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2020-03-06Add plumbing for importing fds in VFS2, along with non-socket, non-TTY impl.Dean Deng
In VFS2, imported file descriptors are stored in a kernfs-based filesystem. Upon calling ImportFD, the host fd can be accessed in two ways: 1. a FileDescription that can be added to the FDTable, and 2. a Dentry in the host.filesystem mount, which we will want to access through magic symlinks in /proc/[pid]/fd/. An implementation of the kernfs.Inode interface stores a unique host fd. This inode can be inserted into file descriptions as well as dentries. This change also plumbs in three FileDescriptionImpls corresponding to fds for sockets, TTYs, and other files (only the latter is implemented here). These implementations will mostly make corresponding syscalls to the host. Where possible, the logic is ported over from pkg/sentry/fs/host. Updates #1672 PiperOrigin-RevId: 299417263
2020-03-06Prevent memory leaks in ilistTamir Duberstein
When list elements are removed from a list but not discarded, it becomes important to invalidate the references they hold to their former neighbors to prevent memory leaks. PiperOrigin-RevId: 299412421
2020-03-06Merge pull request #1963 from xiaobo55x:kvm_commongVisor bot
PiperOrigin-RevId: 299405855
2020-03-06Merge pull request #1946 from xiaobo55x:dieTrampgVisor bot
PiperOrigin-RevId: 299405663
2020-03-05Stub oom_score_adj and oom_score.Ian Lewis
Adds an oom_score_adj and oom_score proc file stub. oom_score_adj accepts writes of values -1000 to 1000 and persists the value with the task. New tasks inherit the parent's oom_score_adj. oom_score is a read-only stub that always returns the value '0'. Issue #202 PiperOrigin-RevId: 299245355
2020-03-05Fix S/R on inet.Namespace.Ting-Yu Wang
PiperOrigin-RevId: 299238067
2020-03-05Merge pull request #1951 from moricho:moricho/add-profiler-optiongVisor bot
PiperOrigin-RevId: 299233818
2020-03-03Update cached file size when cache is skippedFabricio Voznika
gofer.dentryReadWriter.WriteFromBlocks was not updating gofer.dentry.size after a write operation that skips the cache. Updates #1198 PiperOrigin-RevId: 298708646
2020-03-03platform/ptrace: don't call probeSeccomp on arm64Andrei Vagin
The support of PTRACE_SYSEMU on arm64 was added in the 5.3 kernel, so we can be sure that the current version is higher that 5.3. And this change moves vsyscall seccomp rules to the arch specific file, because vsyscall isn't supported on arm64. PiperOrigin-RevId: 298696493
2020-03-02Fix panic caused by invalid address for Bind in packet sockets.Nayana Bidari
PiperOrigin-RevId: 298476533
2020-03-02Merge pull request #1885 from avagin:arm64-pcidsgVisor bot
PiperOrigin-RevId: 298405064
2020-03-02socket: take readMu to access readViewAndrei Vagin
DATA RACE in netstack.(*SocketOperations).fetchReadView Write at 0x00c001dca138 by goroutine 1001: gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).fetchReadView() pkg/sentry/socket/netstack/netstack.go:418 +0x85 gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).coalescingRead() pkg/sentry/socket/netstack/netstack.go:2309 +0x67 gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).nonBlockingRead() pkg/sentry/socket/netstack/netstack.go:2378 +0x183d Previous read at 0x00c001dca138 by goroutine 1111: gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).Ioctl() pkg/sentry/socket/netstack/netstack.go:2666 +0x533 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Ioctl() Reported-by: syzbot+d4c3885fcc346f08deb6@syzkaller.appspotmail.com PiperOrigin-RevId: 298387377
2020-03-02Take write lock when removing xattrMichael Pratt
PiperOrigin-RevId: 298380654
2020-02-28Merge pull request #1929 from avagin:arm64-cpuidgVisor bot
PiperOrigin-RevId: 297982488
2020-02-28watchdog: print panic error message before other messagesAndrei Vagin
