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This is required to make the shutdown visible to peers outside the
sandbox.
The readClosed / writeClosed fields were dropped, as they were
preventing a shutdown socket from reading the remainder of queued bytes.
The host syscalls will return the appropriate errors for shutdown.
The control message tests have been split out of socket_unix.cc to make
the (few) remaining tests accessible to testing inherited host UDS,
which don't support sending control messages.
Updates #273
PiperOrigin-RevId: 251763060
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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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and don't report a sender address if it doesn't have one
PiperOrigin-RevId: 251371284
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The io.Writer contract requires that Write writes all available
bytes and does not return short writes. This causes errors with
io.Copy, since our own Write interface does not have this same
contract.
PiperOrigin-RevId: 251368730
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There is no reason to do the recursion manually, since
Inode.BoundEndpoint will do it for us.
PiperOrigin-RevId: 250794903
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VmData is the size of private data segments.
It has the same meaning as in Linux.
Change-Id: Iebf1ae85940a810524a6cde9c2e767d4233ddb2a
PiperOrigin-RevId: 250593739
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The original bug is no longer relevant, and the FIXME here
contains lots of obsolete information.
PiperOrigin-RevId: 249924036
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We don't need to model internal interfaces after the system
call interfaces (which are objectively worse and simply use a
flag to distinguish between two logically different operations).
PiperOrigin-RevId: 249916814
Change-Id: I45d02e0ec0be66b782a685b1f305ea027694cab9
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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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Initialized BUILD with license
Mount is still unimplemented and is not meant to be
part of this CL. Rest of the fs interface is implemented.
Referenced the Linux kernel appropriately when needed
PiperOrigin-RevId: 249741997
Change-Id: Id1e4c7c9e68b3f6946da39896fc6a0c3dcd7f98c
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Separate MountSource from Mount. This is needed to allow
mounts to be shared by multiple containers within the same
pod.
PiperOrigin-RevId: 249617810
Change-Id: Id2944feb7e4194951f355cbe6d4944ae3c02e468
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There no obvious reason to require that BlockSize and StatFS
are MountSource operations. Today they are in INodeOperations,
and they can be moved elsewhere in the future as part of a
normal refactor process.
PiperOrigin-RevId: 249549982
Change-Id: Ib832e02faeaf8253674475df4e385bcc53d780f3
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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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Remove unused struct member.
PiperOrigin-RevId: 249300446
Change-Id: Ifb16538f684bc3200342462c3da927eb564bf52d
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The backing 9p server must allow named pipe creation, which the runsc
fsgofer currently does not.
There are small changes to the overlay here. GetFile may block when
opening a named pipe, which can cause a deadlock:
1. open(O_RDONLY) -> copyMu.Lock() -> GetFile()
2. open(O_WRONLY) -> copyMu.Lock() -> Deadlock
A named pipe usable for writing must already be on the upper filesystem,
but we are still taking copyMu for write when checking for upper. That
can be changed to a read lock to fix the common case.
However, a named pipe on the lower filesystem would still deadlock in
open(O_WRONLY) when it tries to actually perform copy up (which would
simply return EINVAL). Move the copy up type check before taking copyMu
for write to avoid this.
p9 must be modified, as it was incorrectly removing the file mode when
sending messages on the wire.
PiperOrigin-RevId: 249154033
Change-Id: Id6637130e567b03758130eb6c7cdbc976384b7d6
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* Creation of files, directories (and other fs objects) in a directory
should always update ctime.
* Same for removal.
* atime should not be updated on lookup, only readdir.
I've also renamed some misleading functions that update mtime and ctime.
PiperOrigin-RevId: 249115063
Change-Id: I30fa275fa7db96d01aa759ed64628c18bb3a7dc7
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This more directly matches what Linux does with unsupported
nodes.
PiperOrigin-RevId: 248780425
Change-Id: I17f3dd0b244f6dc4eb00e2e42344851b8367fbec
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There is a lot of redundancy that we can simplify in the stat_times
test. This will make it easier to add new tests. However, the
simplification reveals that cached uattrs on goferfs don't properly
update ctime on rename.
PiperOrigin-RevId: 248773425
Change-Id: I52662728e1e9920981555881f9a85f9ce04041cf
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PiperOrigin-RevId: 248437159
Change-Id: Ife71f6ca032fca59ec97a82961000ed0af257101
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PiperOrigin-RevId: 248263378
Change-Id: Ic057d2bb0b6212110f43ac4df3f0ac9bf931ab98
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PiperOrigin-RevId: 248249285
Change-Id: I9b6d267baa666798b22def590ff20c9a118efd47
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Closes #225
PiperOrigin-RevId: 247508791
Change-Id: I04f47cf2770b30043e5a272aba4ba6e11d0476cc
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And stop storing the Filesystem in the MountSource.
This allows us to decouple the MountSource filesystem type from the name of the
filesystem.
PiperOrigin-RevId: 247292982
Change-Id: I49cbcce3c17883b7aa918ba76203dfd6d1b03cc8
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Most are single line methods in hot paths.
