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-rw-r--r--test/syscalls/linux/shm.cc189
1 files changed, 123 insertions, 66 deletions
diff --git a/test/syscalls/linux/shm.cc b/test/syscalls/linux/shm.cc
index 9f57476c9..9d6d636d5 100644
--- a/test/syscalls/linux/shm.cc
+++ b/test/syscalls/linux/shm.cc
@@ -33,14 +33,6 @@ using ::testing::_;
const uint64_t kAllocSize = kPageSize * 128ULL;
-PosixErrorOr<int> Shmget(key_t key, size_t size, int shmflg) {
- int id = shmget(key, size, shmflg);
- if (id == -1) {
- return PosixError(errno, "shmget() failed");
- }
- return id;
-}
-
PosixErrorOr<char*> Shmat(int shmid, const void* shmaddr, int shmflg) {
const intptr_t addr =
reinterpret_cast<intptr_t>(shmat(shmid, shmaddr, shmflg));
@@ -67,57 +59,109 @@ PosixErrorOr<int> Shmctl(int shmid, int cmd, T* buf) {
return ret;
}
+// ShmSegment is a RAII object for automatically cleaning up shm segments.
+class ShmSegment {
+ public:
+ explicit ShmSegment(int id) : id_(id) {}
+
+ ~ShmSegment() {
+ if (id_ >= 0) {
+ EXPECT_NO_ERRNO(Rmid());
+ id_ = -1;
+ }
+ }
+
+ ShmSegment(ShmSegment&& other) : id_(other.release()) {}
+
+ ShmSegment& operator=(ShmSegment&& other) {
+ id_ = other.release();
+ return *this;
+ }
+
+ ShmSegment(ShmSegment const& other) = delete;
+ ShmSegment& operator=(ShmSegment const& other) = delete;
+
+ int id() const { return id_; }
+
+ int release() {
+ int id = id_;
+ id_ = -1;
+ return id;
+ }
+
+ PosixErrorOr<int> Rmid() {
+ RETURN_IF_ERRNO(Shmctl<void>(id_, IPC_RMID, nullptr));
+ return release();
+ }
+
+ private:
+ int id_ = -1;
+};
+
+PosixErrorOr<int> ShmgetRaw(key_t key, size_t size, int shmflg) {
+ int id = shmget(key, size, shmflg);
+ if (id == -1) {
+ return PosixError(errno, "shmget() failed");
+ }
+ return id;
+}
+
+PosixErrorOr<ShmSegment> Shmget(key_t key, size_t size, int shmflg) {
+ ASSIGN_OR_RETURN_ERRNO(int id, ShmgetRaw(key, size, shmflg));
+ return ShmSegment(id);
+}
+
TEST(ShmTest, AttachDetach) {
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ const ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
struct shmid_ds attr;
- ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_STAT, &attr));
EXPECT_EQ(attr.shm_segsz, kAllocSize);
EXPECT_EQ(attr.shm_nattch, 0);
- const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
- ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
+ const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_STAT, &attr));
EXPECT_EQ(attr.shm_nattch, 1);
- const char* addr2 = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
- ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
+ const char* addr2 = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_STAT, &attr));
EXPECT_EQ(attr.shm_nattch, 2);
ASSERT_NO_ERRNO(Shmdt(addr));
- ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_STAT, &attr));
EXPECT_EQ(attr.shm_nattch, 1);
ASSERT_NO_ERRNO(Shmdt(addr2));
- ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_STAT, &attr));
EXPECT_EQ(attr.shm_nattch, 0);
}
TEST(ShmTest, LookupByKey) {
const TempPath keyfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
const key_t key = ftok(keyfile.path().c_str(), 1);
- const int id =
+ const ShmSegment shm =
ASSERT_NO_ERRNO_AND_VALUE(Shmget(key, kAllocSize, IPC_CREAT | 0777));
- const int id2 = ASSERT_NO_ERRNO_AND_VALUE(Shmget(key, kAllocSize, 0777));
- EXPECT_EQ(id, id2);
+ const int id2 = ASSERT_NO_ERRNO_AND_VALUE(ShmgetRaw(key, kAllocSize, 0777));
+ EXPECT_EQ(shm.id(), id2);
}
TEST(ShmTest, DetachedSegmentsPersist) {
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ const ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
+ char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
addr[0] = 'x';
ASSERT_NO_ERRNO(Shmdt(addr));
// We should be able to re-attach to the same segment and get our data back.
- addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
+ addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
EXPECT_EQ(addr[0], 'x');
ASSERT_NO_ERRNO(Shmdt(addr));
}
TEST(ShmTest, MultipleDetachFails) {
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ const ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
+ const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
ASSERT_NO_ERRNO(Shmdt(addr));
EXPECT_THAT(Shmdt(addr), PosixErrorIs(EINVAL, _));
}
@@ -128,7 +172,7 @@ TEST(ShmTest, IpcStat) {
const time_t start = time(nullptr);
- const int id =
+ const ShmSegment shm =
ASSERT_NO_ERRNO_AND_VALUE(Shmget(key, kAllocSize, IPC_CREAT | 0777));
const uid_t uid = getuid();
@@ -136,7 +180,7 @@ TEST(ShmTest, IpcStat) {
const pid_t pid = getpid();
struct shmid_ds attr;
- ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_STAT, &attr));
EXPECT_EQ(attr.shm_perm.__key, key);
EXPECT_EQ(attr.shm_perm.uid, uid);
@@ -163,8 +207,8 @@ TEST(ShmTest, IpcStat) {
absl::SleepFor(absl::Seconds(1));
const time_t pre_attach = time(nullptr);
- const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
- ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
+ const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_STAT, &attr));
EXPECT_GE(attr.shm_atime, pre_attach);
EXPECT_EQ(attr.shm_dtime, 0);
@@ -176,7 +220,7 @@ TEST(ShmTest, IpcStat) {
const time_t pre_detach = time(nullptr);
ASSERT_NO_ERRNO(Shmdt(addr));
- ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_STAT, &attr));
EXPECT_LT(attr.shm_atime, pre_detach);
EXPECT_GE(attr.shm_dtime, pre_detach);
@@ -191,7 +235,8 @@ TEST(ShmTest, ShmStat) {
// general Linux host.
SKIP_IF(!IsRunningOnGvisor());
- ASSERT_NO_ERRNO(Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
+ const ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
+ Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
struct shmid_ds attr;
ASSERT_NO_ERRNO(Shmctl(1, SHM_STAT, &attr));
// This does the same thing as IPC_STAT, so only test that the syscall
@@ -225,14 +270,14 @@ TEST(ShmTest, ShmInfo) {
EXPECT_EQ(info.shm_swp, 0);
}
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ const ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
+ const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
ASSERT_NO_ERRNO(Shmctl(1, SHM_INFO, &info));
if (IsRunningOnGvisor()) {
- ASSERT_NO_ERRNO(Shmctl(id, SHM_INFO, &info));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), SHM_INFO, &info));
EXPECT_EQ(info.used_ids, 1);
EXPECT_EQ(info.shm_tot, kAllocSize / kPageSize);
EXPECT_EQ(info.shm_rss, kAllocSize / kPageSize);
@@ -243,28 +288,28 @@ TEST(ShmTest, ShmInfo) {
}
TEST(ShmTest, ShmCtlSet) {
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ const ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
+ const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
struct shmid_ds attr;
- ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_STAT, &attr));
ASSERT_EQ(attr.shm_perm.mode, 0777);
attr.shm_perm.mode = 0766;
- ASSERT_NO_ERRNO(Shmctl(id, IPC_SET, &attr));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_SET, &attr));
- ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
+ ASSERT_NO_ERRNO(Shmctl(shm.id(), IPC_STAT, &attr));
ASSERT_EQ(attr.shm_perm.mode, 0766);
ASSERT_NO_ERRNO(Shmdt(addr));
}
TEST(ShmTest, RemovedSegmentsAreMarkedDeleted) {
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
- ASSERT_NO_ERRNO(Shmctl<void>(id, IPC_RMID, nullptr));
+ const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
+ const int id = ASSERT_NO_ERRNO_AND_VALUE(shm.Rmid());
struct shmid_ds attr;
ASSERT_NO_ERRNO(Shmctl(id, IPC_STAT, &attr));
EXPECT_NE(attr.shm_perm.mode & SHM_DEST, 0);
@@ -272,29 +317,32 @@ TEST(ShmTest, RemovedSegmentsAreMarkedDeleted) {
}
TEST(ShmTest, RemovedSegmentsAreDestroyed) {
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
+ const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
const uint64_t alloc_pages = kAllocSize / kPageSize;
struct shm_info info;
- ASSERT_NO_ERRNO(Shmctl(1, SHM_INFO, &info));
+ ASSERT_NO_ERRNO(Shmctl(0 /*ignored*/, SHM_INFO, &info));
const uint64_t before = info.shm_tot;
- ASSERT_NO_ERRNO(Shmctl<void>(id, IPC_RMID, nullptr));
+ ASSERT_NO_ERRNO(shm.Rmid());
ASSERT_NO_ERRNO(Shmdt(addr));
- ASSERT_NO_ERRNO(Shmctl(1, SHM_INFO, &info));
- const uint64_t after = info.shm_tot;
- EXPECT_EQ(after, before - alloc_pages);
+ ASSERT_NO_ERRNO(Shmctl(0 /*ignored*/, SHM_INFO, &info));
+ if (IsRunningOnGvisor()) {
+ // No guarantees on system-wide shm memory usage on a generic linux host.
