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2021-04-06Do not perform MLD for certain multicast scopesGhanan Gowripalan
...as per RFC 2710 section 5 page 10. Test: ipv6_test.TestMLDSkipProtocol PiperOrigin-RevId: 367031126
2021-04-05Update gofer dentry permissions only when needed.Ayush Ranjan
Without this change, we ask the gofer server to update the permissions whenever the UID, GID or size is updated via SetStat. Consequently, we don not generate inotify events when the permissions actually change due to SGID bit getting cleared. With this change, we will update the permissions only when needed and generate inotify events. PiperOrigin-RevId: 366946842
2021-04-05Fix listen backlog handling to be in parity with LinuxMithun Iyer
- Change the accept queue full condition for a listening endpoint to only honor completed (and delivered) connections. - Use syncookies if the number of incomplete connections is beyond listen backlog. This also cleans up the SynThreshold option code as that is no longer used with this change. - Added a new stack option to unconditionally generate syncookies. Similar to sysctl -w net.ipv4.tcp_syncookies=2 on Linux. - Enable keeping of incomplete connections beyond listen backlog. - Drop incoming SYNs only if the accept queue is filled up. - Drop incoming ACKs that complete handshakes when accept queue is full - Enable the stack to accept one more connection than programmed by listen backlog. - Handle backlog argument being zero, negative for listen, as Linux. - Add syscall and packetimpact tests to reflect the changes above. - Remove TCPConnectBacklog test which is polling for completed connections on the client side which is not reflective of whether the accept queue is filled up by the test. The modified syscall test in this CL addresses testing of connecting sockets. Fixes #3153 PiperOrigin-RevId: 366935921
2021-04-05Report task CPU usage through the cpuacct cgroup controller.Rahat Mahmood
PiperOrigin-RevId: 366923274
2021-04-05Allow default control values to be set for cgroupfs.Rahat Mahmood
PiperOrigin-RevId: 366891806
2021-04-05Allow user mount for verity fsChong Cai
Allow user mounting a verity fs on an existing mount by specifying mount flags root_hash and lower_path. PiperOrigin-RevId: 366843846
2021-04-05Fail tests when container returns non-zero statusFabricio Voznika
PiperOrigin-RevId: 366839955
2021-04-02Implement cgroupfs.Rahat Mahmood
A skeleton implementation of cgroupfs. It supports trivial cpu and memory controllers with no support for hierarchies. PiperOrigin-RevId: 366561126
2021-04-02Internal change.gVisor bot
PiperOrigin-RevId: 366462448
2021-04-01Internal changesBhasker Hariharan
PiperOrigin-RevId: 366344805
2021-03-29[syserror] Split usermem packageZach Koopmans
Split usermem package to help remove syserror dependency in go_marshal. New hostarch package contains code not dependent on syserror. PiperOrigin-RevId: 365651233
2021-03-29Merge pull request #5728 from zhlhahaha:2091gVisor bot
PiperOrigin-RevId: 365613394
2021-03-29[perf] Reduce contention in ptrace.threadPool.lookupOrCreate().Ayush Ranjan
lookupOrCreate is called from subprocess.switchToApp() and subprocess.syscall(). lookupOrCreate() looks for a thread already created for the current TID. If a thread exists (common case), it returns immediately. Otherwise it creates a new one. This change switches to using a sync.RWMutex. The initial thread existence lookup is now done only with the read lock. So multiple successful lookups can occur concurrently. Only when a new thread is created will it acquire the lock for writing and update the map (which is not the common case). Discovered in mutex profiles from the various ptrace benchmarks. Example: https://gvisor.dev/profile/gvisor-buildkite/fd14bfad-b30f-44dc-859b-80ebac50beb4/843827db-da50-4dc9-a2ea-ecf734dde2d5/tmp/profile/ptrace/BenchmarkFio/operation.write/blockSize.4K/filesystem.tmpfs/benchmarks/fio/mutex.pprof/flamegraph PiperOrigin-RevId: 365612094
2021-03-25Use seqfile.SeqHandles correctly in VFS1 /proc/net/.Jamie Liu
Before this change: ``` $ docker run --runtime=runsc --rm -it -v ~/tmp:/hosttmp ubuntu:focal /hosttmp/issue5732 --bytes1=128 --bytes2=1024 #1: read(128) = 128 #2: read(1024) = EOF $ docker run --runtime=runsc-vfs2 --rm -it -v ~/tmp:/hosttmp ubuntu:focal /hosttmp/issue5732 --bytes1=128 --bytes2=1024 #1: read(128) = 128 #2: read(1024) = 256 ``` After this change: ``` $ docker run --runtime=runsc --rm -it -v ~/tmp:/hosttmp ubuntu:focal /hosttmp/issue5732 --bytes1=128 --bytes2=1024 #1: read(128) = 128 #2: read(1024) = 256 $ docker run --runtime=runsc-vfs2 --rm -it -v ~/tmp:/hosttmp ubuntu:focal /hosttmp/issue5732 --bytes1=128 --bytes2=1024 #1: read(128) = 128 #2: read(1024) = 256 ``` Fixes #5732 PiperOrigin-RevId: 365178386
