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This is very similar to copy-up-coherent mmap in the VFS1 overlay, with the
minor wrinkle that there is no fs.InodeOperations.Mappable().
Updates #1199
PiperOrigin-RevId: 331206314
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Fixes an error where in case of a receive buffer larger than the host send
buffer size for a host backed unix dgram socket we would end up swallowing EOF
from recvmsg syscall causing the read() to block forever.
PiperOrigin-RevId: 331192810
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Some CPUs(eg: ampere-emag) can speculate past an ERET instruction and potentially perform
speculative accesses to memory before processing the exception return.
Since the register state is often controlled by a lower privilege level
at the point of an ERET, this could potentially be used as part of a
side-channel attack.
Signed-off-by: Bin Lu <bin.lu@arm.com>
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/proc/[pid]/{mounts,mountinfo}.
Also move VFS.MakeSyntheticMountpoint() (which is a utility wrapper around
VFS.MkdirAllAt(), itself a utility wrapper around VFS.MkdirAt()) to not be in
the middle of the implementation of these proc files.
Fixes #3878
PiperOrigin-RevId: 330843106
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This feature is too expensive for runsc, even with setattrclunk, because
fsgofer.localFile.SetAttr() ends up needing to call reopenProcFD(), incurring
two string allocations for the FD pathname, an fd.FD allocation, and two calls
to runtime.SetFinalizer() when the fd.FD is created and closed respectively
(b/133767962) (plus the actual cost of the syscalls, which is negligible).
PiperOrigin-RevId: 330843012
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PiperOrigin-RevId: 330777900
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PiperOrigin-RevId: 330629897
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- BindSocketThenOpen test was expecting the incorrect error when opening
a socket. Fixed that.
- VirtualFilesystem.BindEndpointAt should not require pop.Path.Begin.Ok()
because the filesystem implementations do not need to walk to the parent
dentry. This check also exists for MknodAt, MkdirAt, RmdirAt, SymlinkAt and
UnlinkAt but those filesystem implementations also need to walk to the parent
denty. So that check is valid. Added some syscall tests to test this.
PiperOrigin-RevId: 330625220
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The check in verity walk returns error for non ENOENT cases, and all
ENOENT results should be checked. This case was missing.
PiperOrigin-RevId: 330604771
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ioctl with FS_IOC_ENABLE_VERITY is added to verity file system to enable
a file as verity file. For a file, a Merkle tree is built with its data.
For a directory, a Merkle tree is built with the root hashes of its
children.
PiperOrigin-RevId: 330604368
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overlay/filesystem.go:lookupLocked() did not DecRef the VD on some error paths
when it would not end up saving or using the VD.
PiperOrigin-RevId: 330589742
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Updates #1487
PiperOrigin-RevId: 330580699
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Fixes pkg/tcpip/stack:stack_test flake experienced while running
TestCacheResolution with gotsan. This occurs when the test-runner takes longer
than the resolution timeout to call linkAddrCache.get.
In this test we don't care about the resolution timeout, so set it to the
maximum and rely on test-runner timeouts to avoid deadlocks.
PiperOrigin-RevId: 330566250
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The args.MountNamespaceVFS2 is used again after the nil check,
instead, mntnsVFS2 which holds the expected reference should be
used. This patch fixes this issue.
Fixes: #3855
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
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e.ID can't be read without holding e.mu. GetSockOpt was reading e.ID
when looking up OriginalDst without holding e.mu.
PiperOrigin-RevId: 330562293
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The existing implementation for TransportProtocol.{Set}Option take
arguments of an empty interface type which all types (implicitly)
implement; any type may be passed to the functions.
This change introduces marker interfaces for transport protocol options
that may be set or queried which transport protocol option types
implement to ensure that invalid types are caught at compile time.
Different interfaces are used to allow the compiler to enforce read-only
or set-only socket options.
RELNOTES: n/a
PiperOrigin-RevId: 330559811
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PiperOrigin-RevId: 330554450
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VFS1 and VFS2 host FDs have different dupping behavior,
making error prone to code for both. Change the contract
so that FDs are released as they are used, so the caller
can simple defer a block that closes all remaining files.
This also addresses handling of partial failures.
With this fix, more VFS2 tests can be enabled.
