4684ddb6aa
- import libcxx - reduce targets to the one when compiled as a tools Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
//===-- enable_execute_stack_test.c - Test __enable_execute_stack ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#if defined(_WIN32)
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#include <windows.h>
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void __clear_cache(void* start, void* end)
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{
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if (!FlushInstructionCache(GetCurrentProcess(), start, end-start))
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exit(1);
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}
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void __enable_execute_stack(void *addr)
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{
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MEMORY_BASIC_INFORMATION b;
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if (!VirtualQuery(addr, &b, sizeof(b)))
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exit(1);
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if (!VirtualProtect(b.BaseAddress, b.RegionSize, PAGE_EXECUTE_READWRITE, &b.Protect))
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exit(1);
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}
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#else
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#include <sys/mman.h>
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extern void __clear_cache(void* start, void* end);
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extern void __enable_execute_stack(void* addr);
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#endif
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typedef int (*pfunc)(void);
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int func1()
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{
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return 1;
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}
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int func2()
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{
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return 2;
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}
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int main()
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{
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unsigned char execution_buffer[128];
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// mark stack page containing execution_buffer to be executable
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__enable_execute_stack(execution_buffer);
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// verify you can copy and execute a function
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memcpy(execution_buffer, (void *)(uintptr_t)&func1, 128);
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__clear_cache(execution_buffer, &execution_buffer[128]);
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pfunc f1 = (pfunc)(uintptr_t)execution_buffer;
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if ((*f1)() != 1)
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return 1;
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// verify you can overwrite a function with another
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memcpy(execution_buffer, (void *)(uintptr_t)&func2, 128);
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__clear_cache(execution_buffer, &execution_buffer[128]);
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pfunc f2 = (pfunc)(uintptr_t)execution_buffer;
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if ((*f2)() != 2)
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return 1;
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return 0;
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}
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