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2020-11-09Skip `EventHUp` notify in `FIN_WAIT2` on a socket close.Mithun Iyer
This Notify was added as part of cl/279106406; but notifying `EventHUp` in `FIN_WAIT2` is incorrect, as we want to only notify later on `TIME_WAIT` or a reset. However, we do need to notify any blocked waiters of an activity on the endpoint with `EventIn`|`EventOut`. PiperOrigin-RevId: 341490913
2020-11-09net: connect to the ipv4 localhost returns ENETUNREACH if the address isn't setAndrei Vagin
cl/340002915 modified the code to return EADDRNOTAVAIL if connect is called for a localhost address which isn't set. But actually, Linux returns EADDRNOTAVAIL for ipv6 addresses and ENETUNREACH for ipv4 addresses. Updates #4735 PiperOrigin-RevId: 341479129
2020-11-06Implement command GETNCNT for semctl.Jing Chen
PiperOrigin-RevId: 341154192
2020-11-06Fix infinite loop when splicing to pipes/eventfds.Nicolas Lacasse
Writes to pipes of size < PIPE_BUF are guaranteed to be atomic, so writes larger than that will return EAGAIN if the pipe has capacity < PIPE_BUF. Writes to eventfds will return EAGAIN if the write would cause the eventfd value to go over the max. In both such cases, calling Ready() on the FD will return true (because it is possible to write), but specific kinds of writes will in fact return EAGAIN. This CL fixes an infinite loop in splice and sendfile (VFS1 and VFS2) by forcing skipping the readiness check for the outfile in send, splice, and tee. PiperOrigin-RevId: 341102260
2020-11-06Do not send to the zero portGhanan Gowripalan
Port 0 is not meant to identify any remote port so attempting to send a packet to it should return an error. PiperOrigin-RevId: 341009528
2020-11-05Deflake semaphore_test.Jamie Liu
- Disable saving in tests that wait for EINTR. - Do not execute async-signal-unsafe code after fork() (see fork(2)'s manpage, "After a fork in a multithreaded program ...") - Check for errors returned by semctl(GETZCNT). PiperOrigin-RevId: 340901353
2020-11-02Implement command GETZCNT for semctl.Jing Chen
PiperOrigin-RevId: 340389884
2020-11-02Clean up the code of setupTimeWaitCloseAndrei Vagin
The active_closefd has to be shutdown only for write, otherwise the second poll will always return immediately. The second poll should not be called from a separate thread. PiperOrigin-RevId: 340319071
2020-11-01Fix returned error when deleting non-existant addressIan Lewis
PiperOrigin-RevId: 340149214
2020-10-31net/tcpip: connect to unset loopback address has to return EADDRNOTAVAILAndrei Vagin
In the docker container, the ipv6 loopback address is not set, and connect("::1") has to return ENEADDRNOTAVAIL in this case. Without this fix, it returns EHOSTUNREACH. PiperOrigin-RevId: 340002915
2020-10-30Separate kernel.Task.AsCopyContext() into CopyContext() and OwnCopyContext().Jamie Liu
kernel.copyContext{t} cannot be used outside of t's task goroutine, for three reasons: - t.CopyScratchBuffer() is task-goroutine-local. - Calling t.MemoryManager() without running on t's task goroutine or locking t.mu violates t.MemoryManager()'s preconditions. - kernel.copyContext passes t as context.Context to MM IO methods, which is illegal outside of t's task goroutine (cf. kernel.Task.Value()). Fix this by splitting AsCopyContext() into CopyContext() (which takes an explicit context.Context and is usable outside of the task goroutine) and OwnCopyContext() (which uses t as context.Context, but is only usable by t's task goroutine). PiperOrigin-RevId: 339933809
2020-10-28Merge pull request #2849 from lubinszARM:pr_memory_barriergVisor bot
PiperOrigin-RevId: 339504677
2020-10-27Wake up any waiters on an ICMP error on UDP socket.Bhasker Hariharan
This change wakes up any waiters when we receive an ICMP port unreachable control packet on an UDP socket as well as sets waiter.EventErr in the result returned by Readiness() when e.lastError is not nil. The latter is required where an epoll()/poll() is done after the error is already handled since we will never notify again in such cases. PiperOrigin-RevId: 339370469
2020-10-27Implement /proc/[pid]/memLennart
This PR implements /proc/[pid]/mem for `pkg/sentry/fs` (refer to #2716) and `pkg/sentry/fsimpl`. @majek COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/4060 from lnsp:proc-pid-mem 2caf9021254646f441be618a9bb5528610e44d43 PiperOrigin-RevId: 339369629
2020-10-27Add basic address deletion to netlinkIan Lewis
