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/*
* Copyright (C) 2014-2016 Firejail Authors
*
* This file is part of firejail project
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "fseccomp.h"
#include "../include/seccomp.h"
#include <sys/syscall.h>
void seccomp_secondary_64(const char *fname) {
// hardcoded syscall values
struct sock_filter filter[] = {
VALIDATE_ARCHITECTURE_64,
EXAMINE_SYSCALL,
BLACKLIST(165), // mount
BLACKLIST(166), // umount2
// todo: implement --allow-debuggers
BLACKLIST(101), // ptrace
BLACKLIST(246), // kexec_load
BLACKLIST(304), // open_by_handle_at
BLACKLIST(303), // name_to_handle_at
BLACKLIST(174), // create_module
BLACKLIST(175), // init_module
BLACKLIST(313), // finit_module
BLACKLIST(176), // delete_module
BLACKLIST(172), // iopl
BLACKLIST(173), // ioperm
BLACKLIST(251), // ioprio_set
BLACKLIST(167), // swapon
BLACKLIST(168), // swapoff
BLACKLIST(103), // syslog
BLACKLIST(310), // process_vm_readv
BLACKLIST(311), // process_vm_writev
BLACKLIST(139), // sysfs
BLACKLIST(156), // _sysctl
BLACKLIST(159), // adjtimex
BLACKLIST(305), // clock_adjtime
BLACKLIST(212), // lookup_dcookie
BLACKLIST(298), // perf_event_open
BLACKLIST(300), // fanotify_init
BLACKLIST(312), // kcmp
BLACKLIST(248), // add_key
BLACKLIST(249), // request_key
BLACKLIST(250), // keyctl
BLACKLIST(134), // uselib
BLACKLIST(163), // acct
BLACKLIST(154), // modify_ldt
BLACKLIST(155), // pivot_root
BLACKLIST(206), // io_setup
BLACKLIST(207), // io_destroy
BLACKLIST(208), // io_getevents
BLACKLIST(209), // io_submit
BLACKLIST(210), // io_cancel
BLACKLIST(216), // remap_file_pages
BLACKLIST(237), // mbind
BLACKLIST(239), // get_mempolicy
BLACKLIST(238), // set_mempolicy
BLACKLIST(256), // migrate_pages
BLACKLIST(279), // move_pages
BLACKLIST(278), // vmsplice
BLACKLIST(161), // chroot
BLACKLIST(184), // tuxcall
BLACKLIST(169), // reboot
BLACKLIST(180), // nfsservctl
BLACKLIST(177), // get_kernel_syms
RETURN_ALLOW
};
// save filter to file
int dst = open(fname, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (dst < 0) {
fprintf(stderr, "Error fseccomp: cannot open %s file\n", fname);
exit(1);
}
int size = (int) sizeof(filter);
int written = 0;
while (written < size) {
int rv = write(dst, (unsigned char *) filter + written, size - written);
if (rv == -1) {
fprintf(stderr, "Error fseccomp: cannot write %s file\n", fname);
exit(1);
}
written += rv;
}
close(dst);
}
// i386 filter installed on amd64 architectures
void seccomp_secondary_32(const char *fname) {
// hardcoded syscall values
struct sock_filter filter[] = {
VALIDATE_ARCHITECTURE_32,
EXAMINE_SYSCALL,
BLACKLIST(21), // mount
BLACKLIST(52), // umount2
// todo: implement --allow-debuggers
BLACKLIST(26), // ptrace
BLACKLIST(283), // kexec_load
BLACKLIST(341), // name_to_handle_at
BLACKLIST(342), // open_by_handle_at
BLACKLIST(127), // create_module
BLACKLIST(128), // init_module
BLACKLIST(350), // finit_module
BLACKLIST(129), // delete_module
BLACKLIST(110), // iopl
BLACKLIST(101), // ioperm
BLACKLIST(289), // ioprio_set
BLACKLIST(87), // swapon
BLACKLIST(115), // swapoff
BLACKLIST(103), // syslog
BLACKLIST(347), // process_vm_readv
BLACKLIST(348), // process_vm_writev
BLACKLIST(135), // sysfs
BLACKLIST(149), // _sysctl
BLACKLIST(124), // adjtimex
BLACKLIST(343), // clock_adjtime
BLACKLIST(253), // lookup_dcookie
BLACKLIST(336), // perf_event_open
BLACKLIST(338), // fanotify_init
BLACKLIST(349), // kcmp
BLACKLIST(286), // add_key
BLACKLIST(287), // request_key
BLACKLIST(288), // keyctl
BLACKLIST(86), // uselib
BLACKLIST(51), // acct
BLACKLIST(123), // modify_ldt
BLACKLIST(217), // pivot_root
BLACKLIST(245), // io_setup
BLACKLIST(246), // io_destroy
BLACKLIST(247), // io_getevents
BLACKLIST(248), // io_submit
BLACKLIST(249), // io_cancel
BLACKLIST(257), // remap_file_pages
BLACKLIST(274), // mbind
BLACKLIST(275), // get_mempolicy
BLACKLIST(276), // set_mempolicy
BLACKLIST(294), // migrate_pages
BLACKLIST(317), // move_pages
BLACKLIST(316), // vmsplice
BLACKLIST(61), // chroot
BLACKLIST(88), // reboot
BLACKLIST(169), // nfsservctl
BLACKLIST(130), // get_kernel_syms
RETURN_ALLOW
};
// save filter to file
int dst = open(fname, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (dst < 0) {
fprintf(stderr, "Error fseccomp: cannot open %s file\n", fname);
exit(1);
}
int size = (int) sizeof(filter);
int written = 0;
while (written < size) {
int rv = write(dst, (unsigned char *) filter + written, size - written);
if (rv == -1) {
fprintf(stderr, "Error fseccomp: cannot write %s file\n", fname);
exit(1);
}
written += rv;
}
close(dst);
}
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