Mov eax large gs:14h

Author: hspj

August undefined, 2024

Nettet19. jun. 2016 · full code: mov eax, large fs:18h mov eax, [eax+30h] push eax movzx eax, byte ptr [eax+2] call unkfunc jnz loc_4031ED. var_1C= byte ptr -1Ch fldz fstenv [esp+var_1C] jmp short test_eax_eax. @blabb why don't you create a proper answer, this comment of yours has almost all qualities of a good answer already. Nettet5. apr. 2024 · TI_GDT equ 0 RPL0 equ 0 SELECTOR_VIDEO equ (0x0003<<3) + TI_GDT + RPL0 [bits 32] section .text ;===== put_char ===== ; Func: Put one char in stack to cursor position ;===== global put_char put_char: pushad ; Backup 32 bits register env ; Need to make sure gs is correct Video Selector, assign value for gs each time print …

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Nettet1 Answer. Looks like it's Windows code, loading the address of the Process Environment Block (PEB), via the Thread Information Block, which can be accessed via the FS … The manipulation of gs:0x14 looks like a stack canary. xor %eax, %eax is simply a way of setting eax to 0. lea -0xc (%ebp), %eax loads the address of your buff into eax, so it can be passed into gets/puts. – DCoder Sep 2, 2012 at 9:34 thanks alot Qiau and DCoder... :-) – kriss Sep 2, 2012 at 10:14 2 Nettet27. feb. 2024 · Unlike MSVC, GCC while compiling without optimization turned on, emitting MOV EAX, 0 instead of shorteropcode. The last instruction LEAVE is MOV ESP, EBP … hema plastificeren

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Nettet26. feb. 2024 · .text:08048893 mov ecx, 14h .text:08048898 rep stosd In main, right before we set up the arguments for read_from_user, we use the rep stosd instruction to store the dword eax at edi, ecx times. Nettet2. jul. 2003 · 发表回复. chenm001 2003-07-02. 对FS在Win32中存放的是一个数据结构的指针，可惜我忘记结构名了. 紫郢剑侠 2003-07-02. test eax, eax. jnz short loc_40B236. 当结果非零时跳到loc_40B@36处。. waterstony 2003-06-30. WndClass = WNDCLASSA ptr … hema plexiglas fotoNettet意思是从地址gs:0x14的内存中读取4个字节到eax中。 gs 是一个段寄存器。最有可能的线程本地存储 (AKA TLS )是通过此寄存器引用的。 0x08048483 <+ 15 >: xor … hemapo harga

"Nettetmov eax, esi mov edi, ebx mov ecx, 14h rep stosd mov dword ptr [esp+0Ch], 0Ah mov dword ptr [esp+8], 50h mov ... jz short loc_80488F8 mov [esp], ebx call sub_8048A50 … " - Mov eax large gs:14h

Mov eax large gs:14h

NettetFrom what I've read on the topic, a cookie is set during the prologue then checked again in the epilogue. Well I can see the cookie being set, but it is not like the examples I've seen online. push ebp mov ebp,esp push FFFFFFFF push sdk.FAB99E9 ; New Exception handler mov eax,dword ptr fs: [0] ; Old Exception handler push eax sub esp,14 ... NettetIntel VT学习笔记（六）—— VM-Exit HandlerReutrn To DriverEntryVM-Exit HandlerExternal interruptI/O instructionControl-register accessesCPUIDVMCALL完整代码参考资料Reutrn To DriverEntry 描述：当开启VT后，就可以从Driv…

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Nettet19. sep. 2024 · In Windows on x86, a pointer to per-thread information is kept in the fs register (for x86-32) or the gs register (for x86-64). If you disassemble through the kernel, you’ll see that accesses to the per-thread information usually goes through two steps: mov eax, dword ptr fs: [0x00000018] mov eax, dword ptr [eax+n] Nettet30. jan. 2024 · 它使eax指向一个存在于堆栈中的局部变量。 sub $0x10,%esp为他们分配了一些空间。 0x08048488 <+20>: mov %eax,(%esp) #make esp point to the address …

