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2019-05-22Add support for wait(WNOTHREAD)Michael Pratt
PiperOrigin-RevId: 249537694 Change-Id: Iaa4bca73a2d8341e03064d59a2eb490afc3f80da
2019-05-21Clean up pipe internals and add fcntl supportAdin Scannell
Pipe internals are made more efficient by avoiding garbage collection. A pool is now used that can be shared by all pipes, and buffers are chained via an intrusive list. The documentation for pipe structures and methods is also simplified and clarified. The pipe tests are now parameterized, so that they are run on all different variants (named pipes, small buffers, default buffers). The pipe buffer sizes are exposed by fcntl, which is now supported by this change. A size change test has been added to the suite. These new tests uncovered a bug regarding the semantics of open named pipes with O_NONBLOCK, which is also fixed by this CL. This fix also addresses the lack of the O_LARGEFILE flag for named pipes. PiperOrigin-RevId: 249375888 Change-Id: I48e61e9c868aedb0cadda2dff33f09a560dee773
2019-05-21Add basic plumbing for splice and stub implementation.Adin Scannell
This does not actually implement an efficient splice or sendfile. Rather, it adds a generic plumbing to the file internals so that this can be added. All file implementations use the stub fileutil.NoSplice implementation, which causes sendfile and splice to fall back to an internal copy. A basic splice system call interface is added, along with a test. PiperOrigin-RevId: 249335960 Change-Id: Ic5568be2af0a505c19e7aec66d5af2480ab0939b
2019-05-10Add pgalloc.DelayedEvictionManual.Jamie Liu
PiperOrigin-RevId: 247667272 Change-Id: I16b04e11bb93f50b7e05e888992303f730e4a877
2019-05-09Implement fallocate(2)Fabricio Voznika
Closes #225 PiperOrigin-RevId: 247508791 Change-Id: I04f47cf2770b30043e5a272aba4ba6e11d0476cc
2019-04-30Implement async MemoryFile eviction, and use it in CachingInodeOperations.Jamie Liu
This feature allows MemoryFile to delay eviction of "optional" allocations, such as unused cached file pages. Note that this incidentally makes CachingInodeOperations writeback asynchronous, in the sense that it doesn't occur until eviction; this is necessary because between when a cached page becomes evictable and when it's evicted, file writes (via CachingInodeOperations.Write) may dirty the page. As currently implemented, this feature won't meaningfully impact steady-state memory usage or caching; the reclaimer goroutine will schedule eviction as soon as it runs out of other work to do. Future CLs increase caching by adding constraints on when eviction is scheduled. PiperOrigin-RevId: 246014822 Change-Id: Ia85feb25a2de92a48359eb84434b6ec6f9bea2cb
2019-04-29Change copyright notice to "The gVisor Authors"Michael Pratt
Based on the guidelines at https://opensource.google.com/docs/releasing/authors/. 1. $ rg -l "Google LLC" | xargs sed -i 's/Google LLC.*/The gVisor Authors./' 2. Manual fixup of "Google Inc" references. 3. Add AUTHORS file. Authors may request to be added to this file. 4. Point netstack AUTHORS to gVisor AUTHORS. Drop CONTRIBUTORS. Fixes #209 PiperOrigin-RevId: 245823212 Change-Id: I64530b24ad021a7d683137459cafc510f5ee1de9
2019-04-29Allow and document bug ids in gVisor codebase.Nicolas Lacasse
PiperOrigin-RevId: 245818639 Change-Id: I03703ef0fb9b6675955637b9fe2776204c545789
2019-04-25Perform explicit CPUID and FP state compatibility checks on restoreMichael Pratt
PiperOrigin-RevId: 245341004 Change-Id: Ic4d581039d034a8ae944b43e45e84eb2c3973657
2019-04-22Clean up state error handlingMichael Pratt
PiperOrigin-RevId: 244773836 Change-Id: I32223f79d2314fe1ac4ddfc63004fc22ff634adf
2019-04-17Don't allow sigtimedwait to catch unblockable signalsMichael Pratt
The existing logic attempting to do this is incorrect. Unary ^ has higher precedence than &^, so mask always has UnblockableSignals cleared, allowing dequeueSignalLocked to dequeue unblockable signals (which allows userspace to ignore them). Switch the logic so that unblockable signals are always masked. PiperOrigin-RevId: 244058487 Change-Id: Ib19630ac04068a1fbfb9dc4a8eab1ccbdb21edc3
