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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>
24 lines
831 B
NASM
24 lines
831 B
NASM
;------------------------------------------------------------------------------
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; IA32/StackCookieInterrupt.nasm
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;
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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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DEFAULT REL
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SECTION .text
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;------------------------------------------------------------------------------
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; Checks the stack cookie value against __security_cookie and calls the
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; stack cookie failure handler if there is a mismatch.
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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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;------------------------------------------------------------------------------
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global ASM_PFX(TriggerStackCookieInterrupt)
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ASM_PFX(TriggerStackCookieInterrupt):
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int FixedPcdGet8 (PcdStackCookieExceptionVector)
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ret
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