Nettet14. jun. 2013 · 你好楼主，这个large应该是IDA自己添加的，这段代码应该是有关结构化异常处理的。 FS段寄存器用于访问线程的线程环境块，也就是通常说的（TEB）, 第二句 … Nettet14. okt. 2024 · large. pop large dword ptr fs:0 is IDA's way of bringing to your attention that fs:0 is a far pointer: a regular offset ( 0) but with a segment selector ( fs ). I.e. large has nothing to do with the width of the data (dword), but the address (segment+offset). However, large doesn't really add any new information, that line simply means pop ...

Nettet2. jul. 2003 · 发表回复. chenm001 2003-07-02. 对FS在Win32中存放的是一个数据结构的指针，可惜我忘记结构名了. 紫郢剑侠 2003-07-02. test eax, eax. jnz short loc_40B236. … Nettet5. apr. 2024 · An invalid free vulnerability exists in the Frame stream parser functionality of Ichitaro 2024 1.0.1.57600. A specially crafted document can lead to an attempt to free a stack pointer, which causes memory corruption. An attacker can provide a...

Nettet7. sep. 2024 · 因为v6的地址是esp+3Ch 而这里 mov edx, [esp+3ch]就可以知道edx里面存在的就应该是v6的值了看到这里利用edx中获取的v6的值与large gs：14h进行 xor判 …

Nettet8. apr. 2024 · the app loads the PEB struct into EAX —> mov eax, large fs:30h. I will follow the value of eax in dump to see the PED sturct. Stage(3) I will see the value of combination of flags —> mov eax, [eax+68h] we notice that the value is 0x70 and this means the process is being debugged. Stage(4) To bypass this technique must change … land of misfit toys elephantNettetmov eax, offset aHelloWorld ; "hello, world" mov [esp+10h+var_10], eax call _printf mov eax, 0 leave retn main endp Almostthesame. Addressof“helloworld”string(storedindatasegment)issavedinEAXregisterfirst,thenit stored into stack. Also, in function prologue we see AND ESP, 0FFFFFFF0h — this instruction … hema-plexNettetHi guys, I tried to use mcsema to translate binutils/elfedit into llvm, but I found that mcsema translates the following instruction: mov eax, large gs:14h as %117 = load i32* inttoptr … hema picturesNettet.text:08048B41 mov eax, large gs:14h .text:08048B47 mov [ebp+var_C], eax .text:08048B4A xor eax, eax .text:08048B4C mov [ebp+var_24], 1 .text:08048B53 call cart .text:08048B58 mov [ebp+var_28], eax .text:08048B5B cmp [ebp+var_28], 7174 ; insert stack address .text:08048B62 jnz short loc_8048BA1 hemap of prythianNettet.text:08048794 65 A1 14 00+ mov eax, large gs:14h .text:0804879A 89 45 F4 mov [ebp+canary_C], eax .text:0804879D 31 C0 xor eax, eax .text:0804879F C7 45 CC 00+ mov [ebp+msg_ctr_34], 0 .text:080487A6 E9 6D 01 00+ jmp LOOP_END_8048918 hema plateauNettet5. apr. 2024 · This won't happen in this // particular code because we have a strong pointer outstanding. 0128C mov rax,qword ptr [rbx] 0128F mov rcx,rbx 01292 call qword ptr [rax+8] // Now the strong pointer goes away... first down count the strong // count and then the weak count as before, -1 still in esi. 01295 mov eax,esi 01297 lock xadd dword ptr … hema poster collageNettetloc_80488F8: mov edx, [esp+6Ch] xor edx, large gs:14h jnz short loc_804890D loc_8048858: cmp ds:dword_804C3C0, 1 mov [esp+8], ebx mov dword ptr [esp+4], offset aSInvalidComman sbb eax, eax not eax add eax, 24h mov [esp+0Ch], eax mov dword ptr [esp], 1 call ___printf_chk hema poleaxe