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2019-07-02Remove map from fd_map, change to fd_table.Adin Scannell
This renames FDMap to FDTable and drops the kernel.FD type, which had an entire package to itself and didn't serve much use (it was freely cast between types, and served as more of an annoyance than providing any protection.) Based on BenchmarkFDLookupAndDecRef-12, we can expect 5-10 ns per lookup operation, and 10-15 ns per concurrent lookup operation of savings. This also fixes two tangential usage issues with the FDMap. Namely, non-atomic use of NewFDFrom and associated calls to Remove (that are both racy and fail to drop the reference on the underlying file.) PiperOrigin-RevId: 256285890
2019-07-01Use new location of python-hello image in tests.Nicolas Lacasse
PiperOrigin-RevId: 256062988
2019-06-28Add finalizer on AtomicRefCount to check for leaks.Ian Gudger
PiperOrigin-RevId: 255711454
2019-06-28Automated rollback of changelist 255263686Nicolas Lacasse
PiperOrigin-RevId: 255679453
2019-06-28runsc: allow openat for runsc-raceAndrei Vagin
I see that runsc-race is killed by SIGSYS, because openat isn't allowed by seccomp filters: 60052 openat(AT_FDCWD, "/proc/sys/vm/overcommit_memory", O_RDONLY|O_CLOEXEC <unfinished ...> 60052 <... openat resumed> ) = 257 60052 --- SIGSYS {si_signo=SIGSYS, si_code=SYS_SECCOMP, si_call_addr=0xfaacf1, si_syscall=__NR_openat, si_arch=AUDIT_ARCH_X86_64} --- PiperOrigin-RevId: 255640808
2019-06-27Fix various spelling issues in the documentationMichael Pratt
Addresses obvious typos, in the documentation only. COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/443 from Pixep:fix/documentation-spelling 4d0688164eafaf0b3010e5f4824b35d1e7176d65 PiperOrigin-RevId: 255477779
2019-06-27Cache directory entries in the overlayMichael Pratt
Currently, the overlay dirCache is only used for a single logical use of getdents. i.e., it is discard when the FD is closed or seeked back to the beginning. But the initial work of getting the directory contents can be quite expensive (particularly sorting large directories), so we should keep it as long as possible. This is very similar to the readdirCache in fs/gofer. Since the upper filesystem does not have to allow caching readdir entries, the new CacheReaddir MountSourceOperations method controls this behavior. This caching should be trivially movable to all Inodes if desired, though that adds an additional copy step for non-overlay Inodes. (Overlay Inodes already do the extra copy). PiperOrigin-RevId: 255477592
2019-06-26Preserve permissions when checking lowerFabricio Voznika
The code was wrongly assuming that only read access was required from the lower overlay when checking for permissions. This allowed non-writable files to be writable in the overlay. Fixes #316 PiperOrigin-RevId: 255263686
2019-06-26Always set SysProcAttr.Ctty to an FD in the child's FD table.Nicolas Lacasse
Go was going to change the behavior of SysProcAttr.Ctty such that it must be an FD in the *parent* FD table: https://go-review.googlesource.com/c/go/+/178919/ However, after some debate, it was decided that this change was too backwards-incompatible, and so it was reverted. https://github.com/golang/go/issues/29458 The behavior going forward is unchanged: the Ctty FD must be an FD in the *child* FD table. PiperOrigin-RevId: 255228476
2019-06-25Use different Ctty FDs based on the go version.Nicolas Lacasse
An upcoming change in Go 1.13 [1] changes the semantics of the SysProcAttr.Ctty field. Prior to the change, the FD must be an FD in the child process's FD table (aka "post-shuffle"). After the change, the FD must be an FD in the current process's FD table (aka "pre-shuffle"). To be compatible with both versions this CL introduces a new boolean "CttyFdIsPostShuffle" which indicates whether a pre- or post-shuffle FD should be provided. We use build tags to chose the correct one. 1: https://go-review.googlesource.com/c/go/+/178919/ PiperOrigin-RevId: 255015303
2019-06-24fsgopher: reopen files via /proc/self/fdAndrei Vagin
When we reopen file by path, we can't be sure that we will open exactly the same file. The file can be deleted and another one with the same name can be created. PiperOrigin-RevId: 254898594
2019-06-24Allow to change logging options using 'runsc debug'Fabricio Voznika
New options are: runsc debug --strace=off|all|function1,function2 runsc debug --log-level=warning|info|debug runsc debug --log-packets=true|false Updates #407 PiperOrigin-RevId: 254843128
2019-06-21Delete dangling comment line.Nicolas Lacasse
This was from an old comment, which was superseded by the existing comment which is correct. PiperOrigin-RevId: 254434535
2019-06-20Drop extra characterMichael Pratt
PiperOrigin-RevId: 254237530
2019-06-18Kill sandbox process when 'runsc do' exitsFabricio Voznika
PiperOrigin-RevId: 253882115
2019-06-18Add Container/Sandbox args struct for creationFabricio Voznika
