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2020-10-30Separate kernel.Task.AsCopyContext() into CopyContext() and OwnCopyContext().Jamie Liu
kernel.copyContext{t} cannot be used outside of t's task goroutine, for three reasons: - t.CopyScratchBuffer() is task-goroutine-local. - Calling t.MemoryManager() without running on t's task goroutine or locking t.mu violates t.MemoryManager()'s preconditions. - kernel.copyContext passes t as context.Context to MM IO methods, which is illegal outside of t's task goroutine (cf. kernel.Task.Value()). Fix this by splitting AsCopyContext() into CopyContext() (which takes an explicit context.Context and is usable outside of the task goroutine) and OwnCopyContext() (which uses t as context.Context, but is only usable by t's task goroutine). PiperOrigin-RevId: 339933809
2020-10-30Merge pull request #4564 from zhlhahaha:1981gVisor bot
PiperOrigin-RevId: 339921446
2020-10-29Automated rollback of changelist 339675182Dean Deng
PiperOrigin-RevId: 339750876
2020-10-29Make RedirectTarget thread safeKevin Krakauer
Fixes #4613. PiperOrigin-RevId: 339746784
2020-10-29Fix TCP wildcard bind failure when netstack is v6 onlyTing-Yu Wang
TCP endpoint unconditionly binds to v4 even when the stack only supports v6. PiperOrigin-RevId: 339739392
2020-10-29Keep magic constants out of netstackKevin Krakauer
PiperOrigin-RevId: 339721152
2020-10-29Delay goroutine creation during TCP handshake for accept/connect.Dean Deng
Refactor TCP handshake code so that when connect is initiated, the initial SYN is sent before creating a goroutine to handle the rest of the handshake (which blocks). Similarly, the initial SYN-ACK is sent inline when SYN is received during accept. Some additional cleanup is done as well. Eventually we would like to complete connections in the dispatcher without requiring a wakeup to complete the handshake. This refactor makes that easier. Updates #231 PiperOrigin-RevId: 339675182
2020-10-28Add leak checking for kernfs.Dentry.Dean Deng
Updates #1486. PiperOrigin-RevId: 339581879
2020-10-28Add logging option to leak checker.Dean Deng
Also refactor the template and CheckedObject interface to make this cleaner. Updates #1486. PiperOrigin-RevId: 339577120
2020-10-28Merge pull request #4630 from lemin9538:lemin_arm64_devgVisor bot
PiperOrigin-RevId: 339540747
2020-10-28Invalidate overlay.dentry.dirents during open() file creation.Jamie Liu
Updates #1199 PiperOrigin-RevId: 339528827
2020-10-28Avoid time.Now in NUDTamir Duberstein
Use the stack clock instead. Change NeighborEntry.UpdatedAt to UpdatedAtNanos. PiperOrigin-RevId: 339520566
2020-10-28[vfs] Refactor hostfs mmap into kernfs util.Ayush Ranjan
PiperOrigin-RevId: 339505487
2020-10-27Merge pull request #4598 from lubinszARM:pr_kvm_precise_syncgVisor bot
PiperOrigin-RevId: 339404936
2020-10-28arm64: need to restore the sentry's TLS when in EL1Min Le
Signed-off-by: Min Le <lemin.lm@antgroup.com>
2020-10-27Add support for Timestamp and RecordRoute IP optionsJulian Elischer
IPv4 options extend the size of the IP header and have a basic known format. The framework can process that format without needing to know about every possible option. We can add more code to handle additional option types as we need them. Bad options or mangled option entries can result in ICMP Parameter Problem packets. The first types we support are the Timestamp option and the Record Route option, included in this change. The options are processed at several points in the packet flow within the Network stack, with slightly different requirements. The framework includes a mechanism to control this at each point. Support has been added for such points which are only present in upcoming CLs such as during packet forwarding and fragmentation. With this change, 'ping -R' and 'ping -T' work against gVisor and Fuchsia. $ ping -R 192.168.1.2 PING 192.168.1.2 (192.168.1.2) 56(124) bytes of data. 64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=0.990 ms NOP RR: 192.168.1.1 192.168.1.2 192.168.1.1 $ ping -T tsprespec 192.168.1.2 192.168.1.1 192.168.1.2 PING 192.168.1.2 (192.168.1.2) 56(124) bytes of data. 64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=1.20 ms TS: 192.168.1.2 71486821 absolute 192.168.1.1 746 Unit tests included for generic options, Timestamp options and Record Route options. PiperOrigin-RevId: 339379076
