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2021-01-19platform/ptrace: workaround a kernel ptrace issue on ARM64Andrei Vagin
On ARM64, when ptrace stops on a system call, it uses the x7 register to indicate whether the stop has been signalled from syscall entry or syscall exit. This means that we can't get a value of this register and we can't change it. More details are in the comment for tracehook_report_syscall in arch/arm64/kernel/ptrace.c. This happens only if we stop on a system call, so let's queue a signal, resume a stub thread and catch it on a signal handling. Fixes: #5238 PiperOrigin-RevId: 352668695
2021-01-15Remove count argument from tcpip.Endpoint.ReadTamir Duberstein
The same intent can be specified via the io.Writer. PiperOrigin-RevId: 352098747
2021-01-14Simplify the pipe implementation.Jamie Liu
- Remove the pipe package's dependence on the buffer package, which becomes unused as a result. The buffer package is currently intended to serve two use cases, pipes and temporary buffers, and does neither optimally as a result; this change facilitates retooling the buffer package to better serve the latter. - Pass callbacks taking safemem.BlockSeq to the internal pipe I/O methods, which makes most callbacks trivial. - Fix VFS1's splice() and tee() to immediately return if a pipe returns a partial write. PiperOrigin-RevId: 351911375
2021-01-14Add stats for ARPArthur Sfez
Fixes #4963 Startblock: has LGTM from sbalana and then add reviewer ghanan PiperOrigin-RevId: 351886320
2021-01-14Check for existence before permissionsFabricio Voznika
Return EEXIST when overwritting a file as long as the caller has exec permission on the parent directory, even if the caller doesn't have write permission. Also reordered the mount write check, which happens before permission is checked. Closes #5164 PiperOrigin-RevId: 351868123
2021-01-13Do not resolve remote link address at transport layerGhanan Gowripalan
Link address resolution is performed at the link layer (if required) so we can defer it from the transport layer. When link resolution is required, packets will be queued and sent once link resolution completes. If link resolution fails, the transport layer will receive a control message indicating that the stack failed to route the packet. tcpip.Endpoint.Write no longer returns a channel now that writes do not wait for link resolution at the transport layer. tcpip.ErrNoLinkAddress is no longer used so it is removed. Removed calls to stack.Route.ResolveWith from the transport layer so that link resolution is performed when a route is created in response to an incoming packet (e.g. to complete TCP handshakes or send a RST). Tests: - integration_test.TestForwarding - integration_test.TestTCPLinkResolutionFailure Fixes #4458 RELNOTES: n/a PiperOrigin-RevId: 351684158
2021-01-13Merge pull request #4792 from lubinszARM:pr_kvm_testgVisor bot
PiperOrigin-RevId: 351638451
2021-01-12Remove useless cached stateTamir Duberstein
Simplify some logic while I'm here. PiperOrigin-RevId: 351491593
2021-01-12Fix simple mistakes identified by goreportcard.Adin Scannell
These are primarily simplification and lint mistakes. However, minor fixes are also included and tests added where appropriate. PiperOrigin-RevId: 351425971
2021-01-11Fix Go branch for arm64.Adin Scannell
This requires several changes: * Templates must preserve relevant tags. * Pagetables templates are split into two targets, each preserving tags. * The binary VDSO is similarly split into two targets, with some juggling. * The top level tools/go_branch.sh now does a crossbuild of ARM64 as well, and checks and merges the results of the two branches together. Fixes #5178 PiperOrigin-RevId: 351304330
