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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
2019-04-10Fixed /proc/cpuinfo permissionsShiva Prasanth
This also applies these permissions to other static proc files. Change-Id: I4167e585fed49ad271aa4e1f1260babb3239a73d PiperOrigin-RevId: 242898575
2019-04-09Match multi-word StateMichael Pratt
From a recent test failure: "State:\tD (disk sleep)\n" "disk sleep" does not match \w+. We need to allow spaces. PiperOrigin-RevId: 242762469 Change-Id: Ic8d05a16669412a72c1e76b498373e5b22fe64c4
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
2019-04-09runsc: set UID and GID if gofer is executed in a new user namespaceAndrei Vagin
Otherwise, we will not have capabilities in the user namespace. And this patch adds the noexec option for mounts. https://github.com/google/gvisor/issues/145 PiperOrigin-RevId: 242706519 Change-Id: I1b78b77d6969bd18038c71616e8eb7111b71207c
2019-04-09Add TCP checksum verification.Bhasker Hariharan
PiperOrigin-RevId: 242704699 Change-Id: I87db368ca343b3b4bf4f969b17d3aa4ce2f8bd4f
2019-04-09Update README.md to point to gvisor.devAdin Scannell
PiperOrigin-RevId: 242690968 Change-Id: I1ac2248b5ab3bcd95beed52ecddbb9f34eeb3775
2019-04-09Use (*testing.T).Helper to clean up test failuresTamir Duberstein
PiperOrigin-RevId: 242647530 Change-Id: I1bf9ac1d664f452dc47ca670d408a73538cb482f
2019-04-08Internal changeMichael Pratt
PiperOrigin-RevId: 242573252 Change-Id: Ibb4c6bfae2c2e322bf1cec23181a0ab663d8530a
2019-04-08Export kernel.SignalInfoPriv.Jamie Liu
Also add kernel.SignalInfoNoInfo, and use it in RLIMIT_FSIZE checks. PiperOrigin-RevId: 242562428 Change-Id: I4887c0e1c8f5fddcabfe6d4281bf76d2f2eafe90
2019-04-08Add TODOMichael Pratt
PiperOrigin-RevId: 242531141 Change-Id: I2a3bd815bda09f392f511f47120d5d9e6e86a40d
2019-04-08Intermediate ram fs dirs should be writable.Nicolas Lacasse
We construct a ramfs tree of "scaffolding" directories for all mount points, so that a directory exists that each mount point can be mounted over. We were creating these directories without write permissions, which meant that they were not wribable even when underlayed under a writable filesystem. They should be writable. PiperOrigin-RevId: 242507789 Change-Id: I86645e35417560d862442ff5962da211dbe9b731
2019-04-08Bump rules_go to v0.18.2 and go toolchain to v1.12.2.Nicolas Lacasse
PiperOrigin-RevId: 242493066 Change-Id: I2b2b590799d208895c5c16606e4f854dfd112dba
2019-04-05Deflake PtraceTest.SeizeSetOptions.Jamie Liu
PiperOrigin-RevId: 242226319 Change-Id: Iefc78656841315f6b7d48bd85db451486850264d
2019-04-05Use string type for extended attribute values, instead of []byte.Nicolas Lacasse
Strings are a better fit for this usage because they are immutable in Go, and can contain arbitrary bytes. It also allows us to avoid casting bytes to string (and the associated allocation) in the hot path when checking for overlay whiteouts. PiperOrigin-RevId: 242208856 Change-Id: I7699ae6302492eca71787dd0b72e0a5a217a3db2
2019-04-05Make it easier for humans to use RBE, and maintain our bazelrc.Nicolas Lacasse
This CL merges all RBE-specific configuration from .bazelrc_rbe into .bazelrc so that it will be picked up by default by users running bazel. It also checks in a bazelrc from the upstream bazel-toolchains repository, and imports that into our repo-specific .bazelrc. This makes it easier to maintain and update the bazelrc going forward. Documentation was added to the README. PiperOrigin-RevId: 242208733 Change-Id: Iea32de9be85b024bd74f88909b56b2a8ab34851a
2019-04-04Set fixed field in CPUID function 2Michael Pratt
