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We don't actually support core dumps, but some applications want to
get/set dumpability, which still has an effect in procfs.
Lack of support for set-uid binaries or fs creds simplifies things a
bit.
As-is, processes started via CreateProcess (i.e., init and sentryctl
exec) have normal dumpability. I'm a bit torn on whether sentryctl exec
tasks should be dumpable, but at least since they have no parent normal
UID/GID checks should protect them.
PiperOrigin-RevId: 251712714
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When pipe is created, a dirent of pipe will be
created and its initial reference is set as 0.
Cause all dirent will only be destroyed when
the reference decreased to -1, so there is already
a 'initial reference' of dirent after it created.
For destroying dirent after all reference released,
the correct way is to drop the 'initial reference'
once someone hold a reference to the dirent, such
as fs.NewFile, otherwise the reference of dirent
will stay 0 all the time, and will cause memory
leak of dirent.
Except pipe, timerfd/eventfd/epoll has the same
problem
Here is a simple case to create memory leak of dirent
for pipe/timerfd/eventfd/epoll in C langange, after
run the case, pprof the runsc process, you will
find lots dirents of pipe/timerfd/eventfd/epoll not
freed:
int main(int argc, char *argv[])
{
int i;
int n;
int pipefd[2];
if (argc != 3) {
printf("Usage: %s epoll|timerfd|eventfd|pipe <iterations>\n", argv[0]);
}
n = strtol(argv[2], NULL, 10);
if (strcmp(argv[1], "epoll") == 0) {
for (i = 0; i < n; ++i)
close(epoll_create(1));
} else if (strcmp(argv[1], "timerfd") == 0) {
for (i = 0; i < n; ++i)
close(timerfd_create(CLOCK_REALTIME, 0));
} else if (strcmp(argv[1], "eventfd") == 0) {
for (i = 0; i < n; ++i)
close(eventfd(0, 0));
} else if (strcmp(argv[1], "pipe") == 0) {
for (i = 0; i < n; ++i)
if (pipe(pipefd) == 0) {
close(pipefd[0]);
close(pipefd[1]);
}
}
printf("%s %s test finished\r\n",argv[1],argv[2]);
return 0;
}
Change-Id: Ia1b8a1fb9142edb00c040e44ec644d007f81f5d2
PiperOrigin-RevId: 251531096
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Dirents are ref-counted, but Pipes are not. Holding a Dirent inside of a Pipe
raises difficult questions about the lifecycle of the Pipe and Dirent.
Fortunately, we can side-step those questions by removing the Dirent field from
Pipe entirely. We only need the Dirent when constructing fs.Files (which are
ref-counted), and in GetFile (when a Dirent is passed to us anyways).
PiperOrigin-RevId: 251497628
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After bf959931ddb88c4e4366e96dd22e68fa0db9527c ("wait/ptrace: assume
__WALL if the child is traced") (Linux 4.7), tracees are always eligible
for waiting, regardless of type.
PiperOrigin-RevId: 250399527
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sendfile can be called for a big range and it can require significant
amount of time to process it, so we need to handle task interrupts in
this system call.
PiperOrigin-RevId: 249781023
Change-Id: Ifc2ec505d74c06f5ee76f93b8d30d518ec2d4015
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PiperOrigin-RevId: 249561399
Change-Id: Ic73c68c8538bdca53068f38f82b7260939addac2
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PiperOrigin-RevId: 249537694
Change-Id: Iaa4bca73a2d8341e03064d59a2eb490afc3f80da
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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
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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
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PiperOrigin-RevId: 247667272
Change-Id: I16b04e11bb93f50b7e05e888992303f730e4a877
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Closes #225
PiperOrigin-RevId: 247508791
Change-Id: I04f47cf2770b30043e5a272aba4ba6e11d0476cc
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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
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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
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PiperOrigin-RevId: 245818639
Change-Id: I03703ef0fb9b6675955637b9fe2776204c545789
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PiperOrigin-RevId: 245341004
Change-Id: Ic4d581039d034a8ae944b43e45e84eb2c3973657
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PiperOrigin-RevId: 244773836
Change-Id: I32223f79d2314fe1ac4ddfc63004fc22ff634adf
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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
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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
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PiperOrigin-RevId: 243018347
Change-Id: I1e5b80607c1df0747482abea61db7fcf24536d37
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PiperOrigin-RevId: 242978508
Change-Id: I0ea59ac5ba1dd499e87c53f2e24709371048679b
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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
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PiperOrigin-RevId: 242919489
Change-Id: Ie3267b3bcd8a54b54bc16a6556369a19e843376f
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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
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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
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Also add kernel.SignalInfoNoInfo, and use it in RLIMIT_FSIZE checks.
PiperOrigin-RevId: 242562428
Change-Id: I4887c0e1c8f5fddcabfe6d4281bf76d2f2eafe90
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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
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This will save copies when preemption is not caused by a CPU migration.
PiperOrigin-RevId: 241844399
Change-Id: I2ba3b64aa377846ab763425bd59b61158f576851
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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
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$ 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
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PiperOrigin-RevId: 241630409
Change-Id: Ie0df5f5a2f20c2d32e615f16e2ba43c88f963181
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We weren't saving simple devices' last allocated inode numbers, which
caused inode number reuse across S/R.
PiperOrigin-RevId: 241414245
Change-Id: I964289978841ef0a57d2fa48daf8eab7633c1284
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ilist:generic_list works faster (cl/240185278) and
the code looks cleaner without type casting.
PiperOrigin-RevId: 241381175
Change-Id: I8487ab1d73637b3e9733c253c56dce9e79f0d35f
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PiperOrigin-RevId: 241072126
Change-Id: Ib4d9f58f550732ac4c5153d3cf159a5b1a9749da
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PiperOrigin-RevId: 241055485
Change-Id: I70259e9fef59bdf9733b35a2cd3319359449dd45
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PiperOrigin-RevId: 241028806
Change-Id: I770bf751a2740869a93c3ab50370a727ae580470
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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
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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
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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
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PiperOrigin-RevId: 239803092
Change-Id: I42d612ed6a889e011e8474538958c6de90c6fcab
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A credential object is immutable, so we don't need to copy it for a new
task.
PiperOrigin-RevId: 239519266
Change-Id: I0632f641fdea9554779ac25d84bee4231d0d18f2
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PiperOrigin-RevId: 239016776
Change-Id: Ia7af4258e7c69b16a4630a6f3278aa8e6b627746
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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
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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
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Also added unimplemented notification for semctl(2)
commands.
PiperOrigin-RevId: 236340672
Change-Id: I0795e3bd2e6d41d7936fabb731884df426a42478
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Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: I9751f859332d433ca772d6b9733f5a5a64398ec7
PiperOrigin-RevId: 234877624
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PiperOrigin-RevId: 234690475
Change-Id: I1cbfb5aecd4697a4a26ec8524354aa8656cc3ba1
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- 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
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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
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PiperOrigin-RevId: 232948478
Change-Id: Ib830121e5e79afaf5d38d17aeef5a1ef97913d23
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PiperOrigin-RevId: 232914984
Change-Id: Id2643d7ad8e986ca9be76d860788a71db2674cda
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