2021-01-08Merge pull request #4933 from lubinszARM:pr_kvm_el0_exceptionsgVisor bot
PiperOrigin-RevId: 350862699
2021-01-07Merge pull request #5207 from avagin:arm64-crossgVisor bot
PiperOrigin-RevId: 350691246
2021-01-07netstack: Refactor tcpip.Endpoint.ReadTing-Yu Wang
Read now takes a destination io.Writer, count, options. Keeping the method name Read, in contrast to the Write method. This enables: * direct transfer of views under VV * zero copy It also eliminates the need for sentry to keep a slice of view because userspace had requested a read that is smaller than the view returned, removing the complexity there. Read/Peek/ReadPacket are now consolidated together and some duplicate code is removed. PiperOrigin-RevId: 350636322
2021-01-07Implement the semtimedop syscallAndrei Vagin
Signed-off-by: Andrei Vagin <avagin@gmail.com>
2021-01-06Support add/remove IPv6 multicast group sock optGhanan Gowripalan
IPv4 was always supported but UDP never supported joining/leaving IPv6 multicast groups via socket options. Add: IPPROTO_IPV6, IPV6_JOIN_GROUP/IPV6_ADD_MEMBERSHIP Remove: IPPROTO_IPV6, IPV6_LEAVE_GROUP/IPV6_DROP_MEMBERSHIP Test: integration_test.TestUDPAddRemoveMembershipSocketOption PiperOrigin-RevId: 350396072
2021-01-06Merge pull request #5177 from lubinszARM:pr_kernel_globalgVisor bot
PiperOrigin-RevId: 350375461
2021-01-05Fix panic when parsing SO_TIMESTAMP cmsgKevin Krakauer
PiperOrigin-RevId: 350223482
2021-01-05Add benchmarks targets to BuildKite.Adin Scannell
This includes minor fix-ups: * Handle SIGTERM in runsc debug, to exit gracefully. * Fix cmd.debug.go opening all profiles as RDONLY. * Fix the test name in fio_test.go, and encode the block size in the test. PiperOrigin-RevId: 350205718
2021-01-05fs/fuse: check that a task has a specified file descriptorAndrei Vagin
Reported-by: syzbot+814105309d2ae8651084@syzkaller.appspotmail.com PiperOrigin-RevId: 350159452
2020-12-31Add missing error checks for FileDescription.Init.Dean Deng
Syzkaller discovered this bug in pipefs by doing something quite strange: creat(&(0x7f0000002a00)='./file1\x00', 0x0) mount(&(0x7f0000000440)=ANY=[], &(0x7f00000002c0)='./file1\x00', &(0x7f0000000300)='devtmpfs\x00', 0x20000d, 0x0) creat(&(0x7f0000000000)='./file1/file0\x00', 0x0) This can be reproduced with: touch mymount mkfifo /dev/mypipe mount -o ro -t devtmpfs devtmpfs mymount echo 123 > mymount/mypipe PiperOrigin-RevId: 349687714
2020-12-29Make profiling commands synchronous.Adin Scannell
This allows for a model of profiling when you can start collection, and it will terminate when the sandbox terminates. Without this synchronous call, it is effectively impossible to collect length blocking and mutex profiles. PiperOrigin-RevId: 349483418
2020-12-29arm64 kvm: revert some kpti related codes, and configure upper pagetable as ↵Robin Luk
global In order to improve the performance, some kpti related codes(TCR.A1) have been reverted, and set kernel pagetable as global. Signed-off-by: Robin Luk <lubin.lu@antgroup.com>
2020-12-23vfs1: don't allow to open socket filesAndrei Vagin
open() has to return ENXIO in this case. O_PATH isn't supported by vfs1. PiperOrigin-RevId: 348820478
2020-12-22Move SO_BINDTODEVICE to socketops.Nayana Bidari
PiperOrigin-RevId: 348696094
2020-12-17Set verityMu to be state nosaveChong Cai
PiperOrigin-RevId: 348092999
2020-12-17Fix seek on /proc/pid/cmdline when task is zombie.Nicolas Lacasse
PiperOrigin-RevId: 348056159
2020-12-17[netstack] Implement IP(V6)_RECVERR socket option.Ayush Ranjan
