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file_sys: Handle patch applying failures

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This changes ApplyCodePatch to return a ResultStatus, which makes it
possible to determine whether patch applying has failed. Previously,
only a boolean was returned, and false was returned when no patch
was found OR when a patch was found but applying it failed.

This also changes AppLoader_NCCH to return an error if patching fails
because the executable is likely to be left in an inconsistent state
and we should not proceed booting in that case.
This commit is contained in:
Léo Lam 2019-12-21 13:31:34 +01:00
parent 1377be9902
commit 3140086c60
3 changed files with 13 additions and 9 deletions
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12
src/core/file_sys/ncch_container.cpp
View file

@ -507,20 +507,22 @@ Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vect
return Loader::ResultStatus::ErrorNotUsed;
}
bool NCCHContainer::ApplyCodePatch(std::vector<u8>& code) const {
Loader::ResultStatus NCCHContainer::ApplyCodePatch(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;
return Loader::ResultStatus::ErrorNotUsed;
std::vector<u8> ips(ips_file.GetSize());
if (ips_file.ReadBytes(ips.data(), ips.size()) != ips.size())
return false;
return Loader::ResultStatus::Error;
LOG_INFO(Service_FS, "File {} patching code.bin", override_ips);
Patch::ApplyIpsPatch(ips, code);
return true;
if (!Patch::ApplyIpsPatch(ips, code))
return Loader::ResultStatus::Error;
return Loader::ResultStatus::Success;
}
Loader::ResultStatus NCCHContainer::LoadOverrideExeFSSection(const char* name,

4
src/core/file_sys/ncch_container.h
View file

@ -274,9 +274,9 @@ public:
/**
* Apply a patch for .code (if it exists).
* This should only be called after allocating .bss.
* @return bool true if a patch was applied, false otherwise
* @return ResultStatus success if a patch was applied, ErrorNotUsed if no patch was found
*/
bool ApplyCodePatch(std::vector<u8>& code) const;
Loader::ResultStatus ApplyCodePatch(std::vector<u8>& code) const;
/**
* Checks whether the NCCH container contains an ExeFS

6
src/core/loader/ncch.cpp
View file

@ -100,8 +100,10 @@ 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->ApplyCodePatch(code);
// Apply patches now that the entire codeset (including .bss) has been allocated
const ResultStatus patch_result = overlay_ncch->ApplyCodePatch(code);
if (patch_result != ResultStatus::Success && patch_result != ResultStatus::ErrorNotUsed)
return patch_result;
codeset->entrypoint = codeset->CodeSegment().addr;
codeset->memory = std::move(code);