2020-10-27Add SHA512 to merkle tree libraryChong Cai
PiperOrigin-RevId: 339377254
2020-10-27Wake up any waiters on an ICMP error on UDP socket.Bhasker Hariharan
This change wakes up any waiters when we receive an ICMP port unreachable control packet on an UDP socket as well as sets waiter.EventErr in the result returned by Readiness() when e.lastError is not nil. The latter is required where an epoll()/poll() is done after the error is already handled since we will never notify again in such cases. PiperOrigin-RevId: 339370469
2020-10-27Implement /proc/[pid]/memLennart
This PR implements /proc/[pid]/mem for `pkg/sentry/fs` (refer to #2716) and `pkg/sentry/fsimpl`. @majek COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/4060 from lnsp:proc-pid-mem 2caf9021254646f441be618a9bb5528610e44d43 PiperOrigin-RevId: 339369629
2020-10-27Pass NeighborEntry in NUD callbacksTamir Duberstein
...instead of passing its fields piecemeal. PiperOrigin-RevId: 339345899
2020-10-27Assign VFS2 overlay device numbers based on layer device numbers.Jamie Liu
In VFS1's overlayfs, files use the device and inode number of the lower layer inode if one exists, and the upper layer inode otherwise. The former behavior is inefficient (requiring lower layer lookups even if the file exists and is otherwise wholly determined by the upper layer), and somewhat dangerous if the lower layer is also observable (since both the overlay and lower layer file will have the same device and inode numbers and thus appear to be the same file, despite being behaviorally different). VFS2 overlayfs imitates Linux overlayfs (in its default configuration) instead; it always uses the inode number from the originating layer, but synthesizes a unique device number for directories and another device number for non-directory files that have not been copied-up. As it turns out, the latter is insufficient (in VFS2, and possibly Linux as well), because a given layer may include files with different device numbers. If two distinct files on such a layer have device number X and Y respectively, but share inode number Z, then the overlay will map both files to some private device number X' and inode number Z, potentially confusing applications. Fix this by assigning synthetic device numbers based on the lower layer's device number, rather than the lower layer's vfs.Filesystem. PiperOrigin-RevId: 339300341
2020-10-27Add basic address deletion to netlinkIan Lewis
Updates #3921 PiperOrigin-RevId: 339195417
2020-10-26Implement command IPC_STAT for semctl.Jing Chen
PiperOrigin-RevId: 339166854
2020-10-26Add verity tests for deleted/renamed casesChong Cai
Also change verity test to use a context with an active task. This is required to delete/rename the file in the underlying file system. PiperOrigin-RevId: 339146445
2020-10-26[vfs] kernfs: Implement LRU cache for kernfs dentries.Ayush Ranjan
Much like the VFS2 gofer client, kernfs too now caches dentries. The size of the LRU cache is configurable via mount options. Have adopted the same reference semantics from gofer client dentry. Only sysfs and procfs use this LRU cache. The rest of the kernfs users (devpts, fusefs, host, pipefs, sockfs) still use the no cache approach. PiperOrigin-RevId: 339139835
2020-10-26Fix SCM Rights S/R reference leak.Dean Deng
Control messages collected when peeking into a socket were being leaked. PiperOrigin-RevId: 339114961
2020-10-24Implement Seek in verity fsChong Cai
PiperOrigin-RevId: 338847417
2020-10-24Add leak checking to vfs2 structures that cannot use the refs_vfs2 template.Dean Deng
Updates #1486. PiperOrigin-RevId: 338832085
2020-10-24Send ICMP error message if IP fragment reassembly failsToshi Kikuchi
Fixes #4427, #4428 PiperOrigin-RevId: 338805047
2020-10-23Internal change.Chong Cai
PiperOrigin-RevId: 338798433
2020-10-23Fix nogo tests in //pkg/sentry/socket/...Ting-Yu Wang
PiperOrigin-RevId: 338784921
2020-10-23Support VFS2 save/restore.Jamie Liu
Inode number consistency checks are now skipped in save/restore tests for reasons described in greatest detail in StatTest.StateDoesntChangeAfterRename. They pass in VFS1 due to the bug described in new test case SimpleStatTest.DifferentFilesHaveDifferentDeviceInodeNumberPairs. Fixes #1663 PiperOrigin-RevId: 338776148