PiperOrigin-RevId: 348055514
2020-12-17Set process group and session on host TTYFabricio Voznika
Closes #5128 PiperOrigin-RevId: 348052446
2020-12-17[netstack] Implement MSG_ERRQUEUE flag for recvmsg(2).Ayush Ranjan
Introduces the per-socket error queue and the necessary cmsg mechanisms. PiperOrigin-RevId: 348028508
2020-12-16Merge pull request #4880 from lubinszARM:pr_tlbi_02gVisor bot
PiperOrigin-RevId: 347890782
2020-12-15Internal change.Andrei Vagin
PiperOrigin-RevId: 347720083
2020-12-15Implement command SEM_INFO and SEM_STAT for semctl.Jing Chen
PiperOrigin-RevId: 347711998
2020-12-15Change violation mode to an enumChong Cai
PiperOrigin-RevId: 347706953
2020-12-15[syzkaller] Avoid AIOContext from resurrecting after being marked dead.Ayush Ranjan
syzkaller reported the closing of a nil channel. This is only possible when the AIOContext was destroyed twice. Some scenarios that could lead to this: - It died and then some called aioCtx.Prepare() on it and then killed it again which could cause the double destroy. The context could have been destroyed in between the call to LookupAIOContext() and Prepare(). - aioManager was destroyed but it did not update the contexts map. So Lookup could still return a dead AIOContext and then someone could call Prepare on it and kill it again. So added a check in aioCtx.Prepare() for the context being dead. This will prevent a dead context from resurrecting. Also refactored code to destroy the aioContext consistently. Earlier we were not munmapping the aioContexts that were destroyed upon aioManager destruction. Reported-by: syzbot+ef6a588d0ce6059991d2@syzkaller.appspotmail.com PiperOrigin-RevId: 347704347
2020-12-15[netstack] Make recvmsg(2) call to host in hostinet even if dst is empty.Ayush Ranjan
We want to make the recvmsg syscall to the host regardless of if the dst is empty or not so that: - Host can populate the control messages if necessary. - Host can return sender address. - Host can return appropriate errors. Earlier because we were using the IOSequence.CopyOutFrom() API, the usermem package does not even call the Reader function if the destination is empty (as an optimization). PiperOrigin-RevId: 347684566
2020-12-15Internal change.gVisor bot
PiperOrigin-RevId: 347671070
2020-12-15Merge pull request #4722 from zhlhahaha:2010gVisor bot
PiperOrigin-RevId: 347660920
2020-12-14[netstack] Update raw socket and hostinet control message parsing.Ayush Ranjan
There are surprisingly few syscall tests that run with hostinet. For example running the following command only returns two results: `bazel query test/syscalls:all | grep hostnet` I think as a result, as our control messages evolved, hostinet was left behind. Update it to support all control messages netstack supports. This change also updates sentry's control message parsing logic to make it up to date with all the control messages we support. PiperOrigin-RevId: 347508892
2020-12-14Move SO_LINGER option to socketops.Nayana Bidari
PiperOrigin-RevId: 347437786
2020-12-14Do not check for reference leaks after saving.Dean Deng
We should not assert that all resources are dropped after saving. PiperOrigin-RevId: 347420131
2020-12-14Move SO_ERROR and SO_OOBINLINE option to socketops.Nayana Bidari
SO_OOBINLINE option is set/get as boolean value, which is the same as linux. As we currently do not support disabling this option, we always return it as true. PiperOrigin-RevId: 347413905
2020-12-11Internal change.gVisor bot
PiperOrigin-RevId: 347091372
2020-12-11Remove existing nogo exceptions.Adin Scannell
PiperOrigin-RevId: 347047550
