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2019-10-01Disable cpuClockTicker when app is idleMichael Pratt
Kernel.cpuClockTicker increments kernel.cpuClock, which tasks use as a clock to track their CPU usage. This improves latency in the syscall path by avoid expensive monotonic clock calls on every syscall entry/exit. However, this timer fires every 10ms. Thus, when all tasks are idle (i.e., blocked or stopped), this forces a sentry wakeup every 10ms, when we may otherwise be able to sleep until the next app-relevant event. These wakeups cause the sentry to utilize approximately 2% CPU when the application is otherwise idle. Updates to clock are not strictly necessary when the app is idle, as there are no readers of cpuClock. This commit reduces idle CPU by disabling the timer when tasks are completely idle, and computing its effects at the next wakeup. Rather than disabling the timer as soon as the app goes idle, we wait until the next tick, which provides a window for short sleeps to sleep and wakeup without doing the (relatively) expensive work of disabling and enabling the timer. PiperOrigin-RevId: 272265822
2019-10-01Honor X bit on extra anon pages in PT_LOAD segmentsMichael Pratt
Linux changed this behavior in 16e72e9b30986ee15f17fbb68189ca842c32af58 (v4.11). Previously, extra pages were always mapped RW. Now, those pages will be executable if the segment specified PF_X. They still must be writeable. PiperOrigin-RevId: 272256280
2019-09-30splice: try another fallback option only if the previous one isn't supportedAndrei Vagin
Reported-by: syzbot+bb5ed342be51d39b0cbb@syzkaller.appspotmail.com PiperOrigin-RevId: 272110815
2019-09-30splice: compare inode numbers only if both ends are pipesAndrei Vagin
It isn't allowed to splice data from and into the same pipe. But right now this check is broken, because we don't check that both ends are pipes. PiperOrigin-RevId: 272107022
2019-09-30Update FIXME bug with GitHub issue.Adin Scannell
PiperOrigin-RevId: 272101930
2019-09-30Force timestamps to update when set via InodeOperations.SetTimestamps.Nicolas Lacasse
The gofer's CachingInodeOperations implementation contains an optimization for the common open-read-close pattern when we have a host FD. In this case, the host kernel will update the timestamp for us to a reasonably close time, so we don't need an extra RPC to the gofer. However, when the app explicitly sets the timestamps (via futimes or similar) then we actually DO need to update the timestamps, because the host kernel won't do it for us. To fix this, a new boolean `forceSetTimestamps` was added to CachineInodeOperations.SetMaskedAttributes. It is only set by gofer.InodeOperations.SetTimestamps. PiperOrigin-RevId: 272048146
2019-09-30Only copy out remaining time on nanosleep successMichael Pratt
It looks like the old code attempted to do this, but didn't realize that err != nil even in the happy case. PiperOrigin-RevId: 272005887
2019-09-27Merge pull request #882 from DarcySail:darcy_faster_CopyStringIngVisor bot
PiperOrigin-RevId: 271675009
2019-09-27Merge pull request #864 from tanjianfeng:fix-861gVisor bot
PiperOrigin-RevId: 271649711
2019-09-27Implement SO_BINDTODEVICE sockoptgVisor bot
PiperOrigin-RevId: 271644926
2019-09-26Make raw socket tests pass in environments with or without CAP_NET_RAW.Kevin Krakauer
PiperOrigin-RevId: 271442321
2019-09-25Merge pull request #863 from tanjianfeng:fix-862gVisor bot
PiperOrigin-RevId: 271168948
2019-09-24gvisor: change syscall.RawSyscall to syscall.RawSyscall6 where requiredgVisor bot
Before https://golang.org/cl/173160 syscall.RawSyscall would zero out the last three register arguments to the system call. That no longer happens. For system calls that take more than three arguments, use RawSyscall6 to ensure that we pass zero, not random data, for the additional arguments. PiperOrigin-RevId: 271062527
2019-09-24Stub out readahead implementation.Adin Scannell
Closes #261 PiperOrigin-RevId: 270973347
2019-09-24tty: fix sending SIGTTOU on tty writehenry.tjf
How to reproduce: $ echo "timeout 10 ls" > foo.sh $ chmod +x foo.sh $ ./foo.sh (will hang here for 10 secs, and the output of ls does not show) When "ls" process writes to stdout, it receives SIGTTOU signal, and hangs there. Until "timeout" process timeouts, and kills "ls" process. The expected result is: "ls" writes its output into tty, and terminates immdedately, then "timeout" process receives SIGCHLD and terminates. The reason for this failure is that we missed the check for TOSTOP (if set, background processes will receive the SIGTTOU signal when they do write). We use drivers/tty/n_tty.c:n_tty_write() as a reference. Fixes: #862 Reported-by: chris.zn <chris.zn@antfin.com> Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com> Signed-off-by: chenglang.hy <chenglang.hy@antfin.com>
