Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 1 | //===-- enable_execute_stack_test.c - Test __enable_execute_stack ----------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Howard Hinnant | 9ad441f | 2010-11-16 22:13:33 +0000 | [diff] [blame] | 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | |
| 11 | #include <stdio.h> |
| 12 | #include <string.h> |
| 13 | #include <stdint.h> |
Anton Korobeynikov | 7e8904f | 2012-01-12 21:13:48 +0000 | [diff] [blame] | 14 | #if defined(_WIN32) |
| 15 | #include <windows.h> |
| 16 | void __clear_cache(void* start, void* end) |
| 17 | { |
| 18 | if (!FlushInstructionCache(GetCurrentProcess(), start, end-start)) |
| 19 | exit(1); |
| 20 | } |
| 21 | void __enable_execute_stack(void *addr) |
| 22 | { |
| 23 | MEMORY_BASIC_INFORMATION b; |
| 24 | |
| 25 | if (!VirtualQuery(addr, &b, sizeof(b))) |
| 26 | exit(1); |
| 27 | if (!VirtualProtect(b.BaseAddress, b.RegionSize, PAGE_EXECUTE_READWRITE, &b.Protect)) |
| 28 | exit(1); |
| 29 | } |
| 30 | #else |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 31 | #include <sys/mman.h> |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 32 | extern void __clear_cache(void* start, void* end); |
| 33 | extern void __enable_execute_stack(void* addr); |
Anton Korobeynikov | 7e8904f | 2012-01-12 21:13:48 +0000 | [diff] [blame] | 34 | #endif |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 35 | |
| 36 | typedef int (*pfunc)(void); |
| 37 | |
| 38 | int func1() |
| 39 | { |
| 40 | return 1; |
| 41 | } |
| 42 | |
| 43 | int func2() |
| 44 | { |
| 45 | return 2; |
| 46 | } |
| 47 | |
| 48 | |
| 49 | |
| 50 | |
| 51 | int main() |
| 52 | { |
Shantonu Sen | a07fa29 | 2009-10-28 15:54:04 +0000 | [diff] [blame] | 53 | unsigned char execution_buffer[128]; |
| 54 | // mark stack page containing execution_buffer to be executable |
| 55 | __enable_execute_stack(execution_buffer); |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 56 | |
| 57 | // verify you can copy and execute a function |
Shantonu Sen | a07fa29 | 2009-10-28 15:54:04 +0000 | [diff] [blame] | 58 | memcpy(execution_buffer, (void *)(uintptr_t)&func1, 128); |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 59 | __clear_cache(execution_buffer, &execution_buffer[128]); |
Shantonu Sen | a07fa29 | 2009-10-28 15:54:04 +0000 | [diff] [blame] | 60 | pfunc f1 = (pfunc)(uintptr_t)execution_buffer; |
Anton Korobeynikov | 7e8904f | 2012-01-12 21:13:48 +0000 | [diff] [blame] | 61 | if ((*f1)() != 1) |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 62 | return 1; |
| 63 | |
| 64 | // verify you can overwrite a function with another |
Shantonu Sen | a07fa29 | 2009-10-28 15:54:04 +0000 | [diff] [blame] | 65 | memcpy(execution_buffer, (void *)(uintptr_t)&func2, 128); |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 66 | __clear_cache(execution_buffer, &execution_buffer[128]); |
Shantonu Sen | a07fa29 | 2009-10-28 15:54:04 +0000 | [diff] [blame] | 67 | pfunc f2 = (pfunc)(uintptr_t)execution_buffer; |
Anton Korobeynikov | 7e8904f | 2012-01-12 21:13:48 +0000 | [diff] [blame] | 68 | if ((*f2)() != 2) |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 69 | return 1; |
| 70 | |
| 71 | return 0; |
| 72 | } |