18d7f2e76SPhilippe Mathieu-Daudé /* 28d7f2e76SPhilippe Mathieu-Daudé * QEMU seccomp mode 2 support with libseccomp 38d7f2e76SPhilippe Mathieu-Daudé * 48d7f2e76SPhilippe Mathieu-Daudé * Copyright IBM, Corp. 2012 58d7f2e76SPhilippe Mathieu-Daudé * 68d7f2e76SPhilippe Mathieu-Daudé * Authors: 78d7f2e76SPhilippe Mathieu-Daudé * Eduardo Otubo <eotubo@br.ibm.com> 88d7f2e76SPhilippe Mathieu-Daudé * 98d7f2e76SPhilippe Mathieu-Daudé * This work is licensed under the terms of the GNU GPL, version 2. See 108d7f2e76SPhilippe Mathieu-Daudé * the COPYING file in the top-level directory. 118d7f2e76SPhilippe Mathieu-Daudé * 128d7f2e76SPhilippe Mathieu-Daudé * Contributions after 2012-01-13 are licensed under the terms of the 138d7f2e76SPhilippe Mathieu-Daudé * GNU GPL, version 2 or (at your option) any later version. 148d7f2e76SPhilippe Mathieu-Daudé */ 158d7f2e76SPhilippe Mathieu-Daudé 168d7f2e76SPhilippe Mathieu-Daudé #include "qemu/osdep.h" 178d7f2e76SPhilippe Mathieu-Daudé #include "qapi/error.h" 188d7f2e76SPhilippe Mathieu-Daudé #include "qemu/config-file.h" 198d7f2e76SPhilippe Mathieu-Daudé #include "qemu/option.h" 208d7f2e76SPhilippe Mathieu-Daudé #include "qemu/module.h" 218d7f2e76SPhilippe Mathieu-Daudé #include <sys/prctl.h> 228d7f2e76SPhilippe Mathieu-Daudé #include <seccomp.h> 238d7f2e76SPhilippe Mathieu-Daudé #include "sysemu/seccomp.h" 248d7f2e76SPhilippe Mathieu-Daudé #include <linux/seccomp.h> 258d7f2e76SPhilippe Mathieu-Daudé 268d7f2e76SPhilippe Mathieu-Daudé /* For some architectures (notably ARM) cacheflush is not supported until 278d7f2e76SPhilippe Mathieu-Daudé * libseccomp 2.2.3, but configure enforces that we are using a more recent 288d7f2e76SPhilippe Mathieu-Daudé * version on those hosts, so it is OK for this check to be less strict. 298d7f2e76SPhilippe Mathieu-Daudé */ 308d7f2e76SPhilippe Mathieu-Daudé #if SCMP_VER_MAJOR >= 3 318d7f2e76SPhilippe Mathieu-Daudé #define HAVE_CACHEFLUSH 328d7f2e76SPhilippe Mathieu-Daudé #elif SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR >= 2 338d7f2e76SPhilippe Mathieu-Daudé #define HAVE_CACHEFLUSH 348d7f2e76SPhilippe Mathieu-Daudé #endif 358d7f2e76SPhilippe Mathieu-Daudé 368d7f2e76SPhilippe Mathieu-Daudé struct QemuSeccompSyscall { 378d7f2e76SPhilippe Mathieu-Daudé int32_t num; 388d7f2e76SPhilippe Mathieu-Daudé uint8_t set; 398d7f2e76SPhilippe Mathieu-Daudé uint8_t narg; 408d7f2e76SPhilippe Mathieu-Daudé const struct scmp_arg_cmp *arg_cmp; 418d7f2e76SPhilippe Mathieu-Daudé uint32_t action; 428d7f2e76SPhilippe Mathieu-Daudé }; 438d7f2e76SPhilippe Mathieu-Daudé 448d7f2e76SPhilippe Mathieu-Daudé const struct scmp_arg_cmp sched_setscheduler_arg[] = { 458d7f2e76SPhilippe Mathieu-Daudé /* was SCMP_A1(SCMP_CMP_NE, SCHED_IDLE), but expanded due to GCC 4.x bug */ 468d7f2e76SPhilippe Mathieu-Daudé { .arg = 1, .op = SCMP_CMP_NE, .datum_a = SCHED_IDLE } 478d7f2e76SPhilippe Mathieu-Daudé }; 488d7f2e76SPhilippe Mathieu-Daudé 498d7f2e76SPhilippe Mathieu-Daudé /* 508d7f2e76SPhilippe Mathieu-Daudé * See 'NOTES' in 'man 2 clone' - s390 & cross have 'flags' in 518d7f2e76SPhilippe Mathieu-Daudé * different position to other architectures 528d7f2e76SPhilippe Mathieu-Daudé */ 538d7f2e76SPhilippe Mathieu-Daudé #if defined(HOST_S390X) || defined(HOST_S390) || defined(HOST_CRIS) 548d7f2e76SPhilippe Mathieu-Daudé #define CLONE_FLAGS_ARG 1 558d7f2e76SPhilippe Mathieu-Daudé #else 568d7f2e76SPhilippe Mathieu-Daudé #define CLONE_FLAGS_ARG 0 578d7f2e76SPhilippe Mathieu-Daudé #endif 588d7f2e76SPhilippe Mathieu-Daudé 598d7f2e76SPhilippe Mathieu-Daudé #ifndef CLONE_PIDFD 608d7f2e76SPhilippe Mathieu-Daudé # define CLONE_PIDFD 0x00001000 618d7f2e76SPhilippe Mathieu-Daudé #endif 628d7f2e76SPhilippe Mathieu-Daudé 638d7f2e76SPhilippe Mathieu-Daudé #define REQUIRE_CLONE_FLAG(flag) \ 648d7f2e76SPhilippe Mathieu-Daudé const struct scmp_arg_cmp clone_arg ## flag[] = { \ 658d7f2e76SPhilippe Mathieu-Daudé { .arg = CLONE_FLAGS_ARG, \ 668d7f2e76SPhilippe Mathieu-Daudé .op = SCMP_CMP_MASKED_EQ, \ 678d7f2e76SPhilippe Mathieu-Daudé .datum_a = flag, .datum_b = 0 } } 688d7f2e76SPhilippe Mathieu-Daudé 698d7f2e76SPhilippe Mathieu-Daudé #define FORBID_CLONE_FLAG(flag) \ 708d7f2e76SPhilippe Mathieu-Daudé const struct scmp_arg_cmp clone_arg ## flag[] = { \ 718d7f2e76SPhilippe Mathieu-Daudé { .arg = CLONE_FLAGS_ARG, \ 728d7f2e76SPhilippe Mathieu-Daudé .op = SCMP_CMP_MASKED_EQ, \ 738d7f2e76SPhilippe Mathieu-Daudé .datum_a = flag, .datum_b = flag } } 748d7f2e76SPhilippe Mathieu-Daudé 758d7f2e76SPhilippe Mathieu-Daudé #define RULE_CLONE_FLAG(flag) \ 768d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(clone), QEMU_SECCOMP_SET_SPAWN, \ 778d7f2e76SPhilippe Mathieu-Daudé ARRAY_SIZE(clone_arg ## flag), clone_arg ## flag, SCMP_ACT_TRAP } 788d7f2e76SPhilippe Mathieu-Daudé 798d7f2e76SPhilippe Mathieu-Daudé /* If no CLONE_* flags are set, except CSIGNAL, deny */ 808d7f2e76SPhilippe Mathieu-Daudé const struct scmp_arg_cmp clone_arg_none[] = { 818d7f2e76SPhilippe Mathieu-Daudé { .arg = CLONE_FLAGS_ARG, 828d7f2e76SPhilippe Mathieu-Daudé .op = SCMP_CMP_MASKED_EQ, 838d7f2e76SPhilippe Mathieu-Daudé .datum_a = ~(CSIGNAL), .datum_b = 0 } 848d7f2e76SPhilippe Mathieu-Daudé }; 858d7f2e76SPhilippe Mathieu-Daudé 868d7f2e76SPhilippe Mathieu-Daudé /* 878d7f2e76SPhilippe Mathieu-Daudé * pthread_create should always set all of these. 888d7f2e76SPhilippe Mathieu-Daudé */ 898d7f2e76SPhilippe Mathieu-Daudé REQUIRE_CLONE_FLAG(CLONE_VM); 908d7f2e76SPhilippe Mathieu-Daudé REQUIRE_CLONE_FLAG(CLONE_FS); 918d7f2e76SPhilippe Mathieu-Daudé REQUIRE_CLONE_FLAG(CLONE_FILES); 928d7f2e76SPhilippe Mathieu-Daudé REQUIRE_CLONE_FLAG(CLONE_SIGHAND); 938d7f2e76SPhilippe Mathieu-Daudé REQUIRE_CLONE_FLAG(CLONE_THREAD); 948d7f2e76SPhilippe Mathieu-Daudé REQUIRE_CLONE_FLAG(CLONE_SYSVSEM); 958d7f2e76SPhilippe Mathieu-Daudé REQUIRE_CLONE_FLAG(CLONE_SETTLS); 968d7f2e76SPhilippe Mathieu-Daudé REQUIRE_CLONE_FLAG(CLONE_PARENT_SETTID); 978d7f2e76SPhilippe Mathieu-Daudé REQUIRE_CLONE_FLAG(CLONE_CHILD_CLEARTID); 988d7f2e76SPhilippe Mathieu-Daudé /* 998d7f2e76SPhilippe Mathieu-Daudé * Musl sets this in pthread_create too, but it is 1008d7f2e76SPhilippe Mathieu-Daudé * obsolete and harmless since its behaviour is 1018d7f2e76SPhilippe Mathieu-Daudé * subsumed under CLONE_THREAD 1028d7f2e76SPhilippe Mathieu-Daudé */ 1038d7f2e76SPhilippe Mathieu-Daudé /*REQUIRE_CLONE_FLAG(CLONE_DETACHED);*/ 1048d7f2e76SPhilippe Mathieu-Daudé 1058d7f2e76SPhilippe Mathieu-Daudé 1068d7f2e76SPhilippe Mathieu-Daudé /* 1078d7f2e76SPhilippe Mathieu-Daudé * These all indicate an attempt to spawn a process 1088d7f2e76SPhilippe Mathieu-Daudé * instead of a thread, or other undesirable scenarios 1098d7f2e76SPhilippe Mathieu-Daudé */ 1108d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_PIDFD); 1118d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_PTRACE); 1128d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_VFORK); 1138d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_PARENT); 1148d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_NEWNS); 1158d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_UNTRACED); 1168d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_NEWCGROUP); 1178d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_NEWUTS); 1188d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_NEWIPC); 1198d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_NEWUSER); 1208d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_NEWPID); 1218d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_NEWNET); 1228d7f2e76SPhilippe Mathieu-Daudé FORBID_CLONE_FLAG(CLONE_IO); 1238d7f2e76SPhilippe Mathieu-Daudé 1248d7f2e76SPhilippe Mathieu-Daudé 1258d7f2e76SPhilippe Mathieu-Daudé static const struct QemuSeccompSyscall