@@ -43,6 +43,7 @@
#include <sys/times.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
+#include <linux/kcmp.h>
#include <unistd.h>
#include <sys/syscall.h>
@@ -166,6 +167,10 @@ struct seccomp_metadata {
#define SECCOMP_RET_USER_NOTIF 0x7fc00000U
+#ifndef SECCOMP_USER_NOTIF_FLAG_CONTINUE
+#define SECCOMP_USER_NOTIF_FLAG_CONTINUE 0x00000001
+#endif
+
#define SECCOMP_IOC_MAGIC '!'
#define SECCOMP_IO(nr) _IO(SECCOMP_IOC_MAGIC, nr)
#define SECCOMP_IOR(nr, type) _IOR(SECCOMP_IOC_MAGIC, nr, type)
@@ -3480,6 +3485,108 @@ TEST(seccomp_get_notif_sizes)
EXPECT_EQ(sizes.seccomp_notif_resp, sizeof(struct seccomp_notif_resp));
}
+static int filecmp(pid_t pid1, pid_t pid2, int fd1, int fd2)
+{
+#ifdef __NR_kcmp
+ return syscall(__NR_kcmp, pid1, pid2, KCMP_FILE, fd1, fd2);
+#else
+ errno = ENOSYS;
+ return -1;
+#endif
+}
+
+TEST(user_notification_continue)
+{
+ pid_t pid;
+ long ret;
+ int status, listener;
+ struct seccomp_notif req = {};
+ struct seccomp_notif_resp resp = {};
+ struct pollfd pollfd;
+
+ ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
+ ASSERT_EQ(0, ret) {
+ TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
+ }
+
+ listener = user_trap_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ ASSERT_GE(listener, 0);
+
+ pid = fork();
+ ASSERT_GE(pid, 0);
+
+ if (pid == 0) {
+ int dup_fd, pipe_fds[2];
+ pid_t self;
+
+ ret = pipe(pipe_fds);
+ if (ret < 0)
+ exit(1);
+
+ dup_fd = dup(pipe_fds[0]);
+ if (dup_fd < 0)
+ exit(1);
+
+ self = getpid();
+
+ ret = filecmp(self, self, pipe_fds[0], dup_fd);
+ if (ret)
+ exit(2);
+
+ exit(0);
+ }
+
+ pollfd.fd = listener;
+ pollfd.events = POLLIN | POLLOUT;
+
+ EXPECT_GT(poll(&pollfd, 1, -1), 0);
+ EXPECT_EQ(pollfd.revents, POLLIN);
+
+ EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
+
+ pollfd.fd = listener;
+ pollfd.events = POLLIN | POLLOUT;
+
+ EXPECT_GT(poll(&pollfd, 1, -1), 0);
+ EXPECT_EQ(pollfd.revents, POLLOUT);
+
+ EXPECT_EQ(req.data.nr, __NR_dup);
+
+ resp.id = req.id;
+ resp.flags = SECCOMP_USER_NOTIF_FLAG_CONTINUE;
+
+ /*
+ * Verify that setting SECCOMP_USER_NOTIF_FLAG_CONTINUE enforces other
+ * args be set to 0.
+ */
+ resp.error = 0;
+ resp.val = USER_NOTIF_MAGIC;
+ EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
+ EXPECT_EQ(errno, EINVAL);
+
+ resp.error = USER_NOTIF_MAGIC;
+ resp.val = 0;
+ EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
+ EXPECT_EQ(errno, EINVAL);
+
+ resp.error = 0;
+ resp.val = 0;
+ EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0) {
+ if (errno == EINVAL)
+ XFAIL(goto skip, "Kernel does not support SECCOMP_USER_NOTIF_FLAG_CONTINUE");
+ }
+
+skip:
+ EXPECT_EQ(waitpid(pid, &status, 0), pid);
+ EXPECT_EQ(true, WIFEXITED(status));
+ EXPECT_EQ(0, WEXITSTATUS(status)) {
+ if (WEXITSTATUS(status) == 2) {
+ XFAIL(return, "Kernel does not support kcmp() syscall");
+ return;
+ }
+ }
+}
+
/*
* TODO:
* - add microbenchmarks