726 lines
20 KiB
C
726 lines
20 KiB
C
#include <stdint.h>
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#include <stddef.h>
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#include <lib/misc.h>
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#include <sys/cpu.h>
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#include <lib/libc.h>
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#include <lib/elf.h>
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#include <lib/print.h>
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#include <lib/rand.h>
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#include <lib/elsewhere.h>
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#include <mm/pmm.h>
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#include <fs/file.h>
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#define PT_LOAD 0x00000001
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#define PT_DYNAMIC 0x00000002
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#define PT_INTERP 0x00000003
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#define PT_PHDR 0x00000006
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#define DT_NULL 0x00000000
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#define DT_NEEDED 0x00000001
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#define DT_RELA 0x00000007
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#define DT_RELASZ 0x00000008
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#define DT_RELAENT 0x00000009
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#define ABI_SYSV 0x00
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#define ARCH_X86_64 0x3e
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#define ARCH_X86_32 0x03
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#define ARCH_AARCH64 0xb7
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#define BITS_LE 0x01
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#define ET_DYN 0x0003
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#define SHT_RELA 0x00000004
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#define R_X86_64_RELATIVE 0x00000008
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#define R_AARCH64_RELATIVE 0x00000403
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/* Indices into identification array */
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#define EI_CLASS 4
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#define EI_DATA 5
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#define EI_VERSION 6
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#define EI_OSABI 7
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struct elf32_hdr {
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uint8_t ident[16];
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uint16_t type;
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uint16_t machine;
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uint32_t version;
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uint32_t entry;
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uint32_t phoff;
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uint32_t shoff;
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uint32_t flags;
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uint16_t hdr_size;
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uint16_t phdr_size;
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uint16_t ph_num;
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uint16_t shdr_size;
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uint16_t sh_num;
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uint16_t shstrndx;
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};
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struct elf64_phdr {
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uint32_t p_type;
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uint32_t p_flags;
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uint64_t p_offset;
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uint64_t p_vaddr;
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uint64_t p_paddr;
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uint64_t p_filesz;
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uint64_t p_memsz;
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uint64_t p_align;
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};
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struct elf32_phdr {
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uint32_t p_type;
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uint32_t p_offset;
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uint32_t p_vaddr;
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uint32_t p_paddr;
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uint32_t p_filesz;
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uint32_t p_memsz;
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uint32_t p_flags;
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uint32_t p_align;
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};
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struct elf32_shdr {
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uint32_t sh_name;
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uint32_t sh_type;
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uint32_t sh_flags;
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uint32_t sh_addr;
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uint32_t sh_offset;
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uint32_t sh_size;
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uint32_t sh_link;
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uint32_t sh_info;
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uint32_t sh_addralign;
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uint32_t sh_entsize;
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};
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struct elf64_rela {
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uint64_t r_addr;
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uint32_t r_info;
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uint32_t r_symbol;
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uint64_t r_addend;