denylist[] = { 1268d7f2e76SPhilippe Mathieu-Daudé /* default set of syscalls that should get blocked */ 1278d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(reboot), QEMU_SECCOMP_SET_DEFAULT, 1288d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1298d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(swapon), QEMU_SECCOMP_SET_DEFAULT, 1308d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1318d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(swapoff), QEMU_SECCOMP_SET_DEFAULT, 1328d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1338d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(syslog), QEMU_SECCOMP_SET_DEFAULT, 1348d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1358d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(mount), QEMU_SECCOMP_SET_DEFAULT, 1368d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1378d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(umount), QEMU_SECCOMP_SET_DEFAULT, 1388d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1398d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(kexec_load), QEMU_SECCOMP_SET_DEFAULT, 1408d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1418d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(afs_syscall), QEMU_SECCOMP_SET_DEFAULT, 1428d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1438d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(break), QEMU_SECCOMP_SET_DEFAULT, 1448d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1458d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(ftime), QEMU_SECCOMP_SET_DEFAULT, 1468d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1478d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(getpmsg), QEMU_SECCOMP_SET_DEFAULT, 1488d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1498d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(gtty), QEMU_SECCOMP_SET_DEFAULT, 1508d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1518d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(lock), QEMU_SECCOMP_SET_DEFAULT, 1528d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1538d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(mpx), QEMU_SECCOMP_SET_DEFAULT, 1548d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1558d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(prof), QEMU_SECCOMP_SET_DEFAULT, 1568d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1578d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(profil), QEMU_SECCOMP_SET_DEFAULT, 1588d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1598d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(putpmsg), QEMU_SECCOMP_SET_DEFAULT, 1608d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1618d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(security), QEMU_SECCOMP_SET_DEFAULT, 1628d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1638d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(stty), QEMU_SECCOMP_SET_DEFAULT, 1648d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1658d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(tuxcall), QEMU_SECCOMP_SET_DEFAULT, 1668d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1678d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(ulimit), QEMU_SECCOMP_SET_DEFAULT, 1688d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1698d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(vserver), QEMU_SECCOMP_SET_DEFAULT, 1708d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1718d7f2e76SPhilippe Mathieu-Daudé /* obsolete */ 1728d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(readdir), QEMU_SECCOMP_SET_OBSOLETE, 1738d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1748d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(_sysctl), QEMU_SECCOMP_SET_OBSOLETE, 1758d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1768d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(bdflush), QEMU_SECCOMP_SET_OBSOLETE, 