324 lines
7.5 KiB
C
324 lines
7.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* s390 code for kexec_file_load system call
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*
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* Copyright IBM Corp. 2018
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*
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* Author(s): Philipp Rudo <prudo@linux.vnet.ibm.com>
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*/
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#include <linux/elf.h>
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#include <linux/errno.h>
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#include <linux/kexec.h>
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#include <linux/module_signature.h>
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#include <linux/verification.h>
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#include <asm/boot_data.h>
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#include <asm/ipl.h>
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#include <asm/setup.h>
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const struct kexec_file_ops * const kexec_file_loaders[] = {
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&s390_kexec_elf_ops,
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&s390_kexec_image_ops,
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NULL,
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};
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#ifdef CONFIG_KEXEC_SIG
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int s390_verify_sig(const char *kernel, unsigned long kernel_len)
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{
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const unsigned long marker_len = sizeof(MODULE_SIG_STRING) - 1;
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struct module_signature *ms;
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unsigned long sig_len;
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/* Skip signature verification when not secure IPLed. */
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if (!ipl_secure_flag)
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return 0;
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if (marker_len > kernel_len)
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return -EKEYREJECTED;
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if (memcmp(kernel + kernel_len - marker_len, MODULE_SIG_STRING,
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marker_len))
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return -EKEYREJECTED;
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kernel_len -= marker_len;
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ms = (void *)kernel + kernel_len - sizeof(*ms);
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kernel_len -= sizeof(*ms);
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sig_len = be32_to_cpu(ms->sig_len);
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if (sig_len >= kernel_len)
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return -EKEYREJECTED;
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kernel_len -= sig_len;
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if (ms->id_type != PKEY_ID_PKCS7)
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return -EKEYREJECTED;
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if (ms->algo != 0 ||
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ms->hash != 0 ||
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ms->signer_len != 0 ||
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ms->key_id_len != 0 ||
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ms->__pad[0] != 0 ||
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ms->__pad[1] != 0 ||
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ms->__pad[2] != 0) {
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return -EBADMSG;
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}
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return verify_pkcs7_signature(kernel, kernel_len,
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kernel + kernel_len, sig_len,
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VERIFY_USE_PLATFORM_KEYRING,
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VERIFYING_MODULE_SIGNATURE,
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NULL, NULL);
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}
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#endif /* CONFIG_KEXEC_SIG */
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static int kexec_file_update_purgatory(struct kimage *image,
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struct s390_load_data *data)
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{
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u64 entry, type;
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int ret;
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if (image->type == KEXEC_TYPE_CRASH) {
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entry = STARTUP_KDUMP_OFFSET;
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type = KEXEC_TYPE_CRASH;
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} else {
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entry = STARTUP_NORMAL_OFFSET;
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type = KEXEC_TYPE_DEFAULT;
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}
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ret = kexec_purgatory_get_set_symbol(image, "kernel_entry", &entry,
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sizeof(entry), false);
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if (ret)
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return ret;
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ret = kexec_purgatory_get_set_symbol(image, "kernel_type", &type,
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sizeof(type), false);
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if (ret)
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return ret;
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if (image->type == KEXEC_TYPE_CRASH) {
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u64 crash_size;
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ret = kexec_purgatory_get_set_symbol(image, "crash_start",
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&crashk_res.start,
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sizeof(crashk_res.start),
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false);
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if (ret)
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return ret;
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crash_size = crashk_res.end - crashk_res.start + 1;
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ret = kexec_purgatory_get_set_symbol(image, "crash_size",
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&crash_size,
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sizeof(crash_size),
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false);
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}
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return ret;
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}
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static int kexec_file_add_purgatory(struct kimage *image,
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struct s390_load_data *data)
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{
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struct kexec_buf buf;
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int ret;
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buf.image = image;
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data->memsz = ALIGN(data->memsz, PAGE_SIZE);
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buf.mem = data->memsz;
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if (image->type == KEXEC_TYPE_CRASH)
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buf.mem += crashk_res.start;
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ret = kexec_load_purgatory(image, &buf);
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if (ret)
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return ret;
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data->memsz += buf.memsz;
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return kexec_file_update_purgatory(image, data);
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}
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static int kexec_file_add_initrd(struct kimage *image,
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struct s390_load_data *data)
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{
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struct kexec_buf buf;
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int ret;
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buf.image = image;
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buf.buffer = image->initrd_buf;
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buf.bufsz = image->initrd_buf_len;
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data->memsz = ALIGN(data->memsz, PAGE_SIZE);
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buf.mem = data->memsz;
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if (image->type == KEXEC_TYPE_CRASH)
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buf.mem += crashk_res.start;
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buf.memsz = buf.bufsz;
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data->parm->initrd_start = buf.mem;
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data->parm->initrd_size = buf.memsz;
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data->memsz += buf.memsz;
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ret = kexec_add_buffer(&buf);
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if (ret)
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return ret;
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return ipl_report_add_component(data->report, &buf, 0, 0);
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}
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static int kexec_file_add_ipl_report(struct kimage *image,
