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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>
26 lines
824 B
NASM
26 lines
824 B
NASM
;------------------------------------------------------------------------------
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; Arm/StackCookieInterrupt.asm
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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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EXPORT TriggerStackCookieInterrupt
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AREA |.text|, CODE, READONLY
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;------------------------------------------------------------------------------
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; Calls 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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;------------------------------------------------------------------------------
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TriggerStackCookieInterrupt PROC
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SWI FixedPcdGet8 (PcdStackCookieExceptionVector)
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BX LR
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TriggerStackCookieInterrupt ENDP
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END
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