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2018-09-19Fix RTT estimation when timestamp option is enabled.Bhasker Hariharan
From RFC7323#Section-4 The [RFC6298] RTT estimator has weighting factors, alpha and beta, based on an implicit assumption that at most one RTTM will be sampled per RTT. When multiple RTTMs per RTT are available to update the RTT estimator, an implementation SHOULD try to adhere to the spirit of the history specified in [RFC6298]. An implementation suggestion is detailed in Appendix G. From RFC7323#appendix-G Appendix G. RTO Calculation Modification Taking multiple RTT samples per window would shorten the history calculated by the RTO mechanism in [RFC6298], and the below algorithm aims to maintain a similar history as originally intended by [RFC6298]. It is roughly known how many samples a congestion window worth of data will yield, not accounting for ACK compression, and ACK losses. Such events will result in more history of the path being reflected in the final value for RTO, and are uncritical. This modification will ensure that a similar amount of time is taken into account for the RTO estimation, regardless of how many samples are taken per window: ExpectedSamples = ceiling(FlightSize / (SMSS * 2)) alpha' = alpha / ExpectedSamples beta' = beta / ExpectedSamples Note that the factor 2 in ExpectedSamples is due to "Delayed ACKs". Instead of using alpha and beta in the algorithm of [RFC6298], use alpha' and beta' instead: RTTVAR <- (1 - beta') * RTTVAR + beta' * |SRTT - R'| SRTT <- (1 - alpha') * SRTT + alpha' * R' (for each sample R') PiperOrigin-RevId: 213644795 Change-Id: I52278b703540408938a8edb8c38be97b37f4a10e
2018-09-18Added state machine checks for Container.StatusFabricio Voznika
For my own sanitity when thinking about possible transitions and state. PiperOrigin-RevId: 213559482 Change-Id: I25588c86cf6098be4eda01f4e7321c102ceef33c
2018-09-18Short-circuit Readdir calls on overlay files when the dirent is frozen.Nicolas Lacasse
If we have an overlay file whose corresponding Dirent is frozen, then we should not bother calling Readdir on the upper or lower files, since DirentReaddir will calculate children based on the frozen Dirent tree. A test was added that fails without this change. PiperOrigin-RevId: 213531215 Change-Id: I4d6c98f1416541a476a34418f664ba58f936a81d
2018-09-18Handle children processes better in testsFabricio Voznika
Reap children more systematically in container tests. Previously, container_test was taking ~5 mins to run because constainer.Destroy() would timeout waiting for the sandbox process to exit. Now the test running in less than a minute. Also made the contract around Container and Sandbox destroy clearer. PiperOrigin-RevId: 213527471 Change-Id: Icca84ee1212bbdcb62bdfc9cc7b71b12c6d1688d
2018-09-18Increase state test timeoutMichael Pratt
PiperOrigin-RevId: 213519378 Change-Id: Iffdb987da3a7209a297ea2df171d2ae5fa9b2b34
2018-09-18Automated rollback of changelist 213307171Kevin Krakauer
PiperOrigin-RevId: 213504354 Change-Id: Iadd42f0ca4b7e7a9eae780bee9900c7233fb4f3f
2018-09-18Allow for MSG_CTRUNC in input flags for recv.Brian Geffon
PiperOrigin-RevId: 213481363 Change-Id: I8150ea20cebeb207afe031ed146244de9209e745
2018-09-18Provide better message when memfd_create fails with ENOSYSFabricio Voznika
Updates #100 PiperOrigin-RevId: 213414821 Change-Id: I90c2e6c18c54a6afcd7ad6f409f670aa31577d37
