From patchwork Fri Jul 14 11:36:55 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eduardo Otubo X-Patchwork-Id: 9840667 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B02DF60393 for ; Fri, 14 Jul 2017 11:43:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A2F682876E for ; Fri, 14 Jul 2017 11:43:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 981302875A; Fri, 14 Jul 2017 11:43:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C5F382876E for ; Fri, 14 Jul 2017 11:43:11 +0000 (UTC) Received: from localhost ([::1]:37182 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dVz03-0004e0-2V for patchwork-qemu-devel@patchwork.kernel.org; Fri, 14 Jul 2017 07:43:11 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35135) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dVyuL-00085h-JZ for qemu-devel@nongnu.org; Fri, 14 Jul 2017 07:37:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dVyuH-0006ml-FT for qemu-devel@nongnu.org; Fri, 14 Jul 2017 07:37:17 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57657) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dVyuH-0006m9-6B for qemu-devel@nongnu.org; Fri, 14 Jul 2017 07:37:13 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 205ACC057FAD for ; Fri, 14 Jul 2017 11:37:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 205ACC057FAD Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=otubo@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 205ACC057FAD Received: from vader.redhat.com (ovpn-117-45.ams2.redhat.com [10.36.117.45]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1FA0A65EA5; Fri, 14 Jul 2017 11:37:10 +0000 (UTC) From: Eduardo Otubo To: qemu-devel@nongnu.org Date: Fri, 14 Jul 2017 13:36:55 +0200 Message-Id: <20170714113700.21319-2-otubo@redhat.com> In-Reply-To: <20170714113700.21319-1-otubo@redhat.com> References: <20170714113700.21319-1-otubo@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Fri, 14 Jul 2017 11:37:12 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 1/6] seccomp: changing from whitelist to blacklist X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Otubo Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP This patch changes the default behavior of the seccomp filter from whitelist to blacklist. By default now all system calls are allowed and a small black list of definitely forbidden ones was created. Signed-off-by: Eduardo Otubo --- qemu-seccomp.c | 256 +++++++-------------------------------------------------- vl.c | 7 +- 2 files changed, 33 insertions(+), 230 deletions(-) diff --git a/qemu-seccomp.c b/qemu-seccomp.c index df75d9c471..f8877b07b5 100644 --- a/qemu-seccomp.c +++ b/qemu-seccomp.c @@ -31,229 +31,29 @@ struct QemuSeccompSyscall { uint8_t priority; }; -static const struct QemuSeccompSyscall seccomp_whitelist[] = { - { SCMP_SYS(timer_settime), 255 }, - { SCMP_SYS(timer_gettime), 254 }, - { SCMP_SYS(futex), 253 }, - { SCMP_SYS(select), 252 }, - { SCMP_SYS(recvfrom), 251 }, - { SCMP_SYS(sendto), 250 }, - { SCMP_SYS(socketcall), 250 }, - { SCMP_SYS(read), 249 }, - { SCMP_SYS(io_submit), 249 }, - { SCMP_SYS(brk), 248 }, - { SCMP_SYS(clone), 247 }, - { SCMP_SYS(mmap), 247 }, - { SCMP_SYS(mprotect), 246 }, - { SCMP_SYS(execve), 245 }, - { SCMP_SYS(open), 245 }, - { SCMP_SYS(ioctl), 245 }, - { SCMP_SYS(socket), 245 }, - { SCMP_SYS(setsockopt), 245 }, - { SCMP_SYS(recvmsg), 245 }, - { SCMP_SYS(sendmsg), 245 }, - { SCMP_SYS(accept), 245 }, - { SCMP_SYS(connect), 245 }, - { SCMP_SYS(socketpair), 245 }, - { SCMP_SYS(bind), 245 }, - { SCMP_SYS(listen), 245 }, - { SCMP_SYS(semget), 245 }, - { SCMP_SYS(ipc), 245 }, - { SCMP_SYS(gettimeofday), 245 }, - { SCMP_SYS(readlink), 245 }, - { SCMP_SYS(access), 245 }, - { SCMP_SYS(prctl), 245 }, - { SCMP_SYS(signalfd), 245 }, - { SCMP_SYS(getrlimit), 245 }, - { SCMP_SYS(getrusage), 245 }, - { SCMP_SYS(set_tid_address), 245 }, - { SCMP_SYS(statfs), 245 }, - { SCMP_SYS(unlink), 245 }, - { SCMP_SYS(wait4), 245 }, - { SCMP_SYS(fcntl64), 245 }, - { SCMP_SYS(fstat64), 245 }, - { SCMP_SYS(stat64), 245 }, - { SCMP_SYS(getgid32), 245 }, - { SCMP_SYS(getegid32), 245 }, - { SCMP_SYS(getuid32), 245 }, - { SCMP_SYS(geteuid32), 245 }, - { SCMP_SYS(sigreturn), 245 }, - { SCMP_SYS(_newselect), 245 }, - { SCMP_SYS(_llseek), 245 }, - { SCMP_SYS(mmap2), 245 }, - { SCMP_SYS(sigprocmask), 245 }, - { SCMP_SYS(sched_getparam), 245 }, - { SCMP_SYS(sched_getscheduler), 245 }, - { SCMP_SYS(fstat), 245 }, - { SCMP_SYS(clock_getres), 245 }, - { SCMP_SYS(sched_get_priority_min), 245 }, - { SCMP_SYS(sched_get_priority_max), 245 }, - { SCMP_SYS(stat), 245 }, - { SCMP_SYS(uname), 245 }, - { SCMP_SYS(eventfd2), 245 }, - { SCMP_SYS(io_getevents), 245 }, - { SCMP_SYS(dup), 245 }, - { SCMP_SYS(dup2), 245 }, - { SCMP_SYS(dup3), 245 }, - { SCMP_SYS(gettid), 245 }, - { SCMP_SYS(getgid), 245 }, - { SCMP_SYS(getegid), 245 }, - { SCMP_SYS(getuid), 245 }, - { SCMP_SYS(geteuid), 245 }, - { SCMP_SYS(timer_create), 245 }, - { SCMP_SYS(times), 245 }, - { SCMP_SYS(exit), 245 }, - { SCMP_SYS(clock_gettime), 245 }, - { SCMP_SYS(time), 245 }, - { SCMP_SYS(restart_syscall), 245 }, - { SCMP_SYS(pwrite64), 245 }, - { SCMP_SYS(nanosleep), 245 }, - { SCMP_SYS(chown), 245 }, - { SCMP_SYS(openat), 245 }, - { SCMP_SYS(getdents), 245 }, - { SCMP_SYS(timer_delete), 245 }, - { SCMP_SYS(exit_group), 245 }, - { SCMP_SYS(rt_sigreturn), 245 }, - { SCMP_SYS(sync), 245 }, - { SCMP_SYS(pread64), 245 }, - { SCMP_SYS(madvise), 245 }, - { SCMP_SYS(set_robust_list), 245 }, - { SCMP_SYS(lseek), 245 }, - { SCMP_SYS(pselect6), 245 }, - { SCMP_SYS(fork), 245 }, - { SCMP_SYS(rt_sigprocmask), 245 }, - { SCMP_SYS(write), 244 }, - { SCMP_SYS(fcntl), 243 }, - { SCMP_SYS(tgkill), 242 }, - { SCMP_SYS(kill), 242 }, - { SCMP_SYS(rt_sigaction), 242 }, - { SCMP_SYS(pipe2), 242 }, - { SCMP_SYS(munmap), 242 }, - { SCMP_SYS(mremap), 242 }, - { SCMP_SYS(fdatasync), 242 }, - { SCMP_SYS(close), 242 }, - { SCMP_SYS(rt_sigpending), 242 }, - { SCMP_SYS(rt_sigtimedwait), 242 }, - { SCMP_SYS(readv), 242 }, - { SCMP_SYS(writev), 242 }, - { SCMP_SYS(preadv), 242 }, - { SCMP_SYS(pwritev), 242 }, - { SCMP_SYS(setrlimit), 242 }, - { SCMP_SYS(ftruncate), 242 }, - { SCMP_SYS(lstat), 242 }, - { SCMP_SYS(pipe), 242 }, - { SCMP_SYS(umask), 242 }, - { SCMP_SYS(chdir), 242 }, - { SCMP_SYS(setitimer), 242 }, - { SCMP_SYS(setsid), 242 }, - { SCMP_SYS(poll), 242 }, - { SCMP_SYS(epoll_create), 242 }, - { SCMP_SYS(epoll_ctl), 242 }, - { SCMP_SYS(epoll_wait), 242 }, - { SCMP_SYS(waitpid), 242 }, - { SCMP_SYS(getsockname), 242 }, - { SCMP_SYS(getpeername), 242 }, - { SCMP_SYS(accept4), 242 }, - { SCMP_SYS(timerfd_settime), 242 }, - { SCMP_SYS(newfstatat), 241 }, - { SCMP_SYS(shutdown), 241 }, - { SCMP_SYS(getsockopt), 241 }, - { SCMP_SYS(semop), 241 }, - { SCMP_SYS(semtimedop), 241 }, - { SCMP_SYS(epoll_ctl_old), 241 }, - { SCMP_SYS(epoll_wait_old), 241 }, - { SCMP_SYS(epoll_pwait), 241 }, - { SCMP_SYS(epoll_create1), 241 }, - { SCMP_SYS(ppoll), 241 }, - { SCMP_SYS(creat), 241 }, - { SCMP_SYS(link), 241 }, - { SCMP_SYS(getpid), 241 }, - { SCMP_SYS(getppid), 241 }, - { SCMP_SYS(getpgrp), 241 }, - { SCMP_SYS(getpgid), 241 }, - { SCMP_SYS(getsid), 241 }, - { SCMP_SYS(getdents64), 241 }, - { SCMP_SYS(getresuid), 241 }, - { SCMP_SYS(getresgid), 241 }, - { SCMP_SYS(getgroups), 241 }, - { SCMP_SYS(getresuid32), 241 }, - { SCMP_SYS(getresgid32), 241 }, - { SCMP_SYS(getgroups32), 241 }, - { SCMP_SYS(signal), 241 }, - { SCMP_SYS(sigaction), 241 }, - { SCMP_SYS(sigsuspend), 241 }, - { SCMP_SYS(sigpending), 241 }, - { SCMP_SYS(truncate64), 241 }, - { SCMP_SYS(ftruncate64), 241 }, - { SCMP_SYS(fchown32), 241 }, - { SCMP_SYS(chown32), 241 }, - { SCMP_SYS(lchown32), 241 }, - { SCMP_SYS(statfs64), 241 }, - { SCMP_SYS(fstatfs64), 241 }, - { SCMP_SYS(fstatat64), 241 }, - { SCMP_SYS(lstat64), 241 }, - { SCMP_SYS(sendfile64), 241 }, - { SCMP_SYS(ugetrlimit), 241 }, - { SCMP_SYS(alarm), 241 }, - { SCMP_SYS(rt_sigsuspend), 241 }, - { SCMP_SYS(rt_sigqueueinfo), 241 }, - { SCMP_SYS(rt_tgsigqueueinfo), 241 }, - { SCMP_SYS(sigaltstack), 241 }, - { SCMP_SYS(signalfd4), 241 }, - { SCMP_SYS(truncate), 241 }, - { SCMP_SYS(fchown), 241 }, - { SCMP_SYS(lchown), 241 }, - { SCMP_SYS(fchownat), 241 }, - { SCMP_SYS(fstatfs), 241 }, - { SCMP_SYS(getitimer), 241 }, - { SCMP_SYS(syncfs), 241 }, - { SCMP_SYS(fsync), 241 }, - { SCMP_SYS(fchdir), 241 }, - { SCMP_SYS(msync), 241 }, - { SCMP_SYS(sched_setparam), 241 }, - { SCMP_SYS(sched_setscheduler), 241 }, - { SCMP_SYS(sched_yield), 241 }, - { SCMP_SYS(sched_rr_get_interval), 241 }, - { SCMP_SYS(sched_setaffinity), 241 }, - { SCMP_SYS(sched_getaffinity), 241 }, - { SCMP_SYS(readahead), 241 }, - { SCMP_SYS(timer_getoverrun), 241 }, - { SCMP_SYS(unlinkat), 241 }, - { SCMP_SYS(readlinkat), 241 }, - { SCMP_SYS(faccessat), 241 }, - { SCMP_SYS(get_robust_list), 241 }, - { SCMP_SYS(splice), 241 }, - { SCMP_SYS(vmsplice), 241 }, - { SCMP_SYS(getcpu), 241 }, - { SCMP_SYS(sendmmsg), 