1778d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1788d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(create_module), QEMU_SECCOMP_SET_OBSOLETE, 1798d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1808d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(get_kernel_syms), QEMU_SECCOMP_SET_OBSOLETE, 1818d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1828d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(query_module), QEMU_SECCOMP_SET_OBSOLETE, 1838d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1848d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(sgetmask), QEMU_SECCOMP_SET_OBSOLETE, 1858d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1868d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(ssetmask), QEMU_SECCOMP_SET_OBSOLETE, 1878d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1888d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(sysfs), QEMU_SECCOMP_SET_OBSOLETE, 1898d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1908d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(uselib), QEMU_SECCOMP_SET_OBSOLETE, 1918d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1928d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(ustat), QEMU_SECCOMP_SET_OBSOLETE, 1938d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1948d7f2e76SPhilippe Mathieu-Daudé /* privileged */ 1958d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setuid), QEMU_SECCOMP_SET_PRIVILEGED, 1968d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1978d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setgid), QEMU_SECCOMP_SET_PRIVILEGED, 1988d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 1998d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setpgid), QEMU_SECCOMP_SET_PRIVILEGED, 2008d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2018d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setsid), QEMU_SECCOMP_SET_PRIVILEGED, 2028d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2038d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setreuid), QEMU_SECCOMP_SET_PRIVILEGED, 2048d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2058d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setregid), QEMU_SECCOMP_SET_PRIVILEGED, 2068d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2078d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setresuid), QEMU_SECCOMP_SET_PRIVILEGED, 2088d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2098d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setresgid), QEMU_SECCOMP_SET_PRIVILEGED, 2108d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2118d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setfsuid), QEMU_SECCOMP_SET_PRIVILEGED, 2128d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2138d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setfsgid), QEMU_SECCOMP_SET_PRIVILEGED, 2148d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2158d7f2e76SPhilippe Mathieu-Daudé /* spawn */ 2168d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(fork), QEMU_SECCOMP_SET_SPAWN, 2178d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2188d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(vfork), QEMU_SECCOMP_SET_SPAWN, 2198d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2208d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(execve), QEMU_SECCOMP_SET_SPAWN, 2218d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_TRAP }, 2228d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(clone), QEMU_SECCOMP_SET_SPAWN, 2238d7f2e76SPhilippe Mathieu-Daudé ARRAY_SIZE(clone_arg_none), clone_arg_none, SCMP_ACT_TRAP }, 2248d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_VM), 2258d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_FS), 2268d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_FILES), 