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};
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struct elf64_dyn {
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uint64_t d_tag;
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uint64_t d_un;
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};
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int elf_bits(uint8_t *elf) {
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struct elf64_hdr *hdr = (void *)elf;
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if (strncmp((char *)hdr->ident, "\177ELF", 4)) {
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printv("elf: Not a valid ELF file.\n");
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return -1;
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}
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switch (hdr->machine) {
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case ARCH_X86_64:
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case ARCH_AARCH64:
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return 64;
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case ARCH_X86_32:
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return 32;
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default:
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return -1;
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}
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}
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struct elf_section_hdr_info elf64_section_hdr_info(uint8_t *elf) {
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struct elf_section_hdr_info info = {0};
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struct elf64_hdr *hdr = (void *)elf;
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info.num = hdr->sh_num;
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info.section_entry_size = hdr->shdr_size;
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info.str_section_idx = hdr->shstrndx;
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info.section_offset = hdr->shoff;
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return info;
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}
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struct elf_section_hdr_info elf32_section_hdr_info(uint8_t *elf) {
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struct elf_section_hdr_info info = {0};
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struct elf32_hdr *hdr = (void *)elf;
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info.num = hdr->sh_num;
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info.section_entry_size = hdr->shdr_size;
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info.str_section_idx = hdr->shstrndx;
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info.section_offset = hdr->shoff;
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return info;
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}
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static bool elf64_is_relocatable(uint8_t *elf, struct elf64_hdr *hdr) {
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if (hdr->phdr_size < sizeof(struct elf64_phdr)) {
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panic(true, "elf: phdr_size < sizeof(struct elf64_phdr)");
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}
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// Find DYN segment
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for (uint16_t i = 0; i < hdr->ph_num; i++) {
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struct elf64_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
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if (phdr->p_type != PT_DYNAMIC) {
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continue;
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}
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for (uint16_t j = 0; j < phdr->p_filesz / sizeof(struct elf64_dyn); j++) {
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struct elf64_dyn *dyn = (void *)elf + (phdr->p_offset + j * sizeof(struct elf64_dyn));
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switch (dyn->d_tag) {
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case DT_RELA:
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return true;
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}
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}
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}
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return false;
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}
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static bool elf64_apply_relocations(uint8_t *elf, struct elf64_hdr *hdr, void *buffer, uint64_t vaddr, size_t size, uint64_t slide) {
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if (hdr->phdr_size < sizeof(struct elf64_phdr)) {
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panic(true, "elf: phdr_size < sizeof(struct elf64_phdr)");
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}
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// Find DYN segment
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for (uint16_t i = 0; i < hdr->ph_num; i++) {
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struct elf64_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
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if (phdr->p_type != PT_DYNAMIC)
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continue;
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uint64_t rela_offset = 0;
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uint64_t rela_size = 0;
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uint64_t rela_ent = 0;
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for (uint16_t j = 0; j < phdr->p_filesz / sizeof(struct elf64_dyn); j++) {
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struct elf64_dyn *dyn = (void *)elf + (phdr->p_offset + j * sizeof(struct elf64_dyn));
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switch (dyn->d_tag) {
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case DT_RELA:
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rela_offset = dyn->d_un;
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break;
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case DT_RELAENT:
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rela_ent = dyn->d_un;
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break;
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case DT_RELASZ:
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rela_size = dyn->d_un;
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break;
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}
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}
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if (rela_offset == 0) {
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break;
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}
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if (rela_ent != sizeof(struct elf64_rela)) {
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print("elf: Unknown sh_entsize for RELA section!\n");
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return false;
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}
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for (uint16_t j = 0; j < hdr->ph_num; j++) {
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struct elf64_phdr *_phdr = (void *)elf + (hdr->phoff + j * hdr->phdr_size);
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if (_phdr->p_vaddr <= rela_offset && _phdr->p_vaddr + _phdr->p_filesz > rela_offset) {
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rela_offset -= _phdr->p_vaddr;
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rela_offset += _phdr->p_offset;
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break;
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}
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}
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// This is a RELA header, get and apply all relocations
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for (uint64_t offset = 0; offset < rela_size; offset += rela_ent) {
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struct elf64_rela *relocation = (void *)elf + (rela_offset + offset);
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switch (relocation->r_info) {
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#if defined (__x86_64__) || defined (__i386__)
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case R_X86_64_RELATIVE:
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#elif defined (__aarch64__)
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case R_AARCH64_RELATIVE:
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#else
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#error Unknown architecture
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#endif
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{
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// Relocation is before buffer
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if (relocation->r_addr < vaddr)
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continue;
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// Relocation is after buffer
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if (vaddr + size < relocation->r_addr + 8)
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continue;
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// It's inside it, calculate where it is
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uint64_t *ptr = (uint64_t *)((uint8_t *)buffer - vaddr + relocation->r_addr);
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// Write the relocated value
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*ptr = slide + relocation->r_addend;
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break;
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}
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default: {
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print("elf: Unknown RELA type: %x\n", relocation->r_info);
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return false;
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}
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}
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}
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break;
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}
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return true;
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}
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bool elf64_load_section(uint8_t *elf, void *buffer, const char *name, size_t limit, uint64_t slide) {
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struct elf64_hdr *hdr = (void *)elf;
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if (strncmp((char *)hdr->ident, "\177ELF", 4)) {
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printv("elf: Not a valid ELF file.\n");
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return false;
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}
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if (hdr->ident[EI_DATA] != BITS_LE) {
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printv("elf: Not a Little-endian ELF file.\n");
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return false;
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}
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#if defined (__x86_64__) || defined (__i386__)
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if (hdr->machine != ARCH_X86_64) {
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printv("elf: Not an x86_64 ELF file.\n");
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return false;
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}
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#elif defined (__aarch64__)
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if (hdr->machine != ARCH_AARCH64) {
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printv("elf: Not an aarch64 ELF file.\n");
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return false;
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}
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#else
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#error Unknown architecture
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#endif
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if (hdr->shdr_size < sizeof(struct elf64_shdr)) {
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panic(true, "elf: shdr_size < sizeof(struct elf64_shdr)");