2021-03-25Lock TaskSet mutex for writing in ptraceClone().Jamie Liu
This is necessary since ptraceClone() mutates tracer.ptraceTracees. PiperOrigin-RevId: 365152396
2021-03-25Fix comments errorHoward Zhang
Signed-off-by: Howard Zhang <howard.zhang@arm.com>
2021-03-25Fix nogo test errorHoward Zhang
Signed-off-by: Howard Zhang <howard.zhang@arm.com>
2021-03-24Add POLLRDNORM/POLLWRNORM support.Bhasker Hariharan
On Linux these are meant to be equivalent to POLLIN/POLLOUT. Rather than hack these on in sys_poll etc it felt cleaner to just cleanup the call sites to notify for both events. This is what linux does as well. Fixes #5544 PiperOrigin-RevId: 364859977
2021-03-24Fix data race in fdbased when accessing fanoutID.Bhasker Hariharan
PiperOrigin-RevId: 364859173
2021-03-24Unexpose immutable fields in stack.RouteNick Brown
This change sets the inner `routeInfo` struct to be a named private member and replaces direct access with access through getters. Note that direct access to the fields of `routeInfo` is still possible through the `RouteInfo` struct. Fixes #4902 PiperOrigin-RevId: 364822872
2021-03-23Merge pull request #5677 from avagin:kvm-mmiogVisor bot
PiperOrigin-RevId: 364728696
2021-03-23Move the code that manages floating-point state to a separate packageAndrei Vagin
This change is inspired by Adin's cl/355256448. PiperOrigin-RevId: 364695931
2021-03-23setgid directory support in goferfsKevin Krakauer
Also adds support for clearing the setuid bit when appropriate (writing, truncating, changing size, changing UID, or changing GID). VFS2 only. PiperOrigin-RevId: 364661835
2021-03-23Use constant (TestInitialSequenceNumber) instead of integer (789) in tests.Nayana Bidari
PiperOrigin-RevId: 364596526
2021-03-23Explicitly allow martian loopback packetsGhanan Gowripalan
...instead of opting out of them. Loopback traffic should be stack-local but gVisor has some clients that depend on the ability to receive loopback traffic that originated from outside of the stack. Because of this, we guard this change behind IP protocol options. A previous change provided the facility to deny these martian loopback packets but this change requires client to opt-in to accepting martian loopback packets as accepting martian loopback packets are not meant to be accepted, as per RFC 1122 section 3.2.1.3.g: (g) { 127, <any> } Internal host loopback address. Addresses of this form MUST NOT appear outside a host. PiperOrigin-RevId: 364581174
2021-03-22Fix logs for packetimpact tests cleanupZeling Feng
- Don't cleanup containers in Network.Cleanup, otherwise containers will be killed and removed several times. - Don't set AutoRemove for containers. This will prevent the confusing 'removal already in progress' messages. Fixes #3795 PiperOrigin-RevId: 364404414
2021-03-22Return tcpip.Error from (*Stack).GetMainNICAddressGhanan Gowripalan
PiperOrigin-RevId: 364381970
2021-03-22Avoid calling sync on each write in writethrough mode.Nicolas Lacasse
PiperOrigin-RevId: 364370595
2021-03-18Translate syserror when validating partial IO errorsFabricio Voznika
syserror allows packages to register translators for errors. These translators should be called prior to checking if the error is valid, otherwise it may not account for possible errors that can be returned from different packages, e.g. safecopy.BusError => syserror.EFAULT. Second attempt, it passes tests now :-) PiperOrigin-RevId: 363714508
2021-03-17Do not use martian loopback packets in testsGhanan Gowripalan
Transport demuxer and UDP tests should not use a loopback address as the source address for packets injected into the stack as martian loopback packets will be dropped in a later change. PiperOrigin-RevId: 363479681
2021-03-17Drop loopback traffic from outside of the stackGhanan Gowripalan
Loopback traffic should be stack-local but gVisor has some clients that depend on the ability to receive loopback traffic that originated from outside of the stack. Because of this, we guard this change behind IP protocol options. Test: integration_test.TestExternalLoopbackTraffic PiperOrigin-RevId: 363461242
2021-03-16kvm: prefault a floating point state before restoring itAndrei Vagin
If physical pages of a memory region are not mapped yet, the kernel will trigger KVM_EXIT_MMIO and we will map physical pages in bluepillHandler(). An instruction that triggered a fault will not be re-executed, it will be emulated in the kernel, but it can't emulate complex instructions like xsave, xrstor. We can touch the memory with simple instructions to workaround this problem.