There were 3 string arguments that could be easily misplaced and it makes it easier to add new arguments, especially for Container that has dozens of callers. PiperOrigin-RevId: 253872074
2019-06-18gvisor/kokoro: don't modify tests names in the BUILD fileAndrei Vagin
PiperOrigin-RevId: 253746380
2019-06-17gvisor/bazel: use python2 to build runsc-debianAndrei Vagin
$ bazel build runsc:runsc-debian File ".../bazel_tools/tools/build_defs/pkg/make_deb.py", line 311, in GetFlagValue: flagvalue = flagvalue.decode('utf-8') AttributeError: 'str' object has no attribute 'decode' make_deb.py is incompatible with Python3. https://github.com/bazelbuild/bazel/issues/8443 PiperOrigin-RevId: 253691923
2019-06-14Enable Receive Buffer Auto-Tuning for runsc.Bhasker Hariharan
Updates #230 PiperOrigin-RevId: 253225078
2019-06-13Plumb context through more layers of filesytem.Ian Gudger
All functions which allocate objects containing AtomicRefCounts will soon need a context. PiperOrigin-RevId: 253147709
2019-06-13Update canonical repository.Adin Scannell
This can be merged after: https://github.com/google/gvisor-website/pull/77 or https://github.com/google/gvisor-website/pull/78 PiperOrigin-RevId: 253132620
2019-06-13Set the HOME environment variable (fixes #293)Ian Lewis
runsc will now set the HOME environment variable as required by POSIX. The user's home directory is retrieved from the /etc/passwd file located on the container's file system during boot. PiperOrigin-RevId: 253120627
2019-06-12gvisor/runsc: apply seccomp filters before parsing a state fileAndrei Vagin
PiperOrigin-RevId: 252869983
2019-06-12Allow 'runsc do' to run without rootFabricio Voznika
'--rootless' flag lets a non-root user execute 'runsc do'. The drawback is that the sandbox and gofer processes will run as root inside a user namespace that is mapped to the caller's user, intead of nobody. And network is defaulted to '--network=host' inside the root network namespace. On the bright side, it's very convenient for testing: runsc --rootless do ls runsc --rootless do curl www.google.com PiperOrigin-RevId: 252840970
2019-06-11Add support to mount pod shared tmpfs mountsFabricio Voznika
Parse annotations containing 'gvisor.dev/spec/mount' that gives hints about how mounts are shared between containers inside a pod. This information can be used to better inform how to mount these volumes inside gVisor. For example, a volume that is shared between containers inside a pod can be bind mounted inside the sandbox, instead of being two independent mounts. For now, this information is used to allow the same tmpfs mounts to be shared between containers which wasn't possible before. PiperOrigin-RevId: 252704037
2019-06-11Use net.HardwareAddr for FDBasedLink.LinkAddressFabricio Voznika
It prints formatted to the log. PiperOrigin-RevId: 252699551
2019-06-11Fix broken pipe error building version fileFabricio Voznika
(11:34:09) ERROR: /tmpfs/src/github/repo/runsc/BUILD:82:1: Couldn't build file runsc/version.txt: Executing genrule //runsc:deb-version failed (Broken pipe): bash failed: error executing command PiperOrigin-RevId: 252691902
2019-06-10Add introspection for Linux/AMD64 syscallsIan Lewis
Adds simple introspection for syscall compatibility information to Linux/AMD64. Syscalls registered in the syscall table now have associated metadata like name, support level, notes, and URLs to relevant issues. Syscall information can be exported as a table, JSON, or CSV using the new 'runsc help syscalls' command. Users can use this info to debug and get info on the compatibility of the version of runsc they are running or to generate documentation. PiperOrigin-RevId: 252558304
2019-06-07Move //pkg/sentry/memutil to //pkg/memutil.Jamie Liu
PiperOrigin-RevId: 252124156
2019-06-06BUILD: Use runsc to generate versionAdin Scannell
This also ensures BUILD files are correctly formatted. PiperOrigin-RevId: 251990267
2019-06-06Add alsologtostderr optionFabricio Voznika
When set sends log messages to the error log: sudo ./runsc --logtostderr do ls I0531 17:59:58.105064 144564 x:0] *************************** I0531 17:59:58.105087 144564 x:0] Args: [runsc --logtostderr do ls] I0531 17:59:58.105112 144564 x:0] PID: 144564 I0531 17:59:58.105125 144564 x:0] UID: 0, GID: 0 [...] PiperOrigin-RevId: 251964377
2019-06-06Copy up parent when binding UDS on overlayfsFabricio Voznika
Overlayfs was expecting the parent to exist when bind(2) was called, which may not be the case. The fix is to copy the parent directory to the upper layer before binding the UDS. There is not good place to add tests for it. Syscall tests would be ideal, but it's hard to guarantee that the directory where the socket is created hasn't been touched before (and thus copied the parent to the upper layer). Added it to runsc integration tests for now. If it turns out we have lots of these kind of tests, we can consider moving them somewhere more appropriate. PiperOrigin-RevId: 251954156
