const void *fdt, unsigned long kernel_load_addr,
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unsigned long fdt_load_addr);
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int setup_new_fdt(const struct kimage *image, void *fdt,
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unsigned long initrd_load_addr, unsigned long initrd_len,
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const char *cmdline);
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int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
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#ifdef CONFIG_PPC64
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@ -9,13 +9,6 @@ obj-$(CONFIG_PPC32) += relocate_32.o
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obj-$(CONFIG_KEXEC_FILE) += file_load.o ranges.o file_load_$(BITS).o elf_$(BITS).o
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ifdef CONFIG_HAVE_IMA_KEXEC
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ifdef CONFIG_IMA
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obj-y += ima.o
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endif
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endif
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# Disable GCOV, KCOV & sanitizers in odd or sensitive code
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GCOV_PROFILE_core_$(BITS).o := n
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KCOV_INSTRUMENT_core_$(BITS).o := n
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@ -19,7 +19,6 @@
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#include <linux/of_fdt.h>
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#include <linux/libfdt.h>
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#include <asm/setup.h>
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#include <asm/ima.h>
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#define SLAVE_CODE_SIZE 256 /* First 0x100 bytes */
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@ -140,27 +139,3 @@ int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
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return -ENOENT;
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}
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/*
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* setup_new_fdt - modify /chosen and memory reservation for the next kernel
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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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* @initrd_load_addr: Address where the next initrd will be loaded.
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* @initrd_len: Size of the next initrd, or 0 if there will be none.
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* @cmdline: Command line for the next kernel, or NULL if there will
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* be none.
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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_new_fdt(const struct kimage *image, void *fdt,
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unsigned long initrd_load_addr, unsigned long initrd_len,
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const char *cmdline)
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{
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int ret;
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ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
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if (ret)
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pr_err("Error setting up the new device tree.\n");
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return ret;
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}
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@ -979,10 +979,6 @@ int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
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struct crash_mem *umem = NULL, *rmem = NULL;
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int i, nr_ranges, ret;
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ret = setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
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if (ret)
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goto out;
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/*
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* Restrict memory usage for kdump kernel by setting up
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* usable memory ranges and memory reserve map.
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@ -1,202 +0,0 @@
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// 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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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->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->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->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->ima_buffer_addr,
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image->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->ima_buffer_addr, image->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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@ -11,6 +11,7 @@
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#include <linux/kernel.h>
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#include <linux/kexec.h>
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#include <linux/memblock.h>
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#include <linux/libfdt.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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@ -69,6 +70,240 @@ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
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return -ENOENT;
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}
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/**
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* get_addr_size_cells - Get address and size of root node
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*
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* @addr_cells: Return address of the root node
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* @size_cells: Return size of the root 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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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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/**
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* do_get_kexec_buffer - Get address and size of device tree property
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*
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* @prop: Device tree property
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* @len: Size of @prop
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* @addr: Return address of the node
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* @size: Return size of the 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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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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if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
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return -ENOTSUPP;
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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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|
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if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
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return -ENOTSUPP;
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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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|
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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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* @fdt: Flattened Device Tree to update
|
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* @chosen_node: Offset to the chosen node in the device tree
|
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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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static 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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|
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if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
|
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return;
|
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|
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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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|
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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)
|
||||
return;
|
||||
|
||||
ret = fdt_find_and_del_mem_rsv(fdt, addr, size);
|
||||
if (!ret)
|
||||
pr_debug("Removed old IMA buffer reservation.\n");
|
||||
}
|
||||
|
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#ifdef CONFIG_IMA_KEXEC
|
||||
/**
|
||||
* write_number - Convert number to big-endian format
|
||||
*
|
||||
* @p: Buffer to write the number to
|
||||
* @value: Number to convert
|
||||
* @cells: Number of cells
|
||||
*
|
||||
* Return: 0 on success, or negative errno on error.
|
||||
*/
|
||||
static int write_number(void *p, u64 value, int cells)
|
||||
{
|
||||
if (cells == 1) {
|
||||
u32 tmp;
|
||||
|
||||
if (value > U32_MAX)
|
||||
return -EINVAL;
|
||||
|
||||
tmp = cpu_to_be32(value);
|
||||
memcpy(p, &tmp, sizeof(tmp));
|
||||
} else if (cells == 2) {
|
||||
u64 tmp;
|
||||
|
||||
tmp = cpu_to_be64(value);
|
||||
memcpy(p, &tmp, sizeof(tmp));
|
||||
} else
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* 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, addr_cells, size_cells, entry_size;
|
||||
u8 value[16];
|
||||
|
||||
if (!image->ima_buffer_size)
|
||||
return 0;
|
||||
|
||||
ret = get_addr_size_cells(&addr_cells, &size_cells);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
entry_size = 4 * (addr_cells + size_cells);
|
||||
|
||||
if (entry_size > sizeof(value))
|
||||
return -EINVAL;
|
||||
|
||||
ret = write_number(value, image->ima_buffer_addr, addr_cells);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
|
||||
size_cells);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
|
||||
entry_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
|
||||
*
|
||||
|
|
@ -254,6 +489,11 @@ void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
|
|||
}
|
||||
|
||||
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) {
|
||||
|
|
|
|||
|
|
@ -565,6 +565,8 @@ 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);
|
||||
int ima_get_kexec_buffer(void **addr, size_t *size);
|
||||
int ima_free_kexec_buffer(void);
|
||||
#else /* CONFIG_OF */
|
||||
|
||||
static inline void of_core_init(void)
|
||||
|
|
|
|||
|
|
@ -24,10 +24,6 @@
|
|||
|
||||
#include "../integrity.h"
|
||||
|
||||
#ifdef CONFIG_HAVE_IMA_KEXEC
|
||||
#include <asm/ima.h>
|
||||
#endif
|
||||
|
||||
enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
|
||||
IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
|
||||
enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 };
|
||||
|
|
|
|||
|
|
@ -10,6 +10,7 @@
|
|||
#include <linux/seq_file.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/kexec.h>
|
||||
#include <linux/of.h>
|
||||
#include "ima.h"
|
||||
|
||||
#ifdef CONFIG_IMA_KEXEC
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче