Note that in VFS2, filesystem device numbers are per-vfs.FilesystemImpl rather
than global, avoiding the need for a "registry" type to handle save/restore.
(This is more consistent with Linux anyway: compare e.g.
mm/shmem.c:shmem_mount() => fs/super.c:mount_nodev() => (indirectly)
set_anon_super().)
PiperOrigin-RevId: 291425193
Go 1.14+ sends SIGURG to Ms to attempt asynchronous preemption of a G. Since it
can't guarantee that a SIGURG is only related to preemption, it continues to
forward them to signal.Notify (see runtime.sighandler).
We should ignore these signals, as applications shouldn't receive them. Note
that this means that truly external SIGURG can no longer be sent to the
application (as with SIGCHLD).
PiperOrigin-RevId: 291415357
The kernel may return EINTR from:
kvm_create_vm
kvm_init_mmu_notifier
mmu_notifier_register
do_mmu_notifier_register
mm_take_all_locks
Go 1.14's preemptive scheduling signals make hitting this much more likely.
PiperOrigin-RevId: 291212669
The iptables binary is looking for libxt_.so when it should be looking
for libxt_udp.so, so it's having an issue reading the data in
xt_match_entry. I think it may be an alignment issue.
Trying to fix this is leading to me fighting with the metadata struct,
so I'm gonna go kill that.
Also renames TMutex to Mutex.
These custom mutexes aren't any worse than the standard library versions (same
code), so having both seems redundant.
PiperOrigin-RevId: 290873587
Such a stat accounts for all connections that are currently
established and not yet transitioned to close state.
Also fix bug in double increment of CurrentEstablished stat.
Fixes#1579
PiperOrigin-RevId: 290827365
Note that these simply will use the same logic as getxattr and setxattr, which
is not yet implemented for most filesystems.
PiperOrigin-RevId: 290800960
Java 11 parses /proc/self/mountinfo for cgroup information. Java 11.0.4 uses
the mount path to determine what cgroups existed, but Java 11.0.5 reads the
cgroup names from the superblock options.
This CL adds the cgroup name to the superblock options if the filesystem type
is "cgroup". Since gVisor doesn't actually support cgroups yet, we just infer
the cgroup name from the path.
PiperOrigin-RevId: 290434323
CERT Advisory CA-96.21 III. Solution advises that devices drop packets which
could not have correctly arrived on the wire, such as receiving a packet where
the source IP address is owned by the device that sent it.
Fixes#1507
PiperOrigin-RevId: 290378240
x86 and arm64 use a different stat struct in Linux
kernel, so the stat() syscall implementation has
to handle the file stat data separately.
Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: If3986e915a667362257a54e7fbbcc1fe18951015
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/1493 from xiaobo55x:stat f15a216d9297eb9a96d2c483d396a9919145d7fa
PiperOrigin-RevId: 290274287
There was a very bare get/setxattr in the InodeOperations interface. Add
context.Context to both, size to getxattr, and flags to setxattr.
Note that extended attributes are passed around as strings in this
implementation, so size is automatically encoded into the value. Size is
added in getxattr so that implementations can return ERANGE if a value is larger
than can fit in the user-allocated buffer. This prevents us from unnecessarily
passing around an arbitrarily large xattr when the user buffer is actually too
small.
Don't use the existing xattrwalk and xattrcreate messages and define our
own, mainly for the sake of simplicity.
Extended attributes will be implemented in future commits.
PiperOrigin-RevId: 290121300
sys_clone has many flavors in Linux, and amd64 chose
a different one from x86(different arguments order).
Ref kernel/fork.c for more info.
Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: I6c8cbc685f4a6e786b171715ab68292fc95cbf48
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/1545 from xiaobo55x:clone 156bd2dfbc63ef5291627b0578ddea77997393b2
PiperOrigin-RevId: 290093953
Signed-off-by: Bin Lu <bin.lu@arm.com>
Change-Id: I9cce23db4e5caec82ce42b4970fdb7f7e8c08f1d
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/773 from lubinszARM:pr_arch_basic 3fe2fd8e6286766bbe489ef971dce204f924feba
PiperOrigin-RevId: 289795569
This patch holds taskset.mu when getting tty. If we don't
do this, it may cause a "unlock of unlocked mutex" problem,
since signalHandlers may be replaced by CopyForExec() in
runSyscallAfterExecStop after the signalHandlers.mu has
been holded in TTY().