2018-09-17Remove memory usage static initFabricio Voznika
panic() during init() can be hard to debug. Updates #100 PiperOrigin-RevId: 213391932 Change-Id: Ic103f1981c5b48f1e12da3b42e696e84ffac02a9
2018-09-17Rename container in testFabricio Voznika
's' used to stand for sandbox, before container exited. PiperOrigin-RevId: 213390641 Change-Id: I7bda94a50398c46721baa92227e32a7a1d817412
2018-09-17Prevent TCP connect from picking bound portsTamir Duberstein
PiperOrigin-RevId: 213387851 Change-Id: Icc6850761bc11afd0525f34863acd77584155140
2018-09-17runsc: Enable waiting on exited processes.Kevin Krakauer
This makes `runsc wait` behave more like waitpid()/wait4() in that: - Once a process has run to completion, you can wait on it and get its exit code. - Processes not waited on will consume memory (like a zombie process) PiperOrigin-RevId: 213358916 Change-Id: I5b5eca41ce71eea68e447380df8c38361a4d1558
2018-09-17Allow kernel.(*Task).Block to accept an extract only channelIan Gudger
PiperOrigin-RevId: 213328293 Change-Id: I4164133e6f709ecdb89ffbb5f7df3324c273860a
2018-09-17Add empty .s file to allow `//go:linkname`Tamir Duberstein
This was previously broken in 212917409, resulting in "missing function body" compilation errors. PiperOrigin-RevId: 213323695 Change-Id: I32a95b76a1c73fd731f223062ec022318b979bd4
2018-09-17Implement packet forwarding to enable NATTamir Duberstein
PiperOrigin-RevId: 213323501 Change-Id: I0996ddbdcf097588745efe35481085d42dbaf446
2018-09-17Allow NULL data in mount(2)Michael Pratt
PiperOrigin-RevId: 213315267 Change-Id: I7562bcd81fb22e90aa9c7dd9eeb94803fcb8c5af
2018-09-17runsc: Fix stdin/out/err in multi-container mode.Kevin Krakauer
Stdin/out/err weren't being sent to the sentry. PiperOrigin-RevId: 213307171 Change-Id: Ie4b634a58b1b69aa934ce8597e5cc7a47a2bcda2
2018-09-14Avoid reuse of pending SignalInfo objectsnewmanwang
runApp.execute -> Task.SendSignal -> sendSignalLocked -> sendSignalTimerLocked -> pendingSignals.enqueue assumes that it owns the arch.SignalInfo returned from platform.Context.Switch. On the other hand, ptrace.context.Switch assumes that it owns the returned SignalInfo and can safely reuse it on the next call to Switch. The KVM platform always returns a unique SignalInfo. This becomes a problem when the returned signal is not immediately delivered, allowing a future signal in Switch to change the previous pending SignalInfo. This is noticeable in #38 when external SIGINTs are delivered from the PTY slave FD. Note that the ptrace stubs are in the same process group as the sentry, so they are eligible to receive the PTY signals. This should probably change, but is not the only possible cause of this bug. Updates #38 Original change by newmanwang <wcs1011@gmail.com>, updated by Michael Pratt <mpratt@google.com>. Change-Id: I5383840272309df70a29f67b25e8221f933622cd PiperOrigin-RevId: 213071072
2018-09-14Remove buffer.Prependable.UsedBytesTamir Duberstein
It is the same as buffer.Prependable.View. PiperOrigin-RevId: 213064166 Change-Id: Ib33b8a2c4da864209d9a0be0a1c113be10b520d3
2018-09-14Reuse readlink parameter, add sockaddr max.Michael Pratt
PiperOrigin-RevId: 213058623 Change-Id: I522598c655d633b9330990951ff1c54d1023ec29
2018-09-14Pass buffer.Prependable by valueTamir Duberstein
PiperOrigin-RevId: 213053370 Change-Id: I60ea89572b4fca53fd126c870fcbde74fcf52562
