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mugurc
f3c514744b
nid_patcher turns the _nid_postfix names of a library into NIDs for ELF and PE. A library built on macOS is a Mach-O dylib, whose exports are in a dyld export trie and whose imports are in the chained fixups, so it gets its own patcher. - The export trie is read, every exported C name (without Mach-O's leading underscore) is resolved to its NID, and the trie is rebuilt the way ld64 lays it out: the offsets are uleb128, so the layout is repeated until it is stable. A trie that no longer fits is appended to __LINKEDIT, which has to end the file, and a signed image is refused. - Weak definitions that are not marked _nid_postfix or _nid_no_patch keep their names: dyld coalesces those across images by name. - In the chained imports, names bound to a .prx dylib that are guest facing (a _nid_postfix name or an sce prefix) are patched in place; a name that would grow, or that shares storage with another import, is an error. Images that use bind opcodes instead of chained fixups are refused. - ExportExclusions reads the exports of a reference Mach-O, so the exclusion list works for libraries built on macOS as well.
20 lines
768 B
C++
20 lines
768 B
C++
#include <nid/BinaryPatcherFactory.hpp>
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#include <nid/ElfPatcher.hpp>
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#include <nid/MachONidPatcher.hpp>
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#include <nid/PeNidPatcher.hpp>
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#include <stdexcept>
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namespace Nid {
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std::unique_ptr<IBinaryPatcher> MakePatcher(const std::vector<std::uint8_t>& binary) {
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if (binary.size() >= 4 && binary[0] == 0x7f && binary[1] == 'E' && binary[2] == 'L' && binary[3] == 'F')
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return std::make_unique<ElfNidPatcher>();
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if (binary.size() >= 2 && binary[0] == 'M' && binary[1] == 'Z')
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return std::make_unique<PeNidPatcher>();
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if (binary.size() >= 4 && binary[0] == 0xcf && binary[1] == 0xfa && binary[2] == 0xed && binary[3] == 0xfe)
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return std::make_unique<MachONidPatcher>();
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throw std::runtime_error("unrecognized binary format");
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}
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}
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