2019-04-17Use FD limit and file size limit from hostFabricio Voznika
FD limit and file size limit is read from the host, instead of using hard-coded defaults, given that they effect the sandbox process. Also limit the direct cache to use no more than half if the available FDs. PiperOrigin-RevId: 244050323 Change-Id: I787ad0fdf07c49d589e51aebfeae477324fe26e6
2019-04-11Use open fids when fstat()ing gofer files.Jamie Liu
PiperOrigin-RevId: 243018347 Change-Id: I1e5b80607c1df0747482abea61db7fcf24536d37
2019-04-10Internal changeMichael Pratt
PiperOrigin-RevId: 242978508 Change-Id: I0ea59ac5ba1dd499e87c53f2e24709371048679b
2019-04-10Fix uses of RootFromContext.Nicolas Lacasse
RootFromContext can return a dirent with reference taken, or nil. We must call DecRef if (and only if) a real dirent is returned. PiperOrigin-RevId: 242965515 Change-Id: Ie2b7b4cb19ee09b6ccf788b71f3fd7efcdf35a11
2019-04-10Allow threads with CAP_SYS_RESOURCE to raise hard rlimits.Kevin Krakauer
PiperOrigin-RevId: 242919489 Change-Id: Ie3267b3bcd8a54b54bc16a6556369a19e843376f
2019-04-10Start saving MountSource.DirentCache.Nicolas Lacasse
DirentCache is already a savable type, and it ensures that it is empty at the point of Save. There is no reason not to save it along with the MountSource. This did uncover an issue where not all MountSources were properly flushed before Save. If a mount point has an open file and is then unmounted, we save the MountSource without flushing it first. This CL also fixes that by flushing all MountSources for all open FDs on Save. PiperOrigin-RevId: 242906637 Change-Id: I3acd9d52b6ce6b8c989f835a408016cb3e67018f
2019-04-09syscalls: sendfile: limit the count to MAX_RW_COUNTLi Qiang
From sendfile spec and also the linux kernel code, we should limit the count arg to 'MAX_RW_COUNT'. This patch export 'MAX_RW_COUNT' in kernel pkg and use it in the implementation of sendfile syscall. Signed-off-by: Li Qiang <pangpei.lq@antfin.com> Change-Id: I1086fec0685587116984555abd22b07ac233fbd2 PiperOrigin-RevId: 242745831
2019-04-08Export kernel.SignalInfoPriv.Jamie Liu
Also add kernel.SignalInfoNoInfo, and use it in RLIMIT_FSIZE checks. PiperOrigin-RevId: 242562428 Change-Id: I4887c0e1c8f5fddcabfe6d4281bf76d2f2eafe90
2019-04-04Remove defer from trivial ThreadID methodsMichael Pratt
In particular, ns.IDOfTask and tg.ID are used for gettid and getpid, respectively, where removing defer saves ~100ns. This may be a small improvement to application logging, which may call gettid/getpid frequently. PiperOrigin-RevId: 242039616 Change-Id: I860beb62db3fe077519835e6bafa7c74cba6ca80
2019-04-03Only CopyOut CPU when it changesMichael Pratt
This will save copies when preemption is not caused by a CPU migration. PiperOrigin-RevId: 241844399 Change-Id: I2ba3b64aa377846ab763425bd59b61158f576851
2019-04-03Cache ThreadGroups in PIDNamespaceMichael Pratt
If there are thousands of threads, ThreadGroupsAppend becomes very expensive as it must iterate over all Tasks to find the ThreadGroup leaders. Reduce the cost by maintaining a map of ThreadGroups which can be used to grab them all directly. The one somewhat visible change is to convert PID namespace init children zapping to a group-directed SIGKILL, as Linux did in 82058d668465 "signal: Use group_send_sig_info to kill all processes in a pid namespace". In a benchmark that creates N threads which sleep for two minutes, we see approximately this much CPU time in ThreadGroupsAppend: Before: 1 thread: 0ms 1024 threads: 30ms - 9130ms 4096 threads: 50ms - 2000ms 8192 threads: 18160ms 16384 threads: 17210ms After: 1 thread: 0ms 1024 threads: 0ms 4096 threads: 0ms 8192 threads: 0ms 16384 threads: 0ms The profiling is actually extremely noisy (likely due to cache effects), as some runs show almost no samples at 1024, 4096 threads, but obviously this does not scale to lots of threads. PiperOrigin-RevId: 241828039 Change-Id: I17827c90045df4b3c49b3174f3a05bca3026a72c
2019-04-02Set options on the correct Task in PTRACE_SEIZE.Jamie Liu
