Adding qemu-seccomp.[ch] (v8)
[qemu.git] / qemu-seccomp.c
1 /*
2 * QEMU seccomp mode 2 support with libseccomp
3 *
4 * Copyright IBM, Corp. 2012
5 *
6 * Authors:
7 * Eduardo Otubo <eotubo@br.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
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.
14 */
15 #include <stdio.h>
16 #include <seccomp.h>
17 #include "qemu-seccomp.h"
18
19 struct QemuSeccompSyscall {
20 int32_t num;
21 uint8_t priority;
22 };
23
24 static const struct QemuSeccompSyscall seccomp_whitelist[] = {
25 { SCMP_SYS(timer_settime), 255 },
26 { SCMP_SYS(timer_gettime), 254 },
27 { SCMP_SYS(futex), 253 },
28 { SCMP_SYS(select), 252 },
29 { SCMP_SYS(recvfrom), 251 },
30 { SCMP_SYS(sendto), 250 },
31 { SCMP_SYS(read), 249 },
32 { SCMP_SYS(brk), 248 },
33 { SCMP_SYS(clone), 247 },
34 { SCMP_SYS(mmap), 247 },
35 { SCMP_SYS(mprotect), 246 },
36 { SCMP_SYS(execve), 245 },
37 { SCMP_SYS(open), 245 },
38 { SCMP_SYS(ioctl), 245 },
39 { SCMP_SYS(recvmsg), 245 },
40 { SCMP_SYS(sendmsg), 245 },
41 { SCMP_SYS(accept), 245 },
42 { SCMP_SYS(connect), 245 },
43 { SCMP_SYS(gettimeofday), 245 },
44 { SCMP_SYS(readlink), 245 },
45 { SCMP_SYS(access), 245 },
46 { SCMP_SYS(prctl), 245 },
47 { SCMP_SYS(signalfd), 245 },
48 #if defined(__i386__)
49 { SCMP_SYS(fcntl64), 245 },
50 { SCMP_SYS(fstat64), 245 },
51 { SCMP_SYS(stat64), 245 },
52 { SCMP_SYS(getgid32), 245 },
53 { SCMP_SYS(getegid32), 245 },
54 { SCMP_SYS(getuid32), 245 },
55 { SCMP_SYS(geteuid32), 245 },
56 { SCMP_SYS(sigreturn), 245 },
57 { SCMP_SYS(_newselect), 245 },
58 { SCMP_SYS(_llseek), 245 },
59 { SCMP_SYS(mmap2), 245},
60 { SCMP_SYS(sigprocmask), 245 },
61 #elif defined(__x86_64__)
62 { SCMP_SYS(sched_getparam), 245},
63 { SCMP_SYS(sched_getscheduler), 245},
64 { SCMP_SYS(fstat), 245},
65 { SCMP_SYS(clock_getres), 245},
66 { SCMP_SYS(sched_get_priority_min), 245},
67 { SCMP_SYS(sched_get_priority_max), 245},
68 { SCMP_SYS(stat), 245},
69 { SCMP_SYS(socket), 245},
70 { SCMP_SYS(setsockopt), 245},
71 { SCMP_SYS(uname), 245},
72 { SCMP_SYS(semget), 245},
73 #endif
74 { SCMP_SYS(eventfd2), 245 },
75 { SCMP_SYS(dup), 245 },
76 { SCMP_SYS(gettid), 245 },
77 { SCMP_SYS(timer_create), 245 },
78 { SCMP_SYS(exit), 245 },
79 { SCMP_SYS(clock_gettime), 245 },
80 { SCMP_SYS(time), 245 },
81 { SCMP_SYS(restart_syscall), 245 },
82 { SCMP_SYS(pwrite64), 245 },
83 { SCMP_SYS(chown), 245 },
84 { SCMP_SYS(openat), 245 },
85 { SCMP_SYS(getdents), 245 },
86 { SCMP_SYS(timer_delete), 245 },
87 { SCMP_SYS(exit_group), 245 },
88 { SCMP_SYS(rt_sigreturn), 245 },
89 { SCMP_SYS(sync), 245 },
90 { SCMP_SYS(pread64), 245 },
91 { SCMP_SYS(madvise), 245 },
92 { SCMP_SYS(set_robust_list), 245 },
93 { SCMP_SYS(lseek), 245 },
94 { SCMP_SYS(pselect6), 245 },
95 { SCMP_SYS(fork), 245 },
96 { SCMP_SYS(bind), 245 },
97 { SCMP_SYS(listen), 245 },
98 { SCMP_SYS(eventfd), 245 },
99 { SCMP_SYS(rt_sigprocmask), 245 },
100 { SCMP_SYS(write), 244 },
101 { SCMP_SYS(fcntl), 243 },
102 { SCMP_SYS(tgkill), 242 },
103 { SCMP_SYS(rt_sigaction), 242 },
104 { SCMP_SYS(pipe2), 242 },
105 { SCMP_SYS(munmap), 242 },
106 { SCMP_SYS(mremap), 242 },
107 { SCMP_SYS(getsockname), 242 },
108 { SCMP_SYS(getpeername), 242 },
109 { SCMP_SYS(fdatasync), 242 },
110 { SCMP_SYS(close), 242 }
111 };
112
113 int seccomp_start(void)
114 {
115 int rc = 0;
116 unsigned int i = 0;
117 scmp_filter_ctx ctx;
118
119 ctx = seccomp_init(SCMP_ACT_KILL);
120 if (ctx == NULL) {
121 goto seccomp_return;
122 }
123
124 for (i = 0; i < ARRAY_SIZE(seccomp_whitelist); i++) {
125 rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, seccomp_whitelist[i].num, 0);
126 if (rc < 0) {
127 goto seccomp_return;
128 }
129 rc = seccomp_syscall_priority(ctx, seccomp_whitelist[i].num,
130 seccomp_whitelist[i].priority);
131 if (rc < 0) {
132 goto seccomp_return;
133 }
134 }
135
136 rc = seccomp_load(ctx);
137
138 seccomp_return:
139 seccomp_release(ctx);
140 return rc;
141 }