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2020-11-17Fix possible deadlock in UDP.Write().Bhasker Hariharan
In UDP endpoint.Write() sendUDP is called with e.mu Rlocked. But if this happens to send a datagram over loopback which ends up generating an ICMP response of say ErrNoPortReachable, the handling of the response in HandleControlPacket also acquires e.mu using RLock. This is mostly fine unless there is a competing caller trying to acquire e.mu in exclusive mode using Lock(). This will deadlock as a caller waiting in Lock() disallows an new RLocks() to ensure it can actually acquire the Lock. This is documented here https://golang.org/pkg/sync/#RWMutex. This change releases the endpoint mutex before calling sendUDP to resolve the possibility of the deadlock. Reported-by: syzbot+537989797548c66e8ee3@syzkaller.appspotmail.com Reported-by: syzbot+eb0b73b4ab486f7673ba@syzkaller.appspotmail.com PiperOrigin-RevId: 342894148
2020-11-17Fix SO_ERROR behavior for TCP in gVisor.Bhasker Hariharan
Fixes the behaviour of SO_ERROR for tcp sockets where in linux it returns sk->sk_err and if sk->sk_err is 0 then it returns sk->sk_soft_err. In gVisor TCP we endpoint.HardError is the equivalent of sk->sk_err and endpoint.LastError holds soft errors. This change brings this into alignment with Linux such that both hard/soft errors are cleared when retrieved using getsockopt(.. SO_ERROR) is called on a socket. Fixes #3812 PiperOrigin-RevId: 342868552
2020-11-16Reset watchdog timer between sendfile() iterations.Jamie Liu
As part of this, change Task.interrupted() to not drain Task.interruptChan, and do so explicitly using new function Task.unsetInterrupted() instead. PiperOrigin-RevId: 342768365
2020-11-16Remove ARP address workaroundGhanan Gowripalan
- Make AddressableEndpoint optional for NetworkEndpoint. Not all NetworkEndpoints need to support addressing (e.g. ARP), so AddressableEndpoint should only be implemented for protocols that support addressing such as IPv4 and IPv6. With this change, tcpip.ErrNotSupported will be returned by the stack when attempting to modify addresses on a network endpoint that does not support addressing. Now that packets are fully handled at the network layer, and (with this change) addresses are optional for network endpoints, we no longer need the workaround for ARP where a fake ARP address was added to each NIC that performs ARP so that packets would be delivered to the ARP layer. PiperOrigin-RevId: 342722547
2020-11-16Add packetimpact tests for ICMPv6 Error message for fragmentToshi Kikuchi
Updates #4427 PiperOrigin-RevId: 342703931
2020-11-13Requested Comment/Message wording changesJulian Elischer
PiperOrigin-RevId: 342366891
2020-11-13Disable save/restore in PartialBadBufferTest.SendMsgTCP.Jamie Liu
PiperOrigin-RevId: 342314586
2020-11-12Deflake tcp_socket test.Mithun Iyer
Increase the wait time for the thread to be blocked on read/write syscall. PiperOrigin-RevId: 342204627
2020-11-12Refactor SOL_SOCKET optionsNayana Bidari
Store all the socket level options in a struct and call {Get/Set}SockOpt on this struct. This will avoid implementing socket level options on all endpoints. This CL contains implementing one socket level option for tcp and udp endpoints. PiperOrigin-RevId: 342203981
2020-11-12Change AllocationSize to SizeWithPadding as requestedJulian Elischer
RELNOTES: n/a PiperOrigin-RevId: 342176296
2020-11-11Teach netstack how to add options to IPv4 packetsJulian Elischer
Most packets don't have options but they are an integral part of the standard. Teaching the ipv4 code how to handle them will simplify future testing and use. Because Options are so rare it is worth making sure that the extra work is kept out of the fast path as much as possible. Prior to this change, all usages of the IHL field of the IPv4Fields/Encode system set it to the same constant value except in a couple of tests for bad values. From this change IHL will not be a constant as it will depend on the size of any Options. Since ipv4.Encode() now handles the options it becomes a possible source of errors to let the callers set this value, so remove it entirely and calculate the value from the size of the Options if present (or not) therefore guaranteeing a correct value. Fixes #4709 RELNOTES: n/a PiperOrigin-RevId: 341864765
2020-11-10Add debug logs to startup benchmark.Zach Koopmans
PiperOrigin-RevId: 341757694
2020-11-10Internal changeJamie Liu
PiperOrigin-RevId: 341732791
2020-11-10Add all base and fs tests to Continuous Tests.Zach Koopmans