Updates #3921 PiperOrigin-RevId: 339195417
2020-10-26Implement command IPC_STAT for semctl.Jing Chen
PiperOrigin-RevId: 339166854
2020-10-26Fix SCM Rights S/R reference leak.Dean Deng
Control messages collected when peeking into a socket were being leaked. PiperOrigin-RevId: 339114961
2020-10-24Avoid excessive save/restore cycles in socket_ipv4_udp_unbound tests.Jamie Liu
PiperOrigin-RevId: 338805321
2020-10-23Support VFS2 save/restore.Jamie Liu
Inode number consistency checks are now skipped in save/restore tests for reasons described in greatest detail in StatTest.StateDoesntChangeAfterRename. They pass in VFS1 due to the bug described in new test case SimpleStatTest.DifferentFilesHaveDifferentDeviceInodeNumberPairs. Fixes #1663 PiperOrigin-RevId: 338776148
2020-10-23Fix socket_ipv4_udp_unbound_loopback_test_linuxZach Koopmans
Handle "Resource temporarily unavailable" EAGAIN errors with a select call before calling recvmsg. Also rename similar helper call from "RecvMsgTimeout" to "RecvTimeout", because it calls "recv". PiperOrigin-RevId: 338761695
2020-10-23Support getsockopt for SO_ACCEPTCONN.Nayana Bidari
The SO_ACCEPTCONN option is used only on getsockopt(). When this option is specified, getsockopt() indicates whether socket listening is enabled for the socket. A value of zero indicates that socket listening is disabled; non-zero that it is enabled. PiperOrigin-RevId: 338703206
2020-10-23Decrement e.synRcvdCount once handshake is complete.Bhasker Hariharan
Earlier the count was dropped only after calling e.deliverAccepted. This lead to an issue where there were no connections in SYN-RCVD state for the listening endpoint but e.synRcvdCount would not be zero because it was being reduced only when handleSynSegment returned after deliverAccepted returned. This issue is seen when the Nth SYN for a listen backlog of size N which would cause the listen backlog to be full gets dropped occasionally. This happens when the new SYN comes at when the previous completed endpoint has been delivered to the accept queue but the synRcvdCount hasn't yet been decremented because the goroutine running handleSynSegment has not yet completed. PiperOrigin-RevId: 338690646
2020-10-23Rewrite reference leak checker without finalizers.Dean Deng
Our current reference leak checker uses finalizers to verify whether an object has reached zero references before it is garbage collected. There are multiple problems with this mechanism, so a rewrite is in order. With finalizers, there is no way to guarantee that a finalizer will run before the program exits. When an unreachable object with a finalizer is garbage collected, its finalizer will be added to a queue and run asynchronously. The best we can do is run garbage collection upon sandbox exit to make sure that all finalizers are enqueued. Furthermore, if there is a chain of finalized objects, e.g. A points to B points to C, garbage collection needs to run multiple times before all of the finalizers are enqueued. The first GC run will register the finalizer for A but not free it. It takes another GC run to free A, at which point B's finalizer can be registered. As a result, we need to run GC as many times as the length of the longest such chain to have a somewhat reliable leak checker. Finally, a cyclical chain of structs pointing to one another will never be garbage collected if a finalizer is set. This is a well-known issue with Go finalizers (https://github.com/golang/go/issues/7358). Using leak checking on filesystem objects that produce cycles will not work and even result in memory leaks. The new leak checker stores reference counted objects in a global map when leak check is enabled and removes them once they are destroyed. At sandbox exit, any remaining objects in the map are considered as leaked. This provides a deterministic way of detecting leaks without relying on the complexities of finalizers and garbage collection. This approach has several benefits over the former, including: - Always detects leaks of objects that should be destroyed very close to sandbox exit. The old checker very rarely detected these leaks, because it relied on garbage collection to be run in a short window of time. - Panics if we forgot to enable leak check on a ref-counted object (we will try to remove it from the map when it is destroyed, but it will never have been added). - Can store extra logging information