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Code Issues Releases Activity

fusee: Fix IPS patching for KIPs. (closes #3).

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This commit is contained in:
Michael Scire 2018-10-16 17:21:08 -07:00
parent 472059134a
commit 2f29bcef3a
2 changed files with 69 additions and 20 deletions
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84
fusee/fusee-secondary/src/ips.c
View file

@ -22,6 +22,7 @@
#include <ctype.h>
#include "utils.h"
#include "se.h"
#include "lib/log.h"
#include "ips.h"
/* IPS Patching adapted from Luma3DS (https://github.com/AuroraWright/Luma3DS/blob/master/sysmodules/loader/source/patcher.c) */
@ -79,13 +80,13 @@ static void apply_ips_patch(uint8_t *mem, size_t mem_size, size_t prot_size, boo
}
} else {
IPS_RLE_PATCH_OFFSET_WITHIN_BOUNDS:
patch_offset -= prot_size;
if (patch_offset + rle_size > mem_size) {
rle_size = mem_size - patch_offset;
}
memset(mem + patch_offset, buffer[0], rle_size);
}
} else {
uint32_t read_size;
if (patch_offset < prot_size) {
if (patch_offset + patch_size > prot_size) {
uint32_t diff = prot_size - patch_offset;
@ -98,8 +99,7 @@ static void apply_ips_patch(uint8_t *mem, size_t mem_size, size_t prot_size, boo
}
} else {
IPS_DATA_PATCH_OFFSET_WITHIN_BOUNDS:
patch_offset -= prot_size;
uint32_t read_size = patch_size;
read_size = patch_size;
if (patch_offset + read_size > mem_size) {
read_size = mem_size - patch_offset;
}
@ -144,8 +144,52 @@ static bool name_matches_hash(const char *name, size_t name_len, const void *has
}
static bool apply_ips_patches(const char *dir, void *mem, size_t mem_size, size_t prot_size, const void *hash, size_t hash_size) {
static bool has_ips_patches(const char *dir, const void *hash, size_t hash_size) {
bool any_patches = false;
char path[0x301] = {0};
snprintf(path, sizeof(path) - 1, "%s", dir);
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 && !any_patches) {
if (strcmp(pdir_ent->d_name, ".") == 0 || strcmp(pdir_ent->d_name, "..") == 0) {
continue;
}
snprintf(path, sizeof(path) - 1, "%s/%s", dir, 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 && !any_patches) {
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 && name_matches_hash(ent->d_name, name_len, hash, hash_size)) {
snprintf(path, sizeof(path) - 1, "%s/%s/%s", dir, pdir_ent->d_name, ent->d_name);
FILE *f_ips = fopen(path, "rb");
if (f_ips != NULL) {
uint8_t header[5];
if (fread(header, 5, 1, f_ips) == 1) {
if (memcmp(header, IPS_MAGIC, 5) == 0 || memcmp(header, IPS32_MAGIC, 5) == 0) {
any_patches = true;
}
}
fclose(f_ips);
}
}
}
closedir(patch_dir);
}
}
closedir(patches_dir);
}
return any_patches;
}
static void apply_ips_patches(const char *dir, void *mem, size_t mem_size, size_t prot_size, const void *hash, size_t hash_size) {
char path[0x301] = {0};
snprintf(path, sizeof(path) - 1, "%s", dir);
DIR *patches_dir = opendir(path);
@ -173,10 +217,8 @@ static bool apply_ips_patches(const char *dir, void *mem, size_t mem_size, size_
uint8_t header[5];
if (fread(header, 5, 1, f_ips) == 1) {
if (memcmp(header, IPS_MAGIC, 5) == 0) {
any_patches = true;
apply_ips_patch(mem, mem_size, prot_size, false, f_ips);