This is needed for syzkaller to proper classify issues. Right now, all watchdog issues are duped to one with the subject "panic: Sentry detected stuck task(s). See stack trace and message above for more details". PiperOrigin-RevId: 297975363
2020-02-28Define CPUIDInstruction for arm64Andrei Vagin
There is no cpuid instruction on arm64, so we need to defined it just to avoid a compile time error. Signed-off-by: Andrei Vagin <avagin@gmail.com>
2020-02-28pcids.go isn't arch-specificAndrei Vagin
Signed-off-by: Andrei Vagin <avagin@gmail.com>
2020-02-28Make pipe buffer implementation standard.Adin Scannell
A follow-up change will convert the networking code to use this standard pipe implementation. PiperOrigin-RevId: 297903206
2020-02-28Hide /dev/net/tun when using hostinet.Ting-Yu Wang
/dev/net/tun does not currently work with hostinet. This has caused some program starts failing because it thinks the feature exists. PiperOrigin-RevId: 297876196
2020-02-28Change dup2 call to dup3Fabricio Voznika
We changed syscalls to allow dup3 for ARM64. Updates #1198 PiperOrigin-RevId: 297870816
2020-02-27Merge of a369c88c0c4ece5239855000d28df045111c1be7gVisor bot
PiperOrigin-RevId: 297674924
2020-02-27Internal change.Nayana Bidari
PiperOrigin-RevId: 297638665
2020-02-26Fix construct of linux.Stat for arm64.Rahat Mahmood
PiperOrigin-RevId: 297494373
2020-02-26Merge pull request #1912 from lubinszARM:pr_kvm_buildgVisor bot
PiperOrigin-RevId: 297492004
2020-02-26add profile optionmoricho
2020-02-25Add VFS.NewDisconnectedMount().Jamie Liu
Analogous to Linux's kern_mount(). PiperOrigin-RevId: 297259580
2020-02-25Fix DATA RACE in fs.MayDelete.Adin Scannell
MayDelete must lock the directory also, otherwise concurrent renames may race. Note that this also changes the methods to be aligned with the actual Remove and RemoveDirectory methods to minimize confusion when reading the code. (It was hard to see that resolution was correct.) PiperOrigin-RevId: 297258304
2020-02-26Code Clean: Move arch independent codes to common file in kvm pkg.Haibo Xu
Signed-off-by: Haibo Xu <haibo.xu@arm.com> Change-Id: Iefbdf53e8e8d6d23ae75d8a2ff0d2a6e71f414d8
2020-02-25Merge pull request #1271 from lubinszARM:pr_ring0_1gVisor bot
PiperOrigin-RevId: 297230721
2020-02-25Add netlink sockopt logging to strace.Ian Gudger
PiperOrigin-RevId: 297220008
2020-02-25Add option to skip stuck tasks waiting for address spaceFabricio Voznika
PiperOrigin-RevId: 297192390
2020-02-25Merge pull request #1816 from xiaobo55x:trap_flaggVisor bot
PiperOrigin-RevId: 297191168
2020-02-25Port most syscalls to VFS2.Jamie Liu
pipe and pipe2 aren't ported, pending a slight rework of pipe FDs for VFS2. mount and umount2 aren't ported out of temporary laziness. access and faccessat need additional FSImpl methods to implement properly, but are stubbed to prevent googletest from CHECK-failing. Other syscalls require additional plumbing. Updates #1623 PiperOrigin-RevId: 297188448
2020-02-25Fix nested logging.Adin Scannell
PiperOrigin-RevId: 297175316
2020-02-25Don't acquire contended lock with the OS thread locked.Adin Scannell
Fixes #1049 PiperOrigin-RevId: 297175164
2020-02-25Fix mount refcount issue.Adin Scannell
Each mount is holds a reference on a root Dirent, but the mount itself may live beyond it's own reference. This means that a call to Root() can come after the associated reference has been dropped. Instead of introducing a separate layer of references for mount objects, we simply change the Root() method to use TryIncRef() and allow it to return nil if the mount is already gone. This requires updating a small number of callers and minimizes the change (since VFSv2 will replace this code shortly). PiperOrigin-RevId: 297174230
2020-02-25Enable bluepill dieTrampoline operation on arm64.Haibo Xu
Signed-off-by: Haibo Xu <haibo.xu@arm.com> Change-Id: I9e1bf2513c23bdd8c387e5b3c874c6ad3ca9aab0