Updates #1487
PiperOrigin-RevId: 330112266
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Fixes #3779.
PiperOrigin-RevId: 330057268
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stack.cleanupEndpoints is protected by the stack.mu but that can cause
contention as the stack mutex is already acquired in a lot of hot paths during
new endpoint creation /cleanup etc. Moving this to a fine grained mutex should
reduce contention on the stack.mu.
PiperOrigin-RevId: 330026151
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b/166980357#comment56 shows:
- 837 goroutines blocked in:
gvisor/pkg/sync/sync.(*RWMutex).Lock
gvisor/pkg/tcpip/stack/stack.(*Stack).StartTransportEndpointCleanup
gvisor/pkg/tcpip/transport/tcp/tcp.(*endpoint).cleanupLocked
gvisor/pkg/tcpip/transport/tcp/tcp.(*endpoint).completeWorkerLocked
gvisor/pkg/tcpip/transport/tcp/tcp.(*endpoint).protocolMainLoop.func1
gvisor/pkg/tcpip/transport/tcp/tcp.(*endpoint).protocolMainLoop
- 695 goroutines blocked in:
gvisor/pkg/sync/sync.(*RWMutex).Lock
gvisor/pkg/tcpip/stack/stack.(*Stack).CompleteTransportEndpointCleanup
gvisor/pkg/tcpip/transport/tcp/tcp.(*endpoint).cleanupLocked
gvisor/pkg/tcpip/transport/tcp/tcp.(*endpoint).completeWorkerLocked
gvisor/pkg/tcpip/transport/tcp/tcp.(*endpoint).protocolMainLoop.func1
gvisor/pkg/tcpip/transport/tcp/tcp.(*endpoint).protocolMainLoop
- 3882 goroutines blocked in:
gvisor/pkg/sync/sync.(*RWMutex).Lock
gvisor/pkg/tcpip/stack/stack.(*Stack).GetTCPProbe
gvisor/pkg/tcpip/transport/tcp/tcp.newEndpoint
gvisor/pkg/tcpip/transport/tcp/tcp.(*protocol).NewEndpoint
gvisor/pkg/tcpip/stack/stack.(*Stack).NewEndpoint
All of these are contending on Stack.mu. Stack.StartTransportEndpointCleanup()
and Stack.CompleteTransportEndpointCleanup() insert/delete TransportEndpoints
in a map (Stack.cleanupEndpoints), and the former also does endpoint
unregistration while holding Stack.mu, so it's not immediately clear how
feasible it is to replace the map with a mutex-less implementation or how much
doing so would help. However, Stack.GetTCPProbe() just reads a function object
(Stack.tcpProbeFunc) that is almost always nil (as far as I can tell,
Stack.AddTCPProbe() is only called in tests), and it's called for every new TCP
endpoint. So converting it to an atomic.Value should significantly reduce
contention on Stack.mu, improving TCP endpoint creation latency and allowing
TCP endpoint cleanup to proceed.
PiperOrigin-RevId: 330004140
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blaze test <test_name>_fuchsia_test will run the corresponding packetimpact
test against fuchsia.
PiperOrigin-RevId: 329835290
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Accept on gVisor will return an error if a socket in the accept queue was closed
before Accept() was called. Linux will return the new fd even if the returned
socket is already closed by the peer say due to a RST being sent by the peer.
This seems to be intentional in linux more details on the github issue.
Fixes #3780
PiperOrigin-RevId: 329828404
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PiperOrigin-RevId: 329825497
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Updates #1199
PiperOrigin-RevId: 329802274
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PiperOrigin-RevId: 329801584
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- Make sync.SeqCountEpoch not a struct. This allows sync.SeqCount.BeginRead()
to be inlined.
- Mark sync.SeqAtomicLoad<T> nosplit to mitigate the Go compiler's refusal to
inline it. (Best I could get was "cost 92 exceeds budget 80".)
- Use runtime-guided spinning in SeqCount.BeginRead().