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}
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struct elf64_shdr *shstrtab = (void *)elf + (hdr->shoff + hdr->shstrndx * hdr->shdr_size);
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char *names = (void *)elf + shstrtab->sh_offset;
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for (uint16_t i = 0; i < hdr->sh_num; i++) {
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struct elf64_shdr *section = (void *)elf + (hdr->shoff + i * hdr->shdr_size);
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if (strcmp(&names[section->sh_name], name) == 0) {
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if (limit == 0) {
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*(void **)buffer = ext_mem_alloc(section->sh_size);
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buffer = *(void **)buffer;
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limit = section->sh_size;
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}
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if (section->sh_size > limit) {
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return false;
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}
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memcpy(buffer, elf + section->sh_offset, section->sh_size);
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return elf64_apply_relocations(elf, hdr, buffer, section->sh_addr, section->sh_size, slide);
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}
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}
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return false;
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}
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static uint64_t elf64_max_align(uint8_t *elf) {
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uint64_t ret = 0;
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struct elf64_hdr *hdr = (void *)elf;
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if (hdr->phdr_size < sizeof(struct elf64_phdr)) {
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panic(true, "elf: phdr_size < sizeof(struct elf64_phdr)");
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}
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for (uint16_t i = 0; i < hdr->ph_num; i++) {
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struct elf64_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
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if (phdr->p_type != PT_LOAD) {
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continue;
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}
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if (phdr->p_align > ret) {
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ret = phdr->p_align;
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}
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}
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if (ret == 0) {
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panic(true, "elf: Executable has no loadable segments");
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}
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return ret;
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}
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static void elf64_get_ranges(uint8_t *elf, uint64_t slide, struct elf_range **_ranges, uint64_t *_ranges_count) {
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struct elf64_hdr *hdr = (void *)elf;
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uint64_t ranges_count = 0;
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if (hdr->phdr_size < sizeof(struct elf64_phdr)) {
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panic(true, "elf: phdr_size < sizeof(struct elf64_phdr)");
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}
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for (uint16_t i = 0; i < hdr->ph_num; i++) {
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struct elf64_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
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if (phdr->p_type != PT_LOAD) {
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continue;
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}
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if (phdr->p_vaddr < FIXED_HIGHER_HALF_OFFSET_64) {
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continue;
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}
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ranges_count++;
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}
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if (ranges_count == 0) {
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panic(true, "elf: No higher half PHDRs exist");
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}
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struct elf_range *ranges = ext_mem_alloc(ranges_count * sizeof(struct elf_range));
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size_t r = 0;
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for (uint16_t i = 0; i < hdr->ph_num; i++) {
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struct elf64_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
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if (phdr->p_type != PT_LOAD) {
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continue;
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}
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if (phdr->p_vaddr < FIXED_HIGHER_HALF_OFFSET_64) {
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continue;
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}
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uint64_t load_addr = phdr->p_vaddr + slide;
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uint64_t this_top = load_addr + phdr->p_memsz;
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ranges[r].base = load_addr & ~(phdr->p_align - 1);
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ranges[r].length = ALIGN_UP(this_top - ranges[r].base, phdr->p_align);
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ranges[r].permissions = phdr->p_flags & 0b111;
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r++;
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}
