John Reiser
d2718e99a4
into class PackLinuxElf32x86 : public PackLinuxElf32Le : public PackLinuxElf32 which makes the code for compressing ELF (for direct-to-memory decompression) cleaner because ELF has some of the class tree to itself. This assumes PROT_EXEC|PROT_WRITE ought to work. This is checked at runtime, and if it fails then give a message on stderr and exit(127). Modify --force-execve so that runtime avoids PROT_EXEC|PROT_WRITE. Then executables compressed with --force-execve will run under PaX, grSecurity, and strict SELinux.
73 lines
2.4 KiB
NASM
73 lines
2.4 KiB
NASM
; fold_exec86.asm -- linkage to C code to process Elf binary
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;
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; This file is part of the UPX executable compressor.
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;
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; Copyright (C) 2000-2004 John F. Reiser
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; All Rights Reserved.
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;
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; UPX and the UCL library are free software; you can redistribute them
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; and/or modify them under the terms of the GNU General Public License as
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; published by the Free Software Foundation; either version 2 of
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; the License, or (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program; see the file COPYING.
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; If not, write to the Free Software Foundation, Inc.,
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; 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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;
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; Markus F.X.J. Oberhumer Laszlo Molnar
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; <mfx@users.sourceforge.net> <ml1050@users.sourceforge.net>
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;
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; John F. Reiser
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; <jreiser@users.sourceforge.net>
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;
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BITS 32
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SECTION .text
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CPU 386
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;; control just falls through, after this part and compiled C code
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;; are uncompressed.
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%define szElf32_Ehdr 0x34
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%define szElf32_Phdr 8*4
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%define e_entry (16 + 2*2 + 4)
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%define p_vaddr 2*4
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%define p_memsz 5*4
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%define szl_info 12
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%define szp_info 12
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fold_begin: ; enter: %ebx= &Elf32_Ehdr of this program
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pop eax ; Pop the argument count
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mov ecx, esp ; argv starts just at the current stack top
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lea edx, [esp+eax*4+4] ; envp = &argv[argc + 1]
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mov edi, [ebx + e_entry]
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lea esi, [ebx + szElf32_Ehdr + szElf32_Phdr + szl_info]
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sub edi, esi ; length
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lea ebx, [2 + ebp] ; f_unfilter, maybe
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pusha ; (cprLen, cprSrc, f_decpr, xx, f_unf, envp, argv, argc)
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EXTERN upx_main
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call upx_main ; Call the UPX main function
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hlt ; Crash if somehow upx_main does return
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%define __NR_mmap 90
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global mmap
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mmap:
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push ebx
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lea ebx, [2*4 + esp]
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push byte __NR_mmap
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pop eax
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int 0x80
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pop ebx
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ret
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; vi:ts=8:et:nowrap
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