Update from chromium 62675d9fb31fb8cedc40f68e78e8445a74f362e7

sandbox/linux/seccomp-bpf/syscall_iterator_unittest.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sandbox/linux/seccomp-bpf/syscall_iterator.h"
+
+#include <stdint.h>
+
+#include "sandbox/linux/seccomp-bpf/linux_seccomp.h"
+#include "sandbox/linux/tests/unit_tests.h"
+
+namespace sandbox {
+
+namespace {
+
+const SyscallSet kSyscallSets[] = {
+    SyscallSet::All(),
+    SyscallSet::InvalidOnly(),
+};
+
+SANDBOX_TEST(SyscallIterator, Monotonous) {
+  for (const SyscallSet& set : kSyscallSets) {
+    uint32_t prev = 0;
+    bool have_prev = false;
+    for (uint32_t sysnum : set) {
+      if (have_prev) {
+        SANDBOX_ASSERT(sysnum > prev);
+      } else if (set == SyscallSet::All()) {
+        // The iterator should start at 0.
+        SANDBOX_ASSERT(sysnum == 0);
+      }
+
+      prev = sysnum;
+      have_prev = true;
+    }
+
+    // The iterator should always return 0xFFFFFFFFu as the last value.
+    SANDBOX_ASSERT(have_prev);
+    SANDBOX_ASSERT(prev == 0xFFFFFFFFu);
+  }
+}
+
+// AssertRange checks that SyscallIterator produces all system call
+// numbers in the inclusive range [min, max].
+void AssertRange(uint32_t min, uint32_t max) {
+  SANDBOX_ASSERT(min < max);
+  uint32_t prev = min - 1;
+  for (uint32_t sysnum : SyscallSet::All()) {
+    if (sysnum >= min && sysnum <= max) {
+      SANDBOX_ASSERT(prev == sysnum - 1);
+      prev = sysnum;
+    }
+  }
+  SANDBOX_ASSERT(prev == max);
+}
+
+SANDBOX_TEST(SyscallIterator, ValidSyscallRanges) {
+  AssertRange(MIN_SYSCALL, MAX_PUBLIC_SYSCALL);
+#if defined(__arm__)
+  AssertRange(MIN_PRIVATE_SYSCALL, MAX_PRIVATE_SYSCALL);
+  AssertRange(MIN_GHOST_SYSCALL, MAX_SYSCALL);
+#endif
+}
+
+SANDBOX_TEST(SyscallIterator, InvalidSyscalls) {
+  static const uint32_t kExpected[] = {
+#if defined(__mips__)
+    0,
+    MIN_SYSCALL - 1,
+#endif
+    MAX_PUBLIC_SYSCALL + 1,
+#if defined(__arm__)
+    MIN_PRIVATE_SYSCALL - 1,
+    MAX_PRIVATE_SYSCALL + 1,
+    MIN_GHOST_SYSCALL - 1,
+    MAX_SYSCALL + 1,
+#endif
+    0x7FFFFFFFu,
+    0x80000000u,
+    0xFFFFFFFFu,
+  };
+
+  for (const SyscallSet& set : kSyscallSets) {
+    size_t i = 0;
+    for (uint32_t sysnum : set) {
+      if (!SyscallSet::IsValid(sysnum)) {
+        SANDBOX_ASSERT(i < arraysize(kExpected));
+        SANDBOX_ASSERT(kExpected[i] == sysnum);
+        ++i;
+      }
+    }
+    SANDBOX_ASSERT(i == arraysize(kExpected));
+  }
+}
+
+SANDBOX_TEST(SyscallIterator, InvalidOnlyIsOnlyInvalid) {
+  for (uint32_t sysnum : SyscallSet::InvalidOnly()) {
+    SANDBOX_ASSERT(!SyscallSet::IsValid(sysnum));
+  }
+}
+
+}  // namespace
+
+}  // namespace sandbox