2020-10-23Introduce SemidDs struct for amd64 and arm64.Jing Chen
PiperOrigin-RevId: 338756277
2020-10-23[vfs] kernfs: cleanup/refactor.Ayush Ranjan
PiperOrigin-RevId: 338728070
2020-10-23//pkg/state fixes for VFS2.Jamie Liu
- When encodeState.resolve() determines that the resolved reflect.Value is contained by a previously-resolved object, set wire.Ref.Type to the containing object's type (existing.obj.Type()) rather than the contained value's type (obj.Type()). - When encodeState.resolve() determines that the resolved reflect.Value contains a previously-resolved object, handle cases where the new object contains *multiple* previously-resolved objects. (This may cause previously-allocated object IDs to become unused; to facilitate this, change encodeState.pending to a map, and change the wire format to prefix each object with its object ID.) - Add encodeState.encodedStructs to avoid redundant encoding of structs, since deduplication of objects via encodeState.resolve() doesn't work for objects instantiated by StateSave() and passed to SaveValue() (i.e. fields tagged `state:".(whatever)"`). - Make unexported array fields deserializable via slices that refer to them by casting away their unexportedness in decodeState.decodeObject(). Updates #1663 PiperOrigin-RevId: 338727687
2020-10-23Wait before transitioning NUD entries from Probe to FailedSam Balana
Wait an additional RetransmitTimer duration after the last probe before transitioning to Failed. The previous implementation transitions immediately to Failed after sending the last probe, which is erroneous behavior. PiperOrigin-RevId: 338723794
2020-10-23Implement Read in gvisor verity fsChong Cai
Read is implemented by PRead, with offset obtained from Seek. PiperOrigin-RevId: 338718587
2020-10-23[vfs] kernfs: Implement remaining InodeAttr fields.Ayush Ranjan
Added the following fields in kernfs.InodeAttr: - blockSize - atime - mtime - ctime Also resolved all TODOs for #1193. Fixes #1193 PiperOrigin-RevId: 338714527
2020-10-23Fix TestTCPTimeWaitNewSyn.Bhasker Hariharan
Drain the notification channel after first accept as in case the first accept never blocked then the notification for the first accept will still be in the channel causing the second accept to fail as it will try to wait on the channel and return immediately due to the older notification even though there is no connection yet in the accept queue. PiperOrigin-RevId: 338710062
2020-10-23Check for verity file/Merkle file when reopenChong Cai
Even if the child dentry has been cached, we should still check whether the file and the corresponding Merkle tree file exist as expected. This ensures that we can detect deletion/renaming of files that have been previous enabled and opened. Also make all verification failures to return EIO. This helps to test verify failures. PiperOrigin-RevId: 338709055
2020-10-23Support getsockopt for SO_ACCEPTCONN.Nayana Bidari
The SO_ACCEPTCONN option is used only on getsockopt(). When this option is specified, getsockopt() indicates whether socket listening is enabled for the socket. A value of zero indicates that socket listening is disabled; non-zero that it is enabled. PiperOrigin-RevId: 338703206
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
2020-10-23Decrement 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
2020-10-23Rewrite 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
2020-10-22Pass 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
2020-10-22arm64 kvm: added the implementation of setSystemTimeLegacy()Bin Lu
I have added support for setSystemTimeLegacy() by setting cntvoff. With this pr, TestRdtsc and other kvm syscall test cases(nanosleep, wait...) can be passed on Arm64. TO-DO: Add precise synchronization to KVM for Arm64. Reference PR: https://github.com/google/gvisor/pull/4397 Signed-off-by: Bin Lu <bin.lu@arm.com>
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
2020-10-21Check for nil in kernel.FSContext functions.Dean Deng
Reported-by: syzbot+c0e175d2b10708314eb3@syzkaller.appspotmail.com PiperOrigin-RevId: 338386575
2020-10-21Merge pull request #4535 from lubinszARM:pr_kvm_exec_binary_1gVisor bot
PiperOrigin-RevId: 338321125
2020-10-20Fix nogo test in //pkg/tcpip/...Ting-Yu Wang
PiperOrigin-RevId: 338168977
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