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2020-11-13Merge release-20201030.0-79-g62db1fad2 (automated)gVisor bot
2020-11-12Fix misuses of kernel.Task as context.Context.Jamie Liu
kernel.Task can only be used as context.Context by that Task's task goroutine. This is violated in at least two places: - In any case where one thread accesses the /proc/[tid] of any other thread, passing the kernel.Task for [tid] as the context.Context is incorrect. - Task.rebuildTraceContext() may be called by Kernel.RebuildTraceContexts() outside the scope of any task goroutine. Fix these (as well as a data race on Task.traceContext discovered during the course of finding the latter). PiperOrigin-RevId: 342174404
2020-11-12Add children names into verity hashChong Cai
children names map can be used to verify whether a child is expected during walking, so that we can detect unexpected modifications that deleted/renamed both the target file and the corresponding merkle tree file. PiperOrigin-RevId: 342170715
2020-11-13Merge release-20201030.0-77-gd700ba22a (automated)gVisor bot
2020-11-12Pad with a loop rather than a copy from an allocation.Julian Elischer
Add a unit test for ipv4.Encode and a round trip test. PiperOrigin-RevId: 342169517
2020-11-13Merge release-20201030.0-75-g468caff45 (automated)gVisor bot
2020-11-12Rename kernel.TaskContext to kernel.TaskImage.Jamie Liu
This reduces confusion with context.Context (which is also relevant to kernel.Tasks) and is consistent with existing function kernel.LoadTaskImage(). PiperOrigin-RevId: 342167298
2020-11-13Merge release-20201030.0-74-g1a972411b (automated)gVisor bot
2020-11-12Move packet handling to NetworkEndpointGhanan Gowripalan
The NIC should not hold network-layer state or logic - network packet handling/forwarding should be performed at the network layer instead of the NIC. Fixes #4688 PiperOrigin-RevId: 342166985
2020-11-13Merge release-20201030.0-73-gae7ab0a33 (automated)gVisor bot
2020-11-12Filter dentries with non-zero refs in VFS2 gofer/overlay checks.Jamie Liu
PiperOrigin-RevId: 342161204
2020-11-12Refactor merkletree testsChong Cai
Separate the test cases from TestVerify so that the test names reflect the test case better. PiperOrigin-RevId: 342152754
2020-11-12Merge release-20201030.0-70-gac62743e3 (automated)gVisor bot
2020-11-11Read fsimpl/tmpfs timestamps atomically.Jamie Liu
PiperOrigin-RevId: 341982672
2020-11-11Add documentation for reference counting.Dean Deng
Fixes #1486. PiperOrigin-RevId: 341966640
2020-11-11Merge release-20201030.0-68-g9c4102896 (automated)gVisor bot
2020-11-11Teach netstack how to add options to IPv4 packetsJulian Elischer
Most packets don't have options but they are an integral part of the standard. Teaching the ipv4 code how to handle them will simplify future testing and use. Because Options are so rare it is worth making sure that the extra work is kept out of the fast path as much as possible. Prior to this change, all usages of the IHL field of the IPv4Fields/Encode system set it to the same constant value except in a couple of tests for bad values. From this change IHL will not be a constant as it will depend on the size of any Options. Since ipv4.Encode() now handles the options it becomes a possible source of errors to let the callers set this value, so remove it entirely and calculate the value from the size of the Options if present (or not) therefore guaranteeing a correct value. Fixes #4709 RELNOTES: n/a PiperOrigin-RevId: 341864765
2020-11-10Add logging to internal gvisor when checking for kcov.Dean Deng
May help with debugging https://syzkaller.appspot.com/bug?id=0d717bd7028dceeb4b38f09aab2841c398b41d81 PiperOrigin-RevId: 341640485
2020-11-09Merge release-20201030.0-60-g199fcd0fe (automated)gVisor bot
2020-11-09Skip `EventHUp` notify in `FIN_WAIT2` on a socket close.Mithun Iyer
This Notify was added as part of cl/279106406; but notifying `EventHUp` in `FIN_WAIT2` is incorrect, as we want to only notify later on `TIME_WAIT` or a reset. However, we do need to notify any blocked waiters of an activity on the endpoint with `EventIn`|`EventOut`. PiperOrigin-RevId: 341490913
2020-11-09Merge release-20201030.0-59-g2fcca60a7 (automated)gVisor bot
2020-11-09net: connect to the ipv4 localhost returns ENETUNREACH if the address isn't setAndrei Vagin
cl/340002915 modified the code to return EADDRNOTAVAIL if connect is called for a localhost address which isn't set. But actually, Linux returns EADDRNOTAVAIL for ipv6 addresses and ENETUNREACH for ipv4 addresses. Updates #4735 PiperOrigin-RevId: 341479129