2278d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_SIGHAND), 2288d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_THREAD), 2298d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_SYSVSEM), 2308d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_SETTLS), 2318d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_PARENT_SETTID), 2328d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_CHILD_CLEARTID), 2338d7f2e76SPhilippe Mathieu-Daudé /*RULE_CLONE_FLAG(CLONE_DETACHED),*/ 2348d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_PIDFD), 2358d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_PTRACE), 2368d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_VFORK), 2378d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_PARENT), 2388d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_NEWNS), 2398d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_UNTRACED), 2408d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_NEWCGROUP), 2418d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_NEWUTS), 2428d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_NEWIPC), 2438d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_NEWUSER), 2448d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_NEWPID), 2458d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_NEWNET), 2468d7f2e76SPhilippe Mathieu-Daudé RULE_CLONE_FLAG(CLONE_IO), 2478d7f2e76SPhilippe Mathieu-Daudé #ifdef __SNR_clone3 2488d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(clone3), QEMU_SECCOMP_SET_SPAWN, 2498d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_ERRNO(ENOSYS) }, 2508d7f2e76SPhilippe Mathieu-Daudé #endif 2518d7f2e76SPhilippe Mathieu-Daudé #ifdef __SNR_execveat 2528d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(execveat), QEMU_SECCOMP_SET_SPAWN }, 2538d7f2e76SPhilippe Mathieu-Daudé #endif 2548d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setns), QEMU_SECCOMP_SET_SPAWN }, 2558d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(unshare), QEMU_SECCOMP_SET_SPAWN }, 2568d7f2e76SPhilippe Mathieu-Daudé /* resource control */ 2578d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(setpriority), QEMU_SECCOMP_SET_RESOURCECTL, 2588d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_ERRNO(EPERM) }, 2598d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(sched_setparam), QEMU_SECCOMP_SET_RESOURCECTL, 2608d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_ERRNO(EPERM) }, 2618d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(sched_setscheduler), QEMU_SECCOMP_SET_RESOURCECTL, 2628d7f2e76SPhilippe Mathieu-Daudé ARRAY_SIZE(sched_setscheduler_arg), sched_setscheduler_arg, 2638d7f2e76SPhilippe Mathieu-Daudé SCMP_ACT_ERRNO(EPERM) }, 2648d7f2e76SPhilippe Mathieu-Daudé { SCMP_SYS(sched_setaffinity), QEMU_SECCOMP_SET_RESOURCECTL, 2658d7f2e76SPhilippe Mathieu-Daudé 0, NULL, SCMP_ACT_ERRNO(EPERM) }, 2668d7f2e76SPhilippe Mathieu-Daudé }; 2678d7f2e76SPhilippe Mathieu-Daudé 2688d7f2e76SPhilippe Mathieu-Daudé static inline __attribute__((unused)) int 2698d7f2e76SPhilippe Mathieu-Daudé qemu_seccomp(unsigned int operation, unsigned int flags, void *args) 2708d7f2e76SPhilippe Mathieu-Daudé { 2718d7f2e76SPhilippe Mathieu-Daudé #ifdef __NR_seccomp 2728d7f2e76SPhilippe Mathieu-Daudé return syscall(__NR_seccomp, operation, flags, args); 2738d7f2e76SPhilippe Mathieu-Daudé #else 2748d7f2e76SPhilippe Mathieu-Daudé errno = ENOSYS; 2758d7f2e76SPhilippe Mathieu-Daudé return -1; 2768d7f2e76SPhilippe Mathieu-Daudé #endif 2778d7f2e76SPhilippe Mathieu-Daudé } 2788d7f2e76SPhilippe Mathieu-Daudé 2798d7f2e76SPhilippe Mathieu-Daudé static uint32_t qemu_seccomp_update_action(uint32_t action) 2808d7f2e76SPhilippe Mathieu-Daudé { 2818d7f2e76SPhilippe Mathieu-Daudé #if defined(SECCOMP_GET_ACTION_AVAIL) && defined(SCMP_ACT_KILL_PROCESS) && \ 2828d7f2e76SPhilippe