2018-09-14Make gVisor hard link check match Linux's.Nicolas Lacasse
Linux permits hard-linking if the target is owned by the user OR the target has Read+Write permission. PiperOrigin-RevId: 213024613 Change-Id: If642066317b568b99084edd33ee4e8822ec9cbb3
2018-09-14Fix interaction between rt_sigtimedwait and ignored signals.Jamie Liu
PiperOrigin-RevId: 213011782 Change-Id: I716c6ea3c586b0c6c5a892b6390d2d11478bc5af
2018-09-13platform/kvm: Get max vcpu number dynamically by ioctlChenggang
The old kernel version, such as 4.4, only support 255 vcpus. While gvisor is ran on these kernels, it could panic because the vcpu id and vcpu number beyond max_vcpus. Use ioctl(vmfd, _KVM_CHECK_EXTENSION, _KVM_CAP_MAX_VCPUS) to get max vcpus number dynamically. Change-Id: I50dd859a11b1c2cea854a8e27d4bf11a411aa45c PiperOrigin-RevId: 212929704
2018-09-13Plumb monotonic time to netstackIan Gudger
Netstack needs to be portable, so this seems to be preferable to using raw system calls. PiperOrigin-RevId: 212917409 Change-Id: I7b2073e7db4b4bf75300717ca23aea4c15be944c
2018-09-13runsc: Support container signal/wait.Lantao Liu
This CL: 1) Fix `runsc wait`, it now also works after the container exits; 2) Generate correct container state in Load; 2) Make sure `Destory` cleanup everything before successfully return. PiperOrigin-RevId: 212900107 Change-Id: Ie129cbb9d74f8151a18364f1fc0b2603eac4109a
2018-09-13Extend memory usage events to report mapped memory usage.Rahat Mahmood
PiperOrigin-RevId: 212887555 Change-Id: I3545383ce903cbe9f00d9b5288d9ef9a049b9f4f
2018-09-13Format struct itimerspecMichael Pratt
PiperOrigin-RevId: 212874745 Change-Id: I0c3e8e6a9e8976631cee03bf0b8891b336ddb8c8
2018-09-13initArgs must hold a reference on the Root if it is not nil.Nicolas Lacasse
The contract in ExecArgs says that a reference on ExecArgs.Root must be held for the lifetime of the struct, but the caller is free to drop the ref after that. As a result, proc.Exec must take an additional ref on Root when it constructs the CreateProcessArgs, since that holds a pointer to Root as well. That ref is dropped in CreateProcess. PiperOrigin-RevId: 212828348 Change-Id: I7f44a612f337ff51a02b873b8a845d3119408707
2018-09-12Always pass buffer.VectorisedView by valueTamir Duberstein
PiperOrigin-RevId: 212757571 Change-Id: I04200df9e45c21eb64951cd2802532fa84afcb1a
2018-09-12Add multicast supportTamir Duberstein
PiperOrigin-RevId: 212750821 Change-Id: I822fd63e48c684b45fd91f9ce057867b7eceb792
2018-09-12compressio: stop worker-pool reference / dependency loop.Zhaozhong Ni
PiperOrigin-RevId: 212732300 Change-Id: I9a0b9b7c28e7b7439d34656dd4f2f6114d173e22
2018-09-12runsc: Add exec flag that specifies where to save the sandbox-internal pid.Kevin Krakauer
This is different from the existing -pid-file flag, which saves a host pid. PiperOrigin-RevId: 212713968 Change-Id: I2c486de8dd5cfd9b923fb0970165ef7c5fc597f0
2018-09-12Remove getdents from filtersMichael Pratt
It was only used by whitelistfs, which was removed in bc81f3fe4a042a15343d2eab44da32d818ac1ade. PiperOrigin-RevId: 212666374 Change-Id: Ia35e6dc9d68c1a3b015d5b5f71ea3e68e46c5bed
2018-09-12Prevent UDP sockets from binding to bound portsTamir Duberstein
PiperOrigin-RevId: 212653818 Change-Id: Ib4e1d754d9cdddeaa428a066cb675e6ec44d91ad
2018-09-11Rollback of changelist 212483372Michael Pratt
PiperOrigin-RevId: 212557844 Change-Id: I414de848e75d57ecee2c05e851d05b607db4aa57