From the SDM: "The least-significant byte in register EAX (register AL) will always return 01H. Software should ignore this value and not interpret it as an informational descriptor." Unfortunately, online docs [1] [2] (likely based on an old version of the SDM) say: "The least-significant byte in register EAX (register AL) indicates the number of times the CPUID instruction must be executed with an input value of 2 to get a complete description of the processor's caches and TLBs." dlang uses this second interpretation [3] and will loop 2^32 times if we return zero. Fix this by specifying the fixed value of one. We still don't support exposing the actual cache information, leaving all other bytes empty. A zero byte means: "Null descriptor, this byte contains no information." [1] http://www.sandpile.org/x86/cpuid.htm#level_0000_0002h [2] https://c9x.me/x86/html/file_module_x86_id_45.html [3] https://github.com/dlang/druntime/blob/424640864c2aa001731467e96f637bd3e704e481/src/core/cpuid.d#L533-L534 PiperOrigin-RevId: 242046629 Change-Id: Ic0f0a5f974b20f71391cb85645bdcd4003e5fe88
2019-04-04gvisor: Add support for the MS_NOEXEC mount optionAndrei Vagin
https://github.com/google/gvisor/issues/145 PiperOrigin-RevId: 242044115 Change-Id: I8f140fe05e32ecd438b6be218e224e4b7fe05878
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
2019-04-04BUILD: Add useful go_path targetAdin Scannell
Change-Id: Ibd6d8a1a63826af6e62a0f0669f8f0866c8091b4 PiperOrigin-RevId: 242037969
2019-04-04Format workspaceAdin Scannell
Change-Id: Ibb77656c46942eb123cd6cff8b471a526468d2dd PiperOrigin-RevId: 242007583
2019-04-03Internal change.Googler
PiperOrigin-RevId: 241867632 Change-Id: I29459f2758ac4835882b491ff25c6aca9a37d41d
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
2019-04-03Don't release d.mu in checks for child-existence.Nicolas Lacasse
Dirent.exists() is called in Create to check whether a child with the given name already exists. Dirent.exists() calls walk(), and before this CL allowed walk() to drop d.mu while calling d.Inode.Lookup. During this existence check, a racing Rename() can acquire d.mu and create a new child of the dirent with the same name. (Note that the source and destination of the rename must be in the same directory, otherwise renameMu will be taken preventing the race.) In this case, d.exists() can return false, even though a child with the same name actually does exist. This CL changes d.exists() so that it does not release d.mu while walking, thus preventing the race with Rename. It also adds comments noting that lockForRename may not take renameMu if the source and destination are in the same directory, as this is a bit surprising (at least it was to me). PiperOrigin-RevId: 241842579 Change-Id: I56524870e39dfcd18cab82054eb3088846c34813
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
2019-04-03Fix index out of bounds in tty implementation.Kevin Krakauer
The previous implementation revolved around runes instead of bytes, which caused weird behavior when converting between the two. For example, peekRune would read the byte 0xff from a buffer, convert it to a rune, then return it. As rune is an alias of int32, 0xff was 0-padded to int32(255), which is the hex code point for ?. However, peekRune also returned the length of the byte (1). When calling utf8.EncodeRune, we only allocated 1 byte, but tried the write the 2-byte character ?. tl;dr: I apparently didn't understand runes when I wrote this. PiperOrigin-RevId: 241789081 Change-Id: I14c788af4d9754973137801500ef6af7ab8a8727
2019-04-03Addresses data race in tty implementation.Kevin Krakauer
Also makes the safemem reading and writing inline, as it makes it easier to see what locks are held. PiperOrigin-RevId: 241775201 Change-Id: Ib1072f246773ef2d08b5b9a042eb7e9e0284175c
2019-04-03Add syscall annotations for unimplemented syscallsIan Lewis
