mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-30 15:00:34 +00:00
24f8cdc572
This patch adds [,resourcecontrol=deny] to `-sandbox on' option. It blacklists all process affinity and scheduler priority system calls to avoid any bigger of the process. Signed-off-by: Eduardo Otubo <otubo@redhat.com>
128 lines
5.4 KiB
C
128 lines
5.4 KiB
C
/*
|
|
* QEMU seccomp mode 2 support with libseccomp
|
|
*
|
|
* Copyright IBM, Corp. 2012
|
|
*
|
|
* Authors:
|
|
* Eduardo Otubo <eotubo@br.ibm.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
* Contributions after 2012-01-13 are licensed under the terms of the
|
|
* GNU GPL, version 2 or (at your option) any later version.
|
|
*/
|
|
#include "qemu/osdep.h"
|
|
#include <seccomp.h>
|
|
#include "sysemu/seccomp.h"
|
|
|
|
/* For some architectures (notably ARM) cacheflush is not supported until
|
|
* libseccomp 2.2.3, but configure enforces that we are using a more recent
|
|
* version on those hosts, so it is OK for this check to be less strict.
|
|
*/
|
|
#if SCMP_VER_MAJOR >= 3
|
|
#define HAVE_CACHEFLUSH
|
|
#elif SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR >= 2
|
|
#define HAVE_CACHEFLUSH
|
|
#endif
|
|
|
|
struct QemuSeccompSyscall {
|
|
int32_t num;
|
|
uint8_t set;
|
|
};
|
|
|
|
static const struct QemuSeccompSyscall blacklist[] = {
|
|
/* default set of syscalls to blacklist */
|
|
{ SCMP_SYS(reboot), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(swapon), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(swapoff), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(syslog), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(mount), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(umount), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(kexec_load), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(afs_syscall), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(break), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(ftime), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(getpmsg), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(gtty), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(lock), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(mpx), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(prof), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(profil), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(putpmsg), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(security), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(stty), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(tuxcall), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(ulimit), QEMU_SECCOMP_SET_DEFAULT },
|
|
{ SCMP_SYS(vserver), QEMU_SECCOMP_SET_DEFAULT },
|
|
/* obsolete */
|
|
{ SCMP_SYS(readdir), QEMU_SECCOMP_SET_OBSOLETE },
|
|
{ SCMP_SYS(_sysctl), QEMU_SECCOMP_SET_OBSOLETE },
|
|
{ SCMP_SYS(bdflush), QEMU_SECCOMP_SET_OBSOLETE },
|
|
{ SCMP_SYS(create_module), QEMU_SECCOMP_SET_OBSOLETE },
|
|
{ SCMP_SYS(get_kernel_syms), QEMU_SECCOMP_SET_OBSOLETE },
|
|
{ SCMP_SYS(query_module), QEMU_SECCOMP_SET_OBSOLETE },
|
|
{ SCMP_SYS(sgetmask), QEMU_SECCOMP_SET_OBSOLETE },
|
|
{ SCMP_SYS(ssetmask), QEMU_SECCOMP_SET_OBSOLETE },
|
|
{ SCMP_SYS(sysfs), QEMU_SECCOMP_SET_OBSOLETE },
|
|
{ SCMP_SYS(uselib), QEMU_SECCOMP_SET_OBSOLETE },
|
|
{ SCMP_SYS(ustat), QEMU_SECCOMP_SET_OBSOLETE },
|
|
/* privileged */
|
|
{ SCMP_SYS(setuid), QEMU_SECCOMP_SET_PRIVILEGED },
|
|
{ SCMP_SYS(setgid), QEMU_SECCOMP_SET_PRIVILEGED },
|
|
{ SCMP_SYS(setpgid), QEMU_SECCOMP_SET_PRIVILEGED },
|
|
{ SCMP_SYS(setsid), QEMU_SECCOMP_SET_PRIVILEGED },
|
|
{ SCMP_SYS(setreuid), QEMU_SECCOMP_SET_PRIVILEGED },
|
|
{ SCMP_SYS(setregid), QEMU_SECCOMP_SET_PRIVILEGED },
|
|
{ SCMP_SYS(setresuid), QEMU_SECCOMP_SET_PRIVILEGED },
|
|
{ SCMP_SYS(setresgid), QEMU_SECCOMP_SET_PRIVILEGED },
|
|
{ SCMP_SYS(setfsuid), QEMU_SECCOMP_SET_PRIVILEGED },
|
|
{ SCMP_SYS(setfsgid), QEMU_SECCOMP_SET_PRIVILEGED },
|
|
/* spawn */
|
|
{ SCMP_SYS(fork), QEMU_SECCOMP_SET_SPAWN },
|
|
{ SCMP_SYS(vfork), QEMU_SECCOMP_SET_SPAWN },
|
|
{ SCMP_SYS(execve), QEMU_SECCOMP_SET_SPAWN },
|
|
/* resource control */
|
|
{ SCMP_SYS(getpriority), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
{ SCMP_SYS(setpriority), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
{ SCMP_SYS(sched_setparam), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
{ SCMP_SYS(sched_getparam), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
{ SCMP_SYS(sched_setscheduler), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
{ SCMP_SYS(sched_getscheduler), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
{ SCMP_SYS(sched_setaffinity), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
{ SCMP_SYS(sched_getaffinity), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
{ SCMP_SYS(sched_get_priority_max), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
{ SCMP_SYS(sched_get_priority_min), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
};
|
|
|
|
|
|
int seccomp_start(uint32_t seccomp_opts)
|
|
{
|
|
int rc = 0;
|
|
unsigned int i = 0;
|
|
scmp_filter_ctx ctx;
|
|
|
|
ctx = seccomp_init(SCMP_ACT_ALLOW);
|
|
if (ctx == NULL) {
|
|
rc = -1;
|
|
goto seccomp_return;
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(blacklist); i++) {
|
|
if (!(seccomp_opts & blacklist[i].set)) {
|
|
continue;
|
|
}
|
|
|
|
rc = seccomp_rule_add(ctx, SCMP_ACT_KILL, blacklist[i].num, 0);
|
|
if (rc < 0) {
|
|
goto seccomp_return;
|
|
}
|
|
}
|
|
|
|
rc = seccomp_load(ctx);
|
|
|
|
seccomp_return:
|
|
seccomp_release(ctx);
|
|
return rc;
|
|
}
|