241 }, - { SCMP_SYS(recvmmsg), 241 }, - { SCMP_SYS(prlimit64), 241 }, - { SCMP_SYS(waitid), 241 }, - { SCMP_SYS(io_cancel), 241 }, - { SCMP_SYS(io_setup), 241 }, - { SCMP_SYS(io_destroy), 241 }, - { SCMP_SYS(arch_prctl), 240 }, - { SCMP_SYS(mkdir), 240 }, - { SCMP_SYS(fchmod), 240 }, - { SCMP_SYS(shmget), 240 }, - { SCMP_SYS(shmat), 240 }, - { SCMP_SYS(shmdt), 240 }, - { SCMP_SYS(timerfd_create), 240 }, - { SCMP_SYS(shmctl), 240 }, - { SCMP_SYS(mlockall), 240 }, - { SCMP_SYS(mlock), 240 }, - { SCMP_SYS(munlock), 240 }, - { SCMP_SYS(semctl), 240 }, - { SCMP_SYS(fallocate), 240 }, - { SCMP_SYS(fadvise64), 240 }, - { SCMP_SYS(inotify_init1), 240 }, - { SCMP_SYS(inotify_add_watch), 240 }, - { SCMP_SYS(mbind), 240 }, - { SCMP_SYS(memfd_create), 240 }, -#ifdef HAVE_CACHEFLUSH - { SCMP_SYS(cacheflush), 240 }, -#endif - { SCMP_SYS(sysinfo), 240 }, +static const struct QemuSeccompSyscall blacklist[] = { + { SCMP_SYS(reboot), 255 }, + { SCMP_SYS(swapon), 255 }, + { SCMP_SYS(swapoff), 255 }, + { SCMP_SYS(syslog), 255 }, + { SCMP_SYS(mount), 255 }, + { SCMP_SYS(umount), 255 }, + { SCMP_SYS(kexec_load), 255 }, + { SCMP_SYS(afs_syscall), 255 }, + { SCMP_SYS(break), 255 }, + { SCMP_SYS(ftime), 255 }, + { SCMP_SYS(getpmsg), 255 }, + { SCMP_SYS(gtty), 255 }, + { SCMP_SYS(lock), 255 }, + { SCMP_SYS(mpx), 255 }, + { SCMP_SYS(prof), 255 }, + { SCMP_SYS(profil), 255 }, + { SCMP_SYS(putpmsg), 255 }, + { SCMP_SYS(security), 255 }, + { SCMP_SYS(stty), 255 }, + { SCMP_SYS(tuxcall), 255 }, + { SCMP_SYS(ulimit), 255 }, + { SCMP_SYS(vserver), 255 }, }; int seccomp_start(void) @@ -262,19 +62,19 @@ int seccomp_start(void) unsigned int i = 0; scmp_filter_ctx ctx; - ctx = seccomp_init(SCMP_ACT_KILL); + ctx = seccomp_init(SCMP_ACT_ALLOW); if (ctx == NULL) { rc = -1; goto seccomp_return; } - for (i = 0; i < ARRAY_SIZE(seccomp_whitelist); i++) { - rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, seccomp_whitelist[i].num, 0); + for (i = 0; i < ARRAY_SIZE(blacklist); i++) { + rc = seccomp_rule_add(ctx, SCMP_ACT_KILL, blacklist[i].num, 0); if (rc < 0) { goto seccomp_return; } - rc = seccomp_syscall_priority(ctx, seccomp_whitelist[i].num, - seccomp_whitelist[i].priority); + rc = seccomp_syscall_priority(ctx, blacklist[i].num, + blacklist[i].priority); if (rc < 0) { goto seccomp_return; } diff --git a/vl.c b/vl.c index 8efd48bf9f..838ad3b11a 100644 --- a/vl.c +++ b/vl.c @@ -1030,14 +1030,17 @@ static int bt_parse(const char *opt) static int parse_sandbox(void *opaque, QemuOpts *opts, Error **errp) { - /* FIXME: change this to true for 1.3 */ if (qemu_opt_get_bool(opts, "enable", false)) { #ifdef CONFIG_SECCOMP if (seccomp_start() < 0) { error_report("failed to install seccomp syscall filter " "in the kernel"); return -1; - } + } else { + error_report("warning: -sandbox on has been converted to blacklist + approach. Refer to manual for other options to higher + security option."); + } #else error_report("seccomp support is disabled"); return -1;