The problem is easy to reproduce with keeping to do "runsc ps".
The crash log is :
fatal error: sync: unlock of unlocked mutex
goroutine 5801304 [running]:
runtime.throw(0xfd019c, 0x1e)
GOROOT/src/runtime/panic.go:774 +0x72 fp=0xc001ba47b0 sp=0xc001ba4780 pc=0x431702
sync.throw(0xfd019c, 0x1e)
GOROOT/src/runtime/panic.go:760 +0x35 fp=0xc001ba47d0 sp=0xc001ba47b0 pc=0x431685
sync.(*Mutex).unlockSlow(0xc00cf94a30, 0xc0ffffffff)
GOROOT/src/sync/mutex.go:196 +0xd6 fp=0xc001ba47f8 sp=0xc001ba47d0 pc=0x4707d6
sync.(*Mutex).Unlock(0xc00cf94a30)
GOROOT/src/sync/mutex.go:190 +0x48 fp=0xc001ba4818 sp=0xc001ba47f8 pc=0x4706e8
gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).TTY(0xc011a9e800, 0x0)
pkg/sentry/kernel/tty.go:38 +0x88 fp=0xc001ba4868 sp=0xc001ba4818 pc=0x835fa8
gvisor.dev/gvisor/pkg/sentry/control.Processes(0xc00025ae00, 0xc013e397c0, 0x40, 0xc0137b9800, 0x1, 0x7f292e9a4cc0)
pkg/sentry/control/proc.go:366 +0x355 fp=0xc001ba49a0 sp=0xc001ba4868 pc=0x9ac4a5
gvisor.dev/gvisor/runsc/boot.(*containerManager).Processes(0xc0003b62c0, 0xc0051423d0, 0xc0137b9800, 0x0, 0x0)
runsc/boot/controller.go:228 +0xdf fp=0xc001ba49e8 sp=0xc001ba49a0 pc=0xaf06cf
Signed-off-by: chris.zn <chris.zn@antfin.com>
* Rename syncutil to sync.
* Add aliases to sync types.
* Replace existing usage of standard library sync package.
This will make it easier to swap out synchronization primitives. For example,
this will allow us to use primitives from github.com/sasha-s/go-deadlock to
check for lock ordering violations.
Updates #1472
PiperOrigin-RevId: 289033387
When PCID is disabled, there would throw a panic
when dropPageTables() access to c.PCID without check.
Signed-off-by: Lai Jiangshan <eag0628@gmail.com>
This change calls a new Truncate method on the EndpointReader in RecvMsg for
both netlink and unix sockets. This allows readers such as sockets to peek at
the length of data without actually reading it to a buffer.
Fixes#993#1240
PiperOrigin-RevId: 288800167
This gets us closer to passing the iptables tests and opens up iptables
so it can be worked on by multiple people.
A few restrictions are enforced for security (i.e. we don't want to let
users write a bunch of iptables rules and then just not enforce them):
- Only the filter table is writable.
- Only ACCEPT rules with no matching criteria can be added.
Right now, we need to call ptrace(PTRACE_SYSCALL) and wait() twice to execute
one system call in a stub process. With these changes, we will need to call
ptrace + wait only once.
In addition, this allows to workaround the kernel bug when a stub process
doesn't stop on syscall-exit-stop and starts executing the next system call.
Reported-by: syzbot+37143cafa8dc3b5008ee@syzkaller.appspotmail.com
PiperOrigin-RevId: 288393029
- Renamed memfs to tmpfs.
- Copied fileRangeSet bits from fs/fsutil/ to fsimpl/tmpfs/
- Changed tmpfs to be backed by filemem instead of byte slice.
- regularFileReadWriter uses a sync.Pool, similar to gofer client.
PiperOrigin-RevId: 288356380
Currently, shm.Registry.FindByID will return Shm instances without taking an
additional reference on them, making it possible for them to disappear.
More explicitly handle references. All callers hold a reference for the
duration that they hold the instance. Registry.shms may transitively hold Shms
with no references, so it must TryIncRef to determine if they are still valid.