in the map values without adding to the size of the ref count struct itself. With the size of just an int64, the ref count object remains compact, meaning frequent operations like IncRef/DecRef are more cache-efficient. - Can aggregate leak results in a single report after the sandbox exits. Instead of having warnings littered in the log, which were non-deterministically triggered by garbage collection, we can print all warning messages at once. Note that this could also be a limitation--the sandbox must exit properly for leaks to be detected. Some basic benchmarking indicates that this change does not significantly affect performance when leak checking is enabled, which is understandable since registering/unregistering is only done once for each filesystem object. Updates #1486. PiperOrigin-RevId: 338685972
2020-10-19Fix runsc tests on VFS2 overlay.Jamie Liu
- Check the sticky bit in overlay.filesystem.UnlinkAt(). Fixes StickyTest.StickyBitPermDenied. - When configuring a VFS2 overlay in runsc, copy the lower layer's root owner/group/mode to the upper layer's root (as in the VFS1 equivalent, boot.addOverlay()). This makes the overlay root owned by UID/GID 65534 with mode 0755 rather than owned by UID/GID 0 with mode 01777. Fixes CreateTest.CreateFailsOnUnpermittedDir, which assumes that the test cannot create files in /. - MknodTest.UnimplementedTypesReturnError assumes that the creation of device special files is not supported. However, while the VFS2 gofer client still doesn't support device special files, VFS2 tmpfs does, and in the overlay test dimension mknod() targets a tmpfs upper layer. The test initially has all capabilities, including CAP_MKNOD, so its creation of these files succeeds. Constrain these tests to VFS1. - Rename overlay.nonDirectoryFD to overlay.regularFileFD and only use it for regular files, using the original FD for pipes and device special files. This is more consistent with Linux (which gets the original inode_operations, and therefore file_operations, for these file types from ovl_fill_inode() => init_special_inode()) and fixes remaining mknod and pipe tests. - Read/write 1KB at a time in PipeTest.Streaming, rather than 4 bytes. This isn't strictly necessary, but it makes the test less obnoxiously slow on ptrace. Fixes #4407 PiperOrigin-RevId: 337971042
2020-10-16Use POSIX interval timers in flock test.Dean Deng
ualarm(2) is obsolete. Move IntervalTimer into a test util, where it can be used by flock tests. These tests were flaky with TSAN, probably because it slowed the tests down enough that the alarm was expiring before flock() was called. Use an interval timer so that even if we miss the first alarm (or more), flock() is still guaranteed to be interrupted. PiperOrigin-RevId: 337578751
2020-10-15sockets: ignore io.EOF from view.ReadAtAndrei Vagin
Reported-by: syzbot+5466463b7604c2902875@syzkaller.appspotmail.com PiperOrigin-RevId: 337451896
2020-10-09TCP Receive window advertisement fixes.Bhasker Hariharan
The fix in commit 028e045da93b7c1c26417e80e4b4e388b86a713d was incorrect as it can cause the right edge of the window to shrink when we announce a zero window due to receive buffer being full as its done before the check for seeing if the window is being shrunk because of the selected window. Further the window was calculated purely on available space but in cases where we are getting full sized segments it makes more sense to use the actual bytes being held. This CL changes to use the lower of the total available space vs the available space in the maximal window we could advertise minus the actual payload bytes being held. This change also cleans up the code so that the window selection logic is not duplicated between getSendParams() and windowCrossedACKThresholdLocked. PiperOrigin-RevId: 336404827
2020-10-09test/syscall/iptables: don't use designated initializersAndrei Vagin
test/syscalls/linux/iptables.cc:130:3: error: C99 designator 'name' outside aggregate initializer 130 | }; | PiperOrigin-RevId: 336331738
2020-10-06Implement membarrier(2) commands other than *_SYNC_CORE.Jamie Liu
Updates #267 PiperOrigin-RevId: 335713923
2020-10-03Fix kcov enabling and disabling procedures.Dean Deng
- When the KCOV_ENABLE_TRACE ioctl is called with the trace kind KCOV_TRACE_PC, the kcov mode should be set to KCOV_*MODE*_TRACE_PC. - When the owning task of kcov exits, the memory mapping should not be cleared so it can be used by other tasks. - Add more tests (also tested on native Linux kcov). PiperOrigin-RevId: 335202585
