seccomp: check TSYNC host capability

[mirror_qemu.git] / qemu-seccomp.c

diff --git a/qemu-seccomp.c b/qemu-seccomp.c
index 4729eb107f8ff169a1011dd96264fd2d82910e46..1baa5c69ed0129b2719dd5b7f0cbd78613643b2d 100644 (file)
--- a/qemu-seccomp.c
+++ b/qemu-seccomp.c
@@ -282,7 +282,24 @@ static QemuOptsList qemu_sandbox_opts = {
 
 static void seccomp_register(void)
 {
-    qemu_add_opts(&qemu_sandbox_opts);
+    bool add = false;
+
+    /* FIXME: use seccomp_api_get() >= 2 check when released */
+
+#if defined(SECCOMP_FILTER_FLAG_TSYNC)
+    int check;
+
+    /* check host TSYNC capability, it returns errno == ENOSYS if unavailable */
+    check = qemu_seccomp(SECCOMP_SET_MODE_FILTER,
+                         SECCOMP_FILTER_FLAG_TSYNC, NULL);
+    if (check < 0 && errno == EFAULT) {
+        add = true;
+    }
+#endif
+
+    if (add) {
+        qemu_add_opts(&qemu_sandbox_opts);
+    }
 }
 opts_init(seccomp_register);
 #endif