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2018-10-23Track paths and provide a rename hook.Adin Scannell
This change also adds extensive testing to the p9 package via mocks. The sanity checks and type checks are moved from the gofer into the core package, where they can be more easily validated. PiperOrigin-RevId: 218296768 Change-Id: I4fc3c326e7bf1e0e140a454cbacbcc6fd617ab55
2018-10-20Add more unimplemented syscall eventsFabricio Voznika
Added events for *ctl syscalls that may have multiple different commands. For runsc, each syscall event is only logged once. For *ctl syscalls, use the cmd as identifier, not only the syscall number. PiperOrigin-RevId: 218015941 Change-Id: Ie3c19131ae36124861e9b492a7dbe1765d9e5e59
2018-10-19Use correct company name in copyright headerIan Gudger
PiperOrigin-RevId: 217951017 Change-Id: Ie08bf6987f98467d07457bcf35b5f1ff6e43c035
2018-10-18Resolve mount paths while setting up root fs mountFabricio Voznika
It's hard to resolve symlinks inside the sandbox because rootfs and mounts may be read-only, forcing us to create mount points inside lower layer of an overlay, **before** the volumes are mounted. Since the destination must already be resolved outside the sandbox when creating mounts, take this opportunity to rewrite the spec with paths resolved. "runsc boot" will use the "resolved" spec to load mounts. In addition, symlink traversals were disabled while mounting containers inside the sandbox. It haven't been able to write a good test for it. So I'm relying on manual tests for now. PiperOrigin-RevId: 217749904 Change-Id: I7ac434d5befd230db1488446cda03300cc0751a9
2018-10-17Close the gofer socket gracefully in boot:boot_test.Nicolas Lacasse
We were closing the FD directly. If the test then created a new socket pair with the same FD, in-flight RPCs would get directed to the new socket and break the test. Instead, we should use unet.Socket.Close(), which allows any in-flight RPCs to finish. PiperOrigin-RevId: 217608491 Change-Id: I8c5a76638899ba30f33ca976e6fac967fa0aadbf
2018-10-17runsc: Support job control signals for the root container.Nicolas Lacasse
Now containers run with "docker run -it" support control characters like ^C and ^Z. This required refactoring our signal handling a bit. Signals delivered to the "runsc boot" process are turned into loader.Signal calls with the appropriate delivery mode. Previously they were always sent directly to PID 1. PiperOrigin-RevId: 217566770 Change-Id: I5b7220d9a0f2b591a56335479454a200c6de8732
2018-10-17Remove incorrect TODO.Kevin Krakauer
PiperOrigin-RevId: 217548429 Change-Id: Ie640c881fdc4fc70af58c8ca834df1ac531e519a
2018-10-17runsc: Add --pid flag to runsc kill.Kevin Krakauer
--pid allows specific processes to be signalled rather than the container root process or all processes in the container. containerd needs to SIGKILL exec'd processes that timeout and check whether processes are still alive. PiperOrigin-RevId: 217547636 Change-Id: I2058ebb548b51c8eb748f5884fb88bad0b532e45
2018-10-11Fix reference leak in tests.Nicolas Lacasse
PiperOrigin-RevId: 216780438 Change-Id: Ide637fe36f8d2a61fea9e5b16d1b3401f2540416
2018-10-11Make debug log file name configurableFabricio Voznika
This is a breaking change if you're using --debug-log-dir. The fix is to replace it with --debug-log and add a '/' at the end: --debug-log-dir=/tmp/runsc ==> --debug-log=/tmp/runsc/ PiperOrigin-RevId: 216761212 Change-Id: I244270a0a522298c48115719fa08dad55e34ade1
2018-10-11Add bare bones unsupported syscall loggingFabricio Voznika
This change introduces a new flags to create/run called --user-log. Logs to this files are visible to users and are meant to help debugging problems with their images and containers. For now only unsupported syscalls are sent to this log, and only minimum support was added. We can build more infrastructure around it as needed. PiperOrigin-RevId: 216735977 Change-Id: I54427ca194604991c407d49943ab3680470de2d0
2018-10-10Removes irrelevant TODO.Kevin Krakauer