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struct s390_load_data *data)
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{
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__u32 *lc_ipl_parmblock_ptr;
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unsigned int len, ncerts;
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struct kexec_buf buf;
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unsigned long addr;
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void *ptr, *end;
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buf.image = image;
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data->memsz = ALIGN(data->memsz, PAGE_SIZE);
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buf.mem = data->memsz;
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if (image->type == KEXEC_TYPE_CRASH)
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buf.mem += crashk_res.start;
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ptr = (void *)ipl_cert_list_addr;
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end = ptr + ipl_cert_list_size;
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ncerts = 0;
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while (ptr < end) {
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ncerts++;
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len = *(unsigned int *)ptr;
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ptr += sizeof(len);
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ptr += len;
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}
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addr = data->memsz + data->report->size;
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addr += ncerts * sizeof(struct ipl_rb_certificate_entry);
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ptr = (void *)ipl_cert_list_addr;
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while (ptr < end) {
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len = *(unsigned int *)ptr;
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ptr += sizeof(len);
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ipl_report_add_certificate(data->report, ptr, addr, len);
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addr += len;
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ptr += len;
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}
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buf.buffer = ipl_report_finish(data->report);
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buf.bufsz = data->report->size;
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buf.memsz = buf.bufsz;
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data->memsz += buf.memsz;
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lc_ipl_parmblock_ptr =
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data->kernel_buf + offsetof(struct lowcore, ipl_parmblock_ptr);
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*lc_ipl_parmblock_ptr = (__u32)buf.mem;
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return kexec_add_buffer(&buf);
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}
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void *kexec_file_add_components(struct kimage *image,
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int (*add_kernel)(struct kimage *image,
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struct s390_load_data *data))
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{
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struct s390_load_data data = {0};
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int ret;
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data.report = ipl_report_init(&ipl_block);
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if (IS_ERR(data.report))
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return data.report;
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ret = add_kernel(image, &data);
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if (ret)
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goto out;
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if (image->cmdline_buf_len >= ARCH_COMMAND_LINE_SIZE) {
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ret = -EINVAL;
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goto out;
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}
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memcpy(data.parm->command_line, image->cmdline_buf,
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image->cmdline_buf_len);
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if (image->type == KEXEC_TYPE_CRASH) {
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data.parm->oldmem_base = crashk_res.start;
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data.parm->oldmem_size = crashk_res.end - crashk_res.start + 1;
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}
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if (image->initrd_buf) {
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ret = kexec_file_add_initrd(image, &data);
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if (ret)
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goto out;
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}
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ret = kexec_file_add_purgatory(image, &data);
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if (ret)
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goto out;
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if (data.kernel_mem == 0) {
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unsigned long restart_psw = 0x0008000080000000UL;
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restart_psw += image->start;
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memcpy(data.kernel_buf, &restart_psw, sizeof(restart_psw));
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image->start = 0;
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}
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ret = kexec_file_add_ipl_report(image, &data);
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out:
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ipl_report_free(data.report);
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return ERR_PTR(ret);
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}
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int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
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Elf_Shdr *section,
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const Elf_Shdr *relsec,
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const Elf_Shdr *symtab)
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{
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Elf_Rela *relas;
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int i, r_type;
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relas = (void *)pi->ehdr + relsec->sh_offset;
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for (i = 0; i < relsec->sh_size / sizeof(*relas); i++) {
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const Elf_Sym *sym; /* symbol to relocate */
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unsigned long addr; /* final location after relocation */
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unsigned long val; /* relocated symbol value */
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void *loc; /* tmp location to modify */
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sym = (void *)pi->ehdr + symtab->sh_offset;
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sym += ELF64_R_SYM(relas[i].r_info);
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if (sym->st_shndx == SHN_UNDEF)
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return -ENOEXEC;
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if (sym->st_shndx == SHN_COMMON)
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return -ENOEXEC;
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if (sym->st_shndx >= pi->ehdr->e_shnum &&
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sym->st_shndx != SHN_ABS)
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return -ENOEXEC;
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loc = pi->purgatory_buf;
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loc += section->sh_offset;
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loc += relas[i].r_offset;
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val = sym->st_value;
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if (sym->st_shndx != SHN_ABS)
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val += pi->sechdrs[sym->st_shndx].sh_addr;
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val += relas[i].r_addend;
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addr = section->sh_addr + relas[i].r_offset;
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r_type = ELF64_R_TYPE(relas[i].r_info);
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arch_kexec_do_relocs(r_type, loc, val, addr);
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}
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return 0;
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}
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int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
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unsigned long buf_len)
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{
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/* A kernel must be at least large enough to contain head.S. During
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* load memory in head.S will be accessed, e.g. to register the next
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* command line. If the next kernel were smaller the current kernel
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* will panic at load.
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*/
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if (buf_len < HEAD_END)
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return -ENOEXEC;
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return kexec_image_probe_default(image, buf, buf_len);
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}
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