migration: introduce SaveVMHandlers.resume_prepare
[qemu/ar7.git] / qemu-seccomp.c
blobb770a77d33e80cff685e9496a17b2bcb3ec33951
1 /*
2 * QEMU seccomp mode 2 support with libseccomp
4 * Copyright IBM, Corp. 2012
6 * Authors:
7 * Eduardo Otubo <eotubo@br.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
12 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
15 #include "qemu/osdep.h"
16 #include <seccomp.h>
17 #include "sysemu/seccomp.h"
19 /* For some architectures (notably ARM) cacheflush is not supported until
20 * libseccomp 2.2.3, but configure enforces that we are using a more recent
21 * version on those hosts, so it is OK for this check to be less strict.
23 #if SCMP_VER_MAJOR >= 3
24 #define HAVE_CACHEFLUSH
25 #elif SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR >= 2
26 #define HAVE_CACHEFLUSH
27 #endif
29 struct QemuSeccompSyscall {
30 int32_t num;
31 uint8_t set;
34 static const struct QemuSeccompSyscall blacklist[] = {
35 /* default set of syscalls to blacklist */
36 { SCMP_SYS(reboot), QEMU_SECCOMP_SET_DEFAULT },
37 { SCMP_SYS(swapon), QEMU_SECCOMP_SET_DEFAULT },
38 { SCMP_SYS(swapoff), QEMU_SECCOMP_SET_DEFAULT },
39 { SCMP_SYS(syslog), QEMU_SECCOMP_SET_DEFAULT },
40 { SCMP_SYS(mount), QEMU_SECCOMP_SET_DEFAULT },
41 { SCMP_SYS(umount), QEMU_SECCOMP_SET_DEFAULT },
42 { SCMP_SYS(kexec_load), QEMU_SECCOMP_SET_DEFAULT },
43 { SCMP_SYS(afs_syscall), QEMU_SECCOMP_SET_DEFAULT },
44 { SCMP_SYS(break), QEMU_SECCOMP_SET_DEFAULT },
45 { SCMP_SYS(ftime), QEMU_SECCOMP_SET_DEFAULT },
46 { SCMP_SYS(getpmsg), QEMU_SECCOMP_SET_DEFAULT },
47 { SCMP_SYS(gtty), QEMU_SECCOMP_SET_DEFAULT },
48 { SCMP_SYS(lock), QEMU_SECCOMP_SET_DEFAULT },
49 { SCMP_SYS(mpx), QEMU_SECCOMP_SET_DEFAULT },
50 { SCMP_SYS(prof), QEMU_SECCOMP_SET_DEFAULT },
51 { SCMP_SYS(profil), QEMU_SECCOMP_SET_DEFAULT },
52 { SCMP_SYS(putpmsg), QEMU_SECCOMP_SET_DEFAULT },
53 { SCMP_SYS(security), QEMU_SECCOMP_SET_DEFAULT },
54 { SCMP_SYS(stty), QEMU_SECCOMP_SET_DEFAULT },
55 { SCMP_SYS(tuxcall), QEMU_SECCOMP_SET_DEFAULT },
56 { SCMP_SYS(ulimit), QEMU_SECCOMP_SET_DEFAULT },
57 { SCMP_SYS(vserver), QEMU_SECCOMP_SET_DEFAULT },
58 /* obsolete */
59 { SCMP_SYS(readdir), QEMU_SECCOMP_SET_OBSOLETE },
60 { SCMP_SYS(_sysctl), QEMU_SECCOMP_SET_OBSOLETE },
61 { SCMP_SYS(bdflush), QEMU_SECCOMP_SET_OBSOLETE },
62 { SCMP_SYS(create_module), QEMU_SECCOMP_SET_OBSOLETE },