PiperOrigin-RevId: 288314529
- Add FileDescriptionOptions.UseDentryMetadata, which reduces the amount of
boilerplate needed for device FDs and the like between filesystems.
- Switch back to having FileDescription.Init() take references on the Mount and
Dentry; otherwise managing refcounts around failed calls to
OpenDeviceSpecialFile() / Device.Open() is tricky.
PiperOrigin-RevId: 287575574
Added the ability to get/set the IP_RECVTOS socket option on UDP endpoints. If
enabled, TOS from the incoming Network Header passed as ancillary data in the
ControlMessages.
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
PiperOrigin-RevId: 287029703
There are 2 jobs have been finished in this patch:
1, a comment was added to explain the purpose of the extra NOPs in Vectors().
2, some merge errors were fixed.
Signed-off-by: Bin Lu <bin.lu@arm.com>
- Make FilesystemImpl methods that operate on parent directories require
!rp.Done() (i.e. there is at least one path component to resolve) as
precondition and postcondition (in cases where they do not finish path
resolution due to mount boundary / absolute symlink), and require that they
do not need to follow the last path component (the file being created /
deleted) as a symlink. Check for these in VFS.
- Add FilesystemImpl.GetParentDentryAt(), which is required to obtain the old
parent directory for VFS.RenameAt(). (Passing the Dentry to be renamed
instead has the wrong semantics if the file named by the old path is a mount
point since the Dentry will be on the wrong Mount.)
- Update memfs to implement these methods correctly (?), including RenameAt.
- Change fspath.Parse() to allow empty paths (to simplify implementation of
AT_EMPTY_PATH).
- Change vfs.PathOperation to take a fspath.Path instead of a raw pathname;
non-test callers will need to fspath.Parse() pathnames themselves anyway in
order to detect absolute paths and select PathOperation.Start accordingly.
PiperOrigin-RevId: 286934941
Linux PTRACE_SYSEMU support on arm64 was merged to mainline from
V5.3, and the corresponding support in go also enabled recently.
Since the "syscall" package is locked down from go 1.4, so the ptrace
PTRACE_SYSEMU definition can't be added to package "syscall" on arm64.
According to the golang community, updates required by new systems or
versions should use the corresponding package in the golang.org/x/sys
repository instead(https://golang.org/pkg/syscall/).
Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: I2f917bb2be62f990c3e158e2bb99e094ea03f751
This change is needed to be compatible with the Linux kernel.
There is no glibc wrapper for the futex system call, so it is easy to
make a mistake and call syscall(__NR_futex, FUTEX_WAKE, addr) without
the fourth argument. This works on Linux, because it wakes one waiter
even if val is nonpositive.
PiperOrigin-RevId: 286494396
Otherwise a copy happens, which triggers a data race when reading
masterInodeOperations.SimpleFileOperations.uattr, which must be accessed with a
lock held.
PiperOrigin-RevId: 286464473
Several jobs were finished in this patch:
1, provide functions to get/set fpcr/fpsr/vregs
2, support lazy-fpsimd-context-switch in el1
Signed-off-by: Bin Lu <bin.lu@arm.com>
Add checks for input arguments, file type, permissions, etc. that match
the Linux implementation. A call to get/setxattr that passes all the
checks will still currently return EOPNOTSUPP. Actual support will be
added in following commits.
Only allow user.* extended attributes for the time being.
PiperOrigin-RevId: 285835159
Copy up parent when binding UDS on overlayfs is supported in commit
02ab1f187c.
But the using of copyUp in overlayBind will cause sentry stuck, reason
is dead lock in renameMu.
1 [Process A] Invoke a Unix socket bind operation
renameMu is hold in fs.(*Dirent).genericCreate by process A
2 [Process B] Invoke a read syscall on /proc/task/mounts
waitng on Lock of renameMu in fs.(*MountNamespace).FindMount
3 [Process A] Continue Unix socket bind operation
wating on RLock of renameMu in fs.copyUp
Root cause is recursive reading lock of reanmeMu in bind call trace,
if there are writing lock between the two reading lock, then deadlock
occured.
Fixes#1397
After the finalizer optimize in 76039f8959
commit, clientFile needs to closed before finalizer release it.
The clientFile is not closed if it is created via
gofer.(*inodeOperations).Bind, this will cause fd leak which is hold
by gofer process.
