mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-10 14:11:43 +00:00
239 lines
8.7 KiB
C++
239 lines
8.7 KiB
C++
#include <switch.h>
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#include <algorithm>
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#include <cstdio>
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#include "ldr_nso.hpp"
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#include "ldr_map.hpp"
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#include "ldr_random.hpp"
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static NsoUtils::NsoHeader g_nso_headers[NSO_NUM_MAX] = {0};
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static bool g_nso_present[NSO_NUM_MAX] = {0};
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static char g_nso_path[FS_MAX_PATH] = {0};
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FILE *NsoUtils::OpenNsoFromExeFS(unsigned int index) {
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std::fill(g_nso_path, g_nso_path + FS_MAX_PATH, 0);
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snprintf(g_nso_path, FS_MAX_PATH, "code:/%s", NsoUtils::GetNsoFileName(index));
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return fopen(g_nso_path, "rb");
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}
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FILE *NsoUtils::OpenNsoFromSdCard(unsigned int index, u64 title_id) {
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std::fill(g_nso_path, g_nso_path + FS_MAX_PATH, 0);
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snprintf(g_nso_path, FS_MAX_PATH, "sdmc:/atmosphere/titles/%016lx/exefs/%s", title_id, NsoUtils::GetNsoFileName(index));
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return fopen(g_nso_path, "rb");
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}
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FILE *NsoUtils::OpenNso(unsigned int index, u64 title_id) {
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FILE *f_out = OpenNsoFromSdCard(index, title_id);
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if (f_out != NULL) {
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return f_out;
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}
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return OpenNsoFromExeFS(index);
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}
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bool NsoUtils::IsNsoPresent(unsigned int index) {
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return g_nso_present[index];
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}
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Result NsoUtils::LoadNsoHeaders(u64 title_id) {
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FILE *f_nso;
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/* Zero out the cache. */
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std::fill(g_nso_present, g_nso_present + NSO_NUM_MAX, false);
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std::fill(g_nso_headers, g_nso_headers + NSO_NUM_MAX, (const NsoUtils::NsoHeader &){0});
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for (unsigned int i = 0; i < NSO_NUM_MAX; i++) {
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f_nso = OpenNso(i, title_id);
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if (f_nso != NULL) {
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if (fread(&g_nso_headers[i], sizeof(NsoUtils::NsoHeader), 1, f_nso) != sizeof(NsoUtils::NsoHeader)) {
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return 0xA09;
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}
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g_nso_present[i] = true;
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fclose(f_nso);
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continue;
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}
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if (1 < i && i < 12) {
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/* If we failed to open a subsdk, there are no more subsdks. */
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i = 11;
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}
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}
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return 0x0;
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}
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Result NsoUtils::ValidateNsoLoadSet() {
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/* We *must* have a "main" NSO. */
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if (!g_nso_present[1]) {
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return 0xA09;
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}
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/* Behavior switches depending on whether we have an rtld. */
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if (g_nso_present[0]) {
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/* If we have an rtld, dst offset for .text must be 0 for all other NSOs. */
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for (unsigned int i = 0; i < NSO_NUM_MAX; i++) {
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if (g_nso_present[i] && g_nso_headers[i].segments[0].dst_offset != 0) {
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return 0xA09;
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}
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}
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} else {
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/* If we don't have an rtld, we must ONLY have a main. */
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for (unsigned int i = 2; i < NSO_NUM_MAX; i++) {
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if (g_nso_present[i]) {
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return 0xA09;
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}
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}
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/* That main's .text must be at dst_offset 0. */
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if (g_nso_headers[1].segments[0].dst_offset != 0) {
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return 0xA09;
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}
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}
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return 0x0;
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}
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Result NsoUtils::CalculateNsoLoadExtents(u32 addspace_type, u32 args_size, NsoLoadExtents *extents) {
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*extents = (const NsoUtils::NsoLoadExtents){0};
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/* Calculate base offsets. */
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for (unsigned int i = 0; i < NSO_NUM_MAX; i++) {
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if (g_nso_present[i]) {
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extents->nso_addresses[i] = extents->total_size;
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u32 text_end = g_nso_headers[i].segments[0].dst_offset + g_nso_headers[i].segments[0].decomp_size;
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u32 ro_end = g_nso_headers[i].segments[1].dst_offset + g_nso_headers[i].segments[1].decomp_size;
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u32 rw_end = g_nso_headers[i].segments[2].dst_offset + g_nso_headers[i].segments[2].decomp_size + g_nso_headers[i].segments[2].align_or_total_size;
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extents->nso_sizes[i] = text_end;
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if (extents->nso_sizes[i] < ro_end) {
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extents->nso_sizes[i] = ro_end;
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}
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if (extents->nso_sizes[i] < rw_end) {
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extents->nso_sizes[i] = rw_end;
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}
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extents->nso_sizes[i] += 0xFFF;
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extents->nso_sizes[i] &= ~0xFFFULL;
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extents->total_size += extents->nso_sizes[i];
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if (args_size && !extents->args_size) {
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extents->args_address = extents->total_size;
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/* What the fuck? Where does 0x9007 come from? */
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extents->args_size = (2 * args_size + 0x9007);
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extents->args_size &= ~0xFFFULL;
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}
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}