$ docker run --rm --runtime=runsc -it --cap-add=SYS_PTRACE debian bash -c "apt-get update && apt-get install strace && strace ls" ... Setting up strace (4.15-2) ... execve("/bin/ls", ["ls"], [/* 6 vars */]) = 0 brk(NULL) = 0x5646d8c1e000 uname({sysname="Linux", nodename="114ef93d2db3", ...}) = 0 ... PiperOrigin-RevId: 241643321 Change-Id: Ie4bce27a7fb147eef07bbae5895c6ef3f529e177
2019-04-02Fix more data races in shm debug messages.Rahat Mahmood
PiperOrigin-RevId: 241630409 Change-Id: Ie0df5f5a2f20c2d32e615f16e2ba43c88f963181
2019-04-01Save/restore simple devices.Rahat Mahmood
We weren't saving simple devices' last allocated inode numbers, which caused inode number reuse across S/R. PiperOrigin-RevId: 241414245 Change-Id: I964289978841ef0a57d2fa48daf8eab7633c1284
2019-04-01gvisor: convert ilist to ilist:generic_listAndrei Vagin
ilist:generic_list works faster (cl/240185278) and the code looks cleaner without type casting. PiperOrigin-RevId: 241381175 Change-Id: I8487ab1d73637b3e9733c253c56dce9e79f0d35f
2019-03-29Use kernel.Task.CopyScratchBuffer in syscalls/linux where possible.Jamie Liu
PiperOrigin-RevId: 241072126 Change-Id: Ib4d9f58f550732ac4c5153d3cf159a5b1a9749da
2019-03-29Treat fsync errors during save as SaveRejection errors.Nicolas Lacasse
PiperOrigin-RevId: 241055485 Change-Id: I70259e9fef59bdf9733b35a2cd3319359449dd45
2019-03-29Treat ENOSPC as a state-file error during save.Nicolas Lacasse
PiperOrigin-RevId: 241028806 Change-Id: I770bf751a2740869a93c3ab50370a727ae580470
2019-03-28set task's name when forkchris.zn
When fork a child process, the name filed of TaskContext is not set. It results in that when we cat /proc/{pid}/status, the name filed is null. Like this: Name: State: S (sleeping) Tgid: 28 Pid: 28 PPid: 26 TracerPid: 0 FDSize: 8 VmSize: 89712 kB VmRSS: 6648 kB Threads: 1 CapInh: 00000000a93d35fb CapPrm: 0000000000000000 CapEff: 0000000000000000 CapBnd: 00000000a93d35fb Seccomp: 0 Change-Id: I5d469098c37cedd19da16b7ffab2e546a28a321e PiperOrigin-RevId: 240893304
2019-03-25Call memmap.Mappable.Translate with more conservative usermem.AccessType.Jamie Liu
MM.insertPMAsLocked() passes vma.maxPerms to memmap.Mappable.Translate (although it unsets AccessType.Write if the vma is private). This somewhat simplifies handling of pmas, since it means only COW-break needs to replace existing pmas. However, it also means that a MAP_SHARED mapping of a file opened O_RDWR dirties the file, regardless of the mapping's permissions and whether or not the mapping is ever actually written to with I/O that ignores permissions (e.g. ptrace(PTRACE_POKEDATA)). To fix this: - Change the pma-getting path to request only the permissions that are required for the calling access. - Change memmap.Mappable.Translate to take requested permissions, and return allowed permissions. This preserves the existing behavior in the common cases where the memmap.Mappable isn't fsutil.CachingInodeOperations and doesn't care if the translated platform.File pages are written to. - Change the MM.getPMAsLocked path to support permission upgrading of pmas outside of copy-on-write. PiperOrigin-RevId: 240196979 Change-Id: Ie0147c62c1fbc409467a6fa16269a413f3d7d571
2019-03-25epoll: use ilist:generic_list instead of ilist:ilistAndrei Vagin
ilist:generic_list works faster than ilist:ilist. Here is a beanchmark test to measure performance of epoll_wait, when readyList isn't empty. It shows about 30% better performance with these changes. Benchmark Time(ns) CPU(ns) Iterations Before: BM_EpollAllEvents 46725 46899 14286 After: BM_EpollAllEvents 33167 33300 18919 PiperOrigin-RevId: 240185278 Change-Id: I3e33f9b214db13ab840b91613400525de5b58d18
2019-03-22Implement PTRACE_SEIZE, PTRACE_INTERRUPT, and PTRACE_LISTEN.Jamie Liu
PiperOrigin-RevId: 239803092 Change-Id: I42d612ed6a889e011e8474538958c6de90c6fcab
2019-03-20gvisor: don't allocate a new credential object on forkAndrei Vagin
A credential object is immutable, so we don't need to copy it for a new task. PiperOrigin-RevId: 239519266 Change-Id: I0632f641fdea9554779ac25d84bee4231d0d18f2
2019-03-18Remove racy access to shm fields.Rahat Mahmood
PiperOrigin-RevId: 239016776 Change-Id: Ia7af4258e7c69b16a4630a6f3278aa8e6b627746