+ const uint64_t after = info.shm_tot;
+ EXPECT_EQ(after, before - alloc_pages);
+ }
}
TEST(ShmTest, AllowsAttachToRemovedSegmentWithRefs) {
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
- ASSERT_NO_ERRNO(Shmctl<void>(id, IPC_RMID, nullptr));
+ const char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
+ const int id = ASSERT_NO_ERRNO_AND_VALUE(shm.Rmid());
const char* addr2 = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
ASSERT_NO_ERRNO(Shmdt(addr));
ASSERT_NO_ERRNO(Shmdt(addr2));
@@ -303,17 +351,17 @@ TEST(ShmTest, AllowsAttachToRemovedSegmentWithRefs) {
TEST(ShmTest, RemovedSegmentsAreNotDiscoverable) {
const TempPath keyfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
const key_t key = ftok(keyfile.path().c_str(), 1);
- const int id =
+ ShmSegment shm =
ASSERT_NO_ERRNO_AND_VALUE(Shmget(key, kAllocSize, IPC_CREAT | 0777));
- ASSERT_NO_ERRNO(Shmctl<void>(id, IPC_RMID, nullptr));
+ ASSERT_NO_ERRNO(shm.Rmid());
EXPECT_THAT(Shmget(key, kAllocSize, 0777), PosixErrorIs(ENOENT, _));
}
TEST(ShmDeathTest, ReadonlySegment) {
SetupGvisorDeathTest();
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ const ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, SHM_RDONLY));
+ char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, SHM_RDONLY));
// Reading succeeds.
static_cast<void>(addr[0]);
// Writing fails.
@@ -329,9 +377,16 @@ TEST(ShmDeathTest, SegmentNotAccessibleAfterDetach) {
SetupGvisorDeathTest();
const auto rest = [&] {
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
+ char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
+
+ // Mark the segment as destroyed so it's automatically cleaned up when we
+ // crash below. We can't rely on the standard cleanup since the destructor
+ // will not run after the SIGSEGV. Note that this doesn't destroy the
+ // segment immediately since we're still attached to it.
+ ASSERT_NO_ERRNO(shm.Rmid());
+
addr[0] = 'x';
ASSERT_NO_ERRNO(Shmdt(addr));
@@ -366,7 +421,7 @@ TEST(ShmTest, RequestingUnalignedSizeSucceeds) {
TEST(ShmTest, RequestingDuplicateCreationFails) {
const TempPath keyfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
const key_t key = ftok(keyfile.path().c_str(), 1);
- ASSERT_NO_ERRNO_AND_VALUE(
+ const ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(key, kAllocSize, IPC_CREAT | IPC_EXCL | 0777));
EXPECT_THAT(Shmget(key, kAllocSize, IPC_CREAT | IPC_EXCL | 0777),
PosixErrorIs(EEXIST, _));
@@ -377,16 +432,17 @@ TEST(ShmTest, SegmentsSizeFixedOnCreation) {
const key_t key = ftok(keyfile.path().c_str(), 1);
// Base segment.
- const int id =
+ const ShmSegment shm =
ASSERT_NO_ERRNO_AND_VALUE(Shmget(key, kAllocSize, IPC_CREAT | 0777));
// Ask for the same segment at half size. This succeeds.
- const int id2 = ASSERT_NO_ERRNO_AND_VALUE(Shmget(key, kAllocSize / 2, 0777));
+ const int id2 =
+ ASSERT_NO_ERRNO_AND_VALUE(ShmgetRaw(key, kAllocSize / 2, 0777));
// Ask for the same segment at double size.
EXPECT_THAT(Shmget(key, kAllocSize * 2, 0777), PosixErrorIs(EINVAL, _));
- char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
+ char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
char* addr2 = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id2, nullptr, 0));
// We have 2 different maps...
@@ -402,9 +458,9 @@ TEST(ShmTest, SegmentsSizeFixedOnCreation) {
}
TEST(ShmTest, PartialUnmap) {
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ const ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
+ char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
EXPECT_THAT(munmap(addr + (kAllocSize / 4), kAllocSize / 2),
SyscallSucceeds());
ASSERT_NO_ERRNO(Shmdt(addr));
@@ -417,15 +473,16 @@ TEST(ShmTest, GracefullyFailOnZeroLenSegmentCreation) {
}
TEST(ShmTest, NoDestructionOfAttachedSegmentWithMultipleRmid) {
- const int id = ASSERT_NO_ERRNO_AND_VALUE(
+ ShmSegment shm = ASSERT_NO_ERRNO_AND_VALUE(
Shmget(IPC_PRIVATE, kAllocSize, IPC_CREAT | 0777));
- char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
- char* addr2 = ASSERT_NO_ERRNO_AND_VALUE(Shmat(id, nullptr, 0));
+ char* addr = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
+ char* addr2 = ASSERT_NO_ERRNO_AND_VALUE(Shmat(shm.id(), nullptr, 0));
// There should be 2 refs to the segment from the 2 attachments, and a single
// self-reference. Mark the segment as destroyed more than 3 times through
// shmctl(RMID). If there's a bug with the ref counting, this should cause the
// count to drop to zero.
+ int id = shm.release();
for (int i = 0; i < 6; ++i) {
ASSERT_NO_ERRNO(Shmctl<void>(id, IPC_RMID, nullptr));
}
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