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}
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/* Calculate ASLR extents for address space type. */
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u64 addspace_start, addspace_size;
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if (kernelAbove200()) {
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switch (addspace_type & 0xE) {
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case 0:
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case 4:
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addspace_start = 0x200000ULL;
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addspace_size = 0x3FE00000ULL;
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break;
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case 2:
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addspace_start = 0x8000000ULL;
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addspace_size = 0x78000000ULL;
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break;
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case 6:
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addspace_start = 0x8000000ULL;
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addspace_size = 0x7FF8000000ULL;
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break;
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default:
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/* TODO: Panic. */
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return 0xD001;
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}
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} else {
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if (addspace_type & 2) {
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addspace_start = 0x8000000ULL;
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addspace_size = 0x78000000ULL;
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} else {
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addspace_start = 0x200000ULL;
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addspace_size = 0x3FE00000ULL;
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}
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}
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if (extents->total_size > addspace_size) {
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return 0xD001;
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}
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u64 aslr_slide = 0;
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if (addspace_type & 0x20) {
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aslr_slide = RandomUtils::GetRandomU64((addspace_size - extents->total_size) >> 21) << 21;
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}
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extents->base_address = addspace_start + aslr_slide;
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for (unsigned int i = 0; i < NSO_NUM_MAX; i++) {
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if (g_nso_present[i]) {
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extents->nso_addresses[i] += extents->base_address;
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}
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}
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if (extents->args_address) {
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extents->args_address += extents->base_address;
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}
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return 0x0;
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}
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Result NsoUtils::LoadNsoSegment(unsigned int index, unsigned int segment, FILE *f_nso, u8 *map_base) {
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/* TODO */
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return 0xA09;
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}
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Result NsoUtils::LoadNsosIntoProcessMemory(Handle process_h, u64 title_id, NsoLoadExtents *extents, u8 *args, u32 args_size) {
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Result rc = 0xA09;
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for (unsigned int i = 0; i < NSO_NUM_MAX; i++) {
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if (g_nso_present[i]) {
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u64 map_addr = 0;
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if (R_FAILED((rc = MapUtils::LocateSpaceForMap(&map_addr, extents->nso_sizes[i])))) {
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return rc;
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}
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u8 *map_base = (u8 *)map_addr;
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if (R_FAILED((rc = svcMapProcessMemory(map_base, process_h, extents->nso_addresses[i], extents->nso_sizes[i])))) {
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return rc;
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}
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FILE *f_nso = OpenNso(i, title_id);
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if (f_nso == NULL) {
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/* Is there a better error to return here? */
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return 0xA09;
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}
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for (unsigned int seg = 0; seg < 3; seg++) {
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if (R_FAILED((rc = LoadNsoSegment(i, seg, f_nso, map_base)))) {
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fclose(f_nso);
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svcUnmapProcessMemory(map_base, process_h, extents->nso_addresses[i], extents->nso_sizes[i]);
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return rc;
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}
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}
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fclose(f_nso);
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/* Zero out memory before .text. */
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u64 text_base = 0, text_start = g_nso_headers[i].segments[0].dst_offset;
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std::fill(map_base + text_base, map_base + text_start, 0);
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/* Zero out memory before .rodata. */
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u64 ro_base = text_start + g_nso_headers[i].segments[0].decomp_size, ro_start = g_nso_headers[i].segments[1].dst_offset;
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std::fill(map_base + ro_base, map_base + ro_start, 0);
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/* Zero out memory before .rwdata. */
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u64 rw_base = ro_start + g_nso_headers[i].segments[1].decomp_size, rw_start = g_nso_headers[i].segments[2].dst_offset;
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std::fill(map_base + rw_base, map_base + rw_start, 0);
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/* Zero out .bss. */
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u64 bss_base = rw_base + g_nso_headers[i].segments[2].decomp_size, bss_size = g_nso_headers[i].segments[2].align_or_total_size;
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std::fill(map_base + bss_base, map_base + bss_base + bss_size, 0);
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if (R_FAILED((rc = svcUnmapProcessMemory(map_base, process_h, extents->nso_addresses[i], extents->nso_sizes[i])))) {
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return rc;
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}
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for (unsigned int seg = 0; seg < 3; seg++) {
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u64 size = g_nso_headers[i].segments[seg].decomp_size;
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size += 0xFFF;
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size &= ~0xFFFULL;
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const static unsigned int segment_perms[3] = {5, 1, 3};
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if (R_FAILED((rc = svcSetProcessMemoryPermission(process_h, extents->nso_addresses[i] + g_nso_headers[i].segments[seg].dst_offset, size, segment_perms[seg])))) {
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return rc;
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}
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}
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}
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}
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/* TODO: Map in arguments, here. */
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return rc;
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}
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