Benchmarks:
name old time/op new time/op delta
pkg:pkg/sync/sync goos:linux goarch:amd64
SeqCountWriteUncontended-12 8.24ns ± 0% 11.40ns ± 0% +38.35% (p=0.000 n=10+10)
SeqCountReadUncontended-12 0.33ns ± 0% 0.14ns ± 3% -57.77% (p=0.000 n=7+8)
pkg:pkg/sync/seqatomictest/seqatomic goos:linux goarch:amd64
SeqAtomicLoadIntUncontended-12 0.64ns ± 1% 0.41ns ± 1% -36.40% (p=0.000 n=10+8)
SeqAtomicTryLoadIntUncontended-12 0.18ns ± 4% 0.18ns ± 1% ~ (p=0.206 n=10+8)
AtomicValueLoadIntUncontended-12 0.27ns ± 3% 0.27ns ± 0% -1.77% (p=0.000 n=10+8)
(atomic.Value.Load is, of course, inlined. We would expect an uncontended
inline SeqAtomicLoad<int> to perform identically to SeqAtomicTryLoad<int>.) The
"regression" in BenchmarkSeqCountWriteUncontended, despite this CL changing
nothing in that path, is attributed to microarchitectural subtlety; the
benchmark loop is unchanged except for its address:
Before this CL:
:0 0x4e62d1 48ffc2 INCQ DX
:0 0x4e62d4 48399110010000 CMPQ DX, 0x110(CX)
:0 0x4e62db 7e26 JLE 0x4e6303
:0 0x4e62dd 90 NOPL
:0 0x4e62de bb01000000 MOVL $0x1, BX
:0 0x4e62e3 f00fc118 LOCK XADDL BX, 0(AX)
:0 0x4e62e7 ffc3 INCL BX
:0 0x4e62e9 0fbae300 BTL $0x0, BX
:0 0x4e62ed 733a JAE 0x4e6329
:0 0x4e62ef 90 NOPL
:0 0x4e62f0 bb01000000 MOVL $0x1, BX
:0 0x4e62f5 f00fc118 LOCK XADDL BX, 0(AX)
:0 0x4e62f9 ffc3 INCL BX
:0 0x4e62fb 0fbae300 BTL $0x0, BX
:0 0x4e62ff 73d0 JAE 0x4e62d1
After this CL:
:0 0x4e6361 48ffc2 INCQ DX
:0 0x4e6364 48399110010000 CMPQ DX, 0x110(CX)
:0 0x4e636b 7e26 JLE 0x4e6393
:0 0x4e636d 90 NOPL
:0 0x4e636e bb01000000 MOVL $0x1, BX
:0 0x4e6373 f00fc118 LOCK XADDL BX, 0(AX)
:0 0x4e6377 ffc3 INCL BX
:0 0x4e6379 0fbae300 BTL $0x0, BX
:0 0x4e637d 733a JAE 0x4e63b9
:0 0x4e637f 90 NOPL
:0 0x4e6380 bb01000000 MOVL $0x1, BX
:0 0x4e6385 f00fc118 LOCK XADDL BX, 0(AX)
:0 0x4e6389 ffc3 INCL BX
:0 0x4e638b 0fbae300 BTL $0x0, BX
:0 0x4e638f 73d0 JAE 0x4e6361
PiperOrigin-RevId: 329754148
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This is to cover the common pattern: open->read/write->close,
where SetAttr needs to be called to update atime/mtime before
the file is closed.
Benchmark results:
BM_OpenReadClose/10240 CPU
setattr+clunk: 63783 ns
VFS2: 68109 ns
VFS1: 72507 ns
Updates #1198
PiperOrigin-RevId: 329628461
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On receiving an ACK with unacceptable ACK number, in a closing state,
TCP, needs to reply back with an ACK with correct seq and ack numbers and
remain in same state. This change is as per RFC793 page 37, but with a
difference that it does not apply to ESTABLISHED state, just as in Linux.
Also add more tests to check for OTW sequence number and unacceptable
ack numbers in these states.
Fixes #3785
PiperOrigin-RevId: 329616283
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Updates #2972
PiperOrigin-RevId: 329584905
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PiperOrigin-RevId: 329572337
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PiperOrigin-RevId: 329564614
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PiperOrigin-RevId: 329526153
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As documented for gofer.dentry.hostFD.
PiperOrigin-RevId: 329372319
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Implement walk directories in gvisor verity file system. For each step,
the child dentry is verified against a verified parent root hash.
PiperOrigin-RevId: 329358747
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PiperOrigin-RevId: 329349158
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PiperOrigin-RevId: 329036994
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