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-rw-r--r--src/nspawn/nspawn.c47
1 files changed, 35 insertions, 12 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index fd61d07761..656c1bf9f5 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -1864,22 +1864,25 @@ static int setup_macvlan(pid_t pid) {
return 0;
}
-static int audit_still_doesnt_work_in_containers(void) {
+static int setup_seccomp(void) {
#ifdef HAVE_SECCOMP
+ static const int blacklist[] = {
+ SCMP_SYS(kexec_load),
+ SCMP_SYS(open_by_handle_at),
+ SCMP_SYS(init_module),
+ SCMP_SYS(finit_module),
+ SCMP_SYS(delete_module),
+ SCMP_SYS(iopl),
+ SCMP_SYS(ioperm),
+ SCMP_SYS(swapon),
+ SCMP_SYS(swapoff),
+ };
+
scmp_filter_ctx seccomp;
+ unsigned i;
int r;
- /*
- Audit is broken in containers, much of the userspace audit
- hookup will fail if running inside a container. We don't
- care and just turn off creation of audit sockets.
-
- This will make socket(AF_NETLINK, *, NETLINK_AUDIT) fail
- with EAFNOSUPPORT which audit userspace uses as indication
- that audit is disabled in the kernel.
- */
-
seccomp = seccomp_init(SCMP_ACT_ALLOW);
if (!seccomp)
return log_oom();
@@ -1890,6 +1893,26 @@ static int audit_still_doesnt_work_in_containers(void) {
goto finish;
}
+ for (i = 0; i < ELEMENTSOF(blacklist); i++) {
+ r = seccomp_rule_add(seccomp, SCMP_ACT_ERRNO(EPERM), blacklist[i], 0);
+ if (r == -EFAULT)
+ continue; /* unknown syscall */
+ if (r < 0) {
+ log_error("Failed to block syscall: %s", strerror(-r));
+ goto finish;
+ }
+ }
+
+ /*
+ Audit is broken in containers, much of the userspace audit
+ hookup will fail if running inside a container. We don't
+ care and just turn off creation of audit sockets.
+
+ This will make socket(AF_NETLINK, *, NETLINK_AUDIT) fail
+ with EAFNOSUPPORT which audit userspace uses as indication
+ that audit is disabled in the kernel.
+ */
+
r = seccomp_rule_add(
seccomp,
SCMP_ACT_ERRNO(EAFNOSUPPORT),
@@ -3050,7 +3073,7 @@ int main(int argc, char *argv[]) {
dev_setup(arg_directory);
- if (audit_still_doesnt_work_in_containers() < 0)
+ if (setup_seccomp() < 0)
goto child_fail;
if (setup_dev_console(arg_directory, console) < 0)