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/*
remove-ptpax.c: this file is part of the elfix package
Copyright (C) 2013 Anthony G. Basile
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, either version 3 of the License, or
(at your option) any later version.
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 <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <gelf.h>
#ifndef PT_PAX_FLAGS
#define PT_PAX_FLAGS 0x65041580
#endif
int
remove_ptpax(int fd)
{
Elf *elf;
GElf_Phdr phdr;
size_t i, phnum;
if(elf_version(EV_CURRENT) == EV_NONE)
{
printf("\tELF ERROR: Library out of date.\n");
return EXIT_FAILURE;
}
if((elf = elf_begin(fd, ELF_C_RDWR_MMAP, NULL)) == NULL)
{
printf("\tELF ERROR: elf_begin() fail: %s\n", elf_errmsg(elf_errno()));
return EXIT_FAILURE;
}
if(elf_kind(elf) != ELF_K_ELF)
{
elf_end(elf);
printf("\tELF ERROR: elf_kind() fail: this is not an elf file.\n");
return EXIT_FAILURE;
}
elf_getphdrnum(elf, &phnum);
for(i=0; i<phnum; i++)
{
if(gelf_getphdr(elf, i, &phdr) != &phdr)
{
elf_end(elf);
printf("\tELF ERROR: gelf_getphdr(): %s\n", elf_errmsg(elf_errno()));
return EXIT_FAILURE;
}
if(phdr.p_type == PT_PAX_FLAGS)
{
phdr.p_type = PT_NULL;
if(!gelf_update_phdr(elf, i, &phdr))
{
elf_end(elf);
printf("\tELF ERROR: gelf_update_phdr(): %s", elf_errmsg(elf_errno()));
return EXIT_FAILURE;
}
}
}
elf_end(elf);
return EXIT_SUCCESS;
}
int
main( int argc, char *argv[])
{
int fd;
if(argc != 2)
{
fprintf(stderr, "Usage: %s <filename>\n", argv[0]) ;
exit(EXIT_SUCCESS);
}
if((fd = open(argv[1], O_RDWR)) < 0)
{
printf("\topen(O_RDWR) failed: cannot change PT_PAX flags\n");
exit(EXIT_FAILURE);
}
else
exit(remove_ptpax(fd));
}
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