PiperOrigin-RevId: 216616873 Change-Id: I4d974ab968058eadd01542081e18a987ef08f50a
2018-10-10Support for older Linux kernels without getrandomJonathan Giannuzzi
Change-Id: I1fb9f5b47a264a7617912f6f56f995f3c4c5e578 PiperOrigin-RevId: 216591484
2018-10-10Enforce message size limits and avoid host calls with too many iovecsMichael Pratt
Currently, in the face of FileMem fragmentation and a large sendmsg or recvmsg call, host sockets may pass > 1024 iovecs to the host, which will immediately cause the host to return EMSGSIZE. When we detect this case, use a single intermediate buffer to pass to the kernel, copying to/from the src/dst buffer. To avoid creating unbounded intermediate buffers, enforce message size checks and truncation w.r.t. the send buffer size. The same functionality is added to netstack unix sockets for feature parity. PiperOrigin-RevId: 216590198 Change-Id: I719a32e71c7b1098d5097f35e6daf7dd5190eff7
2018-10-10Add sandbox to cgroupFabricio Voznika
Sandbox creation uses the limits and reservations configured in the OCI spec and set cgroup options accordinly. Then it puts both the sandbox and gofer processes inside the cgroup. It also allows the cgroup to be pre-configured by the caller. If the cgroup already exists, sandbox and gofer processes will join the cgroup but it will not modify the cgroup with spec limits. PiperOrigin-RevId: 216538209 Change-Id: If2c65ffedf55820baab743a0edcfb091b89c1019
2018-10-09Add new netstack metrics to the sentryIan Gudger
PiperOrigin-RevId: 216431260 Change-Id: Ia6e5c8d506940148d10ff2884cf4440f470e5820
2018-10-08Job control signals must be sent to all processes in the FG process group.Nicolas Lacasse
We were previously only sending to the originator of the process group. Integration test was changed to test this behavior. It fails without the corresponding code change. PiperOrigin-RevId: 216297263 Change-Id: I7e41cfd6bdd067f4b9dc215e28f555fb5088916f
2018-10-08Uncapitalize errorMichael Pratt
PiperOrigin-RevId: 216281263 Change-Id: Ie0c189e7f5934b77c6302336723bc1181fd2866c
2018-10-03runsc: Pass root container's stdio via FD.Nicolas Lacasse
We were previously using the sandbox process's stdio as the root container's stdio. This makes it difficult/impossible to distinguish output application output from sandbox output, such as panics, which are always written to stderr. Also close the console socket when we are done with it. PiperOrigin-RevId: 215585180 Change-Id: I980b8c69bd61a8b8e0a496fd7bc90a06446764e0
2018-10-03Add TIOCINQ to allowed seccomp when hostinet is usedFabricio Voznika
PiperOrigin-RevId: 215574070 Change-Id: Ib36e804adebaf756adb9cbc2752be9789691530b
2018-10-01runsc: Support job control signals in "exec -it".Nicolas Lacasse
Terminal support in runsc relies on host tty file descriptors that are imported into the sandbox. Application tty ioctls are sent directly to the host fd. However, those host tty ioctls are associated in the host kernel with a host process (in this case runsc), and the host kernel intercepts job control characters like ^C and send signals to the host process. Thus, typing ^C into a "runsc exec" shell will send a SIGINT to the runsc process. This change makes "runsc exec" handle all signals, and forward them into the sandbox via the "ContainerSignal" urpc method. Since the "runsc exec" is associated with a particular container process in the sandbox, the signal must be associated with the same container process. One big difficulty is that the signal should not necessarily be sent to the sandbox process started by "exec", but instead must be sent to the foreground process group for the tty. For example, we may exec "bash", and from bash call "sleep 100". A ^C at this point should SIGINT sleep, not bash. To handle this, tty files inside the sandbox must keep track of their foreground process group, which is set/get via ioctls. When an incoming ContainerSignal urpc comes in, we look up the foreground process group via the tty file. Unfortunately, this means we have to expose and cache the tty file in the Loader. Note that "runsc exec" now handles signals properly, but "runs run" does not. That will come in a later CL, as this one is complex enough already. Example: root@:/usr/local/apache2# sleep 100 ^C root@:/usr/local/apache2# sleep 100 ^Z [1]+ Stopped sleep 100 root@:/usr/local/apache2# fg sleep 100 ^C root@:/usr/local/apache2# PiperOrigin-RevId: 215334554 Change-Id: I53cdce39653027908510a5ba8d08c49f9cf24f39