Mathieu-Daudé defined(SECCOMP_RET_KILL_PROCESS) 2838d7f2e76SPhilippe Mathieu-Daudé if (action == SCMP_ACT_TRAP) { 2848d7f2e76SPhilippe Mathieu-Daudé static int kill_process = -1; 2858d7f2e76SPhilippe Mathieu-Daudé if (kill_process == -1) { 2868d7f2e76SPhilippe Mathieu-Daudé uint32_t testaction = SECCOMP_RET_KILL_PROCESS; 2878d7f2e76SPhilippe Mathieu-Daudé 2888d7f2e76SPhilippe Mathieu-Daudé if (qemu_seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &testaction) == 0) { 2898d7f2e76SPhilippe Mathieu-Daudé kill_process = 1; 2908d7f2e76SPhilippe Mathieu-Daudé } else { 2918d7f2e76SPhilippe Mathieu-Daudé kill_process = 0; 2928d7f2e76SPhilippe Mathieu-Daudé } 2938d7f2e76SPhilippe Mathieu-Daudé } 2948d7f2e76SPhilippe Mathieu-Daudé if (kill_process == 1) { 2958d7f2e76SPhilippe Mathieu-Daudé return SCMP_ACT_KILL_PROCESS; 2968d7f2e76SPhilippe Mathieu-Daudé } 2978d7f2e76SPhilippe Mathieu-Daudé } 2988d7f2e76SPhilippe Mathieu-Daudé #endif 2998d7f2e76SPhilippe Mathieu-Daudé return action; 3008d7f2e76SPhilippe Mathieu-Daudé } 3018d7f2e76SPhilippe Mathieu-Daudé 3028d7f2e76SPhilippe Mathieu-Daudé 3038d7f2e76SPhilippe Mathieu-Daudé static int seccomp_start(uint32_t seccomp_opts, Error **errp) 3048d7f2e76SPhilippe Mathieu-Daudé { 3058d7f2e76SPhilippe Mathieu-Daudé int rc = -1; 3068d7f2e76SPhilippe Mathieu-Daudé unsigned int i = 0; 3078d7f2e76SPhilippe Mathieu-Daudé scmp_filter_ctx ctx; 3088d7f2e76SPhilippe Mathieu-Daudé 3098d7f2e76SPhilippe Mathieu-Daudé ctx = seccomp_init(SCMP_ACT_ALLOW); 3108d7f2e76SPhilippe Mathieu-Daudé if (ctx == NULL) { 3118d7f2e76SPhilippe Mathieu-Daudé error_setg(errp, "failed to initialize seccomp context"); 3128d7f2e76SPhilippe Mathieu-Daudé goto seccomp_return; 3138d7f2e76SPhilippe Mathieu-Daudé } 3148d7f2e76SPhilippe Mathieu-Daudé 3158d7f2e76SPhilippe Mathieu-Daudé #if defined(CONFIG_SECCOMP_SYSRAWRC) 3168d7f2e76SPhilippe Mathieu-Daudé /* 3178d7f2e76SPhilippe Mathieu-Daudé * This must be the first seccomp_attr_set() call to have full 3188d7f2e76SPhilippe Mathieu-Daudé * error propagation from subsequent seccomp APIs. 3198d7f2e76SPhilippe Mathieu-Daudé */ 3208d7f2e76SPhilippe Mathieu-Daudé rc = seccomp_attr_set(ctx, SCMP_FLTATR_API_SYSRAWRC, 1); 3218d7f2e76SPhilippe Mathieu-Daudé if (rc != 0) { 3228d7f2e76SPhilippe Mathieu-Daudé error_setg_errno(errp, -rc, 3238d7f2e76SPhilippe Mathieu-Daudé "failed to set seccomp rawrc attribute"); 3248d7f2e76SPhilippe Mathieu-Daudé goto seccomp_return; 3258d7f2e76SPhilippe Mathieu-Daudé } 3268d7f2e76SPhilippe Mathieu-Daudé #endif 3278d7f2e76SPhilippe Mathieu-Daudé 3288d7f2e76SPhilippe Mathieu-Daudé rc = seccomp_attr_set(ctx, SCMP_FLTATR_CTL_TSYNC, 1); 3298d7f2e76SPhilippe Mathieu-Daudé if (rc != 0) { 3308d7f2e76SPhilippe Mathieu-Daudé error_setg_errno(errp, -rc, 3318d7f2e76SPhilippe Mathieu-Daudé "failed to set seccomp thread synchronization"); 3328d7f2e76SPhilippe Mathieu-Daudé goto seccomp_return; 3338d7f2e76SPhilippe Mathieu-Daudé } 3348d7f2e76SPhilippe Mathieu-Daudé 3358d7f2e76SPhilippe Mathieu-Daudé for (i = 0; i < ARRAY_SIZE(denylist); i++) { 3368d7f2e76SPhilippe Mathieu-Daudé uint32_t action; 3378d7f2e76SPhilippe Mathieu-Daudé if (!(seccomp_opts & denylist[i].set)) { 3388d7f2e76SPhilippe Mathieu-Daudé continue; 3398d7f2e76SPhilippe Mathieu-Daudé } 3408d7f2e76SPhilippe Mathieu-Daudé 3418d7f2e76SPhilippe Mathieu-Daudé action = qemu_seccomp_update_action(denylist[i].action); 3428d7f2e76SPhilippe Mathieu-Daudé rc = seccomp_rule_add_array(ctx, action, denylist[i].num, 3438d7f2e76SPhilippe Mathieu-Daudé denylist[i].narg, denylist[i].arg_cmp); 3448d7f2e76SPhilippe Mathieu-Daudé if (rc < 0) { 3458d7f2e76SPhilippe Mathieu-Daudé error_setg_errno(errp, -rc, 3468d7f2e76SPhilippe Mathieu-Daudé "failed to add seccomp denylist rules"); 3478d7f2e76SPhilippe Mathieu-Daudé goto seccomp_return; 3488d7f2e76SPhilippe Mathieu-Daudé } 3498d7f2e76SPhilippe Mathieu-Daudé } 3508d7f2e76SPhilippe Mathieu-Daudé 3518d7f2e76SPhilippe Mathieu-Daudé rc = seccomp_load(ctx); 3528d7f2e76SPhilippe Mathieu-Daudé if (rc < 0) { 3538d7f2e76SPhilippe Mathieu-Daudé error_setg_errno(errp, -rc, 3548d7f2e76SPhilippe Mathieu-Daudé "failed to load seccomp syscall filter in kernel"); 3558d7f2e76SPhilippe Mathieu-Daudé } 3568d7f2e76SPhilippe Mathieu-Daudé 3578d7f2e76SPhilippe Mathieu-Daudé seccomp_return: 3588d7f2e76SPhilippe Mathieu-Daudé seccomp_release(ctx); 3598d7f2e76SPhilippe Mathieu-Daudé return rc < 0 ? -1 : 0; 3608d7f2e76SPhilippe Mathieu-Daudé } 3618d7f2e76SPhilippe Mathieu-Daudé 3628d7f2e76SPhilippe Mathieu-Daudé int parse_sandbox(void *opaque, QemuOpts *opts, Error **errp) 3638d7f2e76SPhilippe Mathieu-Daudé { 3648d7f2e76SPhilippe Mathieu-Daudé if (qemu_opt_get_bool(opts, "enable", false)) { 3658d7f2e76SPhilippe Mathieu-Daudé uint32_t seccomp_opts = QEMU_SECCOMP_SET_DEFAULT 3668d7f2e76SPhilippe Mathieu-Daudé | QEMU_SECCOMP_SET_OBSOLETE; 3678d7f2e76SPhilippe Mathieu-Daudé const char *value = NULL; 3688d7f2e76SPhilippe Mathieu-Daudé 3698d7f2e76SPhilippe Mathieu-Daudé value = qemu_opt_get(opts, "obsolete"); 3708d7f2e76SPhilippe Mathieu-Daudé if (value) { 3718d7f2e76SPhilippe Mathieu-Daudé if (g_str_equal(value, "allow")) { 3728d7f2e76SPhilippe Mathieu-Daudé seccomp_opts &= ~QEMU_SECCOMP_SET_OBSOLETE; 3738d7f2e76SPhilippe Mathieu-Daudé } else if (g_str_equal(value, "deny")) { 3748d7f2e76SPhilippe Mathieu-Daudé /* this is the default option, this if is here 3758d7f2e76SPhilippe Mathieu-Daudé * to provide a little bit of consistency for 3768d7f2e76SPhilippe Mathieu-Daudé * the command line */ 3778d7f2e76SPhilippe Mathieu-Daudé } else { 3788d7f2e76SPhilippe Mathieu-Daudé error_setg(errp, "invalid argument for obsolete"); 3798d7f2e76SPhilippe Mathieu-Daudé return -1; 3808d7f2e76SPhilippe Mathieu-Daudé } 3818d7f2e76SPhilippe Mathieu-Daudé } 3828d7f2e76SPhilippe Mathieu-Daudé 3838d7f2e76SPhilippe Mathieu-Daudé value = qemu_opt_get(opts, "elevateprivileges"); 3848d7f2e76SPhilippe Mathieu-Daudé if (value) { 3858d7f2e76SPhilippe Mathieu-Daudé if (g_str_equal(value, "deny")) { 3868d7f2e76SPhilippe Mathieu-Daudé seccomp_opts |= QEMU_SECCOMP_SET_PRIVILEGED; 3878d7f2e76SPhilippe Mathieu-Daudé } else if (g_str_equal(value, "children")) { 3888d7f2e76SPhilippe Mathieu-Daudé seccomp_opts |= QEMU_SECCOMP_SET_PRIVILEGED; 3898d7f2e76SPhilippe Mathieu-Daudé 3908d7f2e76SPhilippe Mathieu-Daudé /* calling prctl directly because we're 3918d7f2e76SPhilippe Mathieu-Daudé * not sure if host has CAP_SYS_ADMIN set*/ 3928d7f2e76SPhilippe Mathieu-Daudé if (prctl(PR_SET_NO_NEW_PRIVS, 1)) { 3938d7f2e76SPhilippe Mathieu-Daudé error_setg(errp, "failed to set no_new_privs aborting"); 3948d7f2e76SPhilippe Mathieu-Daudé return -1; 3958d7f2e76SPhilippe Mathieu-Daudé } 3968d7f2e76SPhilippe Mathieu-Daudé } else if (g_str_equal(value, "allow")) { 3978d7f2e76SPhilippe Mathieu-Daudé /* default value */ 3988d7f2e76SPhilippe Mathieu-Daudé } else { 3998d7f2e76SPhilippe Mathieu-Daudé error_setg(errp, "invalid argument for elevateprivileges"); 4008d7f2e76SPhilippe Mathieu-Daudé return -1; 4018d7f2e76SPhilippe Mathieu-Daudé } 4028d7f2e76SPhilippe Mathieu-Daudé } 4038d7f2e76SPhilippe Mathieu-Daudé 4048d7f2e76SPhilippe Mathieu-Daudé value = qemu_opt_get(opts, "spawn"); 4058d7f2e76SPhilippe Mathieu-Daudé if (value) { 4068d7f2e76SPhilippe Mathieu-Daudé if (g_str_equal(value, "deny")) { 4078d7f2e76SPhilippe Mathieu-Daudé seccomp_opts |= QEMU_SECCOMP_SET_SPAWN; 4088d7f2e76SPhilippe Mathieu-Daudé } else if (g_str_equal(value, "allow")) { 4098d7f2e76SPhilippe Mathieu-Daudé /* default value */ 4108d7f2e76SPhilippe Mathieu-Daudé } else { 4118d7f2e76SPhilippe Mathieu-Daudé error_setg(errp, "invalid argument for spawn"); 4128d7f2e76SPhilippe Mathieu-Daudé return -1; 4138d7f2e76SPhilippe