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ncch_container: Apply IPS patch after allocating .bss

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This allows an IPS patch to edit .bss. This is useful for game patches
that need to add code, as putting things in .bss allows adding new code
*without* editing .code and thus without having to relocate everything.
This commit is contained in:
Léo Lam 2019-06-30 18:27:00 +02:00
parent 2f7a10eeaa
commit 43d1ee6fb7
3 changed files with 26 additions and 14 deletions
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30
src/core/file_sys/ncch_container.cpp
View file

@ -539,26 +539,28 @@ Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vect
}
}
std::string override_ips = filepath + ".exefsdir/code.ips";
if (FileUtil::Exists(override_ips) && strcmp(name, ".code") == 0) {
FileUtil::IOFile ips_file(override_ips, "rb");
std::size_t ips_file_size = ips_file.GetSize();
std::vector<u8> ips(ips_file_size);
if (ips_file.IsOpen() &&
ips_file.ReadBytes(&ips[0], ips_file_size) == ips_file_size) {
LOG_INFO(Service_FS, "File {} patching code.bin", override_ips);
ApplyIPS(ips, buffer);
}
}
return Loader::ResultStatus::Success;
}
}
return Loader::ResultStatus::ErrorNotUsed;
}
bool NCCHContainer::ApplyIPSPatch(std::vector<u8>& code) const {
const std::string override_ips = filepath + ".exefsdir/code.ips";
FileUtil::IOFile ips_file{override_ips, "rb"};
if (!ips_file)
return false;
std::vector<u8> ips(ips_file.GetSize());
if (ips_file.ReadBytes(ips.data(), ips.size()) != ips.size())
return false;
LOG_INFO(Service_FS, "File {} patching code.bin", override_ips);
ApplyIPS(ips, code);
return true;
}
Loader::ResultStatus NCCHContainer::LoadOverrideExeFSSection(const char* name,
std::vector<u8>& buffer) {
std::string override_name;

7
src/core/file_sys/ncch_container.h
View file

@ -271,6 +271,13 @@ public:
*/
Loader::ResultStatus ReadExtdataId(u64& extdata_id);
/**
* Apply an IPS patch for .code (if it exists).
* This should only be called after allocating .bss.
* @return bool true if a patch was applied, false otherwise
*/
bool ApplyIPSPatch(std::vector<u8>& code) const;
/**
* Checks whether the NCCH container contains an ExeFS
* @return bool check result

3
src/core/loader/ncch.cpp
View file

@ -100,6 +100,9 @@ ResultStatus AppLoader_NCCH::LoadExec(std::shared_ptr<Kernel::Process>& process)
overlay_ncch->exheader_header.codeset_info.data.num_max_pages * Memory::PAGE_SIZE +
bss_page_size;
// Apply any IPS patch now that the entire codeset (including .bss) has been allocated
overlay_ncch->ApplyIPSPatch(code);
codeset->entrypoint = codeset->CodeSegment().addr;
codeset->memory = std::move(code);