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2020-08-25Merge release-20200818.0-54-gcb573c8e0 (automated)gVisor bot
2020-08-25Expose basic coverage information to userspace through kcov interface.Dean Deng
In Linux, a kernel configuration is set that compiles the kernel with a custom function that is called at the beginning of every basic block, which updates the memory-mapped coverage information. The Go coverage tool does not allow us to inject arbitrary instructions into basic blocks, but it does provide data that we can convert to a kcov-like format and transfer them to userspace through a memory mapping. Note that this is not a strict implementation of kcov, which is especially tricky to do because we do not have the same coverage tools available in Go that that are available for the actual Linux kernel. In Linux, a kernel configuration is set that compiles the kernel with a custom function that is called at the beginning of every basic block to write program counters to the kcov memory mapping. In Go, however, coverage tools only give us a count of basic blocks as they are executed. Every time we return to userspace, we collect the coverage information and write out PCs for each block that was executed, providing userspace with the illusion that the kcov data is always up to date. For convenience, we also generate a unique synthetic PC for each block instead of using actual PCs. Finally, we do not provide thread-specific coverage data (each kcov instance only contains PCs executed by the thread owning it); instead, we will supply data for any file specified by -- instrumentation_filter. Also, fix issue in nogo that was causing pkg/coverage:coverage_nogo compilation to fail. PiperOrigin-RevId: 328426526
2020-08-25Include shim in individual released binaries.Adin Scannell
The debian rules are also moved to the top-level, since they apply to binaries outside the //runsc directory. Fixes #3665 PiperOrigin-RevId: 328379709
2020-08-22Merge release-20200810.0-90-g17bc5c1b0 (automated)gVisor bot
2020-08-21[vfs] Allow mountpoint to be an existing non-directory.Ayush Ranjan
Unlike linux mount(2), OCI spec allows mounting on top of an existing non-directory file. PiperOrigin-RevId: 327914342
2020-08-21Merge release-20200810.0-83-g5ec3d4ed3 (automated)gVisor bot
2020-08-21Make mounts ReadWrite first, then later change to ReadOnly.Nicolas Lacasse
This lets us create "synthetic" mountpoint directories in ReadOnly mounts during VFS setup. Also add context.WithMountNamespace, as some filesystems (like overlay) require a MountNamespace on ctx to handle vfs.Filesystem Operations. PiperOrigin-RevId: 327874971
2020-08-20Merge release-20200810.0-78-g73c69cb4d (automated)gVisor bot
2020-08-20[vfs] Create recursive dir creation util.Ayush Ranjan
Refactored the recursive dir creation util in runsc/boot/vfs.go to be more flexible. PiperOrigin-RevId: 327719100
2020-08-20Merge release-20200810.0-69-gbe76c7ce6 (automated)gVisor bot
2020-08-19Move boot.Config to its own packageFabricio Voznika
Updates #3494 PiperOrigin-RevId: 327548511
2020-08-20Merge release-20200810.0-68-g633570462 (automated)gVisor bot
2020-08-19Remove path walk from localFile.MknodFabricio Voznika
Replace mknod call with mknodat equivalent to protect against symlink attacks. Also added Mknod tests. Remove goferfs reliance on gofer to check for file existence before creating a synthetic entry. Updates #2923 PiperOrigin-RevId: 327544516
2020-08-18Merge release-20200810.0-51-g760c131da (automated)gVisor bot
2020-08-18Return EROFS if mount is read-onlyFabricio Voznika
PiperOrigin-RevId: 327300635
2020-08-10Merge release-20200804.0-55-g79e7d0b06 (automated)gVisor bot
2020-08-10Run GC before sandbox exit when leak checking is enabled.Dean Deng
Running garbage collection enqueues all finalizers, which are used by the refs/refs_vfs2 packages to detect reference leaks. Note that even with GC, there is no guarantee that all finalizers will be run before the program exits. This is a best effort attempt to activate leak checks as much as possible. Updates #3545. PiperOrigin-RevId: 325834438
2020-08-08Merge release-20200804.0-52-g3be26a271 (automated)gVisor bot
2020-08-07[vfs2] Fix tmpfs mounting.Ayush Ranjan
Earlier we were using NLink to decide if /tmp is empty or not. However, NLink at best tells us about the number of subdirectories (via the ".." entries). NLink = n + 2 for n subdirectories. But it does not tell us if the directory is empty. There still might be non-directory files. We could also not rely on NLink because host overlayfs always returned 1. VFS1 uses Readdir to decide if the directory is empty. Used a similar approach. We now use IterDirents to decide if the "/tmp" directory is empty. Fixes #3369 PiperOrigin-RevId: 325554234
2020-08-06Merge release-20200804.0-29-g63447e5af (automated)gVisor bot
2020-08-06Only register /dev/net/tun if supported.Dean Deng
PiperOrigin-RevId: 325266487
2020-08-05Merge release-20200804.0-19-g190b1e6bd (automated)gVisor bot
2020-08-05Stop profiling when the sentry exitsFabricio Voznika