Mathieu-Daudé } 4148d7f2e76SPhilippe Mathieu-Daudé } 4158d7f2e76SPhilippe Mathieu-Daudé 4168d7f2e76SPhilippe Mathieu-Daudé value = qemu_opt_get(opts, "resourcecontrol"); 4178d7f2e76SPhilippe Mathieu-Daudé if (value) { 4188d7f2e76SPhilippe Mathieu-Daudé if (g_str_equal(value, "deny")) { 4198d7f2e76SPhilippe Mathieu-Daudé seccomp_opts |= QEMU_SECCOMP_SET_RESOURCECTL; 4208d7f2e76SPhilippe Mathieu-Daudé } else if (g_str_equal(value, "allow")) { 4218d7f2e76SPhilippe Mathieu-Daudé /* default value */ 4228d7f2e76SPhilippe Mathieu-Daudé } else { 4238d7f2e76SPhilippe Mathieu-Daudé error_setg(errp, "invalid argument for resourcecontrol"); 4248d7f2e76SPhilippe Mathieu-Daudé return -1; 4258d7f2e76SPhilippe Mathieu-Daudé } 4268d7f2e76SPhilippe Mathieu-Daudé } 4278d7f2e76SPhilippe Mathieu-Daudé 4288d7f2e76SPhilippe Mathieu-Daudé if (seccomp_start(seccomp_opts, errp) < 0) { 4298d7f2e76SPhilippe Mathieu-Daudé return -1; 4308d7f2e76SPhilippe Mathieu-Daudé } 4318d7f2e76SPhilippe Mathieu-Daudé } 4328d7f2e76SPhilippe Mathieu-Daudé 4338d7f2e76SPhilippe Mathieu-Daudé return 0; 4348d7f2e76SPhilippe Mathieu-Daudé } 4358d7f2e76SPhilippe Mathieu-Daudé 4368d7f2e76SPhilippe Mathieu-Daudé static QemuOptsList qemu_sandbox_opts = { 4378d7f2e76SPhilippe Mathieu-Daudé .name = "sandbox", 4388d7f2e76SPhilippe Mathieu-Daudé .implied_opt_name = "enable", 4398d7f2e76SPhilippe Mathieu-Daudé .head = QTAILQ_HEAD_INITIALIZER(qemu_sandbox_opts.head), 4408d7f2e76SPhilippe Mathieu-Daudé .desc = { 4418d7f2e76SPhilippe Mathieu-Daudé { 4428d7f2e76SPhilippe Mathieu-Daudé .name = "enable", 4438d7f2e76SPhilippe Mathieu-Daudé .type = QEMU_OPT_BOOL, 4448d7f2e76SPhilippe Mathieu-Daudé }, 4458d7f2e76SPhilippe Mathieu-Daudé { 4468d7f2e76SPhilippe Mathieu-Daudé .name = "obsolete", 4478d7f2e76SPhilippe Mathieu-Daudé .type = QEMU_OPT_STRING, 4488d7f2e76SPhilippe Mathieu-Daudé }, 4498d7f2e76SPhilippe Mathieu-Daudé { 4508d7f2e76SPhilippe Mathieu-Daudé .name = "elevateprivileges", 4518d7f2e76SPhilippe Mathieu-Daudé .type = QEMU_OPT_STRING, 4528d7f2e76SPhilippe Mathieu-Daudé }, 4538d7f2e76SPhilippe Mathieu-Daudé { 4548d7f2e76SPhilippe Mathieu-Daudé .name = "spawn", 4558d7f2e76SPhilippe Mathieu-Daudé .type = QEMU_OPT_STRING, 4568d7f2e76SPhilippe Mathieu-Daudé }, 4578d7f2e76SPhilippe Mathieu-Daudé { 4588d7f2e76SPhilippe Mathieu-Daudé .name = "resourcecontrol", 4598d7f2e76SPhilippe Mathieu-Daudé .type = QEMU_OPT_STRING, 4608d7f2e76SPhilippe Mathieu-Daudé }, 4618d7f2e76SPhilippe Mathieu-Daudé { /* end of list */ } 4628d7f2e76SPhilippe Mathieu-Daudé }, 4638d7f2e76SPhilippe Mathieu-Daudé }; 4648d7f2e76SPhilippe Mathieu-Daudé 4658d7f2e76SPhilippe Mathieu-Daudé static void seccomp_register(void) 4668d7f2e76SPhilippe Mathieu-Daudé { 4678d7f2e76SPhilippe Mathieu-Daudé bool add = false; 4688d7f2e76SPhilippe Mathieu-Daudé 4698d7f2e76SPhilippe Mathieu-Daudé /* FIXME: use seccomp_api_get() >= 2 check when released */ 4708d7f2e76SPhilippe Mathieu-Daudé 4718d7f2e76SPhilippe Mathieu-Daudé #if defined(SECCOMP_FILTER_FLAG_TSYNC) 4728d7f2e76SPhilippe Mathieu-Daudé int check; 4738d7f2e76SPhilippe Mathieu-Daudé 4748d7f2e76SPhilippe Mathieu-Daudé /* check host TSYNC capability, it returns errno == ENOSYS if unavailable */ 4758d7f2e76SPhilippe Mathieu-Daudé check = qemu_seccomp(SECCOMP_SET_MODE_FILTER, 4768d7f2e76SPhilippe Mathieu-Daudé SECCOMP_FILTER_FLAG_TSYNC, NULL); 4778d7f2e76SPhilippe Mathieu-Daudé if (check < 0 && errno == EFAULT) { 4788d7f2e76SPhilippe Mathieu-Daudé add = true; 4798d7f2e76SPhilippe Mathieu-Daudé } 4808d7f2e76SPhilippe Mathieu-Daudé #endif 4818d7f2e76SPhilippe Mathieu-Daudé 4828d7f2e76SPhilippe Mathieu-Daudé if (add) { 4838d7f2e76SPhilippe Mathieu-Daudé qemu_add_opts(&qemu_sandbox_opts); 4848d7f2e76SPhilippe Mathieu-Daudé } 4858d7f2e76SPhilippe Mathieu-Daudé } 4868d7f2e76SPhilippe Mathieu-Daudé opts_init(seccomp_register); 487