63 { SCMP_SYS(get_kernel_syms), QEMU_SECCOMP_SET_OBSOLETE },
64 { SCMP_SYS(query_module), QEMU_SECCOMP_SET_OBSOLETE },
65 { SCMP_SYS(sgetmask), QEMU_SECCOMP_SET_OBSOLETE },
66 { SCMP_SYS(ssetmask), QEMU_SECCOMP_SET_OBSOLETE },
67 { SCMP_SYS(sysfs), QEMU_SECCOMP_SET_OBSOLETE },
68 { SCMP_SYS(uselib), QEMU_SECCOMP_SET_OBSOLETE },
69 { SCMP_SYS(ustat), QEMU_SECCOMP_SET_OBSOLETE },
70 /* privileged */
71 { SCMP_SYS(setuid), QEMU_SECCOMP_SET_PRIVILEGED },
72 { SCMP_SYS(setgid), QEMU_SECCOMP_SET_PRIVILEGED },
73 { SCMP_SYS(setpgid), QEMU_SECCOMP_SET_PRIVILEGED },
74 { SCMP_SYS(setsid), QEMU_SECCOMP_SET_PRIVILEGED },
75 { SCMP_SYS(setreuid), QEMU_SECCOMP_SET_PRIVILEGED },
76 { SCMP_SYS(setregid), QEMU_SECCOMP_SET_PRIVILEGED },
77 { SCMP_SYS(setresuid), QEMU_SECCOMP_SET_PRIVILEGED },
78 { SCMP_SYS(setresgid), QEMU_SECCOMP_SET_PRIVILEGED },
79 { SCMP_SYS(setfsuid), QEMU_SECCOMP_SET_PRIVILEGED },
80 { SCMP_SYS(setfsgid), QEMU_SECCOMP_SET_PRIVILEGED },
81 /* spawn */
82 { SCMP_SYS(fork), QEMU_SECCOMP_SET_SPAWN },
83 { SCMP_SYS(vfork), QEMU_SECCOMP_SET_SPAWN },
84 { SCMP_SYS(execve), QEMU_SECCOMP_SET_SPAWN },
85 /* resource control */
86 { SCMP_SYS(getpriority), QEMU_SECCOMP_SET_RESOURCECTL },
87 { SCMP_SYS(setpriority), QEMU_SECCOMP_SET_RESOURCECTL },
88 { SCMP_SYS(sched_setparam), QEMU_SECCOMP_SET_RESOURCECTL },
89 { SCMP_SYS(sched_getparam), QEMU_SECCOMP_SET_RESOURCECTL },
90 { SCMP_SYS(sched_setscheduler), QEMU_SECCOMP_SET_RESOURCECTL },
91 { SCMP_SYS(sched_getscheduler), QEMU_SECCOMP_SET_RESOURCECTL },
92 { SCMP_SYS(sched_setaffinity), QEMU_SECCOMP_SET_RESOURCECTL },
93 { SCMP_SYS(sched_getaffinity), QEMU_SECCOMP_SET_RESOURCECTL },
94 { SCMP_SYS(sched_get_priority_max), QEMU_SECCOMP_SET_RESOURCECTL },
95 { SCMP_SYS(sched_get_priority_min), QEMU_SECCOMP_SET_RESOURCECTL },
99 int seccomp_start(uint32_t seccomp_opts)
101 int rc = 0;
102 unsigned int i = 0;
103 scmp_filter_ctx ctx;
105 ctx = seccomp_init(SCMP_ACT_ALLOW);
106 if (ctx == NULL) {
107 rc = -1;
108 goto seccomp_return;
111 for (i = 0; i < ARRAY_SIZE(blacklist); i++) {
112 if (!(seccomp_opts & blacklist[i].set)) {
113 continue;
116 rc = seccomp_rule_add(ctx, SCMP_ACT_KILL, blacklist[i].num, 0);
117 if (rc < 0) {
118 goto seccomp_return;
122 rc = seccomp_load(ctx);
124 seccomp_return:
125 seccomp_release(ctx);
126 return rc;