2019-03-14Decouple filemem from platform and move it to pgalloc.MemoryFile.Jamie Liu
This is in preparation for improved page cache reclaim, which requires greater integration between the page cache and page allocator. PiperOrigin-RevId: 238444706 Change-Id: Id24141b3678d96c7d7dc24baddd9be555bffafe4
2019-03-05Priority-inheritance futex implementationFabricio Voznika
It is Implemented without the priority inheritance part given that gVisor defers scheduling decisions to Go runtime and doesn't have control over it. PiperOrigin-RevId: 236989545 Change-Id: I714c8ca0798743ecf3167b14ffeb5cd834302560
2019-03-01Add semctl(GETPID) syscallFabricio Voznika
Also added unimplemented notification for semctl(2) commands. PiperOrigin-RevId: 236340672 Change-Id: I0795e3bd2e6d41d7936fabb731884df426a42478
2019-02-20Make some ptrace commands x86-onlyHaibo Xu
Signed-off-by: Haibo Xu <haibo.xu@arm.com> Change-Id: I9751f859332d433ca772d6b9733f5a5a64398ec7 PiperOrigin-RevId: 234877624
2019-02-19Set rax to syscall number on SECCOMP_RET_TRAP.Jamie Liu
PiperOrigin-RevId: 234690475 Change-Id: I1cbfb5aecd4697a4a26ec8524354aa8656cc3ba1
2019-02-19Fix clone(CLONE_NEWUSER).Jamie Liu
- Use new user namespace for namespace creation checks. - Ensure userns is never nil since it's used by other namespaces. PiperOrigin-RevId: 234673175 Change-Id: I4b9d9d1e63ce4e24362089793961a996f7540cd9
2019-02-14Don't allow writing or reading to TTY unless process group is in foreground.Nicolas Lacasse
If a background process tries to read from a TTY, linux sends it a SIGTTIN unless the signal is blocked or ignored, or the process group is an orphan, in which case the syscall returns EIO. See drivers/tty/n_tty.c:n_tty_read()=>job_control(). If a background process tries to write a TTY, set the termios, or set the foreground process group, linux then sends a SIGTTOU. If the signal is ignored or blocked, linux allows the write. If the process group is an orphan, the syscall returns EIO. See drivers/tty/tty_io.c:tty_check_change(). PiperOrigin-RevId: 234044367 Change-Id: I009461352ac4f3f11c5d42c43ac36bb0caa580f9
2019-02-07Implement /proc/net/unix.Rahat Mahmood
PiperOrigin-RevId: 232948478 Change-Id: Ib830121e5e79afaf5d38d17aeef5a1ef97913d23
2019-02-07Implement semctl(2) SETALL and GETALLFabricio Voznika
PiperOrigin-RevId: 232914984 Change-Id: Id2643d7ad8e986ca9be76d860788a71db2674cda
2019-01-31Move package sync to third_partyMichael Pratt
PiperOrigin-RevId: 231889261 Change-Id: I482f1df055bcedf4edb9fe3fe9b8e9c80085f1a0
2019-01-31Remove license commentsMichael Pratt
Nothing reads them and they can simply get stale. Generated with: $ sed -i "s/licenses(\(.*\)).*/licenses(\1)/" **/BUILD PiperOrigin-RevId: 231818945 Change-Id: Ibc3f9838546b7e94f13f217060d31f4ada9d4bf0
2019-01-14Remove fs.Handle, ramfs.Entry, and all the DeprecatedFileOperations.Nicolas Lacasse
More helper structs have been added to the fsutil package to make it easier to implement fs.InodeOperations and fs.FileOperations. PiperOrigin-RevId: 229305982 Change-Id: Ib6f8d3862f4216745116857913dbfa351530223b
2019-01-09Minor memevent fixes.Jamie Liu
- Call MemoryEvents.done.Add(1) outside of MemoryEvents.run() so that if MemoryEvents.Stop() => MemoryEvents.done.Wait() is called before the goroutine starts running, it still waits for the goroutine to stop. - Use defer to call MemoryEvents.done.Done() in MemoryEvents.run() so that it's called even if the goroutine panics. PiperOrigin-RevId: 228623307 Change-Id: I1b0459e7999606c1a1a271b16092b1ca87005015
2019-01-08Improve loader related error messages returned to users.Brian Geffon
PiperOrigin-RevId: 228382827 Change-Id: Ica1d30e0df826bdd77f180a5092b2b735ea5c804
2019-01-08Grant no initial capabilities to non-root UIDs.Jamie Liu
See modified comment in auth.NewUserCredentials(); compare to the behavior of setresuid(2) as implemented by //pkg/sentry/kernel/task_identity.go:kernel.Task.setKUIDsUncheckedLocked(). PiperOrigin-RevId: 228381765 Change-Id: I45238777c8f63fcf41b99fce3969caaf682fe408
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