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*_ranges_count = ranges_count;
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*_ranges = ranges;
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}
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bool elf64_load(uint8_t *elf, uint64_t *entry_point, uint64_t *_slide, uint32_t alloc_type, bool kaslr, struct elf_range **ranges, uint64_t *ranges_count, uint64_t *physical_base, uint64_t *virtual_base, uint64_t *_image_size, bool *is_reloc) {
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struct elf64_hdr *hdr = (void *)elf;
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if (strncmp((char *)hdr->ident, "\177ELF", 4)) {
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printv("elf: Not a valid ELF file.\n");
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return false;
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}
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if (hdr->ident[EI_DATA] != BITS_LE) {
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panic(true, "elf: Not a Little-endian ELF file.\n");
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}
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#if defined (__x86_64__) || defined (__i386__)
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if (hdr->machine != ARCH_X86_64) {
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panic(true, "elf: Not an x86_64 ELF file.\n");
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}
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#elif defined (__aarch64__)
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if (hdr->machine != ARCH_AARCH64) {
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panic(true, "elf: Not an aarch64 ELF file.\n");
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}
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#else
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#error Unknown architecture
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#endif
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if (is_reloc) {
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*is_reloc = false;
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}
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uint64_t slide = 0;
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size_t try_count = 0;
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size_t max_simulated_tries = 0x10000;
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uint64_t entry = hdr->entry;
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uint64_t max_align = elf64_max_align(elf);
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uint64_t image_size = 0;
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if (hdr->phdr_size < sizeof(struct elf64_phdr)) {
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panic(true, "elf: phdr_size < sizeof(struct elf64_phdr)");
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}
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uint64_t min_vaddr = (uint64_t)-1;
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uint64_t max_vaddr = 0;
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for (uint16_t i = 0; i < hdr->ph_num; i++) {
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struct elf64_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
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if (phdr->p_type != PT_LOAD) {
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continue;
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}
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// Drop entries not in the higher half
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if (phdr->p_vaddr < FIXED_HIGHER_HALF_OFFSET_64) {
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continue;
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}
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// check for overlapping phdrs
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for (uint16_t j = 0; j < hdr->ph_num; j++) {
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struct elf64_phdr *phdr_in = (void *)elf + (hdr->phoff + j * hdr->phdr_size);
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if (phdr_in->p_type != PT_LOAD) {
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continue;
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}
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// Drop entries not in the higher half
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if (phdr_in->p_vaddr < FIXED_HIGHER_HALF_OFFSET_64) {
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continue;
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}
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if (phdr_in == phdr) {
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continue;
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}
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if ((phdr_in->p_vaddr >= phdr->p_vaddr
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&& phdr_in->p_vaddr < phdr->p_vaddr + phdr->p_memsz)
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||
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(phdr_in->p_vaddr + phdr_in->p_memsz > phdr->p_vaddr
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&& phdr_in->p_vaddr + phdr_in->p_memsz <= phdr->p_vaddr + phdr->p_memsz)) {
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panic(true, "elf: Attempted to load ELF file with overlapping PHDRs (%u and %u overlap)", i, j);
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}
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}
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if (phdr->p_vaddr < min_vaddr) {
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min_vaddr = phdr->p_vaddr;
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}
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if (phdr->p_vaddr + phdr->p_memsz > max_vaddr) {
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max_vaddr = phdr->p_vaddr + phdr->p_memsz;
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}
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}
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if (max_vaddr == 0 || min_vaddr == (uint64_t)-1) {
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panic(true, "elf: No higher half PHDRs exist");
