projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 5e5fb415 AF |
1 | /** @file\r |
| 2 | Base Stack Check library for GCC/clang.\r | |
| 3 | \r | |
| 4 | Use -fstack-protector-all compiler flag to make the compiler insert the\r | |
| 5 | __stack_chk_guard "canary" value into the stack and check the value prior\r | |
| 6 | to exiting the function. If the "canary" is overwritten __stack_chk_fail()\r | |
| 7 | is called. This is GCC specific code.\r | |
| 8 | \r | |
| 9 | Copyright (c) 2012, Apple Inc. All rights reserved.<BR>\r | |
| 10 | This program and the accompanying materials\r | |
| 11 | are licensed and made available under the terms and conditions of the BSD License\r | |
| 12 | which accompanies this distribution. The full text of the license may be found at\r | |
| 13 | http://opensource.org/licenses/bsd-license.php.\r | |
| 14 | \r | |
| 15 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 16 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 17 | \r | |
| 18 | **/\r | |
| 19 | \r | |
| 20 | #include <Base.h>\r | |
| 21 | #include <Library/BaseLib.h>\r | |
| 22 | #include <Library/DebugLib.h>\r | |
| 23 | #include <Library/PcdLib.h>\r | |
| 24 | \r | |
| 25 | /// "canary" value that is inserted by the compiler into the stack frame.\r | |
| 66c6d4d6 | 26 | VOID *__stack_chk_guard = (VOID*)0x0AFF;\r |
| 5e5fb415 AF |
27 | \r |
| 28 | // If ASLR was enabled we could use\r | |
| 29 | //void (*__stack_chk_guard)(void) = __stack_chk_fail;\r | |
| 30 | \r | |
| 31 | /**\r | |
| 32 | Error path for compiler generated stack "canary" value check code. If the\r | |
| 33 | stack canary has been overwritten this function gets called on exit of the\r | |
| 34 | function.\r | |
| 35 | **/\r | |
| 36 | VOID\r | |
| 37 | __stack_chk_fail (\r | |
| 38 | VOID\r | |
| 39 | )\r | |
| 40 | {\r | |
| 41 | UINT8 DebugPropertyMask;\r | |
| 42 | \r | |
| 43 | DEBUG ((DEBUG_ERROR, "STACK FAULT: Buffer Overflow in function %a.\n", __builtin_return_address(0)));\r | |
| 44 | \r | |
| 45 | //\r | |
| 46 | // Generate a Breakpoint, DeadLoop, or NOP based on PCD settings even if\r | |
| 47 | // BaseDebugLibNull is in use.\r | |
| 48 | //\r | |
| 49 | DebugPropertyMask = PcdGet8 (PcdDebugPropertyMask);\r | |
| 50 | if ((DebugPropertyMask & DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED) != 0) {\r | |
| 51 | CpuBreakpoint ();\r | |
| 52 | } else if ((DebugPropertyMask & DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED) != 0) {\r | |
| 53 | CpuDeadLoop ();\r | |
| 54 | }\r | |
| 55 | }\r |