2020-02-21Implement tap/tun device in vfs.Ting-Yu Wang
PiperOrigin-RevId: 296526279
2020-02-20Initial network namespace support.gVisor bot
TCP/IP will work with netstack networking. hostinet doesn't work, and sockets will have the same behavior as it is now. Before the userspace is able to create device, the default loopback device can be used to test. /proc/net and /sys/net will still be connected to the root network stack; this is the same behavior now. Issue #1833 PiperOrigin-RevId: 296309389
2020-02-20Remove bytes read/written from marshal.Marshallable API.gVisor bot
Users of the API only care about whether the copy in/out succeeds in their entirety, which is already signalled by the returned error. PiperOrigin-RevId: 296297843
2020-02-20Better strace logging for epoll syscalls.gVisor bot
Example: epoll_ctl(0x3 anon_inode:[eventpoll], EPOLL_CTL_ADD, 0x6 anon_inode:[eventfd], 0x7efe2fd92a80 {events=EPOLLIN|EPOLLOUT data=0x10203040506070a}) = 0x0 (4.411µs) epoll_wait(0x3 anon_inode:[eventpoll], 0x7efe2fd92b50 {{events=EPOLLOUT data=0x102030405060708}{events=EPOLLOUT data=0x102030405060708}{events=EPOLLOUT data=0x102030405060708}}, 0x3, 0xffffffff) = 0x3 (29.891µs) PiperOrigin-RevId: 296258146
2020-02-20VFS2: Support memory mapping in tmpfs.gVisor bot
tmpfs.fileDescription now implements ConfigureMMap. And tmpfs.regularFile implement memmap.Mappable. The methods are mostly unchanged from VFS1 tmpfs. PiperOrigin-RevId: 296234557
2020-02-20Lazy-fpsimd support patch series#1: add Arm64-fpsimd support to arch moduleBin Lu
This patch defines the structures and adds the implementations for fpsimd initialization. Signed-off-by: Bin Lu <bin.lu@arm.com>
2020-02-20Code Clean:Move getUserRegisters into dieArchSetup() and other small changes.Bin Lu
Consistent with QEMU, getUserRegisters() should be an arch-specific function. So, it should be called in dieArchSetup(). With this patch and the pagetable/pcid patch, the kvm modules on Arm64 can be built successfully. Signed-off-by: Bin Lu <bin.lu@arm.com>
2020-02-19Internal change.gVisor bot
PiperOrigin-RevId: 296088213
2020-02-18Enable IPV6_RECVTCLASS socket option for datagram socketsgVisor bot
Added the ability to get/set the IP_RECVTCLASS socket option on UDP endpoints. If enabled, traffic class from the incoming Network Header passed as ancillary data in the ControlMessages. Adding Get/SetSockOptBool to decrease the overhead of getting/setting simple options. (This was absorbed in a CL that will be landing before this one). Test: * Added unit test to udp_test.go that tests getting/setting as well as verifying that we receive expected TOS from incoming packet. * Added a syscall test for verifying getting/setting * Removed test skip for existing syscall test to enable end to end test. PiperOrigin-RevId: 295840218
2020-02-18atomicbitops package cleanupsgVisor bot
- Redocument memory ordering from "no ordering" to "acquire-release". (No functional change: both LOCK WHATEVER on x86, and LDAXR/STLXR loops on ARM64, already have this property.) - Remove IncUnlessZeroInt32 and DecUnlessOneInt32, which were only faster than the equivalent loops using sync/atomic before the Go compiler inlined non-unsafe.Pointer atomics many releases ago. PiperOrigin-RevId: 295811743
2020-02-18Merge pull request #1850 from kevinGC:jump2gVisor bot
PiperOrigin-RevId: 295785052
2020-02-18ring0/pagetables: fix typogVisor bot
PiperOrigin-RevId: 295770717
2020-02-14Remove linux.EpollEvent.Fd.gVisor bot
glibc defines struct epoll_event in such a way that epoll_event.data.fd exists. However, the kernel's definition of struct epoll_event makes epoll_event.data an opaque uint64, so naming half of it "fd" just introduces confusion. Remove the Fd field, and make Data a [2]int32 to compensate. Also add required padding to linux.EpollEvent on ARM64. PiperOrigin-RevId: 295250424
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