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}
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image_size = max_vaddr - min_vaddr;
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*physical_base = (uintptr_t)ext_mem_alloc_type_aligned(image_size, alloc_type, max_align);
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*virtual_base = min_vaddr;
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if (_image_size) {
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*_image_size = image_size;
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}
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if (elf64_is_relocatable(elf, hdr)) {
|
|
if (is_reloc) {
|
|
*is_reloc = true;
|
|
}
|
|
}
|
|
|
|
again:
|
|
if (*is_reloc && kaslr) {
|
|
slide = rand32() & ~(max_align - 1);
|
|
|
|
if ((*virtual_base - FIXED_HIGHER_HALF_OFFSET_64) + slide + image_size >= 0x80000000) {
|
|
if (++try_count == max_simulated_tries) {
|
|
panic(true, "elf: Image wants to load too high");
|
|
}
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
for (uint16_t i = 0; i < hdr->ph_num; i++) {
|
|
struct elf64_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
|
|
|
|
if (phdr->p_type != PT_LOAD) {
|
|
continue;
|
|
}
|
|
|
|
// Drop entries not in the higher half
|
|
if (phdr->p_vaddr < FIXED_HIGHER_HALF_OFFSET_64) {
|
|
continue;
|
|
}
|
|
|
|
// Sanity checks
|
|
if (phdr->p_filesz > phdr->p_memsz) {
|
|
panic(true, "elf: p_filesz > p_memsz");
|
|
}
|
|
|
|
uint64_t load_addr = *physical_base + (phdr->p_vaddr - *virtual_base);
|
|
|
|
#if defined (__aarch64__)
|
|
uint64_t this_top = load_addr + phdr->p_memsz;
|
|
|
|
uint64_t mem_base, mem_size;
|
|
|
|
mem_base = load_addr & ~(phdr->p_align - 1);
|
|
mem_size = this_top - mem_base;
|
|
#endif
|
|
|
|
memcpy((void *)(uintptr_t)load_addr, elf + (phdr->p_offset), phdr->p_filesz);
|
|
|
|
if (!elf64_apply_relocations(elf, hdr, (void *)(uintptr_t)load_addr, phdr->p_vaddr, phdr->p_memsz, slide)) {
|
|
panic(true, "elf: Failed to apply relocations");
|
|
}
|
|
|
|
#if defined (__aarch64__)
|
|
clean_inval_dcache_poc(mem_base, mem_base + mem_size);
|
|
inval_icache_pou(mem_base, mem_base + mem_size);
|
|
#endif
|
|
}
|
|
|
|
*virtual_base += slide;
|
|
*entry_point = entry + slide;
|
|
if (_slide) {
|
|
*_slide = slide;
|
|
}
|
|
|
|
if (ranges_count != NULL && ranges != NULL) {
|
|
elf64_get_ranges(elf, slide, ranges, ranges_count);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool elf32_load_elsewhere(uint8_t *elf, uint64_t *entry_point,
|
|
struct elsewhere_range **ranges,
|
|
uint64_t *ranges_count) {
|
|
struct elf32_hdr *hdr = (void *)elf;
|
|
|
|
if (strncmp((char *)hdr->ident, "\177ELF", 4)) {
|
|
printv("elf: Not a valid ELF file.\n");
|
|
return false;
|
|
}
|
|
|
|
if (hdr->ident[EI_DATA] != BITS_LE) {
|
|
printv("elf: Not a Little-endian ELF file.\n");
|
|
return false;
|
|
}
|
|
|
|
if (hdr->machine != ARCH_X86_32) {
|
|
printv("elf: Not an x86_32 ELF file.\n");
|
|
return false;
|
|
}
|
|
|
|
*entry_point = hdr->entry;
|
|
bool entry_adjusted = false;
|
|
|
|
if (hdr->phdr_size < sizeof(struct elf32_phdr)) {
|
|
panic(true, "elf: phdr_size < sizeof(struct elf32_phdr)");
|
|
}
|
|
|
|
*ranges_count = 0;
|
|
for (uint16_t i = 0; i < hdr->ph_num; i++) {
|
|
struct elf32_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
|
|
|
|
if (phdr->p_type != PT_LOAD)
|
|
continue;
|
|
|
|
*ranges_count += 1;
|
|
}
|
|
|
|
*ranges = ext_mem_alloc(sizeof(struct elsewhere_range) * *ranges_count);
|
|
|
|
size_t cur_entry = 0;
|
|
|
|
for (uint16_t i = 0; i < hdr->ph_num; i++) {
|
|
struct elf32_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
|
|
|
|
if (phdr->p_type != PT_LOAD)
|
|
continue;
|
|
|
|
// Sanity checks
|
|
if (phdr->p_filesz > phdr->p_memsz) {
|
|
panic(true, "elf: p_filesz > p_memsz");
|
|
}
|
|
|
|
void *elsewhere = ext_mem_alloc(phdr->p_memsz);
|
|
|
|
memcpy(elsewhere, elf + phdr->p_offset, phdr->p_filesz);
|
|
|
|
if (!entry_adjusted
|
|
&& *entry_point >= phdr->p_vaddr
|
|
&& *entry_point < (phdr->p_vaddr + phdr->p_memsz)) {
|
|
*entry_point -= phdr->p_vaddr;
|
|
*entry_point += phdr->p_paddr;
|
|
entry_adjusted = true;
|
|
}
|
|
|
|
(*ranges)[cur_entry].elsewhere = (uintptr_t)elsewhere;
|
|
(*ranges)[cur_entry].target = phdr->p_paddr;
|
|
(*ranges)[cur_entry].length = phdr->p_memsz;
|
|
|
|
cur_entry++;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool elf64_load_elsewhere(uint8_t *elf, uint64_t *entry_point,
|
|
struct elsewhere_range **ranges,
|
|
uint64_t *ranges_count) {
|
|
struct elf64_hdr *hdr = (void *)elf;
|
|
|
|
if (strncmp((char *)hdr->ident, "\177ELF", 4)) {
|
|
printv("elf: Not a valid ELF file.\n");
|
|
return false;
|
|
}
|
|
|
|
if (hdr->ident[EI_DATA] != BITS_LE) {
|
|
printv("elf: Not a Little-endian ELF file.\n");
|
|
return false;
|
|
}
|
|
|
|
if (hdr->machine != ARCH_X86_64) {
|
|
printv("elf: Not an x86_64 ELF file.\n");
|
|
return false;
|
|
}
|
|
|
|
*entry_point = hdr->entry;
|
|
bool entry_adjusted = false;
|
|
|
|
if (hdr->phdr_size < sizeof(struct elf64_phdr)) {
|
|
panic(true, "elf: phdr_size < sizeof(struct elf64_phdr)");
|
|
}
|
|
|
|
*ranges_count = 0;
|
|
for (uint16_t i = 0; i < hdr->ph_num; i++) {
|
|
struct elf64_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
|
|
|
|
if (phdr->p_type != PT_LOAD)
|
|
continue;
|
|
|
|
*ranges_count += 1;
|
|
}
|
|
|
|
*ranges = ext_mem_alloc(sizeof(struct elsewhere_range) * *ranges_count);
|
|
|
|
size_t cur_entry = 0;
|
|
|
|
for (uint16_t i = 0; i < hdr->ph_num; i++) {
|
|
struct elf64_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
|
|
|
|
if (phdr->p_type != PT_LOAD)
|
|
continue;
|
|
|
|
// Sanity checks
|
|
if (phdr->p_filesz > phdr->p_memsz) {
|
|
panic(true, "elf: p_filesz > p_memsz");
|
|
}
|
|
|
|
void *elsewhere = ext_mem_alloc(phdr->p_memsz);
|
|
|
|
memcpy(elsewhere, elf + phdr->p_offset, phdr->p_filesz);
|
|
|
|
if (!entry_adjusted
|
|
&& *entry_point >= phdr->p_vaddr
|
|
&& *entry_point < (phdr->p_vaddr + phdr->p_memsz)) {
|
|
*entry_point -= phdr->p_vaddr;
|
|
*entry_point += phdr->p_paddr;
|
|
entry_adjusted = true;
|
|
}
|
|
|
|
(*ranges)[cur_entry].elsewhere = (uintptr_t)elsewhere;
|
|
(*ranges)[cur_entry].target = phdr->p_paddr;
|
|
(*ranges)[cur_entry].length = phdr->p_memsz;
|
|
|
|
cur_entry++;
|
|
}
|
|
|
|
return true;
|
|
}
|