2018-09-11platform: Pass device fd into platform constructor.Nicolas Lacasse
We were previously openining the platform device (i.e. /dev/kvm) inside the platfrom constructor (i.e. kvm.New). This requires that we have RW access to the platform device when constructing the platform. However, now that the runsc sandbox process runs as user "nobody", it is not able to open the platform device. This CL changes the kvm constructor to take the platform device FD, rather than opening the device file itself. The device file is opened outside of the sandbox and passed to the sandbox process. PiperOrigin-RevId: 212505804 Change-Id: I427e1d9de5eb84c84f19d513356e1bb148a52910
2018-09-11Allow fstatat back in syscall filtersFabricio Voznika
PiperOrigin-RevId: 212483372 Change-Id: If95f32a8e41126cf3dc8bd6c8b2fb0fcfefedc6d
2018-09-10Map committed chunks concurrently in FileMem.LoadFrom.Jamie Liu
PiperOrigin-RevId: 212345401 Change-Id: Iac626ee87ba312df88ab1019ade6ecd62c04c75c
2018-09-10Allow '/dev/zero' to be mapped with unaligned lengthFabricio Voznika
PiperOrigin-RevId: 212321271 Change-Id: I79d71c2e6f4b8fcd3b9b923fe96c2256755f4c48
2018-09-10Simplify some code in VectorisedView#ToView.Bert Muthalaly
PiperOrigin-RevId: 212317717 Change-Id: Ic77449c53bf2f8be92c9f0a7a726c45bd35ec435
2018-09-10runsc: Chmod all mounted files to 777 inside chroot.Nicolas Lacasse
Inside the chroot, we run as user nobody, so all mounted files and directories must be accessible to all users. PiperOrigin-RevId: 212284805 Change-Id: I705e0dbbf15e01e04e0c7f378a99daffe6866807
2018-09-07Automated rollback of changelist 212059579Nicolas Lacasse
PiperOrigin-RevId: 212069131 Change-Id: I01476f957bbf29d4ee5a3c11d59d4f863ba9f2df
2018-09-07Update cleanup TODOMichael Pratt
PiperOrigin-RevId: 212068327 Change-Id: I3f360cdf7d6caa1c96fae68ae3a1caaf440f0cbe
2018-09-07Automated rollback of changelist 211992321Nicolas Lacasse
PiperOrigin-RevId: 212066419 Change-Id: Icded56e7e117bfd9b644e6541bddcd110460a9b8
2018-09-07runsc: Support multi-container exec.Nicolas Lacasse
We must use a context.Context with a Root Dirent that corresponds to the container's chroot. Previously we were using the root context, which does not have a chroot. Getting the correct context required refactoring some of the path-lookup code. We can't lookup the path without a context.Context, which requires kernel.CreateProcArgs, which we only get inside control.Execute. So we have to do the path lookup much later than we previously were. PiperOrigin-RevId: 212064734 Change-Id: I84a5cfadacb21fd9c3ab9c393f7e308a40b9b537
2018-09-07Disable test until we figure out what's brokenFabricio Voznika
PiperOrigin-RevId: 212059579 Change-Id: I052c2192d3483d7bd0fd2232ef2023a12da66446
2018-09-07Add 'Starting gVisor...' message to syslogFabricio Voznika
This allows applications to verify they are running with gVisor. It also helps debugging when running with a mix of container runtimes. Closes #54 PiperOrigin-RevId: 212059457 Change-Id: I51d9595ee742b58c1f83f3902ab2e2ecbd5cedec
2018-09-07Add additional sanity checks for walk.Adin Scannell
PiperOrigin-RevId: 212058684 Change-Id: I319709b9ffcfccb3231bac98df345d2a20eca24b
2018-09-07Only start signal forwarding after init process is createdFabricio Voznika
PiperOrigin-RevId: 212028121 Change-Id: If9c2c62f3be103e2bb556b8d154c169888e34369
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