diff options
Diffstat (limited to 'qemu-seccomp.c')
| -rw-r--r-- | qemu-seccomp.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/qemu-seccomp.c b/qemu-seccomp.c new file mode 100644 index 0000000..64329a3 --- /dev/null +++ b/qemu-seccomp.c @@ -0,0 +1,141 @@ +/* + * 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 <stdio.h> +#include <seccomp.h> +#include "qemu-seccomp.h" + +struct QemuSeccompSyscall { + int32_t num; + 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(read), 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(recvmsg), 245 }, + { SCMP_SYS(sendmsg), 245 }, + { SCMP_SYS(accept), 245 }, + { SCMP_SYS(connect), 245 }, + { SCMP_SYS(gettimeofday), 245 }, + { SCMP_SYS(readlink), 245 }, + { SCMP_SYS(access), 245 }, + { SCMP_SYS(prctl), 245 }, + { SCMP_SYS(signalfd), 245 }, +#if defined(__i386__) + { 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 }, +#elif defined(__x86_64__) + { 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(socket), 245}, + { SCMP_SYS(setsockopt), 245}, + { SCMP_SYS(uname), 245}, + { SCMP_SYS(semget), 245}, +#endif + { SCMP_SYS(eventfd2), 245 }, + { SCMP_SYS(dup), 245 }, + { SCMP_SYS(gettid), 245 }, + { SCMP_SYS(timer_create), 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(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(bind), 245 }, + { SCMP_SYS(listen), 245 }, + { SCMP_SYS(eventfd), 245 }, + { SCMP_SYS(rt_sigprocmask), 245 }, + { SCMP_SYS(write), 244 }, + { SCMP_SYS(fcntl), 243 }, + { SCMP_SYS(tgkill), 242 }, + { SCMP_SYS(rt_sigaction), 242 }, + { SCMP_SYS(pipe2), 242 }, + { SCMP_SYS(munmap), 242 }, + { SCMP_SYS(mremap), 242 }, + { SCMP_SYS(getsockname), 242 }, + { SCMP_SYS(getpeername), 242 }, + { SCMP_SYS(fdatasync), 242 }, + { SCMP_SYS(close), 242 } +}; + +int seccomp_start(void) +{ + int rc = 0; + unsigned int i = 0; + scmp_filter_ctx ctx; + + ctx = seccomp_init(SCMP_ACT_KILL); + if (ctx == NULL) { + 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); + if (rc < 0) { + goto seccomp_return; + } + rc = seccomp_syscall_priority(ctx, seccomp_whitelist[i].num, + seccomp_whitelist[i].priority); + if (rc < 0) { + goto seccomp_return; + } + } + + rc = seccomp_load(ctx); + + seccomp_return: + seccomp_release(ctx); + return rc; +} |