2018-10-01Make multi-container the default mode for runscFabricio Voznika
And remove multicontainer option. PiperOrigin-RevId: 215236981 Change-Id: I9fd1d963d987e421e63d5817f91a25c819ced6cb
2018-09-28Make runsc kill and delete more conformant to the "spec"Fabricio Voznika
PiperOrigin-RevId: 214976251 Change-Id: I631348c3886f41f63d0e77e7c4f21b3ede2ab521
2018-09-28Change tcpip.Route.Mask to tcpip.AddressMask.Googler
PiperOrigin-RevId: 214975659 Change-Id: I7bd31a2c54f03ff52203109da312e4206701c44c
2018-09-27Merge Loader.containerRootTGs and execProcess into a single mapFabricio Voznika
It's easier to manage a single map with processes that we're interested to track. This will make the next change to clean up the map on destroy easier. PiperOrigin-RevId: 214894210 Change-Id: I099247323a0487cd0767120df47ba786fac0926d
2018-09-27Forward ioctl(TCSETSF) calls on host ttys to the host kernel.Nicolas Lacasse
We already forward TCSETS and TCSETSW. TCSETSF is roughly equivalent but discards pending input. The filters were relaxed to allow host ioctls with TCSETSF argument. This fixes programs like "passwd" that prevent user input from being displayed on the terminal. Before: root@b8a0240fc836:/# passwd Enter new UNIX password: 123 Retype new UNIX password: 123 passwd: password updated successfully After: root@ae6f5dabe402:/# passwd Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully PiperOrigin-RevId: 214869788 Change-Id: I31b4d1373c1388f7b51d0f2f45ce40aa8e8b0b58
2018-09-27Implement 'runsc kill --all'Fabricio Voznika
In order to implement kill --all correctly, the Sentry needs to track all tasks that belong to a given container. This change introduces ContainerID to the task, that gets inherited by all children. 'kill --all' then iterates over all tasks comparing the ContainerID field to find all processes that need to be signalled. PiperOrigin-RevId: 214841768 Change-Id: I693b2374be8692d88cc441ef13a0ae34abf73ac6
2018-09-27Refactor 'runsc boot' to take container ID as argumentFabricio Voznika
This makes the flow slightly simpler (no need to call Loader.SetRootContainer). And this is required change to tag tasks with container ID inside the Sentry. PiperOrigin-RevId: 214795210 Change-Id: I6ff4af12e73bb07157f7058bb15fd5bb88760884
2018-09-24runsc: All non-root bind mounts should be shared.Nicolas Lacasse
This CL changes the semantics of the "--file-access" flag so that it only affects the root filesystem. The default remains "exclusive" which is the common use case, as neither Docker nor K8s supports sharing the root. Keeping the root fs as "exclusive" means that the fs-intensive work done during application startup will mostly be cacheable, and thus faster. Non-root bind mounts will always be shared. This CL also removes some redundant FSAccessType validations. We validate this flag in main(), so we can assume it is valid afterwards. PiperOrigin-RevId: 214359936 Change-Id: I7e75d7bf52dbd7fa834d0aacd4034868314f3b51
2018-09-20runsc: allow `runsc wait` on a container for multiple times.Lantao Liu
PiperOrigin-RevId: 213908919 Change-Id: I74eff99a5360bb03511b946f4cb5658bb5fc40c7
2018-09-20Wait for all async fs operations to complete before returning from Destroy.Nicolas Lacasse
Destroy flushes dirent references, which triggers many async close operations. We must wait for those to finish before returning from Destroy, otherwise we may kill the gofer, causing a cascade of failing RPCs and leading to an inconsistent FS state. PiperOrigin-RevId: 213884637 Change-Id: Id054b47fc0f97adc5e596d747c08d3b97a1d1f71
2018-09-19runsc: Fix stdin/stdout/stderr in multi-container mode.Kevin Krakauer