Fixes#1396
Signed-off-by: Yong He <chenglang.hy@antfin.com>
Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com>
There are 4 jobs were finished in this package:
1, Virtual machine initialization.
2, Bluepill implementation.
3, Move ring0.Vectors() into the address with 11-bits alignment.
4, Basic support for "SwitchToUser".
Signed-off-by: Bin Lu <bin.lu@arm.com>
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/919 from lubinszARM:pr_kvm eedea52db451bf62722759009a9f14c54a69c55f
PiperOrigin-RevId: 285501256
The implementation follows the linux behavior where specifying
a TCP_USER_TIMEOUT will cause the resend timer to honor the
user specified timeout rather than the default rto based timeout.
Further it alters when connections are timedout due to keepalive
failures. It does not alter the behavior of when keepalives are
sent. This is as per the linux behavior.
PiperOrigin-RevId: 285099795
The former is needed for vfs.FileDescription to implement
memmap.MappingIdentity, and the latter is needed to implement getcwd(2).
PiperOrigin-RevId: 285051855
runsc debug --ps list all processes with all threads. This option is added to
the debug command but not to the ps command, because it is going to be used for
debug purposes and we want to add any useful information without thinking about
backward compatibility.
This will help to investigate syzkaller issues.
PiperOrigin-RevId: 285013668
Package strace is missing some syscalls we actually implement (e.g.,
getrandom). We also see newer syscalls sometimes (e.g., membarrier) that would
be handy to have formatted.
Let's go ahead and add all syscalls in the latest upstream release (v5.4), even
though we only intend to implement v4.4. None of them are implemented, just
included as placeholders.
PiperOrigin-RevId: 284797577
Threadgroups already know their TTY (if they have one), which now contains the
TTY Index, and is returned in the Processes() call.
PiperOrigin-RevId: 284263850
There are two potential ways of sending a TOS byte with outgoing packets:
including a control message in sendmsg, or setting the IP_TOS/IPV6_TCLASS
socket options (for IPV4 and IPV6 respectively). This change lets hostinet
support the latter.
Fixes#1188
PiperOrigin-RevId: 283550925
There are two potential ways of sending a TOS byte with outgoing packets:
including a control message in sendmsg, or setting the IP_TOS/IPV6_TCLASS
socket options (for IPV4 and IPV6 respectively). This change lets hostinet
support the former.
PiperOrigin-RevId: 283346737
This involves allowing getsockopt/setsockopt for the corresponding socket
options, as well as allowing hostinet to process control messages received from
the actual recvmsg syscall.
PiperOrigin-RevId: 282851425
This allows writable proc and devices files to be opened with O_CREAT|O_TRUNC.
This is encountered most frequently when interacting with proc or devices files
via the command line.
e.g. $ echo 8192 1048576 4194304 > /proc/sys/net/ipv4/tcp_rmem
Also adds a test to test the behavior of open(O_TRUNC), truncate, and ftruncate
on named pipes.
Fixes#1116
PiperOrigin-RevId: 282677425
For test case "TestApplicationFault",
Memory-fault in guest user level will be trapped in el0_da.
And in el0_da, we use mmio_exit to leave the KVM guest.
Signed-off-by: Bin Lu <bin.lu@arm.com>
For test case "TestApplicationSyscall",
Syscall in guest user level will be trapped in el0_svc.
And in el0_svc, we use mmio_exit to leave the KVM guest for now.
Signed-off-by: Bin Lu <bin.lu@arm.com>
Mainly 2 jobs were finished in this patch:
1, context switching for a container application:
a, R0-R30 b, pc\pstate\sp_el0 c, pagetable_el0 for container application
This job can help us to pass the following test cases:
"TestApplicationSyscall", "TestApplicationFault"
2, checking pagetable_el0 is empty
This job can help us to pass the following test case: "TestInvalidate"
Signed-off-by: Bin Lu <bin.lu@arm.com>
- Remove the Filesystem argument from DentryImpl.*Ref(); in general DentryImpls
that need the Filesystem for reference counting will probably also need it
for other interface methods that don't plumb Filesystem, so it's easier to
just store a pointer to the filesystem in the DentryImpl.
