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elf: handle decompress flag for 32 bit elfs

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This commit is contained in:
Jake 2018-06-20 20:50:57 -05:00 • committed by Ivan
parent b3a933ba84
commit 095d02e41b
3 changed files with 83 additions and 108 deletions
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77
rpcs3/Crypto/unself.h
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@ -1,6 +1,7 @@
#pragma once
#include "key_vault.h"
#include "zlib.h"
struct AppInfo
{
@ -414,6 +415,82 @@ public:
bool DecryptData();
bool DecryptNPDRM(u8 *metadata, u32 metadata_size);
bool GetKeyFromRap(u8 *content_id, u8 *npdrm_key);
private:
template<typename EHdr, typename SHdr, typename PHdr>
void WriteElf(fs::file& e, EHdr ehdr, SHdr shdr, PHdr phdr)
{
// Set initial offset.
u32 data_buf_offset = 0;
// Write ELF header.
WriteEhdr(e, ehdr);
// Write program headers.
for (u32 i = 0; i < ehdr.e_phnum; ++i)
{
WritePhdr(e, phdr[i]);
}
for (unsigned int i = 0; i < meta_hdr.section_count; i++)
{
// PHDR type.
if (meta_shdr[i].type == 2)
{
// Decompress if necessary.
if (meta_shdr[i].compressed == 2)
{
const auto filesz = phdr[meta_shdr[i].program_idx].p_filesz;
// Create a pointer to a buffer for decompression.
std::unique_ptr<u8[]> decomp_buf(new u8[filesz]);
// Create a buffer separate from data_buf to uncompress.
std::unique_ptr<u8[]> zlib_buf(new u8[data_buf_length]);
memcpy(zlib_buf.get(), data_buf.get(), data_buf_length);
uLongf decomp_buf_length = ::narrow<uLongf>(filesz);
// Use zlib uncompress on the new buffer.
// decomp_buf_length changes inside the call to uncompress
int rv = uncompress(decomp_buf.get(), &decomp_buf_length, zlib_buf.get() + data_buf_offset, data_buf_length);
// Check for errors (TODO: Probably safe to remove this once these changes have passed testing.)
switch (rv)
{
case Z_MEM_ERROR: LOG_ERROR(LOADER, "MakeELF encountered a Z_MEM_ERROR!"); break;
case Z_BUF_ERROR: LOG_ERROR(LOADER, "MakeELF encountered a Z_BUF_ERROR!"); break;
case Z_DATA_ERROR: LOG_ERROR(LOADER, "MakeELF encountered a Z_DATA_ERROR!"); break;
default: break;
}
// Seek to the program header data offset and write the data.
e.seek(phdr[meta_shdr[i].program_idx].p_offset);
e.write(decomp_buf.get(), filesz);
}
else
{
// Seek to the program header data offset and write the data.
e.seek(phdr[meta_shdr[i].program_idx].p_offset);
e.write(data_buf.get() + data_buf_offset, meta_shdr[i].data_size);
}
// Advance the data buffer offset by data size.
data_buf_offset += meta_shdr[i].data_size;
}
}
// Write section headers.
if (self_hdr.se_shdroff != 0)
{
e.seek(ehdr.e_shoff);
for (u32 i = 0; i < ehdr.e_shnum; ++i)
{
WriteShdr(e, shdr[i]);
}
}
}
};
extern fs::file decrypt_self(fs::file elf_or_self, u8* klic_key = nullptr);