PiperOrigin-RevId: 247050267
Change-Id: I428d78723fe00b57483185899dc8fa9e1f01e2ea
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Fixes #219
PiperOrigin-RevId: 246568639
Change-Id: Ic7afd15dde922638d77f6429c508d1cbe2e4288a
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PiperOrigin-RevId: 246036806
Change-Id: I5554a43a1f8146c927402db3bf98488a2da0fbe7
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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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Updates google/gvisor#206
PiperOrigin-RevId: 245880573
Change-Id: Ifa715e98d47f64b8a32b04ae9378d6cd6bd4025e
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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: 245452217
Change-Id: I7164d8f57fe34c17e601079eb9410a6d95af1869
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Maximum filename length is filesystem-dependent, and obtained via
statfs::f_namelen. This limit is usually 255 bytes (NAME_MAX), but not
always. For example, VFAT supports filenames of up to 255... UCS-2
characters, which Linux conservatively takes to mean UTF-8-encoded
bytes: fs/fat/inode.c:fat_statfs(), FAT_LFN_LEN * NLS_MAX_CHARSET_SIZE.
As a result, Linux's VFS does not enforce NAME_MAX:
$ rg --maxdepth=1 '\WNAME_MAX\W' fs/ include/linux/
fs/libfs.c
38: buf->f_namelen = NAME_MAX;
64: if (dentry->d_name.len > NAME_MAX)
include/linux/relay.h
74: char base_filename[NAME_MAX]; /* saved base filename */
include/linux/fscrypt.h
149: * filenames up to NAME_MAX bytes, since base64 encoding expands the length.
include/linux/exportfs.h
176: * understanding that it is already pointing to a a %NAME_MAX+1 sized
Remove this check from core VFS, and add it to ramfs (and by extension
tmpfs), where it is actually applicable:
mm/shmem.c:shmem_dir_inode_operations.lookup == simple_lookup *does*
enforce NAME_MAX.
PiperOrigin-RevId: 245324748
Change-Id: I17567c4324bfd60e31746a5270096e75db963fac
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PiperOrigin-RevId: 244773890
Change-Id: I2d0cd7789771276ba545b38efff6d3e24133baaa
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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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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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add renameMu.Lock when oldParent == newParent
in order to avoid data race in following report:
WARNING: DATA RACE
Read at 0x00c000ba2160 by goroutine 405:
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*Dirent).fullName()
pkg/sentry/fs/dirent.go:246 +0x6c
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*Dirent).FullName()
pkg/sentry/fs/dirent.go:356 +0x8b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*FDMap).String()
pkg/sentry/kernel/fd_map.go:135 +0x1e0
fmt.(*pp).handleMethods()
GOROOT/src/fmt/print.go:603 +0x404
fmt.(*pp).printArg()
GOROOT/src/fmt/print.go:686 +0x255
fmt.(*pp).doPrintf()
GOROOT/src/fmt/print.go:1003 +0x33f
fmt.Fprintf()
GOROOT/src/fmt/print.go:188 +0x7f
gvisor.googlesource.com/gvisor/pkg/log.(*Writer).Emit()
pkg/log/log.go:121 +0x89
gvisor.googlesource.com/gvisor/pkg/log.GoogleEmitter.Emit()
pkg/log/glog.go:162 +0x1acc
gvisor.googlesource.com/gvisor/pkg/log.(*GoogleEmitter).Emit()
<autogenerated>:1 +0xe1
gvisor.googlesource.com/gvisor/pkg/log.(*BasicLogger).Debugf()
pkg/log/log.go:177 +0x111
gvisor.googlesource.com/gvisor/pkg/log.Debugf()
pkg/log/log.go:235 +0x66
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Debugf()
pkg/sentry/kernel/task_log.go:48 +0xfe
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).DebugDumpState()
pkg/sentry/kernel/task_log.go:66 +0x11f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
pkg/sentry/kernel/task_run.go:272 +0xc80
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
pkg/sentry/kernel/task_run.go:91 +0x24b
Previous write at 0x00c000ba2160 by goroutine 423:
gvisor.googlesource.com/gvisor/pkg/sentry/fs.Rename()
pkg/sentry/fs/dirent.go:1628 +0x61f
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.renameAt.func1.1()
pkg/sentry/syscalls/linux/sys_file.go:1864 +0x1f8
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.fileOpAt( gvisor.googlesource.com/g/linux/sys_file.go:51 +0x20f
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.renameAt.func1()
pkg/sentry/syscalls/linux/sys_file.go:1852 +0x218
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.fileOpAt()
pkg/sentry/syscalls/linux/sys_file.go:51 +0x20f
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.renameAt()
pkg/sentry/syscalls/linux/sys_file.go:1840 +0x180
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Rename()
pkg/sentry/syscalls/linux/sys_file.go:1873 +0x60
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
pkg/sentry/kernel/task_syscall.go:165 +0x17a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
pkg/sentry/kernel/task_syscall.go:283 +0xb4
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
pkg/sentry/kernel/task_syscall.go:244 +0x10c
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
pkg/sentry/kernel/task_syscall.go:219 +0x1e3
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
pkg/sentry/kernel/task_run.go:215 +0x15a9
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
pkg/sentry/kernel/task_run.go:91 +0x24b
Reported-by: syzbot+e1babbf756fab380dfff@syzkaller.appspotmail.com
Change-Id: Icd2620bb3ea28b817bf0672d454a22b9d8ee189a
PiperOrigin-RevId: 242938741
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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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This also applies these permissions to other static proc files.
Change-Id: I4167e585fed49ad271aa4e1f1260babb3239a73d
PiperOrigin-RevId: 242898575
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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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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
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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
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https://github.com/google/gvisor/issues/145
PiperOrigin-RevId: 242044115
Change-Id: I8f140fe05e32ecd438b6be218e224e4b7fe05878
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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
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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
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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
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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
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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
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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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