^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Kexec image loader
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2018 Linaro Limited
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #define pr_fmt(fmt) "kexec_file(Image): " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kexec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/pe.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/verification.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/byteorder.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/cpufeature.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/image.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/memory.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int image_probe(const char *kernel_buf, unsigned long kernel_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) const struct arm64_image_header *h =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) (const struct arm64_image_header *)(kernel_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) if (!h || (kernel_len < sizeof(*h)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (memcmp(&h->magic, ARM64_IMAGE_MAGIC, sizeof(h->magic)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static void *image_load(struct kimage *image,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) char *kernel, unsigned long kernel_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) char *initrd, unsigned long initrd_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) char *cmdline, unsigned long cmdline_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct arm64_image_header *h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) u64 flags, value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) bool be_image, be_kernel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct kexec_buf kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) unsigned long text_offset, kernel_segment_number;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct kexec_segment *kernel_segment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * We require a kernel with an unambiguous Image header. Per
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * Documentation/arm64/booting.rst, this is the case when image_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * is non-zero (practically speaking, since v3.17).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) h = (struct arm64_image_header *)kernel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (!h->image_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* Check cpu features */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) flags = le64_to_cpu(h->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) be_image = arm64_image_flag_field(flags, ARM64_IMAGE_FLAG_BE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) be_kernel = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) if ((be_image != be_kernel) && !system_supports_mixed_endian())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) value = arm64_image_flag_field(flags, ARM64_IMAGE_FLAG_PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (((value == ARM64_IMAGE_FLAG_PAGE_SIZE_4K) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) !system_supports_4kb_granule()) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ((value == ARM64_IMAGE_FLAG_PAGE_SIZE_64K) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) !system_supports_64kb_granule()) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) ((value == ARM64_IMAGE_FLAG_PAGE_SIZE_16K) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) !system_supports_16kb_granule()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /* Load the kernel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) kbuf.image = image;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) kbuf.buf_min = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) kbuf.buf_max = ULONG_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) kbuf.top_down = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) kbuf.buffer = kernel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) kbuf.bufsz = kernel_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) kbuf.memsz = le64_to_cpu(h->image_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) text_offset = le64_to_cpu(h->text_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) kbuf.buf_align = MIN_KIMG_ALIGN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) /* Adjust kernel segment with TEXT_OFFSET */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) kbuf.memsz += text_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) kernel_segment_number = image->nr_segments;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * The location of the kernel segment may make it impossible to satisfy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * the other segment requirements, so we try repeatedly to find a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * location that will work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) while ((ret = kexec_add_buffer(&kbuf)) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* Try to load additional data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) kernel_segment = &image->segment[kernel_segment_number];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) ret = load_other_segments(image, kernel_segment->mem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) kernel_segment->memsz, initrd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) initrd_len, cmdline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * We couldn't find space for the other segments; erase the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * kernel segment and try the next available hole.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) image->nr_segments -= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) kbuf.buf_min = kernel_segment->mem + kernel_segment->memsz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) pr_err("Could not find any suitable kernel location!");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) kernel_segment = &image->segment[kernel_segment_number];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) kernel_segment->mem += text_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) kernel_segment->memsz -= text_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) image->start = kernel_segment->mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) pr_debug("Loaded kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) kernel_segment->mem, kbuf.bufsz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) kernel_segment->memsz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static int image_verify_sig(const char *kernel, unsigned long kernel_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return verify_pefile_signature(kernel, kernel_len, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) VERIFYING_KEXEC_PE_SIGNATURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) const struct kexec_file_ops kexec_image_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .probe = image_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) .load = image_load,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) #ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) .verify_sig = image_verify_sig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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