2019-09-23netstack: convert more socket options to {Set,Get}SockOptIntAndrei Vagin
PiperOrigin-RevId: 270763208
2019-09-23internal BUILD file cleanup.gVisor bot
PiperOrigin-RevId: 270680704
2019-09-20Change vfs.Dirent.Off to NextOff.Jamie Liu
"d_off is the distance from the start of the directory to the start of the next linux_dirent." - getdents(2). PiperOrigin-RevId: 270349685
2019-09-20fix set hostnameJianfeng Tan
Previously, when we set hostname: $ strace hostname abc ... sethostname("abc", 3) = -1 ENAMETOOLONG (File name too long) ... According to man 2 sethostname: "The len argument specifies the number of bytes in name. (Thus, name does not require a terminating null byte.)" We wrongly use the CopyStringIn() to check terminating zero byte in the implementation of sethostname syscall. To fix this, we use CopyInBytes() instead. Fixes: #861 Reported-by: chenglang.hy <chenglang.hy@antfin.com> Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com>
2019-09-19Remove defer from hot path and ensure Atomic is applied consistently.Adin Scannell
PiperOrigin-RevId: 270114317
2019-09-19Merge pull request #876 from xiaobo55x:hostcpugVisor bot
PiperOrigin-RevId: 270094324
2019-09-19Job control: controlling TTYs and foreground process groups.Kevin Krakauer
Adresses a deadlock with the rolled back change: https://github.com/google/gvisor/commit/b6a5b950d28e0b474fdad160b88bc15314cf9259 Creating a session from an orphaned process group was causing a lock to be acquired twice by a single goroutine. This behavior is addressed, and a test (OrphanRegression) has been added to pty.cc. Implemented the following ioctls: - TIOCSCTTY - set controlling TTY - TIOCNOTTY - remove controlling tty, maybe signal some other processes - TIOCGPGRP - get foreground process group. Also enables tcgetpgrp(). - TIOCSPGRP - set foreground process group. Also enabled tcsetpgrp(). Next steps are to actually turn terminal-generated control characters (e.g. C^c) into signals to the proper process groups, and to send SIGTTOU and SIGTTIN when appropriate. PiperOrigin-RevId: 270088599
2019-09-19Accelerate byte lookup in string with `bytealg/indexbyte`Hang Su
`bytealg/indexbyte` will use AVX or SSE instruction set, if possible, which could accelerate `CopyStringIn` function by 28%. In worst case(CPU doesn't support SSE), `bytealg/indexbyte` will degenerate to traversal lookup. When dealing with short strings, `bytealg/indexbyte` has the same performance level as before. Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com> Signed-off-by: Hang Su <darcy.sh@antfin.com>
2019-09-18Enable pkg/sentry/hostcpu support on arm64.Haibo Xu
Signed-off-by: Haibo Xu haibo.xu@arm.com Change-Id: I333872da9bdf56ddfa8ab2f034dfc1f36a7d3132
2019-09-18Signalfd supportAdin Scannell
Note that the exact semantics for these signalfds are slightly different from Linux. These signalfds are bound to the process at creation time. Reads, polls, etc. are all associated with signals directed at that task. In Linux, all signalfd operations are associated with current, regardless of where the signalfd originated. In practice, this should not be an issue given how signalfds are used. In order to fix this however, we will need to plumb the context through all the event APIs. This gets complicated really quickly, because the waiter APIs are all netstack-specific, and not generally exposed to the context. Probably not worthwhile fixing immediately. PiperOrigin-RevId: 269901749
2019-09-17platform/ptrace: log exit code for stub processesAndrei Vagin
PiperOrigin-RevId: 269631877
2019-09-13gvisor: return ENOTDIR from the unlink syscallAndrei Vagin
ENOTDIR has to be returned when a component used as a directory in pathname is not, in fact, a directory. PiperOrigin-RevId: 269037893
2019-09-12Implement splice methods for pipes and sockets.Adin Scannell
This also allows the tee(2) implementation to be enabled, since dup can now be properly supported via WriteTo. Note that this change necessitated some minor restructoring with the fs.FileOperations splice methods. If the *fs.File is passed through directly, then only public API methods are accessible, which will deadlock immediately since the locking is already done by fs.Splice. Instead, we pass through an abstract io.Reader or io.Writer, which elide locks and use the underlying fs.FileOperations directly. PiperOrigin-RevId: 268805207
2019-09-12Remove go_test from go_stateify and go_marshalMichael Pratt
They are no-ops, so the standard rule works fine. PiperOrigin-RevId: 268776264
2019-09-09go_marshal: Implement automatic generation of ABI marshalling code.Rahat Mahmood
This CL implements go_marshal, a code generation utility for automatically serializing and deserializing ABI structs. The go_marshal tool automatically generates implementations of the new marshal interface. Unlike binary.Marshal/Unmarshal, the generated interface implementations use no runtime reflection, and translates to a single memcpy for most structs. See go_marshal/README.md for details. PiperOrigin-RevId: 268065475
