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|
; $Id: SUPR3HardenedMainA-posix.asm $
;; @file
; VirtualBox Support Library - Hardened main(), Posix assembly bits.
;
;
; Copyright (C) 2017-2023 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation, in version 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox 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.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
;*******************************************************************************
;* 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
|
