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PiperOrigin-RevId: 280507239
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PiperOrigin-RevId: 280131840
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PiperOrigin-RevId: 279840214
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PiperOrigin-RevId: 279365629
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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
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It was possible to panic the sentry by opening a cache revalidating folder with
O_TRUNC|O_CREAT.
PiperOrigin-RevId: 278417533
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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
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Updates #267
PiperOrigin-RevId: 278402684
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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 #1117
Fixes #1119
PiperOrigin-RevId: 277981465
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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
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PiperOrigin-RevId: 277840416
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sigtimedwait is used to check pending signals and
it should not block.
PiperOrigin-RevId: 277777269
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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
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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
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Missing "for".
PiperOrigin-RevId: 277358513
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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
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Currently there are no ABI changes. We should check again closer to release.
PiperOrigin-RevId: 277349744
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Separate the handling of filenames and *fs.File objects in a more explicit way
for the sake of clarity.
PiperOrigin-RevId: 277344203
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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
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FDTable.GetFile doesn't exist.
PiperOrigin-RevId: 277089842
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This change simplifies the function signatures of functions related to loading
executables, such as LoadTaskImage, Load, loadBinary.
PiperOrigin-RevId: 276821187
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DelayOption is set on all new endpoints in gVisor.
PiperOrigin-RevId: 276746791
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The syscall filters don't allow kill, just tgkill.
PiperOrigin-RevId: 276718421
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PiperOrigin-RevId: 276441249
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PiperOrigin-RevId: 276419967
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