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Diffstat (limited to 'src/VBox/HostDrivers/Support/posix/SUPR3HardenedMainA-posix.asm')
| -rw-r--r-- | src/VBox/HostDrivers/Support/posix/SUPR3HardenedMainA-posix.asm | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/src/VBox/HostDrivers/Support/posix/SUPR3HardenedMainA-posix.asm b/src/VBox/HostDrivers/Support/posix/SUPR3HardenedMainA-posix.asm new file mode 100644 index 00000000..2963c091 --- /dev/null +++ b/src/VBox/HostDrivers/Support/posix/SUPR3HardenedMainA-posix.asm @@ -0,0 +1,160 @@ +; $Id: SUPR3HardenedMainA-posix.asm $ +;; @file +; VirtualBox Support Library - Hardened main(), Posix assembly bits. +; + +; +; Copyright (C) 2017-2019 Oracle Corporation +; +; This file is part of VirtualBox Open Source Edition (OSE), as +; available from http://www.virtualbox.org. This file is free software; +; you can redistribute it and/or modify it under the terms of the GNU +; General Public License (GPL) as published by the Free Software +; Foundation, in version 2 as it comes in the "COPYING" file of the +; VirtualBox OSE distribution. VirtualBox OSE is distributed in the +; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. +; +; The contents of this file may alternatively be used under the terms +; of the Common Development and Distribution License Version 1.0 +; (CDDL) only, as it comes in the "COPYING.CDDL" file of the +; VirtualBox OSE distribution, in which case the provisions of the +; CDDL are applicable instead of those of the GPL. +; +; You may elect to license modified versions of this file under the +; terms and conditions of either the GPL or the CDDL or both. +; + + +;******************************************************************************* +;* Header Files * +;******************************************************************************* +%include "iprt/asmdefs.mac" + + +;********************************************************************************************************************************* +;* External Symbols * +;********************************************************************************************************************************* +; External code. +BEGINCODE +extern NAME(supR3HardenedPosixMonitor_VerifyLibrary) + +; External data +BEGINDATA +extern NAME(g_pfnDlopenReal) +%ifdef SUP_HARDENED_WITH_DLMOPEN +extern NAME(g_pfnDlmopenReal) +%endif + + + +BEGINCODE + +;; +; Wrapper for dlopen() handing the call over to the file verification code +; and resuming the call if we get a green light to load the library. +; +align 16 +BEGINPROC supR3HardenedPosixMonitor_Dlopen + push xBP + mov xBP, xSP + +%ifdef RT_ARCH_AMD64 + ; Save parameters on the stack + push rdi + push rsi +%else + sub esp, 4 ; 16-byte stack alignment before call. + push dword [xBP + 08h] ; first parameter. +%endif + + ; + ; Call the verification method. + ; + call NAME(supR3HardenedPosixMonitor_VerifyLibrary) + + ; + ; Restore parameters for the next call and get the stack back to the + ; original state. + ; +%ifdef RT_ARCH_AMD64 + pop rsi + pop rdi +%endif + leave + + ; Check the result and resume the call if the result is positive, + ; otherwise clean up and return NULL + test al, al + je short .failed + + ; Resume the original dlopen call by jumping into the saved code. + jmp [NAME(g_pfnDlopenReal) xWrtRIP] + +.failed: + ; + ; Don't use leave here as we didn't use the enter instruction. Just clear + ; xAX and return + ; + xor xAX, xAX + ret +ENDPROC supR3HardenedPosixMonitor_Dlopen + + +%ifdef SUP_HARDENED_WITH_DLMOPEN +;; +; Wrapper for dlmopen() handing the call over to the file verification code +; and resuming the call if we get a green light to load the library. +; +align 16 +BEGINPROC supR3HardenedPosixMonitor_Dlmopen + push xBP + mov xBP, xSP + +%ifdef RT_ARCH_AMD64 + sub rsp, 8 ; 16-byte stack alignment before call. + + ; Save parameters on the stack + push rdi + push rsi + push rdx + + mov rdi, rsi ; Move the second parameter to the front +%else + sub esp, 4 ; 16-byte stack alignment before call. + push dword [xBP + 0ch] ; Move the second parameter to the front +%endif + + ; + ; Call the verification method. + ; + call NAME(supR3HardenedPosixMonitor_VerifyLibrary) + + ; + ; Restore parameters for the next call and get the stack back to the + ; original state. + ; +%ifdef RT_ARCH_AMD64 + pop rdx + pop rsi + pop rdi +%endif + leave + + ; Check the result and resume the call if the result is positive, + ; otherwise clean up and return NULL + test al, al + je short .failed + + ; Resume the original dlopen call by jumping into the saved code. + jmp [NAME(g_pfnDlmopenReal) xWrtRIP] + +.failed: + ; + ; Don't use leave here as we didn't use the enter instruction. Just clear + ; xAX and return + ; + xor xAX, xAX + ret +ENDPROC supR3HardenedPosixMonitor_Dlmopen +%endif + |