Also removes `--profile-goroutine` because it's equivalent to `debug --stacks`. PiperOrigin-RevId: 325061502
2020-08-04Merge release-20200622.1-330-g0ba702bd6 (automated)gVisor bot
2020-08-04Error if dup'ing stdio FDs will clobber another FDFabricio Voznika
The loader dup's stdio FD into stable FD's starting at a fixed number. During tests, it's possible that the target FD is already in use. Added check to error early so it's easier to debug failures. Also bumped up the starting FD number to prevent collisions. PiperOrigin-RevId: 324917299
2020-08-03Merge release-20200622.1-313-gb2ae7ea1b (automated)gVisor bot
2020-08-03Plumbing context.Context to DecRef() and Release().Nayana Bidari
context is passed to DecRef() and Release() which is needed for SO_LINGER implementation. PiperOrigin-RevId: 324672584
2020-07-31Merge release-20200622.1-300-ga7d9aa6d5 (automated)gVisor bot
2020-07-30Call lseek(0, SEEK_CUR) unconditionally in runsc fsgofer's Readdir(offset=0).Jamie Liu
9P2000.L is silent as to how readdir RPCs interact with directory mutation. The most performant option is for Treaddir with offset=0 to restart iteration, avoiding needing to walk+open+clunk a new directory fid between invocations of getdents64(2), and the VFS2 gofer client assumes this is the case. Make this actually true for the runsc fsgofer. Fixes #3344, #3345, #3355 PiperOrigin-RevId: 324090384
2020-07-30Implement overlayfs_stale_read for vfs2.Jamie Liu
PiperOrigin-RevId: 324080111
2020-07-28Merge pull request #3102 from stripe:andrew/cgroup-eintrgVisor bot
PiperOrigin-RevId: 323638518
2020-07-27Clean-up bazel wrapper.Adin Scannell
The bazel server was being started as the wrong user, leading to issues where the container would suddenly exit during a build. We can also simplify the waiting logic by starting the container in two separate steps: those that must complete first, then the asynchronous bit. PiperOrigin-RevId: 323391161
2020-07-25Merge release-20200622.1-223-gd6b676ae6 (automated)gVisor bot
2020-07-25test/syscall: run each test case in a separate network namespaceAndrei Vagin
... when it is possible. The guitar gVisorKernel*Workflow-s runs test with the local execution_method. In this case, blaze runs test cases locally without sandboxes. This means that all tests run in the same network namespace. We have a few tests which use hard-coded network ports and they can fail if one of these port will be used by someone else or by another test cases. PiperOrigin-RevId: 323137254
2020-07-25Merge release-20200622.1-220-gbd97206fa (automated)gVisor bot
2020-07-24Reduce walk and open cost in fsgoferFabricio Voznika
Implement WalkGetAttr() to reuse the stat that is already needed for Walk(). In addition, cache file QID, so it doesn't need to stat the file to compute it. open(2) time improved by 10%: Baseline: 6780 ns Change: 6083 ns Also fixed file type which was not being set in all places. PiperOrigin-RevId: 323102560
2020-07-23Merge release-20200622.1-206-g5e34ee68c (automated)gVisor bot
2020-07-23Added stub FUSE filesystemRidwan Sharif
Allow FUSE filesystems to be mounted using libfuse. The appropriate flags and mount options are parsed and understood by fusefs.
2020-07-23Merge release-20200622.1-194-g384369e01 (automated)gVisor bot
2020-07-23Fix fsgofer Open() when control file is using O_PATHFabricio Voznika
Open tries to reuse the control file to save syscalls and file descriptors when opening a file. However, when the control file was opened using O_PATH (e.g. no file permission to open readonly), Open() would not check for it. PiperOrigin-RevId: 322821729
2020-07-22Merge release-20200622.1-184-g71bf90c55 (automated)gVisor bot
2020-07-22Support for receiving outbound packets in AF_PACKET.Bhasker Hariharan
Updates #173 PiperOrigin-RevId: 322665518
2020-07-15Merge release-20200622.1-166-gbdbab2702 (automated)gVisor bot
2020-07-15Merge pull request #3022 from prattmic:runsc_do_pdeathsiggVisor bot
PiperOrigin-RevId: 321449877
2020-07-15Merge release-20200622.1-164-gdb653bb34 (automated)gVisor bot
2020-07-15fdbased: Vectorized write for packet; relax writev syscall filter.Ting-Yu Wang
Now it calls pkt.Data.ToView() when writing the packet. This may require copying when the packet is large, which puts the worse case in an even worse situation. This sent out in a separate preparation change as it requires syscall filter changes. This change will be followed by the change for the adoption of the new PacketHeader API. PiperOrigin-RevId: 321447003
2020-07-15Merge release-20200622.1-160-g8939fae0a (automated)gVisor bot
2020-07-15Apply pdeathsig to gofer for runsc run/doMichael Pratt
Much like the boot process, apply pdeathsig to the gofer for cases where the sandbox lifecycle is attached to the parent (runsc run/do). This isn't strictly necessary, as the gofer normally exits once the sentry disappears, but this makes that extra reliable.
2020-07-15Merge pull request #3165 from ridwanmsharif:ridwanmsharif/fuse-off-by-defaultgVisor bot
PiperOrigin-RevId: 321411758
2020-07-14Merge release-20200622.1-153-g1bfb556cc (automated)gVisor bot
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