The issue with the previous change was that the stdin/stdout/stderr passed to the sentry were dup'd by host.ImportFile. This left a dangling FD that by never closing caused containerd to timeout waiting on container stop. PiperOrigin-RevId: 213753032 Change-Id: Ia5e4c0565c42c8610d3b59f65599a5643b0901e4
2018-09-19Add container.Destroy urpc method.Nicolas Lacasse
This method will: 1. Stop the container process if it is still running. 2. Unmount all sanadbox-internal mounts for the container. 3. Delete the contaner root directory inside the sandbox. Destroy is idempotent, and safe to call concurrantly. This fixes a bug where after stopping a container, we cannot unmount the container root directory on the host. This bug occured because the sandbox dirent cache was holding a dirent with a host fd corresponding to a file inside the container root on the host. The dirent cache did not know that the container had exited, and kept the FD open, preventing us from unmounting on the host. Now that we unmount (and flush) all container mounts inside the sandbox, any host FDs donated by the gofer will be closed, and we can unmount the container root on the host. PiperOrigin-RevId: 213737693 Change-Id: I28c0ff4cd19a08014cdd72fec5154497e92aacc9
2018-09-19Fix sandbox and gofer capabilitiesFabricio Voznika
Capabilities.Set() adds capabilities, but doesn't remove existing ones that might have been loaded. Fixed the code and added tests. PiperOrigin-RevId: 213726369 Change-Id: Id7fa6fce53abf26c29b13b9157bb4c6616986fba
2018-09-19runsc: Don't create __runsc_containers__ unless we are in multi-container mode.Nicolas Lacasse
PiperOrigin-RevId: 213715511 Change-Id: I3e41b583c6138edbdeba036dfb9df4864134fc12
2018-09-19Add docker command line args support for --cpuset-cpus and --cpusLingfu
`docker run --cpuset-cpus=/--cpus=` will generate cpu resource info in config.json (runtime spec file). When nginx worker_connections is configured as auto, the worker is generated according to the number of CPUs. If the cgroup is already set on the host, but it is not displayed correctly in the sandbox, performance may be degraded. This patch can get cpus info from spec file and apply to sentry on bootup, so the /proc/cpuinfo can show the correct cpu numbers. `lscpu` and other commands rely on `/sys/devices/system/cpu/online` are also affected by this patch. e.g. --cpuset-cpus=2,3 -> cpu number:2 --cpuset-cpus=4-7 -> cpu number:4 --cpus=2.8 -> cpu number:3 --cpus=0.5 -> cpu number:1 Change-Id: Ideb22e125758d4322a12be7c51795f8018e3d316 PiperOrigin-RevId: 213685199
2018-09-18Automated rollback of changelist 213307171Kevin Krakauer
PiperOrigin-RevId: 213504354 Change-Id: Iadd42f0ca4b7e7a9eae780bee9900c7233fb4f3f
2018-09-17Remove memory usage static initFabricio Voznika
panic() during init() can be hard to debug. Updates #100 PiperOrigin-RevId: 213391932 Change-Id: Ic103f1981c5b48f1e12da3b42e696e84ffac02a9
2018-09-17runsc: 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
2018-09-17runsc: 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
2018-09-13runsc: 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
2018-09-12runsc: 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
2018-09-11Rollback 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
2018-09-07runsc: 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
2018-09-07Only start signal forwarding after init process is createdFabricio Voznika
PiperOrigin-RevId: 212028121 Change-Id: If9c2c62f3be103e2bb556b8d154c169888e34369
2018-09-07Remove '--file-access=direct' optionFabricio Voznika
It was used before gofer was implemented and it's not supported anymore. BREAKING CHANGE: proxy-shared and proxy-exclusive options are now: shared and exclusive. PiperOrigin-RevId: 212017643 Change-Id: If029d4073fe60583e5ca25f98abb2953de0d78fd
2018-09-07Use root abstract socket namespace for execFabricio Voznika
PiperOrigin-RevId: 211999211 Change-Id: I5968dd1a8313d3e49bb6e6614e130107495de41d
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