PiperOrigin-RevId: 341660511
2020-11-09Additions to ICMP and IPv4 parsersJulian Elischer
Teach ICMP.Parser/ToBytes to handle some non echo ICMP packets. Teach IPv4.Parser that fragments only have a payload, not an upper layer. Fix IPv4 and IPv6 reassembly tests to handle the change. Fixes #4758 PiperOrigin-RevId: 341549665
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
2020-11-09parameterize regexp in netdevs.ParseDevicesZeling Feng
PiperOrigin-RevId: 341470647
2020-11-09iptables: add documentation about enabing docker ipv6Kevin Krakauer
PiperOrigin-RevId: 341439435
2020-11-06Merge pull request #4719 from zhlhahaha:2005gVisor bot
PiperOrigin-RevId: 341172694
2020-11-06Change size of startup benchmark and lower number of startups.Zach Koopmans
PiperOrigin-RevId: 341155693
2020-11-06[vfs] Return EEXIST when file already exists and rp.MustBeDir() is true.Ayush Ranjan
This is consistent with what Linux does. This was causing a PHP runtime test failure. Fixed it for VFS2. PiperOrigin-RevId: 341155209
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
2020-11-05[runtime tests] Add partitions to runtime tests.Ayush Ranjan
This will allow us to run massive runtime tests live java to run in parallel across multiple jobs. PiperOrigin-RevId: 340956246
2020-11-05Fix failure setting OOM score adjustmentFabricio Voznika
When OOM score adjustment needs to be set, all the containers need to be loaded to find all containers that belong to the sandbox. However, each load signals the container to ensure it is still alive. OOM score adjustment is set during creation and deletion of every container, generating a flood of signals to all containers. The fix removes the signal check when it's not needed. There is also a race fetching OOM score adjustment value from the parent when the sandbox exits at the same time (the time it took to signal containers above made this window quite large). The fix is to store the original value in the sandbox state file and use it when the value needs to be restored. Also add more logging and made the existing ones more consistent to help with debugging. PiperOrigin-RevId: 340940799
2020-11-05[runtime tests] Exclude ext/pcre/tests/cache_limit.phpt.Ayush Ranjan
PiperOrigin-RevId: 340925131
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
2020-11-04Make the regex for inet6Line in packetimpact/netdevs more accurateZeling Feng
PiperOrigin-RevId: 340763455
2020-11-02Implement command GETZCNT for semctl.Jing Chen
PiperOrigin-RevId: 340389884
2020-11-03ARM64:fuse:alian stat struct order on multiarchHoward Zhang
fields order in stat struct is different from x86 to arm64. Please refer to x86_64-linux-gnu/bits/stat.h aarch64-linux-gnu/bits/stat.h Signed-off-by: Howard Zhang <howard.zhang@arm.com>
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
2020-11-02Block external network for testsAndrei Vagin
And in this case, tests will run in separate network namespaces and will not affect each other. PiperOrigin-RevId: 340267734
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
2020-10-29Add IPv4 reassembly packetimpact testArthur Sfez
The IPv6 reassembly test was also refactored to be easily extended with more cases. PiperOrigin-RevId: 339768605
2020-10-29Add support for bare IPv4 in packetimpact testsArthur Sfez
PiperOrigin-RevId: 339699771
2020-10-28Add the payload directly to the ICMPv4 typeArthur Sfez
This makes handling inbound fragmented packets easier, because a fragmented packet might not have an actual ICMP header but only a payload. After this change, the ICMPv4 is the last layer you can get because the payload is embedded in it. Note that this makes it consistent with the ICMPv6 implementation. While I'm here, I've also added the Ident and Sequence fields on the ICMPv4 type. Defaults are still zero. PiperOrigin-RevId: 339577094
2020-10-28Merge pull request #2849 from lubinszARM:pr_memory_barriergVisor bot
PiperOrigin-RevId: 339504677
2020-10-28Bump honnef.co/go/tools to v0.0.1-2020.1.6Ting-Yu Wang
PiperOrigin-RevId: 339476515
2020-10-28[runtime tests] Unexclude fixed test.Ayush Ranjan
#4641 fixed the PHP runtime test ext/standard/tests/network/bug20134.phpt. We should start testing it again. Also excluded another flaky test. Seems like a test bug. PiperOrigin-RevId: 339475716
2020-10-28Merge pull request #4543 from lubinszARM:pr_test_sigaltstackgVisor bot
PiperOrigin-RevId: 339459247
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
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