2020-11-09Merge release-20201030.0-57-gcbca5b2ed (automated)gVisor bot
2020-11-09Print a debug message if /sys/kernel/debug/kcov is availableAndrei Vagin
This will help to debug: https://syzkaller.appspot.com/bug?id=0d717bd7028dceeb4b38f09aab2841c398b41d81 PiperOrigin-RevId: 341458715
2020-11-09Merge release-20201030.0-56-gd4e0b829e (automated)gVisor bot
2020-11-09Merge pull request #4683 from lemin9538:lemin_fpsmid_fixgVisor bot
PiperOrigin-RevId: 341445910
2020-11-09Merge release-20201030.0-53-g0fb5353e4 (automated)gVisor bot
2020-11-09Initialize references with a value of 1.Dean Deng
This lets us avoid treating a value of 0 as one reference. All references using the refsvfs2 template must call InitRefs() before the reference is incremented/decremented, or else a panic will occur. Therefore, it should be pretty easy to identify missing InitRef calls during testing. Updates #1486. PiperOrigin-RevId: 341411151
2020-11-07Merge release-20201030.0-52-g78cce3a46 (automated)gVisor bot
2020-11-06Allow VFS2 gofer.dentries to have separate read and write FDs.Jamie Liu
This is necessary to allow writes to files opened with O_WRONLY to go through host FDs. PiperOrigin-RevId: 341174509
2020-11-07Merge release-20201030.0-48-gfe9442d32 (automated)gVisor bot
2020-11-06[vfs] Return EEXIST when file already exists and rp.MustBeDir() is true.Ayush Ranjan
This is consistent with what Linux does. This was causing a PHP runtime test failure. Fixed it for VFS2. PiperOrigin-RevId: 341155209
2020-11-07Merge release-20201030.0-47-g3ac00fe9c (automated)gVisor bot
2020-11-06Implement command GETNCNT for semctl.Jing Chen
PiperOrigin-RevId: 341154192
2020-11-07Merge release-20201030.0-46-g5288e1941 (automated)gVisor bot
2020-11-06Trim link headers from buffer clone when sniffingGhanan Gowripalan
PiperOrigin-RevId: 341135083
2020-11-06Merge release-20201030.0-44-g9e82747d6 (automated)gVisor bot
2020-11-06Return early in walkSACK if segment has no SACK blocks.Bhasker Hariharan
This avoids a needless allocation. Updates #231 PiperOrigin-RevId: 341113160
2020-11-06Merge release-20201030.0-43-g949dc1d09 (automated)gVisor bot
2020-11-06[vfs] overlayfs: Do not unlink non-existing whiteout during file creation.Ayush Ranjan
We can reuse information about whether a whiteout exists on a given file path from stepLocked when creating a file at that path. This helps save an Unlink call to the upper filesystem if the whiteout does NOT exist (common case). Plumbs this information from lookupLocked() -> getChildLocked() -> stepLocked(). This also helped save a Lookup in RenameAt(). Fixes #1199 PiperOrigin-RevId: 341105351
2020-11-06Merge release-20201030.0-42-gbcd883f09 (automated)gVisor bot
2020-11-06Avoid extra DecRef on kernfs root for "kept" dentries.Dean Deng
The root dentry was not created through Inode.Lookup, so we should not release a reference even if inode.Keep() is true. PiperOrigin-RevId: 341103220
2020-11-06Merge release-20201030.0-41-g53eeb06ef (automated)gVisor bot
2020-11-06Fix infinite loop when splicing to pipes/eventfds.Nicolas Lacasse
Writes to pipes of size < PIPE_BUF are guaranteed to be atomic, so writes larger than that will return EAGAIN if the pipe has capacity < PIPE_BUF. Writes to eventfds will return EAGAIN if the write would cause the eventfd value to go over the max. In both such cases, calling Ready() on the FD will return true (because it is possible to write), but specific kinds of writes will in fact return EAGAIN. This CL fixes an infinite loop in splice and sendfile (VFS1 and VFS2) by forcing skipping the readiness check for the outfile in send, splice, and tee. PiperOrigin-RevId: 341102260
2020-11-06Merge release-20201030.0-40-g955e09dfb (automated)gVisor bot
2020-11-06Do not send to the zero portGhanan Gowripalan
Port 0 is not meant to identify any remote port so attempting to send a packet to it should return an error. PiperOrigin-RevId: 341009528
2020-11-06Merge release-20201030.0-39-g29683f359 (automated)gVisor bot
2020-11-06Cap iovec array length in //pkg/sentry/hostfd.Jamie Liu
PiperOrigin-RevId: 341001328
2020-11-06Merge release-20201030.0-38-g06e33cd73 (automated)gVisor bot
2020-11-05Cache addressEndpoint.addr.Subnet() to avoid allocations.Bhasker Hariharan
This change adds a Subnet() method to AddressableEndpoint so that we can avoid repeated calls to AddressableEndpoint.AddressWithPrefix().Subnet(). Updates #231 PiperOrigin-RevId: 340969877
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