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ro: add support for applying ips patches to NROs.

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This commit is contained in:
Michael Scire 2019-04-22 04:32:15 -07:00
parent f50bfaf7d7
commit a1d4caa7b4
5 changed files with 266 additions and 29 deletions
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188
stratosphere/ro/source/ro_patcher.cpp Normal file
View file

@ -0,0 +1,188 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <cstdlib>
#include <cstdint>
#include <cstdio>
#include <cstring>
#include <dirent.h>
#include <ctype.h>
#include <switch.h>
#include "ro_patcher.hpp"
#include "ro_registration.hpp"
/* IPS Patching adapted from Luma3DS (https://github.com/AuroraWright/Luma3DS/blob/master/sysmodules/loader/source/patcher.c) */
#define IPS_MAGIC "PATCH"
#define IPS_TAIL "EOF"
#define IPS32_MAGIC "IPS32"
#define IPS32_TAIL "EEOF"
static inline u8 HexNybbleToU8(const char nybble) {
if ('0' <= nybble && nybble <= '9') {
return nybble - '0';
} else if ('a' <= nybble && nybble <= 'f') {
return nybble - 'a' + 0xa;
} else {
return nybble - 'A' + 0xA;
}
}
static bool MatchesBuildId(const char *name, size_t name_len, const u8 *build_id) {
/* Validate name is hex build id. */
for (unsigned int i = 0; i < name_len - 4; i++) {
if (isxdigit(name[i]) == 0) {
return false;
}
}
/* Read build id from name. */
u8 build_id_from_name[0x20] = {0};
for (unsigned int name_ofs = 0, id_ofs = 0; name_ofs < name_len - 4; id_ofs++) {
build_id_from_name[id_ofs] |= HexNybbleToU8(name[name_ofs++]) << 4;
build_id_from_name[id_ofs] |= HexNybbleToU8(name[name_ofs++]);
}
return memcmp(build_id, build_id_from_name, sizeof(build_id_from_name)) == 0;
}
static void ApplyIpsPatch(u8 *mapped_nro, size_t mapped_size, bool is_ips32, FILE *f_ips) {
u8 buffer[4];
while (fread(buffer, is_ips32 ? 4 : 3, 1, f_ips) == 1) {
if (is_ips32 && memcmp(buffer, IPS32_TAIL, 4) == 0) {
break;
} else if (!is_ips32 && memcmp(buffer, IPS_TAIL, 3) == 0) {
break;
}
/* Offset of patch. */
u32 patch_offset;
if (is_ips32) {
patch_offset = (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3];
} else {
patch_offset = (buffer[0] << 16) | (buffer[1] << 8) | (buffer[2]);
}
/* Size of patch. */
if (fread(buffer, 2, 1, f_ips) != 1) {
break;
}
u32 patch_size = (buffer[0] << 8) | (buffer[1]);
/* Check for RLE encoding. */
if (patch_size == 0) {
/* Size of RLE. */
if (fread(buffer, 2, 1, f_ips) != 1) {
break;
}
u32 rle_size = (buffer[0] << 8) | (buffer[1]);
/* Value for RLE. */
if (fread(buffer, 1, 1, f_ips) != 1) {
break;
}
if (patch_offset < sizeof(Registration::NroHeader)) {
if (patch_offset + rle_size > sizeof(Registration::NroHeader)) {
u32 diff = sizeof(Registration::NroHeader) - patch_offset;
patch_offset += diff;
rle_size -= diff;
goto IPS_RLE_PATCH_OFFSET_WITHIN_BOUNDS;
}
} else {
IPS_RLE_PATCH_OFFSET_WITHIN_BOUNDS:
patch_offset -= sizeof(Registration::NroHeader);
if (patch_offset + rle_size > mapped_size) {
rle_size = mapped_size - patch_offset;
}
memset(mapped_nro + patch_offset, buffer[0], rle_size);
}
} else {
if (patch_offset < sizeof(Registration::NroHeader)) {
if (patch_offset + patch_size > sizeof(Registration::NroHeader)) {
u32 diff = sizeof(Registration::NroHeader) - patch_offset;
patch_offset += diff;
patch_size -= diff;
fseek(f_ips, diff, SEEK_CUR);
goto IPS_DATA_PATCH_OFFSET_WITHIN_BOUNDS;
} else {
fseek(f_ips, patch_size, SEEK_CUR);
}
} else {
IPS_DATA_PATCH_OFFSET_WITHIN_BOUNDS:
patch_offset -= sizeof(Registration::NroHeader);
u32 read_size = patch_size;
if (patch_offset + read_size > mapped_size) {
read_size = mapped_size - patch_offset;
}
if (fread(mapped_nro + patch_offset, read_size, 1, f_ips) != 1) {
break;
}
if (patch_size > read_size) {
fseek(f_ips, patch_size - read_size, SEEK_CUR);
}
}
}
}
}
void PatchUtils::ApplyPatches(const ModuleId *module_id, u8 *mapped_nro, size_t mapped_size) {
/* Inspect all patches from /atmosphere/nro_patches/<*>/<*>.ips */
char path[FS_MAX_PATH+1] = {0};
snprintf(path, sizeof(path) - 1, "sdmc:/atmosphere/nro_patches");
DIR *patches_dir = opendir(path);
struct dirent *pdir_ent;
if (patches_dir != NULL) {
/* Iterate over the patches directory to find patch subdirectories. */
while ((pdir_ent = readdir(patches_dir)) != NULL) {
if (strcmp(pdir_ent->d_name, ".") == 0 || strcmp(pdir_ent->d_name, "..") == 0) {
continue;
}
snprintf(path, sizeof(path) - 1, "sdmc:/atmosphere/nro_patches/%s", pdir_ent->d_name);
DIR *patch_dir = opendir(path);
struct dirent *ent;
if (patch_dir != NULL) {
/* Iterate over the patch subdirectory to find .ips patches. */
while ((ent = readdir(patch_dir)) != NULL) {
if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) {
continue;
}
size_t name_len = strlen(ent->d_name);
if ((4 < name_len && name_len <= 0x44) && ((name_len & 1) == 0) && strcmp(ent->d_name + name_len - 4, ".ips") == 0 && MatchesBuildId(ent->d_name, name_len, module_id->build_id)) {
snprintf(path, sizeof(path) - 1, "sdmc:/atmosphere/nro_patches/%s/%s", pdir_ent->d_name, ent->d_name);
FILE *f_ips = fopen(path, "rb");
if (f_ips != NULL) {
u8 header[5];
if (fread(header, 5, 1, f_ips) == 1) {
if (memcmp(header, IPS_MAGIC, 5) == 0) {
ApplyIpsPatch(mapped_nro, mapped_size, false, f_ips);
} else if (memcmp(header, IPS32_MAGIC, 5) == 0) {
ApplyIpsPatch(mapped_nro, mapped_size, true, f_ips);
}
}
fclose(f_ips);
}
}
}
closedir(patch_dir);
}
}
closedir(patches_dir);
}
}

