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Diffstat (limited to 'test/syscalls/linux/kcov.cc')
-rw-r--r-- | test/syscalls/linux/kcov.cc | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/test/syscalls/linux/kcov.cc b/test/syscalls/linux/kcov.cc deleted file mode 100644 index f3c30444e..000000000 --- a/test/syscalls/linux/kcov.cc +++ /dev/null @@ -1,70 +0,0 @@ -// Copyright 2018 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include <sys/errno.h> -#include <sys/ioctl.h> -#include <sys/mman.h> - -#include "gtest/gtest.h" -#include "test/util/capability_util.h" -#include "test/util/file_descriptor.h" -#include "test/util/test_util.h" - -namespace gvisor { -namespace testing { - -namespace { - -// For this test to work properly, it must be run with coverage enabled. On -// native Linux, this involves compiling the kernel with kcov enabled. For -// gVisor, we need to enable the Go coverage tool, e.g. -// bazel test --collect_coverage_data --instrumentation_filter=//pkg/... <test>. -TEST(KcovTest, Kcov) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability((CAP_DAC_OVERRIDE)))); - - constexpr int kSize = 4096; - constexpr int KCOV_INIT_TRACE = 0x80086301; - constexpr int KCOV_ENABLE = 0x6364; - - int fd; - ASSERT_THAT(fd = open("/sys/kernel/debug/kcov", O_RDWR), - AnyOf(SyscallSucceeds(), SyscallFailsWithErrno(ENOENT))); - - // Kcov not enabled. - SKIP_IF(errno == ENOENT); - - ASSERT_THAT(ioctl(fd, KCOV_INIT_TRACE, kSize), SyscallSucceeds()); - uint64_t* area = (uint64_t*)mmap(nullptr, kSize * sizeof(uint64_t), - PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); - - ASSERT_TRUE(area != MAP_FAILED); - ASSERT_THAT(ioctl(fd, KCOV_ENABLE, 0), SyscallSucceeds()); - - for (int i = 0; i < 10; i++) { - // Make some syscalls to generate coverage data. - ASSERT_THAT(ioctl(fd, KCOV_ENABLE, 0), SyscallFailsWithErrno(EINVAL)); - } - - uint64_t num_pcs = *(uint64_t*)(area); - EXPECT_GT(num_pcs, 0); - for (uint64_t i = 1; i <= num_pcs; i++) { - // Verify that PCs are in the standard kernel range. - EXPECT_GT(area[i], 0xffffffff7fffffffL); - } -} - -} // namespace - -} // namespace testing -} // namespace gvisor |