diff options
Diffstat (limited to 'test/syscalls/linux')
| -rw-r--r-- | test/syscalls/linux/BUILD | 15 | ||||
| -rw-r--r-- | test/syscalls/linux/mlock.cc | 344 | ||||
| -rw-r--r-- | test/syscalls/linux/msync.cc | 20 |
3 files changed, 6 insertions, 373 deletions
diff --git a/test/syscalls/linux/BUILD b/test/syscalls/linux/BUILD index f13e32daa..c0b8246b5 100644 --- a/test/syscalls/linux/BUILD +++ b/test/syscalls/linux/BUILD @@ -1020,21 +1020,6 @@ cc_binary( ) cc_binary( - name = "mlock_test", - testonly = 1, - srcs = ["mlock.cc"], - linkstatic = 1, - deps = [ - "//test/util:capability_util", - "//test/util:cleanup", - "//test/util:memory_util", - "//test/util:multiprocess_util", - "//test/util:test_util", - "@com_google_googletest//:gtest", - ], -) - -cc_binary( name = "mmap_test", testonly = 1, srcs = ["mmap.cc"], diff --git a/test/syscalls/linux/mlock.cc b/test/syscalls/linux/mlock.cc deleted file mode 100644 index a0d876c2e..000000000 --- a/test/syscalls/linux/mlock.cc +++ /dev/null @@ -1,344 +0,0 @@ -// Copyright 2018 Google LLC -// -// 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 <errno.h> -#include <string.h> -#include <sys/mman.h> -#include <sys/resource.h> -#include <sys/syscall.h> -#include <unistd.h> - -#include "test/util/capability_util.h" -#include "test/util/cleanup.h" -#include "test/util/memory_util.h" -#include "test/util/multiprocess_util.h" -#include "test/util/test_util.h" - -using ::testing::_; - -namespace gvisor { -namespace testing { - -namespace { - -PosixErrorOr<bool> CanMlock() { - struct rlimit rlim; - if (getrlimit(RLIMIT_MEMLOCK, &rlim) < 0) { - return PosixError(errno, "getrlimit(RLIMIT_MEMLOCK)"); - } - if (rlim.rlim_cur != 0) { - return true; - } - return HaveCapability(CAP_IPC_LOCK); -} - -// Returns true if the page containing addr is mlocked. -bool IsPageMlocked(uintptr_t addr) { - // This relies on msync(MS_INVALIDATE) interacting correctly with mlocked - // pages, which is tested for by the MsyncInvalidate case below. - int const rv = msync(reinterpret_cast<void*>(addr & ~(kPageSize - 1)), - kPageSize, MS_ASYNC | MS_INVALIDATE); - if (rv == 0) { - return false; - } - // This uses TEST_PCHECK_MSG since it's used in subprocesses. - TEST_PCHECK_MSG(errno == EBUSY, "msync failed with unexpected errno"); - return true; -} - -PosixErrorOr<Cleanup> ScopedSetSoftRlimit(int resource, rlim_t newval) { - struct rlimit old_rlim; - if (getrlimit(resource, &old_rlim) != 0) { - return PosixError(errno, "getrlimit failed"); - } - struct rlimit new_rlim = old_rlim; - new_rlim.rlim_cur = newval; - if (setrlimit(resource, &new_rlim) != 0) { - return PosixError(errno, "setrlimit failed"); - } - return Cleanup([resource, old_rlim] { - TEST_PCHECK(setrlimit(resource, &old_rlim) == 0); - }); -} - -TEST(MlockTest, Basic) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); - ASSERT_THAT(mlock(mapping.ptr(), mapping.len()), SyscallSucceeds()); - EXPECT_TRUE(IsPageMlocked(mapping.addr())); -} - -TEST(MlockTest, ProtNone) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = - ASSERT_NO_ERRNO_AND_VALUE(MmapAnon(kPageSize, PROT_NONE, MAP_PRIVATE)); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); - ASSERT_THAT(mlock(mapping.ptr(), mapping.len()), - SyscallFailsWithErrno(ENOMEM)); - // ENOMEM