2021-03-16Fix tcp_fin_retransmission_netstack_testZeling Feng
Netstack does not check ACK number for FIN-ACK packets and goes into TIMEWAIT unconditionally. Fixing the state machine will give us back the retransmission of FIN. PiperOrigin-RevId: 363301883
2021-03-16Fix a race with synRcvdCount and acceptMithun Iyer
There is a race in handling new incoming connections on a listening endpoint that causes the endpoint to reply to more incoming SYNs than what is permitted by the listen backlog. The race occurs when there is a successful passive connection handshake and the synRcvdCount counter is decremented, followed by the endpoint delivered to the accept queue. In the window of time between synRcvdCount decrementing and the endpoint being enqueued for accept, new incoming SYNs can be handled without honoring the listen backlog value, as the backlog could be perceived not full. Fixes #5637 PiperOrigin-RevId: 363279372
2021-03-16setgid directory support in overlayfsKevin Krakauer
PiperOrigin-RevId: 363276495
2021-03-16Unexport methods on NDPOptionGhanan Gowripalan
They are not used outside of the header package. PiperOrigin-RevId: 363237708
2021-03-16Detect looped-back NDP DAD messagesGhanan Gowripalan
...as per RFC 7527. If a looped-back DAD message is received, do not fail DAD since our own DAD message does not indicate that a neighbor has the address assigned. Test: ndp_test.TestDADResolveLoopback PiperOrigin-RevId: 363224288
2021-03-16Do not call into Stack from LinkAddressRequestGhanan Gowripalan
Calling into the stack from LinkAddressRequest is not needed as we already have a reference to the network endpoint (IPv6) or network interface (IPv4/ARP). PiperOrigin-RevId: 363213973
2021-03-15Turn sys_thread constants into variables.Etienne Perot
PiperOrigin-RevId: 363092268
2021-03-15Move `MaxIovs` back to a variable in `iovec.go`.Etienne Perot
PiperOrigin-RevId: 363091954
2021-03-15Make netstack (//pkg/tcpip) buildable for 32 bitKevin Krakauer
Doing so involved breaking dependencies between //pkg/tcpip and the rest of gVisor, which are discouraged anyways. Tested on the Go branch via: gvisor.dev/gvisor/pkg/tcpip/... Addresses #1446. PiperOrigin-RevId: 363081778
2021-03-15[op] Make gofer client handle return partial write length when err is nil.Ayush Ranjan
If there was a partial write (when not using the host FD) which did not generate an error, we were incorrectly returning the number of bytes attempted to write instead of the number of bytes actually written. PiperOrigin-RevId: 363058989
2021-03-15Merge pull request #5618 from iangudger:unix-transport-racegVisor bot
PiperOrigin-RevId: 362999220
2021-03-11improve readability of ports packageKevin Krakauer
Lots of small changes: - simplify package API via Reservation type - rename some single-letter variable names that were hard to follow - rename some types PiperOrigin-RevId: 362442366
2021-03-11fusefs: Implement default_permissions and allow_other mount options.Rahat Mahmood
By default, fusefs defers node permission checks to the server. The default_permissions mount option enables the usual unix permission checks based on the node owner and mode bits. Previously fusefs was incorrectly checking permissions unconditionally. Additionally, fusefs should restrict filesystem access to processes started by the mount owner to prevent the fuse daemon from gaining priviledge over other processes. The allow_other mount option overrides this behaviour. Previously fusefs was incorrectly skipping this check. Updates #3229 PiperOrigin-RevId: 362419092
2021-03-11Clear Merkle tree files in RuntimeEnable modeChong Cai
The Merkle tree files need to be cleared before enabling to avoid redundant content. PiperOrigin-RevId: 362409591
2021-03-11Report filesystem-specific mount options.Rahat Mahmood
PiperOrigin-RevId: 362406813
2021-03-11Move Arch specific code to arch specific files.Bhasker Hariharan
PiperOrigin-RevId: 362297474
2021-03-09Give TCP flags a dedicated typeZeling Feng
- Implement Stringer for it so that we can improve error messages. - Use TCPFlags through the code base. There used to be a mixed usage of byte, uint8 and int as TCP flags. PiperOrigin-RevId: 361940150
2021-03-08Implement /proc/sys/net/ipv4/ip_local_port_rangeKevin Krakauer
Speeds up the socket stress tests by a couple orders of magnitude. PiperOrigin-RevId: 361721050
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