Added syscall annotations for unimplemented syscalls for later generation into reference docs. Annotations are of the form: @Syscall(<name>, <key:value>, ...) Supported args and values are: - arg: A syscall option. This entry only applies to the syscall when given this option. - support: Indicates support level - UNIMPLEMENTED: Unimplemented (implies returns:ENOSYS) - PARTIAL: Partial support. Details should be provided in note. - FULL: Full support - returns: Indicates a known return value. Values are syscall errors. This is treated as a string so you can use something like "returns:EPERM or ENOSYS". - issue: A Github issue number. - note: A note Example: // @Syscall(mmap, arg:MAP_PRIVATE, support:FULL, note:Private memory fully supported) // @Syscall(mmap, arg:MAP_SHARED, support:UNIMPLEMENTED, issue:123, note:Shared memory not supported) // @Syscall(setxattr, returns:ENOTSUP, note:Requires file system support) Annotations should be placed as close to their implementation as possible (preferrably as part of a supporting function's Godoc) and should be updated as syscall support changes. PiperOrigin-RevId: 241697482 Change-Id: I7a846135db124e1271dc5057d788cba82ca312d4
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
2019-04-02Add build rule for raw socket tests so they are runnable via:Kevin Krakauer
bazel test test/syscalls:raw_socket_ipv4_test_{native,runsc_ptrace,runsc_kvm} PiperOrigin-RevId: 241640049 Change-Id: Iac4dbdd7fd1827399a472059ac7d85fb6b506577
2019-04-02Add test that symlinking over a directory returns EEXIST.Nicolas Lacasse
Also remove comments in InodeOperations that required that implementation of some Create* operations ensure that the name does not already exist, since these checks are all centralized in the Dirent. PiperOrigin-RevId: 241637335 Change-Id: Id098dc6063ff7c38347af29d1369075ad1e89a58
2019-04-02Remove obsolete TODO.Kevin Krakauer
PiperOrigin-RevId: 241637164 Change-Id: I65476a739cf38f1818dc47f6ce60638dec8b77a8
2019-04-02Fix more data races in shm debug messages.Rahat Mahmood
PiperOrigin-RevId: 241630409 Change-Id: Ie0df5f5a2f20c2d32e615f16e2ba43c88f963181
2019-04-02device: fix device major/minorWei Zhang
Current gvisor doesn't give devices a right major and minor number. When testing golang supporting of gvisor, I run the test case below: ``` $ docker run -ti --runtime runsc golang:1.12.1 bash -c "cd /usr/local/go/src && ./run.bash " ``` And it reports some errors, one of them is: "--- FAIL: TestDevices (0.00s) --- FAIL: TestDevices//dev/null_1:3 (0.00s) dev_linux_test.go:45: for /dev/null Major(0x0) == 0, want 1 dev_linux_test.go:48: for /dev/null Minor(0x0) == 0, want 3 dev_linux_test.go:51: for /dev/null Mkdev(1, 3) == 0x103, want 0x0 --- FAIL: TestDevices//dev/zero_1:5 (0.00s) dev_linux_test.go:45: for /dev/zero Major(0x0) == 0, want 1 dev_linux_test.go:48: for /dev/zero Minor(0x0) == 0, want 5 dev_linux_test.go:51: for /dev/zero Mkdev(1, 5) == 0x105, want 0x0 --- FAIL: TestDevices//dev/random_1:8 (0.00s) dev_linux_test.go:45: for /dev/random Major(0x0) == 0, want 1 dev_linux_test.go:48: for /dev/random Minor(0x0) == 0, want 8 dev_linux_test.go:51: for /dev/random Mkdev(1, 8) == 0x108, want 0x0 --- FAIL: TestDevices//dev/full_1:7 (0.00s) dev_linux_test.go:45: for /dev/full Major(0x0) == 0, want 1 dev_linux_test.go:48: for /dev/full Minor(0x0) == 0, want 7 dev_linux_test.go:51: for /dev/full Mkdev(1, 7) == 0x107, want 0x0 --- FAIL: TestDevices//dev/urandom_1:9 (0.00s) dev_linux_test.go:45: for /dev/urandom Major(0x0) == 0, want 1 dev_linux_test.go:48: for /dev/urandom Minor(0x0) == 0, want 9 dev_linux_test.go:51: for /dev/urandom Mkdev(1, 9) == 0x109, want 0x0 " So I think we'd better assign to them correct major/minor numbers following linux spec. Signed-off-by: Wei Zhang <zhangwei198900@gmail.com> Change-Id: I4521ee7884b4e214fd3a261929e3b6dac537ada9 PiperOrigin-RevId: 241609021
