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finished elf header validation

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This commit is contained in:
georgemoralis 2023-04-05 20:21:44 +03:00
parent f58bb4abab
commit 56616f832e
2 changed files with 91 additions and 11 deletions
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65
emulator/Loader/Elf.cpp
View file

@ -151,10 +151,69 @@ bool Elf::isElfFile() const
{ {
return false; return false;
} }
if (m_elf_header->e_ident[0] != '\x7f' || m_elf_header->e_ident[1] != '\x45' || m_elf_header->e_ident[2] != '\x4c' || if (m_elf_header->e_ident[EI_MAG0] != ELFMAG0 || m_elf_header->e_ident[EI_MAG1] != ELFMAG1 || m_elf_header->e_ident[EI_MAG2] != ELFMAG2 ||
m_elf_header->e_ident[3] != '\x46') m_elf_header->e_ident[EI_MAG3] != ELFMAG3)
{ {
printf("Not an ELF file magic is wrong!\n"); printf("ERROR:Not an ELF file magic is wrong!\n");
return false;
}
if (m_elf_header->e_ident[EI_CLASS] != ELFCLASS64)
{
printf("ERROR:e_ident[EI_CLASS] expected 0x02 is (0x%x)\n", m_elf_header->e_ident[EI_CLASS]);
return false;
}
if (m_elf_header->e_ident[EI_DATA] != ELFDATA2LSB)
{
printf("ERROR:e_ident[EI_DATA] expected 0x01 is (0x%x)\n", m_elf_header->e_ident[EI_DATA]);
return false;
}
if (m_elf_header->e_ident[EI_VERSION] != EV_CURRENT)
{
printf("ERROR:e_ident[EI_VERSION] expected 0x01 is (0x%x)\n", m_elf_header->e_ident[EI_VERSION]);
return false;
}
if (m_elf_header->e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
{
printf("ERROR:e_ident[EI_OSABI] expected 0x09 is (0x%x)\n", m_elf_header->e_ident[EI_OSABI]);
return false;
}
if (m_elf_header->e_ident[EI_ABIVERSION] != ELFABIVERSION_AMDGPU_HSA_V2)
{
printf("ERROR:e_ident[EI_ABIVERSION] expected 0x00 is (0x%x)\n", m_elf_header->e_ident[EI_ABIVERSION]);
return false;
}
if (m_elf_header->e_type != ET_DYNEXEC && m_elf_header->e_type != ET_DYNAMIC)
{
printf("ERROR:e_type expected 0xFE10 OR 0xFE18 is (%04x)\n", m_elf_header->e_type);
return false;
}
if (m_elf_header->e_machine != EM_X86_64)
{
printf("ERROR:e_machine expected 0x3E is (%04x)\n", m_elf_header->e_machine);
return false;
}
if (m_elf_header->e_version != EV_CURRENT)
{
printf("ERROR:m_elf_header->e_version expected 0x01 is (0x%x)\n", m_elf_header->e_version);
return false;
}
if (m_elf_header->e_phentsize != sizeof(elf_program_header))
{
printf("ERROR:e_phentsize (%d) != sizeof(elf_program_header)\n", m_elf_header->e_phentsize);
return false;
}
if (m_elf_header->e_shentsize > 0 && m_elf_header->e_shentsize != sizeof(elf_section_header)) //commercial games doesn't appear to have section headers
{
printf("ERROR:e_shentsize (%d) != sizeof(elf_section_header)\n", m_elf_header->e_shentsize);
return false; return false;
} }

37
emulator/Loader/Elf.h
View file

@ -34,14 +34,35 @@ struct self_segment_header
}; };
constexpr int EI_MAG0 = 0;/* e_ident[] indexes */ constexpr u08 EI_MAG0 = 0;/* e_ident[] indexes */
constexpr int EI_MAG2 = 2; constexpr u08 EI_MAG1 = 1;
constexpr int EI_MAG3 = 3; constexpr u08 EI_MAG2 = 2;
constexpr int EI_CLASS = 4; constexpr u08 EI_MAG3 = 3;
constexpr int EI_DATA = 5; constexpr u08 EI_CLASS = 4;
constexpr int EI_VERSION = 6; constexpr u08 EI_DATA = 5;
constexpr int EI_OSABI = 7; constexpr u08 EI_VERSION = 6;
constexpr int EI_PAD = 8; constexpr u08 EI_OSABI = 7;
constexpr u08 EI_ABIVERSION = 8;
// Magic number
constexpr u08 ELFMAG0 = 0x7F;
constexpr u08 ELFMAG1 = 'E';
constexpr u08 ELFMAG2 = 'L';
constexpr u08 ELFMAG3 = 'F';
//other ident fields , only ps4 neccesary ones
constexpr u08 ELFCLASS64 = 2;
constexpr u08 ELFDATA2LSB = 1;
constexpr u08 ELFOSABI_FREEBSD = 9; // FreeBSD
constexpr u08 EV_CURRENT = 1;
constexpr u08 ELFABIVERSION_AMDGPU_HSA_V2 = 0;
//type fields PS4 specific
constexpr u16 ET_DYNEXEC = 0xFE10; // Executable file
constexpr u16 ET_DYNAMIC = 0xFE18; // Shared
//machine field
constexpr u16 EM_X86_64 = 62; // Advanced Micro Devices X86-64 processor
struct elf_header struct elf_header
{ {