2020-09-30ip6tables: redirect supportKevin Krakauer
Adds support for the IPv6-compatible redirect target. Redirection is a limited form of DNAT, where the destination is always the localhost. Updates #3549. PiperOrigin-RevId: 334698344
2020-09-30avoid the random memory barrier issue in mmap testing on Arm64Bin Lu
There is a new random issue on some Arm64 machines. This scene can be summarized as following: Sometimes, the content of the func() pointer is still 0 opcode. The probability of this kind of issue is very low, currently only available on some machines. After inserting a simple memory barrier, this issue was gone. The code to directly use the memory barrier is as follows: memcpy(reinterpret_cast<void*>(addr), machine_code, sizeof(machine_code)); isb() func = reinterpret_cast<uint32_t (*)(void)>(addr); Signed-off-by: Bin Lu <bin.lu@arm.com>
2020-09-29Add /proc/[pid]/cwdFabricio Voznika
PiperOrigin-RevId: 334478850
2020-09-29iptables: refactor to make targets extendableKevin Krakauer
Like matchers, targets should use a module-like register/lookup system. This replaces the brittle switch statements we had before. The only behavior change is supporing IPT_GET_REVISION_TARGET. This makes it much easier to add IPv6 redirect in the next change. Updates #3549. PiperOrigin-RevId: 334469418
2020-09-29Migrates uses of deprecated map types to recommended types.gVisor bot
PiperOrigin-RevId: 334419854
2020-09-28Fix lingering of TCP socket in the initial state.Nayana Bidari
When the socket is set with SO_LINGER and close()'d in the initial state, it should not linger and return immediately. PiperOrigin-RevId: 334263149
2020-09-28Support inotify in overlayfs.Dean Deng
Fixes #1479, #317. PiperOrigin-RevId: 334258052
2020-09-27Clean up kcov.Dean Deng
Previously, we did not check the kcov mode when performing task work. As a result, disabling kcov did not do anything. Also avoid expensive atomic RMW when consuming coverage data. We don't need the swap if the value is already zero (which is most of the time), and it is ok if there are slight inconsistencies due to a race between coverage data generation (incrementing the value) and consumption (reading a nonzero value and writing zero). PiperOrigin-RevId: 334049207
2020-09-24test/syscall/mknod: Don't use a hard-coded file nameAndrei Vagin
PiperOrigin-RevId: 333461380
2020-09-23Clean up inotify tests.Dean Deng
Mostly simplifies SKIP_IF statements and adds some more documentation. Also, mknod is now supported by gofer fs, so remove SKIP_IFs related to this. PiperOrigin-RevId: 333449932
2020-09-21Receive ACK when deleting address in syscall testsGhanan Gowripalan
PiperOrigin-RevId: 332961666
2020-09-21Fix socket_ipv4_udp_unbound_test_native in opensource.Zach Koopmans
Calls to recv sometimes fail with EAGAIN, so call select beforehand. PiperOrigin-RevId: 332943156
2020-09-21Fix proc_net_test_native for native tests.Zach Koopmans
"DefaultValueEqZero" is only valid if the test is in a sandbox. Our CI VMs often have "/proc/sys/net/ipv4/ip_forward" set to 1. PiperOrigin-RevId: 332910859
2020-09-21Add ftruncate test for writeable fd but no write permissions.Dean Deng
PiperOrigin-RevId: 332907453
2020-09-21Fix flakes in UdpSocketTestZach Koopmans
`recv` calls with MSG_DONTWAIT can fail with EAGAIN randomly in tests. Fix this by calling `select` on sockets with a timeout prior to attempting a `recv`. PiperOrigin-RevId: 332873735
2020-09-20Merge pull request #3651 from ianlewis:ip-forwardinggVisor bot
PiperOrigin-RevId: 332760843
2020-09-18Disable vdso_clock_gettime on KVM.Jamie Liu
Unfortunately, I think TSC misalignment means that we can't really expect any consistent correspondence between a TSC-based VDSO and the sentry's view of time on the KVM platform. PiperOrigin-RevId: 332576147
2020-09-18Deflake stat_test with save/restore enabled.Nicolas Lacasse
PiperOrigin-RevId: 332546659
2020-09-18Implement fsimpl/overlay.filesystem.RenameAt.Jamie Liu
Updates #1199 PiperOrigin-RevId: 332539197
2020-09-18Use a tmpfs file for shared anonymous and /dev/zero mmap on VFS2.Jamie Liu
This is more consistent with Linux (see comment on MM.NewSharedAnonMappable()). We don't do the same thing on VFS1 for reasons documented by the updated comment. PiperOrigin-RevId: 332514849
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