is returned because mlock can't populate the page, but it's still - // considered locked. - EXPECT_TRUE(IsPageMlocked(mapping.addr())); -} - -TEST(MlockTest, MadviseDontneed) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - ASSERT_THAT(mlock(mapping.ptr(), mapping.len()), SyscallSucceeds()); - EXPECT_THAT(madvise(mapping.ptr(), mapping.len(), MADV_DONTNEED), - SyscallFailsWithErrno(EINVAL)); -} - -TEST(MlockTest, MsyncInvalidate) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - ASSERT_THAT(mlock(mapping.ptr(), mapping.len()), SyscallSucceeds()); - EXPECT_THAT(msync(mapping.ptr(), mapping.len(), MS_ASYNC | MS_INVALIDATE), - SyscallFailsWithErrno(EBUSY)); - EXPECT_THAT(msync(mapping.ptr(), mapping.len(), MS_SYNC | MS_INVALIDATE), - SyscallFailsWithErrno(EBUSY)); -} - -TEST(MlockTest, Fork) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); - ASSERT_THAT(mlock(mapping.ptr(), mapping.len()), SyscallSucceeds()); - EXPECT_TRUE(IsPageMlocked(mapping.addr())); - EXPECT_THAT( - InForkedProcess([&] { TEST_CHECK(!IsPageMlocked(mapping.addr())); }), - IsPosixErrorOkAndHolds(0)); -} - -TEST(MlockTest, RlimitMemlockZero) { - if (ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_IPC_LOCK))) { - ASSERT_NO_ERRNO(SetCapability(CAP_IPC_LOCK, false)); - } - Cleanup reset_rlimit = - ASSERT_NO_ERRNO_AND_VALUE(ScopedSetSoftRlimit(RLIMIT_MEMLOCK, 0)); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); - ASSERT_THAT(mlock(mapping.ptr(), mapping.len()), - SyscallFailsWithErrno(EPERM)); -} - -TEST(MlockTest, RlimitMemlockInsufficient) { - if (ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_IPC_LOCK))) { - ASSERT_NO_ERRNO(SetCapability(CAP_IPC_LOCK, false)); - } - Cleanup reset_rlimit = - ASSERT_NO_ERRNO_AND_VALUE(ScopedSetSoftRlimit(RLIMIT_MEMLOCK, kPageSize)); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(2 * kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); - ASSERT_THAT(mlock(mapping.ptr(), mapping.len()), - SyscallFailsWithErrno(ENOMEM)); -} - -TEST(MunlockTest, Basic) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); - ASSERT_THAT(mlock(mapping.ptr(), mapping.len()), SyscallSucceeds()); - EXPECT_TRUE(IsPageMlocked(mapping.addr())); - ASSERT_THAT(munlock(mapping.ptr(), mapping.len()), SyscallSucceeds()); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); -} - -TEST(MunlockTest, NotLocked) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); - EXPECT_THAT(munlock(mapping.ptr(), mapping.len()), SyscallSucceeds()); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); -} - -// There is currently no test for mlockall(MCL_CURRENT) because the default -// RLIMIT_MEMLOCK of 64 KB is insufficient to actually invoke -// mlockall(MCL_CURRENT). - -TEST(MlockallTest, Future) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - - // Run this test in a separate (single-threaded) subprocess to ensure that a - // background thread doesn't try to mmap a large amount of memory, fail due - // to hitting RLIMIT_MEMLOCK, and explode the process violently. - EXPECT_THAT(InForkedProcess([] { - auto const mapping = - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE) - .ValueOrDie(); - TEST_CHECK(!IsPageMlocked(mapping.addr())); - TEST_PCHECK(mlockall(MCL_FUTURE) == 0); - // Ensure that mlockall(MCL_FUTURE) is turned off before the end - // of the test, as otherwise mmaps may fail unexpectedly. - Cleanup do_munlockall([] { TEST_PCHECK(munlockall() == 0); }); - auto const mapping2 = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - TEST_CHECK(IsPageMlocked(mapping2.addr())); - // Fire munlockall() and check that it disables - // mlockall(MCL_FUTURE). - do_munlockall.Release()(); - auto const mapping3 = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - TEST_CHECK(!IsPageMlocked(mapping2.addr())); - }), - IsPosixErrorOkAndHolds(0)); -} - -TEST(MunlockallTest, Basic) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_LOCKED)); - EXPECT_TRUE(IsPageMlocked(mapping.addr())); - ASSERT_THAT(munlockall(), SyscallSucceeds()); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); -} - -#ifndef SYS_mlock2 -#ifdef __x86_64__ -#define SYS_mlock2 325 -#endif -#endif - -#ifndef MLOCK_ONFAULT -#define MLOCK_ONFAULT 0x01 // Linux: include/uapi/asm-generic/mman-common.h -#endif - -#ifdef SYS_mlock2 - -int mlock2(void const* addr, size_t len, int flags) { - return syscall(SYS_mlock2, addr, len, flags); -} - -TEST(Mlock2Test, NoFlags) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); - ASSERT_THAT(mlock2(mapping.ptr(), mapping.len(), 0), SyscallSucceeds()); - EXPECT_TRUE(IsPageMlocked(mapping.addr())); -} - -TEST(Mlock2Test, MlockOnfault) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); - ASSERT_THAT(mlock2(mapping.ptr(), mapping.len(), MLOCK_ONFAULT), - SyscallSucceeds()); - EXPECT_TRUE(IsPageMlocked(mapping.addr())); -} - -TEST(Mlock2Test, UnknownFlags) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE)); - EXPECT_THAT(mlock2(mapping.ptr(), mapping.len(), ~0), - SyscallFailsWithErrno(EINVAL)); -} - -#endif // defined(SYS_mlock2) - -TEST(MapLockedTest, Basic) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto const mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_LOCKED)); - EXPECT_TRUE(IsPageMlocked(mapping.addr())); - EXPECT_THAT(munlock(mapping.ptr(), mapping.len()), SyscallSucceeds()); - EXPECT_FALSE(IsPageMlocked(mapping.addr())); -} - -TEST(MapLockedTest, RlimitMemlockZero) { - if (ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_IPC_LOCK))) { - ASSERT_NO_ERRNO(SetCapability(CAP_IPC_LOCK, false)); - } - Cleanup reset_rlimit = - ASSERT_NO_ERRNO_AND_VALUE(ScopedSetSoftRlimit(RLIMIT_MEMLOCK, 0)); - EXPECT_THAT( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_LOCKED), - PosixErrorIs(EPERM, _)); -} - -TEST(MapLockedTest, RlimitMemlockInsufficient) { - if (ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_IPC_LOCK))) { - ASSERT_NO_ERRNO(SetCapability(CAP_IPC_LOCK, false)); - } - Cleanup reset_rlimit = - ASSERT_NO_ERRNO_AND_VALUE(ScopedSetSoftRlimit(RLIMIT_MEMLOCK, kPageSize)); - EXPECT_THAT( - MmapAnon(2 * kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_LOCKED), - PosixErrorIs(EAGAIN, _)); -} - -TEST(MremapLockedTest, Basic) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_LOCKED)); - EXPECT_TRUE(IsPageMlocked(mapping.addr())); - - void* addr = mremap(mapping.ptr(), mapping.len(), 2 * mapping.len(), - MREMAP_MAYMOVE, nullptr); - if (addr == MAP_FAILED) { - FAIL() << "mremap failed: " << errno << " (" << strerror(errno) << ")"; - } - mapping.release(); - mapping.reset(addr, 2 * mapping.len()); - EXPECT_TRUE(IsPageMlocked(reinterpret_cast<uintptr_t>(addr))); -} - -TEST(MremapLockedTest, RlimitMemlockZero) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_LOCKED)); - EXPECT_TRUE(IsPageMlocked(mapping.addr())); - - if (ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_IPC_LOCK))) { - ASSERT_NO_ERRNO(SetCapability(CAP_IPC_LOCK, false)); - } - Cleanup reset_rlimit = - ASSERT_NO_ERRNO_AND_VALUE(ScopedSetSoftRlimit(RLIMIT_MEMLOCK, 0)); - void* addr = mremap(mapping.ptr(), mapping.len(), 2 * mapping.len(), - MREMAP_MAYMOVE, nullptr); - EXPECT_TRUE(addr == MAP_FAILED && errno == EAGAIN) - << "addr = " << addr << ", errno = " << errno; -} - -TEST(MremapLockedTest, RlimitMemlockInsufficient) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanMlock())); - auto mapping = ASSERT_NO_ERRNO_AND_VALUE( - MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_LOCKED)); - EXPECT_TRUE(IsPageMlocked(mapping.addr())); - - if (ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_IPC_LOCK))) { - ASSERT_NO_ERRNO(SetCapability(CAP_IPC_LOCK, false)); - } - Cleanup reset_rlimit = ASSERT_NO_ERRNO_AND_VALUE( - ScopedSetSoftRlimit(RLIMIT_MEMLOCK, mapping.len())); - void* addr = mremap(mapping.ptr(), mapping.len(), 2 * mapping.len(), - MREMAP_MAYMOVE, nullptr); - EXPECT_TRUE(addr == MAP_FAILED && errno == EAGAIN) - << "addr = " << addr << ", errno = " << errno; -} - -} // namespace - -} // namespace testing -} // namespace gvisor diff --git a/test/syscalls/linux/msync.cc b/test/syscalls/linux/msync.cc index 72d90dc78..0ddc621aa 100644 --- a/test/syscalls/linux/msync.cc +++ b/test/syscalls/linux/msync.cc @@ -43,13 +43,14 @@ class MsyncParameterizedTest : public ::testing::TestWithParam<MsyncTestParam> { protected: int msync_flags() const { return std::get<0>(GetParam()); } - PosixErrorOr<Mapping> GetMapping() const { return std::get<1>(GetParam())(); } + PosixErrorOr<Mapping> GetMapping() const { + auto rv = std::get<1>(GetParam())(); + return rv; + } }; -// All valid msync(2) flag combinations, not including MS_INVALIDATE. ("Linux -// permits a call to msync() that specifies neither [MS_SYNC or MS_ASYNC], with -// semantics that are (currently) equivalent to specifying MS_ASYNC." - -// msync(2)) +// All valid msync(2) flag combinations (not including MS_INVALIDATE, which +// gVisor doesn't implement). constexpr std::initializer_list<int> kMsyncFlags = {MS_SYNC, MS_ASYNC, 0}; // Returns functions that return mappings that should be successfully @@ -133,15 +134,6 @@ TEST_P(MsyncFullParamTest, UnalignedAddressFails) { SyscallFailsWithErrno(EINVAL)); } -TEST_P(MsyncFullParamTest, InvalidateUnlockedSucceeds) { - auto m = ASSERT_NO_ERRNO_AND_VALUE(GetMapping()); - EXPECT_THAT(msync(m.ptr(), m.len(), msync_flags() | MS_INVALIDATE), - SyscallSucceeds()); -} - -// The test for MS_INVALIDATE on mlocked pages is in mlock.cc since it requires -// probing for mlock support. - INSTANTIATE_TEST_CASE_P( All, MsyncFullParamTest, ::testing::Combine(::testing::ValuesIn(kMsyncFlags), |