26
stratosphere/ro/source/ro_patcher.hpp Normal file
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@ -0,0 +1,26 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <switch.h>
#include <cstdio>
#include "ro_types.hpp"
class PatchUtils {
public:
static void ApplyPatches(const ModuleId *module_id, u8 *mapped_nro, size_t mapped_size);
};

4
stratosphere/ro/source/ro_registration.cpp
View file

@ -22,6 +22,7 @@
#include "ro_registration.hpp"
#include "ro_map.hpp"
#include "ro_nrr.hpp"
#include "ro_patcher.hpp"
/* Declare process contexts as global array. */
static Registration::RoProcessContext g_process_contexts[Registration::MaxSessions] = {};
@ -323,6 +324,9 @@ Result Registration::ValidateNro(ModuleId *out_module_id, u64 *out_rx_size, u64
}
}
/* Apply patches to NRO. */
PatchUtils::ApplyPatches(&module_id, reinterpret_cast<u8 *>(map_address), nro_size);
*out_module_id = module_id;
*out_rx_size = header->text_size;
*out_ro_size = header->ro_size;

25
stratosphere/ro/source/ro_registration.hpp
View file

@ -20,6 +20,7 @@
#include <stratosphere.hpp>
#include "ro_nrr.hpp"
#include "ro_types.hpp"
class Registration {
public:
@ -30,7 +31,6 @@ class Registration {
static constexpr u32 MagicNro0 = 0x304F524E;
public:
struct NroHeader {
u32 entrypoint_insn;
u32 mod_offset;
@ -52,29 +52,6 @@ class Registration {
};
static_assert(sizeof(NroHeader) == 0x80, "NroHeader definition!");
struct ModuleId {
u8 build_id[0x20];
};
static_assert(sizeof(ModuleId) == sizeof(LoaderModuleInfo::build_id), "ModuleId definition!");
struct Sha256Hash {
u8 hash[0x20];
bool operator==(const Sha256Hash &o) const {
return std::memcmp(this, &o, sizeof(*this)) == 0;
}
bool operator!=(const Sha256Hash &o) const {
return std::memcmp(this, &o, sizeof(*this)) != 0;
}
bool operator<(const Sha256Hash &o) const {
return std::memcmp(this, &o, sizeof(*this)) < 0;
}
bool operator>(const Sha256Hash &o) const {
return std::memcmp(this, &o, sizeof(*this)) > 0;
}
};
static_assert(sizeof(Sha256Hash) == sizeof(Sha256Hash::hash), "Sha256Hash definition!");
struct NroInfo {
u64 base_address;
u64 nro_heap_address;

42
stratosphere/ro/source/ro_types.hpp Normal file
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@ -0,0 +1,42 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <switch.h>
#include <stratosphere.hpp>
struct ModuleId {
u8 build_id[0x20];
};
static_assert(sizeof(ModuleId) == sizeof(LoaderModuleInfo::build_id), "ModuleId definition!");
struct Sha256Hash {
u8 hash[0x20];
bool operator==(const Sha256Hash &o) const {
return std::memcmp(this, &o, sizeof(*this)) == 0;
}
bool operator!=(const Sha256Hash &o) const {
return std::memcmp(this, &o, sizeof(*this)) != 0;
}
bool operator<(const Sha256Hash &o) const {
return std::memcmp(this, &o, sizeof(*this)) < 0;
}
bool operator>(const Sha256Hash &o) const {
return std::memcmp(this, &o, sizeof(*this)) > 0;
}
};
static_assert(sizeof(Sha256Hash) == sizeof(Sha256Hash::hash), "Sha256Hash definition!");