2019-09-05Better strace logs for statx.Nicolas Lacasse
PiperOrigin-RevId: 267498537
2019-09-03Impose order on test scripts.Adin Scannell
The simple test script has gotten out of control. Shard this script into different pieces and attempt to impose order on overall test structure. This change helps lay some of the foundations for future improvements. * The runsc/test directories are moved into just test/. * The runsc/test/testutil package is split into logical pieces. * The scripts/ directory contains new top-level targets. * Each test is now responsible for building targets it requires. * The install functionality is moved into `runsc` itself for simplicity. * The existing kokoro run_tests.sh file now just calls all (can be split). After this change is merged, I will create multiple distinct workflows for Kokoro, one for each of the scripts currently targeted by `run_tests.sh` today, which should dramatically reduce the time-to-run for the Kokoro tests, and provides a better foundation for further improvements to the infrastructure. PiperOrigin-RevId: 267081397
2019-08-30Remove support for non-incremental mapped accounting.Jamie Liu
PiperOrigin-RevId: 266496644
2019-08-30Automated rollback of changelist 261387276Bhasker Hariharan
PiperOrigin-RevId: 266491264
2019-08-30Return correct buffer size for ioctl(socket, FIONREAD)Fabricio Voznika
Ioctl was returning just the buffer size from epsocket.endpoint and it was not considering data from epsocket.SocketOperations that was read from the endpoint, but not yet sent to the caller. PiperOrigin-RevId: 266485461
2019-08-29Implement /proc/net/udp.Rahat Mahmood
PiperOrigin-RevId: 266229756
2019-08-29Add limit_host_fd_translation Gofer mount option.Jamie Liu
PiperOrigin-RevId: 266177409
2019-08-27Fix comment typoMichael Pratt
PiperOrigin-RevId: 265731735
2019-08-27Fix sendfile(2) error codeFabricio Voznika
When output file is in append mode, sendfile(2) should fail with EINVAL and not EBADF. Closes #721 PiperOrigin-RevId: 265718958
2019-08-27Mount volumes as super userFabricio Voznika
This used to be the case, but regressed after a recent change. Also made a few fixes around it and clean up the code a bit. Closes #720 PiperOrigin-RevId: 265717496
2019-08-22Ensure yield-equivalent with an already-expired timeout.Adin Scannell
PiperOrigin-RevId: 264920977
2019-08-21Use tcpip.Subnet in tcpip.RouteTamir Duberstein
This is the first step in replacing some of the redundant types with the standard library equivalents. PiperOrigin-RevId: 264706552
2019-08-19Document RWF_HIPRI not implemented for preadv2/pwritev2.Zach Koopmans
Document limitation of no reasonable implementation for RWF_HIPRI flag (High Priority Read/Write for block-based file systems). PiperOrigin-RevId: 264237589
2019-08-19hostinet: fix parsing route netlink messageJianfeng Tan
We wrongly parses output interface as gateway address. The fix is straightforward. Fixes #638 Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com> Change-Id: Ia4bab31f3c238b0278ea57ab22590fad00eaf061 COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/684 from tanjianfeng:fix-638 b940e810367ad1273519bfa594f4371bdd293e83 PiperOrigin-RevId: 264211336
2019-08-19Read iptables via sockopts.Kevin Krakauer
PiperOrigin-RevId: 264180125
2019-08-16netstack: disconnect an unix socket only if the address family is AF_UNSPECAndrei Vagin
Linux allows to call connect for ANY and the zero port. PiperOrigin-RevId: 263892534
2019-08-16procfs: Migrate seqfile implementations.Ayush Ranjan
Migrates all (except 3) seqfile implementations to the vfs.DynamicBytesSource interface. There should not be any change in functionality due to this migration itself. Please note that the following seqfile implementations have not been migrated: - /proc/filesystems in proc/filesystems.go - /proc/[pid]/mountinfo in proc/mounts.go - /proc/[pid]/mounts in proc/mounts.go This is because these depend on pending changes in /pkg/senty/vfs. PiperOrigin-RevId: 263880719
2019-08-16ptrace: detect if a stub process exited unexpectedlyAndrei Vagin
PiperOrigin-RevId: 263880577
2019-08-16vfs: Remove vfs.DefaultDirectoryFD from embedding vfs.DefaultFD.Ayush Ranjan
This fixes the implementation ambiguity issues when a filesystem implementation embeds vfs.DefaultDirectoryFD to its directory FD along with an internal common fileDescription utility. For similar reasons also removes FileDescriptionDefaultImpl from DynamicBytesFileDescriptionImpl. PiperOrigin-RevId: 263795513
2019-08-14Replace uinptr with int64 when returning lengthsTamir Duberstein
This is in accordance with newer parts of the standard library. PiperOrigin-RevId: 263449916
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