- Add a pointer to the VirtualFilesystem to Filesystem, which is needed by the
gofer client to disown dentries for cache eviction triggered by dentry
reference count changes.
- Rename FilesystemType.NewFilesystem to GetFilesystem; in some cases (e.g.
sysfs, cgroupfs) it's much cleaner for there to be only one Filesystem that
is used by all mounts, and in at least one case (devtmpfs) it's visibly
incorrect not to do so, so NewFilesystem doesn't always actually create and
return a *new* Filesystem.
- Require callers of FileDescription.Init() to increment Mount/Dentry
references. This is because the gofer client may, in the OpenAt() path, take
a reference on a dentry with 0 references, which is safe due to
synchronization that is outside the scope of this CL, and it would be safer
to still have its implementation of DentryImpl.IncRef() check for an
increment for 0 references in other cases.
- Add FileDescription.TryIncRef. This is used by the gofer client to take
references on "special file descriptions" (FDs for files such as pipes,
sockets, and devices), which use per-FD handles (fids) instead of
dentry-shared handles, for sync() and syncfs().
PiperOrigin-RevId: 282473364
This is required to test filesystems with a non-trivial implementation of
FilesystemImpl.Release(). Propagation isn't handled yet, and umount isn't yet
plumbed out to VirtualFilesystem.UmountAt(), but otherwise the implementation
of umount is believed to be correct.
- Move entering mountTable.seq writer critical sections to callers of
mountTable.{insert,remove}Seqed. This is required since umount(2) must ensure
that no new references are taken on the candidate mount after checking that
it isn't busy, which is only possible by entering a vfs.mountTable.seq writer
critical section before the check and remaining in it until after
VFS.umountRecursiveLocked() is complete. (Linux does the same thing:
fs/namespace.c:do_umount() => lock_mount_hash(),
fs/pnode.c:propagate_mount_busy(), umount_tree(), unlock_mount_hash().)
- It's not possible for dentry deletion to umount while only holding
VFS.mountMu for reading, but it's also very unappealing to hold VFS.mountMu
exclusively around e.g. gofer unlink RPCs. Introduce dentry.mu to avoid these
problems. This means that VFS.mountMu is never acquired for reading, so
change it to a sync.Mutex.
PiperOrigin-RevId: 282444343
Signed-off-by: Bin Lu <bin.lu@arm.com>
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/891 from lubinszARM:pr_pagetable 2385de75a8662af3ab1ae289dd74dd0e5dcfaf66
PiperOrigin-RevId: 282013224
Note that the Sentry still calls Truncate() on the file before calling Open.
A new p9 version check was added to ensure that the p9 server can handle the
the OpenTruncate flag. If not, then the flag is stripped before sending.
PiperOrigin-RevId: 281609112
It was possible to panic the sentry by opening a cache revalidating folder with
O_TRUNC|O_CREAT.
Avoids breaking php tests.
PiperOrigin-RevId: 280533213
Initialize the VDSO "os" and "arch" fields explicitly,
or the VDSO load process would failed on arm64 platform.
Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: Ic6768df88e43cd7c7956eb630511672ae11ac52f
newfstatat() syscall is not supported on arm64, so we resort
to use the fstatat() syscall.
Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: Iea95550ea53bcf85c01f7b3b95da70ad0952177d
This patch also include a minor change to replace syscall.Dup2
with syscall.Dup3 which was missed in a previous commit(ref a25a976).
Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: I00beb9cc492e44c762ebaa3750201c63c1f7c2f3
This change adds explicit support for honoring the 2MSL timeout
for sockets in TIME_WAIT state. It also adds support for the
TCP_LINGER2 option that allows modification of the FIN_WAIT2
state timeout duration for a given socket.
It also adds an option to modify the Stack wide TIME_WAIT timeout
but this is only for testing. On Linux this is fixed at 60s.
Further, we also now correctly process RST's in CLOSE_WAIT and
close the socket similar to linux without moving it to error
state.
We also now handle SYN in ESTABLISHED state as per
RFC5961#section-4.1. Earlier we would just drop these SYNs.
Which can result in some tests that pass on linux to fail on
gVisor.
Netstack now honors TIME_WAIT correctly as well as handles the
following cases correctly.
- TCP RSTs in TIME_WAIT are ignored.