2020-12-11[netstack] Decouple tcpip.ControlMessages from the IP control messges.Ayush Ranjan
tcpip.ControlMessages can not contain Linux specific structures which makes it painful to convert back and forth from Linux to tcpip back to Linux when passing around control messages in hostinet and raw sockets. Now we convert to the Linux version of the control message as soon as we are out of tcpip. PiperOrigin-RevId: 347027065
2020-12-11Make semctl IPC_INFO cmd return the index of highest used entry.Jing Chen
PiperOrigin-RevId: 346973338
2020-12-10Change merkle root file name to avoid collisionChong Cai
PiperOrigin-RevId: 346923826
2020-12-09Add support for IP_RECVORIGDSTADDR IP option.Bhasker Hariharan
Fixes #5004 PiperOrigin-RevId: 346643745
2020-12-09Add //pkg/sync:generic_atomicptrmap.Jamie Liu
AtomicPtrMap is a generic concurrent map from arbitrary keys to arbitrary pointer values. Benchmarks: name time/op StoreDelete/RWMutexMap-12 335ns ± 1% StoreDelete/SyncMap-12 705ns ± 3% StoreDelete/AtomicPtrMap-12 287ns ± 4% StoreDelete/AtomicPtrMapSharded-12 289ns ± 1% LoadOrStoreDelete/RWMutexMap-12 342ns ± 2% LoadOrStoreDelete/SyncMap-12 662ns ± 2% LoadOrStoreDelete/AtomicPtrMap-12 290ns ± 7% LoadOrStoreDelete/AtomicPtrMapSharded-12 293ns ± 2% LookupPositive/RWMutexMap-12 101ns ±26% LookupPositive/SyncMap-12 202ns ± 2% LookupPositive/AtomicPtrMap-12 71.1ns ± 2% LookupPositive/AtomicPtrMapSharded-12 73.2ns ± 1% LookupNegative/RWMutexMap-12 119ns ± 1% LookupNegative/SyncMap-12 154ns ± 1% LookupNegative/AtomicPtrMap-12 84.7ns ± 3% LookupNegative/AtomicPtrMapSharded-12 86.8ns ± 1% Concurrent/FixedKeys_1PercentWrites_RWMutexMap-12 1.32µs ± 2% Concurrent/FixedKeys_1PercentWrites_SyncMap-12 52.7ns ±10% Concurrent/FixedKeys_1PercentWrites_AtomicPtrMap-12 31.8ns ±20% Concurrent/FixedKeys_1PercentWrites_AtomicPtrMapSharded-12 24.0ns ±15% Concurrent/FixedKeys_10PercentWrites_RWMutexMap-12 860ns ± 3% Concurrent/FixedKeys_10PercentWrites_SyncMap-12 68.8ns ±20% Concurrent/FixedKeys_10PercentWrites_AtomicPtrMap-12 98.6ns ± 7% Concurrent/FixedKeys_10PercentWrites_AtomicPtrMapSharded-12 42.0ns ±25% Concurrent/FixedKeys_50PercentWrites_RWMutexMap-12 1.17µs ± 3% Concurrent/FixedKeys_50PercentWrites_SyncMap-12 136ns ±34% Concurrent/FixedKeys_50PercentWrites_AtomicPtrMap-12 286ns ± 3% Concurrent/FixedKeys_50PercentWrites_AtomicPtrMapSharded-12 115ns ±35% Concurrent/ChangingKeys_1PercentWrites_RWMutexMap-12 1.27µs ± 2% Concurrent/ChangingKeys_1PercentWrites_SyncMap-12 5.01µs ± 3% Concurrent/ChangingKeys_1PercentWrites_AtomicPtrMap-12 38.1ns ± 3% Concurrent/ChangingKeys_1PercentWrites_AtomicPtrMapSharded-12 22.6ns ± 2% Concurrent/ChangingKeys_10PercentWrites_RWMutexMap-12 1.08µs ± 2% Concurrent/ChangingKeys_10PercentWrites_SyncMap-12 5.97µs ± 1% Concurrent/ChangingKeys_10PercentWrites_AtomicPtrMap-12 390ns ± 2% Concurrent/ChangingKeys_10PercentWrites_AtomicPtrMapSharded-12 93.6ns ± 1% Concurrent/ChangingKeys_50PercentWrites_RWMutexMap-12 1.77µs ± 2% Concurrent/ChangingKeys_50PercentWrites_SyncMap-12 8.07µs ± 2% Concurrent/ChangingKeys_50PercentWrites_AtomicPtrMap-12 1.61µs ± 2% Concurrent/ChangingKeys_50PercentWrites_AtomicPtrMapSharded-12 386ns ± 1% Updates #231 PiperOrigin-RevId: 346614776
2020-12-09Prepare for supporting cross compilation.Andrei Vagin
PiperOrigin-RevId: 346496532
2020-12-07Fix error handling on fusefs mount.Rahat Mahmood
Don't propagate arbitrary golang errors up from fusefs because errors that don't map to an errno result in a sentry panic. Reported-by: syzbot+697cb635346e456fddfc@syzkaller.appspotmail.com PiperOrigin-RevId: 346220306
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