我想将带有系统调用的 x86 Linux shellcode 转换为 ARM Linux 系统调用 [英] I want to convert x86 Linux shellcode with system calls to ARM Linux system calls
问题描述
我想将 Intel x86 汇编代码转换为 ARM.我不知道如何使用堆栈.
I want to convert Intel x86 assembly code to ARM. I do not know how to use the stack.
我使用 int 0x80
系统调用为 32 位 x86 Linux 编写了一个对 execve 的调用.
但是,ARM 使用 svc 或 swi.
I wrote a call to execve using an int 0x80
system call for 32-bit x86 Linux.
However, ARM uses svc or swi.
但我不知道如何使用这样的东西:push 0x0068732f
和 push 0x6e69622f
But I do not know how to use something like this:
push 0x0068732f
and push 0x6e69622f
.globl main
main:
push 0x0068732f
push 0x6e69622f
mov edx, 0
mov ecx, 0
mov ebx, esp
mov eax, 11
int 0x80
mov ebx, 0
mov eax, 1
int 0x80
arm 上的系统调用期望使用 swi 看起来像这样:
The syscall on arm expects to use the swi to look like this:
.global _start
_start:
?????
mov r7, #11
swi #0
_exit:
mov r7, #1
swi #0
我想使用堆栈推送方法而不是 .ascii 方法.
I want to use the stack push method rather than the .ascii method.
推荐答案
man syscall
arch/ABI instruction syscall # retval error Notes
────────────────────────────────────────────────────────────────────
arm/EABI swi 0x0 r7 r0 -
x32 syscall rax rax - [5]
arch/ABI arg1 arg2 arg3 arg4 arg5 arg6 arg7 Notes
──────────────────────────────────────────────────────────────
arm/EABI r0 r1 r2 r3 r4 r5 r6
参见:ARM 常量
.global _start
.equ label1, 0x0068732f
.equ label2, 0x6e69622f
_start:
movw r3, #:lower16:label1
movt r3, #:upper16:label1
movw r2, #:lower16:label2
movt r2, #:upper16:label2
push {r2,r3}
mov R3, #0
mov R2, #0
mov R1, #0
mov r0, sp
mov r7, #11
swi #0
_exit:
mov r0, #0
mov r7, #1
swi #0
<小时>
这是另一个例子,
Here is another example,
asm mov r0, #0
push {r0}
movw r1, #0x6548 @ He
movt r1, #0x6c6c @ ll
movw r2, #0x576f @ oW
movt r2, #0x726f @ or
movw r3, #0x646c @ ld
movt r3, #0x0a32 @ 2\n
push {r1,r2,r3} @ move register 'string' to stack.
@ write(unsigned int fd, const char *buf, size_t count)
mov r0, #1 @ stdout
mov r1, sp @ load string from stack
mov r2, #12 @ length
mov r7, #4 @ write() syscall number
swi #0 @ syscall
大多数现代 ARM CPU 将支持 movw
/movt
.还有其他方法可以做到这一点.但它们就像 '.ascii',因为 ARM 代码可以包含常量.这是上面博客中讨论的旧样式.我可能在上面的代码中混淆了一些顺序,但我认为这是正确的.
Most modern ARM CPUs will support movw
/movt
. There are other ways to do this. But they are like '.ascii' as ARM code can contain constants. That is the old style as discussed in the blog above. I might have some ordering mixed up in the code above, but I think it is right.
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