} else if (memcmp(header, IPS32_MAGIC, 5) == 0) {
any_patches = true;
apply_ips_patch(mem, mem_size, prot_size, true, f_ips);
}
}
@ -189,8 +231,6 @@ static bool apply_ips_patches(const char *dir, void *mem, size_t mem_size, size_
}
closedir(patches_dir);
}
return any_patches;
}
void apply_kernel_ips_patches(void *kernel, size_t kernel_size) {
@ -200,10 +240,11 @@ void apply_kernel_ips_patches(void *kernel, size_t kernel_size) {
}
static void kip1_blz_uncompress(void *hdr_end) {
uint32_t addl_size = ((uint32_t *)hdr_end)[-1];
uint32_t header_size = ((uint32_t *)hdr_end)[-2];
uint32_t cmp_and_hdr_size = ((uint32_t *)hdr_end)[-3];
uint8_t *u8_hdr_end = (uint8_t *)hdr_end;
uint32_t addl_size = ((u8_hdr_end[-4]) << 0) | ((u8_hdr_end[-3]) << 8) | ((u8_hdr_end[-2]) << 16) | ((u8_hdr_end[-1]) << 24);
uint32_t header_size = ((u8_hdr_end[-8]) << 0) | ((u8_hdr_end[-7]) << 8) | ((u8_hdr_end[-6]) << 16) | ((u8_hdr_end[-5]) << 24);
uint32_t cmp_and_hdr_size = ((u8_hdr_end[-12]) << 0) | ((u8_hdr_end[-11]) << 8) | ((u8_hdr_end[-10]) << 16) | ((u8_hdr_end[-9]) << 24);
unsigned char *cmp_start = (unsigned char *)(((uintptr_t)hdr_end) - cmp_and_hdr_size);
uint32_t cmp_ofs = cmp_and_hdr_size - header_size;
uint32_t out_ofs = cmp_and_hdr_size + addl_size;
@ -275,17 +316,20 @@ static kip1_header_t *kip1_uncompress(kip1_header_t *kip, size_t *size) {
kip1_header_t *apply_kip_ips_patches(kip1_header_t *kip, size_t kip_size) {
uint8_t hash[0x20];
se_calculate_sha256(hash, kip, kip_size);
if (!has_ips_patches("atmosphere/kip_patches", hash, sizeof(hash))) {
return NULL;
}
print(SCREEN_LOG_LEVEL_MANDATORY, "[NXBOOT]: Patching KIP %08x%08x...\n", (uint32_t)(kip->title_id >> 32), (uint32_t)kip->title_id);
size_t uncompressed_kip_size;
kip1_header_t *uncompressed_kip = kip1_uncompress(kip, &uncompressed_kip_size);
if (uncompressed_kip == NULL) {
return NULL;
}
if (apply_ips_patches("atmosphere/kip_patches", uncompressed_kip, uncompressed_kip_size, 0x100, hash, sizeof(hash))) {
return uncompressed_kip;
} else {
free(uncompressed_kip);
if (uncompressed_kip == NULL) {
return NULL;
}
apply_ips_patches("atmosphere/kip_patches", uncompressed_kip, uncompressed_kip_size, 0x100, hash, sizeof(hash));
return uncompressed_kip;
}

5
fusee/fusee-secondary/src/stratosphere.c
View file

@ -296,6 +296,8 @@ ini1_header_t *stratosphere_merge_inis(ini1_header_t **inis, size_t num_inis) {
if (already_loaded) {
continue;
}
print(SCREEN_LOG_LEVEL_MANDATORY, "[NXBOOT]: Loading KIP %08x%08x...\n", (uint32_t)(current_kip->title_id >> 32), (uint32_t)current_kip->title_id);
size_t current_kip_size = kip1_get_size_from_header(current_kip);
if (current_kip_size > remaining_size) {
@ -305,6 +307,9 @@ ini1_header_t *stratosphere_merge_inis(ini1_header_t **inis, size_t num_inis) {
kip1_header_t *patched_kip = apply_kip_ips_patches(current_kip, current_kip_size);
if (patched_kip != NULL) {
size_t patched_kip_size = kip1_get_size_from_header(patched_kip);
if (patched_kip_size > remaining_size) {
fatal_error("Not enough space for all the KIP1s!\n");
}
memcpy(current_dst_kip, patched_kip, patched_kip_size);
remaining_size -= patched_kip_size;
current_dst_kip += patched_kip_size;