2019-06-06Implement reclaim-driven MemoryFile eviction.Jamie Liu
PiperOrigin-RevId: 251950660
2019-06-06Send error message to docker/kubectl exec on failureFabricio Voznika
Containerd uses the last error message sent to the log to print as failure cause for create/exec. This required a few changes in the logging logic for runsc: - cmd.Errorf/Fatalf: now writes a message with 'error' level to containerd log, in addition to stderr and debug logs, like before. - log.Infof/Warningf/Fatalf: are not sent to containerd log anymore. They are mostly used for debugging and not useful to containerd. In most cases, --debug-log is enabled and this avoids the logs messages from being duplicated. - stderr is not used as default log destination anymore. Some commands assume stdio is for the container/process running inside the sandbox and it's better to never use it for logging. By default, logs are supressed now. PiperOrigin-RevId: 251881815
2019-06-06Add multi-fd support to fdbased endpoint.Bhasker Hariharan
This allows an fdbased endpoint to have multiple underlying fd's from which packets can be read and dispatched/written to. This should allow for higher throughput as well as better scalability of the network stack as number of connections increases. Updates #231 PiperOrigin-RevId: 251852825
2019-06-05Shutdown host sockets on internal shutdownMichael Pratt
This is required to make the shutdown visible to peers outside the sandbox. The readClosed / writeClosed fields were dropped, as they were preventing a shutdown socket from reading the remainder of queued bytes. The host syscalls will return the appropriate errors for shutdown. The control message tests have been split out of socket_unix.cc to make the (few) remaining tests accessible to testing inherited host UDS, which don't support sending control messages. Updates #273 PiperOrigin-RevId: 251763060
2019-06-03Refactor container FS setupFabricio Voznika
No change in functionaly. Added containerMounter object to keep state while the mounts are processed. This will help upcoming changes to share mounts per-pod. PiperOrigin-RevId: 251350096
2019-06-03Remove 'clearStatus' option from container.Wait*PID()Fabricio Voznika
clearStatus was added to allow detached execution to wait on the exec'd process and retrieve its exit status. However, it's not currently used. Both docker and gvisor-containerd-shim wait on the "shim" process and retrieve the exit status from there. We could change gvisor-containerd-shim to use waits, but it will end up also consuming a process for the wait, which is similar to having the shim process. Closes #234 PiperOrigin-RevId: 251349490
2019-06-03Remove spurious periodMichael Pratt
PiperOrigin-RevId: 251288885
2019-05-30Add support for collecting execution trace to runsc.Bhasker Hariharan
Updates #220 PiperOrigin-RevId: 250532302
2019-05-30runsc/do: don't specify the read-only flag for the root mountAndrei Vagin
The root mount is an overlay mount. PiperOrigin-RevId: 250429317
2019-05-30runsc/do: allow to run commands in a host network namespaceAndrei Vagin
PiperOrigin-RevId: 250329795
2019-05-30Update internal flag name and documentationFabricio Voznika
Updates #234 PiperOrigin-RevId: 250323553
2019-05-23runsc/do: do a proper cleanup if a command failed due to internal errorsAndrei Vagin
Fatalf calls os.Exit and a process exits without calling defer callbacks. Should we do this for other runsc commands? PiperOrigin-RevId: 249776310 Change-Id: If9d8b54d0ae37db443895906eb33bd9e9b600cc9
2019-05-23Set sticky bit to /tmpFabricio Voznika
This is generally done for '/tmp' to prevent accidental deletion of files. More details here: http://man7.org/linux/man-pages/man1/chmod.1.html#RESTRICTED_DELETION_FLAG_OR_STICKY_BIT PiperOrigin-RevId: 249633207 Change-Id: I444a5b406fdef664f5677b2f20f374972613a02b
2019-05-23Initial support for bind mountsFabricio Voznika
Separate MountSource from Mount. This is needed to allow mounts to be shared by multiple containers within the same pod. PiperOrigin-RevId: 249617810 Change-Id: Id2944feb7e4194951f355cbe6d4944ae3c02e468
2019-05-17Return EPERM for mknodMichael Pratt
This more directly matches what Linux does with unsupported nodes. PiperOrigin-RevId: 248780425 Change-Id: I17f3dd0b244f6dc4eb00e2e42344851b8367fbec
2019-05-16tiny fix: avoid panicing when OpenSpec failedLiu Hua
Signed-off-by: Liu Hua <sdu.liu@huawei.com> Change-Id: I11a4620394a10a7d92036b0341e0c21ad50bd122 PiperOrigin-RevId: 248621810
2019-05-15Cleanup around urpc file payload handlingFabricio Voznika
urpc always closes all files once the RPC function returns. PiperOrigin-RevId: 248406857 Change-Id: I400a8562452ec75c8e4bddc2154948567d572950
2019-05-15gvisor/runsc: use a veth link address instead of generating a new oneAndrei Vagin
PiperOrigin-RevId: 248367340 Change-Id: Id792afcfff9c9d2cfd62cae21048316267b4a924
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