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Added auxiliary vectors

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TODO: We might add examples run-time one day.
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Kamay Xutax 2022-06-29 23:49:41 +02:00 committed by Serge Lamikhov-Center
parent 91017d3edb
commit e633e80886
1 changed files with 75 additions and 0 deletions
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75
elfio/elf_types.hpp
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@ -1019,6 +1019,49 @@ constexpr Elf_Word DF_TEXTREL = 0x4;
constexpr Elf_Word DF_BIND_NOW = 0x8;
constexpr Elf_Word DF_STATIC_TLS = 0x10;
// Legal values for d_tag (dynamic entry type).
constexpr Elf_Word AT_NULL = 0; // End of vector
constexpr Elf_Word AT_IGNORE = 1; // Entry should be ignored
constexpr Elf_Word AT_EXECFD = 2; // File descriptor of program
constexpr Elf_Word AT_PHDR = 3; // Program headers for program
constexpr Elf_Word AT_PHENT = 4; // Size of program header entry
constexpr Elf_Word AT_PHNUM = 5; // Number of program headers
constexpr Elf_Word AT_PAGESZ = 6; // System page size
constexpr Elf_Word AT_BASE = 7; // Base address of interpreter
constexpr Elf_Word AT_FLAGS = 8; // Flags
constexpr Elf_Word AT_ENTRY = 9; // Entry point of program
constexpr Elf_Word AT_NOTELF = 10; // Program is not ELF
constexpr Elf_Word AT_UID = 11; // Real uid
constexpr Elf_Word AT_EUID = 12; // Effective uid
constexpr Elf_Word AT_GID = 13; // Real gid
constexpr Elf_Word AT_EGID = 14; // Effective gid
constexpr Elf_Word AT_CLKTCK = 17; // Frequency of times()
constexpr Elf_Word AT_PLATFORM = 15; // String identifying platform.
constexpr Elf_Word AT_HWCAP = 16; // Hints about processor capabilities.
constexpr Elf_Word AT_FPUCW = 18; // Used FPU control word.
constexpr Elf_Word AT_DCACHEBSIZE = 19; // Data cache block size.
constexpr Elf_Word AT_ICACHEBSIZE = 20; // Instruction cache block size.
constexpr Elf_Word AT_UCACHEBSIZE = 21; // Unified cache block size.
constexpr Elf_Word AT_IGNOREPPC = 22; // Entry should be ignored.
constexpr Elf_Word AT_SECURE = 23; // Boolean, was exec setuid-like?
constexpr Elf_Word AT_BASE_PLATFORM = 24; // String identifying real platforms.
constexpr Elf_Word AT_RANDOM = 25; // Address of 16 random bytes.
constexpr Elf_Word AT_HWCAP2 = 26; // More hints about processor capabilities.
constexpr Elf_Word AT_EXECFN = 31; // Filename of executable.
constexpr Elf_Word AT_SYSINFO = 32; // EP to the system call in the vDSO.
constexpr Elf_Word AT_SYSINFO_EHDR = 33; // Start of the ELF header of the vDSO.
constexpr Elf_Word AT_L1I_CACHESHAPE = 34;
constexpr Elf_Word AT_L1D_CACHESHAPE = 35;
constexpr Elf_Word AT_L2_CACHESHAPE = 36;
constexpr Elf_Word AT_L3_CACHESHAPE = 37;
constexpr Elf_Word AT_L1I_CACHESIZE = 40;
constexpr Elf_Word AT_L1I_CACHEGEOMETRY = 41;
constexpr Elf_Word AT_L1D_CACHESIZE = 42;
constexpr Elf_Word AT_L1D_CACHEGEOMETRY = 43;
constexpr Elf_Word AT_L2_CACHESIZE = 44;
constexpr Elf_Word AT_L2_CACHEGEOMETRY = 45;
constexpr Elf_Word AT_L3_CACHESIZE = 46;
// ELF file header
struct Elf32_Ehdr
{
@ -1210,6 +1253,38 @@ struct Elfxx_Vernaux
Elf_Word vna_next;
};
// ELF auxiliary vectors, they are usually run-time information
// being passed to program when the kernel is loading it.
// This is now required,
// because in order to initialize the stack cookie
// to protect against buffer overflows,
// most of libc ask us to have a valid pointer for the AT_RANDOM entry.
// glibc for example crashes if you don't.
// https://sourceware.org/git/?p=glibc.git;a=blob;f=csu/libc-start.c;h=543560f36c33b07a1fbe1b7e4578374fe8007b1f;hb=HEAD#l308
// This is also useful to be able to reconstruct at run-time
// the ELF headers, if ELF headers were erased after loading.
// Although this library is targeted to be parsing files only,
// I assume auxiliary vectors could be also used to get
// more information about the ELF binary at run-time in future.
// The main purpose is also for ELF injectors.
struct Elf32_auxv
{
uint32_t a_type; // Entry type
union {
uint32_t a_val; // Integer value, usually a pointer
} a_un;
};
struct Elf64_auxv
{
uint64_t a_type; // Entry type
union {
uint64_t a_val; // Integer value, usually a pointer
} a_un;
};
#ifdef __cplusplus
} // namespace ELFIO
#endif