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5000568969
StackCheckLib contains the required functionality for initializing the stack cookie value, checking the value, and triggering an interrupt when a mismatch occurs. The stack cookie is a random value placed on the stack between the stack variables and the return address so that continuously writing past the stack variables will cause the stack cookie to be overwritten. Before the function returns, the stack cookie value will be checked and if there is a mismatch then StackCheckLib handles the failure. Because UEFI doesn't use the C runtime libraries provided by MSVC, the stack check code is written in assembly within this library. GCC and Clang compilers have built-in support for stack cookie checking, so this library only handles failures. Signed-off-by: Oliver Smith-Denny <osde@linux.microsoft.com>
39 lines
962 B
C
39 lines
962 B
C
/** @file
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Provides the required functionality for handling stack
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cookie check failures in GCC.
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Copyright (c) Microsoft Corporation.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseLib.h>
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#include <Library/StackCheckFailureHookLib.h>
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/**
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Triggers an interrupt using the vector specified by PcdStackCookieExceptionVector
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**/
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VOID
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TriggerStackCookieInterrupt (
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VOID
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);
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VOID *__stack_chk_guard = (VOID *)(UINTN)STACK_COOKIE_VALUE;
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/**
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This function gets called when a gcc/clang generated stack cookie fails. This implementation calls into a platform
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failure hook lib and then triggers the stack cookie interrupt.
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**/
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VOID
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__stack_chk_fail (
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VOID
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)
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{
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DEBUG ((DEBUG_ERROR, "Stack cookie check failed at address 0x%llx!\n", RETURN_ADDRESS (0)));
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StackCheckFailureHook (RETURN_ADDRESS (0));
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TriggerStackCookieInterrupt ();
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}
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