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2020-10-23Merge release-20201019.0-36-gdad08229b (automated)gVisor bot
2020-10-23Do not hold NIC local address in neighbor entriesGhanan Gowripalan
Previously, the NIC local address used when completing link resolution was held in the neighbor entry. A neighbor is not identified by any NIC local address so remove it. PiperOrigin-RevId: 338699695
2020-10-23Merge release-20201019.0-35-g5d909dd49 (automated)gVisor bot
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
2020-10-23Merge release-20201019.0-34-g9ca66ec59 (automated)gVisor bot
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
2020-10-23Merge release-20201019.0-33-g293877cf6 (automated)gVisor bot
2020-10-22Load spec during "runsc start" to process flag overridesFabricio Voznika
Subcontainers are only configured when the container starts, however because start doesn't load the spec, flag annotations that may override flags were not getting applied to the configuration. Updates #3494 PiperOrigin-RevId: 338610953
2020-10-23Merge release-20201019.0-32-gcc772f3d5 (automated)gVisor bot
2020-10-22Add a platform portability blog postIan Lewis
Also fixes the docker_image bazel rule, and website-server make target. Fixes #3273 PiperOrigin-RevId: 338606668
2020-10-23Merge release-20201019.0-31-gc1a6ba06a (automated)gVisor bot
2020-10-22Pass NetworkInterface to LinkAddressRequestGhanan Gowripalan
Previously a link endpoint was passed to stack.LinkAddressResolver.LinkAddressRequest. With this change, implementations that want a route for the link address request may find one through the stack. Other implementations that want to send a packet without a route may continue to do so using the network interface directly. Test: - arp_test.TestLinkAddressRequest - ipv6.TestLinkAddressRequest PiperOrigin-RevId: 338577474
2020-10-22Merge release-20201019.0-30-gc188daf88 (automated)gVisor bot
2020-10-22[bazel] Reduce number of jobs to 100.Ayush Ranjan
PiperOrigin-RevId: 338517024
2020-10-22Merge release-20201019.0-29-g58a3c2d44 (automated)gVisor bot
2020-10-21Add underflow check when calculating the MTUArthur Sfez
Also enforce the minimum MTU for IPv4 and IPv6, and discard packets if the minimum is not met. PiperOrigin-RevId: 338404225
2020-10-22Merge release-20201019.0-28-g4e389c785 (automated)gVisor bot
2020-10-21Check for nil in kernel.FSContext functions.Dean Deng
Reported-by: syzbot+c0e175d2b10708314eb3@syzkaller.appspotmail.com PiperOrigin-RevId: 338386575
2020-10-22Merge release-20201019.0-27-g1a5eb49a4 (automated)gVisor bot
2020-10-21Merge pull request #3957 from workato:auto-cgroupgVisor bot
PiperOrigin-RevId: 338372736
2020-10-21Merge release-20201019.0-22-g1b2097f84 (automated)gVisor bot
2020-10-21Merge pull request #4535 from lubinszARM:pr_kvm_exec_binary_1gVisor bot
PiperOrigin-RevId: 338321125
2020-10-21Merge release-20201019.0-20-gb6a0c91aa (automated)gVisor bot
2020-10-20test/runtime: set the NOFILE soft rlimit to 32KAndrei Vagin
The python:test_subprocess enumerates all possible file descriptors and fails by timeout if the limit is too high. There is a know thing about docker that it sets this limit to 1M by default, but on native linux, this limit will be between 1K to 32K. PiperOrigin-RevId: 338197239
2020-10-20Do not even try forcing cgroups in testsKonstantin Baranov
2020-10-21Merge release-20201019.0-19-g7dc108b41 (automated)gVisor bot
2020-10-20Fix errors when the tagging GitHub releasesTing-Yu Wang
When the commit description contains "commit ", it will be wrongly identified as commit hash. This commit changes to take only lines begins with "commit " as a fix, since the description is always indented by `git log`. Copybara uses merge commit for external contributors, this causes that not all commits contain a Piper ID. Adding `--first-parent` to `git log` so that it only lists commits that contain a Piper ID. PiperOrigin-RevId: 338183812
2020-10-21Merge release-20201005.0-115-g16ba35031 (automated)gVisor bot
2020-10-20Fix nogo test in //pkg/tcpip/...Ting-Yu Wang
PiperOrigin-RevId: 338168977
2020-10-20Merge release-20201005.0-114-ge36a2b793 (automated)gVisor bot
2020-10-20[runtime tests] Update exclude files.Ayush Ranjan
bhaskerh@ fixed a bunch of the EADDRINUSE flakes in #3662 so we should unexclude them. I have also tested other flaky tests on this list and removed those that do not flake anymore. PiperOrigin-RevId: 338158545
2020-10-20Merge release-20201005.0-113-g2bfdbfd1f (automated)gVisor bot
2020-10-20Fix locking in AddressableEndpointStateGhanan Gowripalan
PiperOrigin-RevId: 338156438
2020-10-20Merge release-20201005.0-112-g4da10f873 (automated)gVisor bot
2020-10-20Fix nogo tests.Ting-Yu Wang
//pkg/tcpip/stack:stack_x_test_nogo //pkg/tcpip/transport/raw:raw_nogo PiperOrigin-RevId: 338153265
2020-10-20Merge release-20201005.0-111-gd45d57f49 (automated)gVisor bot
2020-10-20Merge pull request #4524 from lemin9538:lemin_arm64gVisor bot
PiperOrigin-RevId: 338126491
2020-10-20Merge release-20201005.0-109-gc21d8375d (automated)gVisor bot
2020-10-20Add /dev to mandatory mounts testFabricio Voznika
PiperOrigin-RevId: 338072845
2020-10-20Merge release-20201005.0-108-g34a6e9576 (automated)gVisor bot
2020-10-19loader/elf: validate file offsetAndrei Vagin
Reported-by: syzbot+7406eef8247cb5a20855@syzkaller.appspotmail.com PiperOrigin-RevId: 337974474
2020-10-20Merge release-20201005.0-107-gdcc1b71f1 (automated)gVisor bot
2020-10-19Fix reference counting on kcov mappings.Dean Deng
Reported-by: syzbot+078580ce5dd6d607fcd8@syzkaller.appspotmail.com Reported-by: syzbot+2096681f6891e7bf8aed@syzkaller.appspotmail.com PiperOrigin-RevId: 337973519
2020-10-20Merge release-20201005.0-106-g2a4ec9cf7 (automated)gVisor bot
2020-10-19Merge pull request #4510 from btw616:fix/issue-4509gVisor bot
PiperOrigin-RevId: 337971497
2020-10-20Merge release-20201005.0-104-gcd86bd493 (automated)gVisor bot
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
2020-10-20Merge release-20201005.0-103-g8f29b8d25 (automated)gVisor bot
2020-10-19Remove now unused remote3 configurations.Adin Scannell
PiperOrigin-RevId: 337968219
2020-10-19Merge release-20201005.0-102-g54e989ec3 (automated)gVisor bot
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