2019-04-02Change bug number for duplicate bug.Kevin Krakauer
PiperOrigin-RevId: 241567897 Change-Id: I580eac04f52bb15f4aab7df9822c4aa92e743021
2019-04-02Add a raw socket transport endpoint and use it for raw ICMP sockets.Kevin Krakauer
Having raw socket code together will make it easier to add support for other raw network protocols. Currently, only ICMP uses the raw endpoint. However, adding support for other protocols such as UDP shouldn't be much more difficult than adding a few switch cases. PiperOrigin-RevId: 241564875 Change-Id: I77e03adafe4ce0fd29ba2d5dfdc547d2ae8f25bf
2019-04-01Automated rollback of changelist 240657604Fabricio Voznika
PiperOrigin-RevId: 241434161 Change-Id: I9ec734e50cef5b39203e8bf37de2d91d24943f1e
2019-04-01Add release hook and version flagAdin Scannell
PiperOrigin-RevId: 241421671 Change-Id: Ic0cebfe3efd458dc42c49f7f812c13318705199a
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
2019-04-01Trim trailing newline when reading /proc/[pid]/{uid,gid}_map in test.Jamie Liu
This reveals a bug in the tests that require CAP_SET{UID,GID}: After the child process enters the new user namespace, it ceases to have the relevant capability in the parent user namespace, so the privileged write must be done by the parent process. Change tests accordingly. PiperOrigin-RevId: 241412765 Change-Id: I587c1f24aa6f2180fb2e5e5c0162691ba5bac1bc
2019-04-01gofer: ignore unsupported filesLiu Hua
'ls' will hang if there is any FIFO in this path. So return EPERM if unsupported file occurs and add NONBLOCK flag when opening file to avoid blocking on FIFO read. Signed-off-by: Liu Hua <sdu.liu@huawei.com> Change-Id: I8b9a2a48322118d8ad531dd226395438123eb047 PiperOrigin-RevId: 241406726
2019-04-01Don't expand COW-break on executable VMAs.Jamie Liu
PiperOrigin-RevId: 241403847 Change-Id: I4631ca05734142da6e80cdfa1a1d63ed68aa05cc
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
2019-04-01Internal change.Googler
PiperOrigin-RevId: 241350917 Change-Id: Ieacaa9ce2e41e22f1bae8900170879f549606782
2019-04-01Fix MemfdTest_OtherProcessCanOpenFromProcfs.Jamie Liu
- Make the body of InForkedProcess async-signal-safe. - Pass the correct path to open(). PiperOrigin-RevId: 241348774 Change-Id: I753dfa36e4fb05521e659c173e3b7db0c7fc159b
2019-03-29gvisor/runsc: enable generic segmentation offload (GSO)Andrei Vagin
The linux packet socket can handle GSO packets, so we can segment packets to 64K instead of the MTU which is usually 1500. Here are numbers for the nginx-1m test: runsc: 579330.01 [Kbytes/sec] received runsc-gso: 1794121.66 [Kbytes/sec] received runc: 2122139.06 [Kbytes/sec] received and for tcp_benchmark: $ tcp_benchmark --duration 15 --ideal [ 4] 0.0-15.0 sec 86647 MBytes 48456 Mbits/sec $ tcp_benchmark --client --duration 15 --ideal [ 4] 0.0-15.0 sec 2173 MBytes 1214 Mbits/sec $ tcp_benchmark --client --duration 15 --ideal --gso 65536 [ 4] 0.0-15.0 sec 19357 MBytes 10825 Mbits/sec PiperOrigin-RevId: 241072403 Change-Id: I20b03063a1a6649362b43609cbbc9b59be06e6d5
2019-03-29Use kernel.Task.CopyScratchBuffer in syscalls/linux where possible.Jamie Liu
PiperOrigin-RevId: 241072126 Change-Id: Ib4d9f58f550732ac4c5153d3cf159a5b1a9749da
2019-03-29Set container.CreatedAt in Create().Nicolas Lacasse
PiperOrigin-RevId: 241056805 Change-Id: I13ea8f5dbfb01ca02a3b0ab887b8c3bdf4d556a6
2019-03-29Treat fsync errors during save as SaveRejection errors.Nicolas Lacasse
PiperOrigin-RevId: 241055485 Change-Id: I70259e9fef59bdf9733b35a2cd3319359449dd45
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