Atmosphere/stratosphere/loader/source/ldr_meta.cpp

206 lines
7.8 KiB
C++

/*
* Copyright (c) 2018-2020 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 "ldr_capabilities.hpp"
#include "ldr_content_management.hpp"
#include "ldr_meta.hpp"
namespace ams::ldr {
namespace {
/* Convenience definitions. */
constexpr size_t MetaCacheBufferSize = 0x8000;
constexpr const char *MetaFilePath = "/main.npdm";
/* Types. */
struct MetaCache {
Meta meta;
u8 buffer[MetaCacheBufferSize];
};
/* Global storage. */
ncm::ProgramId g_cached_program_id;
cfg::OverrideStatus g_cached_override_status;
MetaCache g_meta_cache;
MetaCache g_original_meta_cache;
/* Helpers. */
Result ValidateSubregion(size_t allowed_start, size_t allowed_end, size_t start, size_t size, size_t min_size = 0) {
R_UNLESS(size >= min_size, ResultInvalidMeta());
R_UNLESS(allowed_start <= start, ResultInvalidMeta());
R_UNLESS(start <= allowed_end, ResultInvalidMeta());
R_UNLESS(start + size <= allowed_end, ResultInvalidMeta());
return ResultSuccess();
}
Result ValidateNpdm(const Npdm *npdm, size_t size) {
/* Validate magic. */
R_UNLESS(npdm->magic == Npdm::Magic, ResultInvalidMeta());
/* Validate flags. */
u32 mask = ~0x1F;
if (hos::GetVersion() < hos::Version_700) {
/* 7.0.0 added 0x10 as a valid bit to NPDM flags, so before that we only check 0xF. */
mask = ~0xF;
}
R_UNLESS(!(npdm->flags & mask), ResultInvalidMeta());
/* Validate Acid extents. */
R_TRY(ValidateSubregion(sizeof(Npdm), size, npdm->acid_offset, npdm->acid_size, sizeof(Acid)));
/* Validate Aci extends. */
R_TRY(ValidateSubregion(sizeof(Npdm), size, npdm->aci_offset, npdm->aci_size, sizeof(Aci)));
return ResultSuccess();
}
Result ValidateAcid(const Acid *acid, size_t size) {
/* Validate magic. */
R_UNLESS(acid->magic == Acid::Magic, ResultInvalidMeta());
/* TODO: Check if retail flag is set if not development hardware. */
/* Validate Fac, Sac, Kac. */
R_TRY(ValidateSubregion(sizeof(Acid), size, acid->fac_offset, acid->fac_size));
R_TRY(ValidateSubregion(sizeof(Acid), size, acid->sac_offset, acid->sac_size));
R_TRY(ValidateSubregion(sizeof(Acid), size, acid->kac_offset, acid->kac_size));
return ResultSuccess();
}
Result ValidateAci(const Aci *aci, size_t size) {
/* Validate magic. */
R_UNLESS(aci->magic == Aci::Magic, ResultInvalidMeta());
/* Validate Fah, Sac, Kac. */
R_TRY(ValidateSubregion(sizeof(Aci), size, aci->fah_offset, aci->fah_size));
R_TRY(ValidateSubregion(sizeof(Aci), size, aci->sac_offset, aci->sac_size));
R_TRY(ValidateSubregion(sizeof(Aci), size, aci->kac_offset, aci->kac_size));
return ResultSuccess();
}
Result LoadMetaFromFile(FILE *f, MetaCache *cache) {
/* Reset cache. */
cache->meta = {};
/* Read from file. */
size_t npdm_size = 0;
{
/* Get file size. */
fseek(f, 0, SEEK_END);
npdm_size = ftell(f);
fseek(f, 0, SEEK_SET);
/* Read data into cache buffer. */
R_UNLESS(npdm_size <= MetaCacheBufferSize, ResultTooLargeMeta());
R_UNLESS(fread(cache->buffer, npdm_size, 1, f) == 1, ResultTooLargeMeta());
}
/* Ensure size is big enough. */
R_UNLESS(npdm_size >= sizeof(Npdm), ResultInvalidMeta());
/* Validate the meta. */
{
Meta *meta = &cache->meta;
Npdm *npdm = reinterpret_cast<Npdm *>(cache->buffer);
R_TRY(ValidateNpdm(npdm, npdm_size));
Acid *acid = reinterpret_cast<Acid *>(cache->buffer + npdm->acid_offset);
Aci *aci = reinterpret_cast<Aci *>(cache->buffer + npdm->aci_offset);
R_TRY(ValidateAcid(acid, npdm->acid_size));
R_TRY(ValidateAci(aci, npdm->aci_size));
/* Set Meta members. */
meta->npdm = npdm;
meta->acid = acid;
meta->aci = aci;
meta->acid_fac = reinterpret_cast<u8 *>(acid) + acid->fac_offset;
meta->acid_sac = reinterpret_cast<u8 *>(acid) + acid->sac_offset;
meta->acid_kac = reinterpret_cast<u8 *>(acid) + acid->kac_offset;
meta->aci_fah = reinterpret_cast<u8 *>(aci) + aci->fah_offset;
meta->aci_sac = reinterpret_cast<u8 *>(aci) + aci->sac_offset;
meta->aci_kac = reinterpret_cast<u8 *>(aci) + aci->kac_offset;
}
return ResultSuccess();
}
}
/* API. */
Result LoadMeta(Meta *out_meta, ncm::ProgramId program_id, const cfg::OverrideStatus &status) {
FILE *f = nullptr;
/* Try to load meta from file. */
R_TRY(OpenCodeFile(f, program_id, status, MetaFilePath));
{
ON_SCOPE_EXIT { fclose(f); };
R_TRY(LoadMetaFromFile(f, &g_meta_cache));
}
/* Patch meta. Start by setting all program ids to the current program id. */
Meta *meta = &g_meta_cache.meta;
meta->acid->program_id_min = program_id;
meta->acid->program_id_max = program_id;
meta->aci->program_id = program_id;
/* For HBL, we need to copy some information from the base meta. */
if (status.IsHbl()) {
if (R_SUCCEEDED(OpenCodeFileFromBaseExefs(f, program_id, status, MetaFilePath))) {
ON_SCOPE_EXIT { fclose(f); };
if (R_SUCCEEDED(LoadMetaFromFile(f, &g_original_meta_cache))) {
Meta *o_meta = &g_original_meta_cache.meta;
/* Fix pool partition. */
if (hos::GetVersion() >= hos::Version_500) {
meta->acid->flags = (meta->acid->flags & 0xFFFFFFC3) | (o_meta->acid->flags & 0x0000003C);
}
/* Fix flags. */
const u16 program_info_flags = caps::GetProgramInfoFlags(o_meta->aci_kac, o_meta->aci->kac_size);
caps::SetProgramInfoFlags(program_info_flags, meta->acid_kac, meta->acid->kac_size);
caps::SetProgramInfoFlags(program_info_flags, meta->aci_kac, meta->aci->kac_size);
}
}
}
/* Set output. */
g_cached_program_id = program_id;
g_cached_override_status = status;
*out_meta = *meta;
return ResultSuccess();
}
Result LoadMetaFromCache(Meta *out_meta, ncm::ProgramId program_id, const cfg::OverrideStatus &status) {
if (g_cached_program_id != program_id || g_cached_override_status != status) {
return LoadMeta(out_meta, program_id, status);
}
*out_meta = g_meta_cache.meta;
return ResultSuccess();
}
void InvalidateMetaCache() {
/* Set the cached program id back to zero. */
g_cached_program_id = {};
}
}