- A duplicate TCP FIN during TIME_WAIT extends the TIME_WAIT
and a dup ACK is sent in response to the FIN as the dup FIN
indicates potential loss of the original final ACK.
- An out of order segment during TIME_WAIT generates a dup ACK.
- A new SYN w/ a sequence number > the highest sequence number
in the previous connection closes the TIME_WAIT early and
opens a new connection.
Further to make the SYN case work correctly the ISN (Initial
Sequence Number) generation for Netstack has been updated to
be as per RFC. Its not a pure random number anymore and follows
the recommendation in https://tools.ietf.org/html/rfc6528#page-3.
The current hash used is not a cryptographically secure hash
function. A separate change will update the hash function used
to Siphash similar to what is used in Linux.
PiperOrigin-RevId: 279106406
NETLINK_KOBJECT_UEVENT sockets send udev-style messages for device events.
gVisor doesn't have any device events, so our sockets don't need to do anything
once created.
systemd's device manager needs to be able to create one of these sockets. It
also wants to install a BPF filter on the socket. Since we'll never send any
messages, the filter would never be invoked, thus we just fake it out.
Fixes#1117
Updates #1119
PiperOrigin-RevId: 278405893
Since we only supporting sending messages from the kernel, the peer is always
the kernel, simplifying handling.
There are currently no known users of SO_PASSCRED that would actually receive
messages from gVisor, but adding full support is barely more work than stubbing
out fake support.
Updates #1117Fixes#1119
PiperOrigin-RevId: 277981465
The watchdog currently can find stuck tasks, but has no way to tell if the
sandbox is stuck before the application starts executing.
This CL adds a startup timeout and action to the watchdog. If Start() is not
called before the given timeout (if non-zero), then the watchdog will take the
action.
PiperOrigin-RevId: 277970577
On Arm platform, "setMemoryRegion" has extra permission checks.
In virt/kvm/arm/mmu.c: kvm_arch_prepare_memory_region()
....
if (writable && !(vma->vm_flags & VM_WRITE)) {
ret = -EPERM;
break;
}
....
So, for Arm platform, the "flags" for kvm_memory_region is required.
And on x86 platform, the "flags" can be always set as '0'.
Signed-off-by: Bin Lu <bin.lu@arm.com>
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/810 from lubinszARM:pr_setregion 8c99b19cfb0c859c6630a1cfff951db65fcf87ac
PiperOrigin-RevId: 277602603
In the future this will replace DanglingEndpoints. DanglingEndpoints must be
kept for now due to issues with save/restore.
This is arguably a cleaner design and allows the stack to know which transport
endpoints might still be using its link endpoints.
Updates #837
PiperOrigin-RevId: 277386633
When execveat is called on an interpreter script, the symlink count for
resolving the script path should be separate from the count for resolving the
the corresponding interpreter. An ELOOP error should not occur if we do not hit
the symlink limit along any individual path, even if the total number of
symlinks encountered exceeds the limit.
Closes#574
PiperOrigin-RevId: 277358474
When an interpreter script is opened with O_CLOEXEC and the resulting fd is
passed into execveat, an ENOENT error should occur (the script would otherwise
be inaccessible to the interpreter). This matches the actual behavior of
Linux's execveat.
PiperOrigin-RevId: 277306680
This change simplifies the function signatures of functions related to loading
executables, such as LoadTaskImage, Load, loadBinary.
PiperOrigin-RevId: 276821187
Use fd.next to store the iteration start position, which can be used to accelerate allocating new FDs.
And adding the corresponding gtest benchmark to measure performance.
@tanjianfeng
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/758 from DarcySail:master 96685ec7886dfe1a64988406831d3bc002b438cc
PiperOrigin-RevId: 276351250
Kevin Krakauer
Jamie Liu
Michael Pratt
Nicolas Lacasse
gVisor bot
Rahat Mahmood
Ian Gudger
Mithun Iyer
Fabricio Voznika
Dean Deng
Haibo Xu
Eyal Soha
Adin Scannell
lubinszARM
chris.zn
Tamir Duberstein
Lai Jiangshan
Ian Lewis
Ting-Yu Wang
Andrei Vagin
Zach Koopmans
Ryan Heacock
Bin Lu
Yong He
Bhasker Hariharan
DarcySail