首先,在编译模块之前,我们需要更改目标机器的地址: // 32位机器地址//取消注释这些行无符号的长sys_call_table = 0xc1672140;无符号的长sys_ni_syscall = 0xc10778b0;//64位机器地址//注释这些行//无符号的长sys_call_table = 0xffffffff81a00240;//无符号的长sys_ni_
PVOIDTlsBitmap; ULONGTlsBitmapBits[0x2]; PVOIDReadOnlySharedMemoryBase; PVOIDReadOnlySharedMemoryHeap; PVOID*ReadOnlyStaticServerData; PVOIDAnsiCodePageData; PVOIDOemCodePageData; PVOIDUnicodeCaseTableData; ULONGNumberOfProcessors; ULONGNtGlobalFlag; BYTESpare2[0x4]; LARGE_INTEGERCriticalSectionTim...
* It's possible that a 32-bit syscall implementation * takes a 64-bit parameter but nonetheless assumes that * the high bits are zero. Make sure we zero-extend all * of the args. */regs->ax=ia32_sys_call_table[nr]((unsigned int)regs->bx,(unsigned int)regs->cx,(unsigned int)regs...
intGetPeHeader(){PBYTEImageBase;PIMAGE_DOS_HEADERDos=NULL;PIMAGE_NT_HEADERSNt=NULL;PIMAGE_FILE_HEADERFile=NULL;PIMAGE_OPTIONAL_HEADEROptional=NULL;PIMAGE_EXPORT_DIRECTORYExportTable=NULL;PPEBPeb=(PPEB)__readgsqword(0x60);PLDR_MODULEpLoadModule;// NTDLLpLoadModule=(PLDR_MODULE)((PBYTE)Peb...
Stack Table,” in Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3A). General-protection 异常(#GP). 这SYSRET指令生成 #GP(0)如何这个RCX值是不合法的。这OS可以定位正确的地址通过下面一个或多个方法: 在执行SYSRET指令之前,确保RCX值是合法数。
SS.B ←1; (*32-bit stack segment*) SS.G ←1; (*4-KByte granularity *) 我们可以看到导致#UD异常的第一行条件与SYSCALL指令相同。至此,我们可以开始利用#UD异常导致VMExit事件并模拟系统调用了.在这之前,让我们回顾一下我们必须做的所有事情: ...
static__always_inlinevoid__wrmsr(unsignedintmsr, u32 low, u32 high) {asmvolatile( "1: wrmsr\n" "2:\n"_ASM_EXTABLE_TYPE(1b,2b, EX_TYPE_WRMSR) : :"c"(msr),"a"(low),"d"(high) :"memory"); } intel处理器中关于该指令的说明 ...
ret2syscall: ELF 32-bit LSB executable, Intel 80386, version 1 (GNU/Linux), statically linked, for GNU/Linux 2.6.24, BuildID[sha1]=2bff0285c2706a147e7b150493950de98f182b78, with debug_info, not stripped 看来是静态链接,那好办了,就是我们熟悉的ROP思想了,下面我简单说下这个思想是什么意思...
/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */ testw $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) jnz syscall_trace_entry cmpl $(nr_syscalls), %eax jae syscall_badsys syscall_call: call *sys_call_table(,%eax,4) ...
The hash function maps keys to the bucket index in the hash table. As the futex address is private to the address space of a process, it can be the same for more than one process. Hence, the address of the futex cannot be used directly as the key for hashing. Instead, the hash key...