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Go 1.17 is adding a new register-based calling convention [1] ("ABIInternal"),
which used is when calling between Go functions. Assembly functions are still
written using the old ABI ("ABI0"). That is, they still accept arguments on the
stack, and pass arguments to other functions on the stack. The call rules look
approximately like this:
1. Direct call from Go function to Go function: compiler emits direct
ABIInternal call.
2. Indirect call from Go function to Go function: compiler emits indirect
ABIInternal call.
3. Direct call from Go function to assembly function: compiler emits direct
ABI0 call.
4. Indirect call from Go function to assembly function: compiler emits indirect
ABIInternal call to ABI conversion wrapper function.
5. Direct or indirect call from assembly function to assembly function:
assembly/linker emits call to original ABI0 function.
6. Direct or indirect call from assembly function to Go function:
assembly/linker emits ABI0 call to ABI conversion wrapper function.
Case 4 is the interesting one here. Since the compiler can't know the ABI of an
indirect call, all indirect calls are made with ABIInternal. In order to
support indirect ABI0 assembly function calls, a wrapper is generated that
translates ABIInternal arguments to ABI0 arguments, calls the target function,
and then converts results back.
When the address of an ABI0 function is taken from Go code, it evaluates to the
address of this wrapper function rather than the target function so that later
indirect calls will work as expected.
This is normally fine, but gVisor does more than just call some of the assembly
functions we take the address of: either noting the start and end address for
future reference from a signal handler (safecopy), or copying the function text
to a new mapping (platforms).
Both of these fail with wrappers enabled (currently, this is Go tip with
GOEXPERIMENT=regabiwrappers) because these operations end up operating on the
wrapper instead of the target function.
We work around this issue by taking advantage of case 5: references to assembly
symbols from other assembly functions resolve directly to the desired target
symbol. Thus, rather than using reflect to get the address of a Go reference to
the functions, we create assembly stubs that return the address of the
function. This approach works just as well on current versions of Go, so the
change can be made immediately and doesn't require any build tags.
[1] https://go.googlesource.com/go/+/refs/heads/master/src/cmd/compile/abi-internal.md
PiperOrigin-RevId: 368505655
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PiperOrigin-RevId: 368495641
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PiperOrigin-RevId: 368470656
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Netstack is supposed to be somewhat independent of the rest of gVisor, and
others should be able to use it without pulling in excessive dependencies.
Currently, there is no way to fight dependency creep besides careful code
review.
This change introduces a test rule `netstack_deps_check` that ensures the target
only relies on gVisor targets and a short allowlist of external dependencies.
Users who add a dependency will see an error and have to manually update the
allowlist.
The set of packages to test comes from //runsc, as it uses packages we would
expect users to commonly rely on. It was generated via:
$ find ./runsc -name BUILD | xargs grep tcpip | awk '{print $2}' | sort | uniq
(Note: We considered giving //pkg/tcpip it's own go.mod, but this breaks go
tooling.)
PiperOrigin-RevId: 368456711
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We do not currently run random save tests.
PiperOrigin-RevId: 368309921
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Fix a race where the ACK completing the handshake can be dropped by
a closing listener without RST to the peer. The listener close would
reset the accepted queue and that causes the connecting endpoint
in SYNRCVD state to drop the ACK thinking the queue if filled up.
PiperOrigin-RevId: 368165509
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It's a common pattern in test code to reinterpret_cast<sockaddr*> from
sockaddr_* structs. Make AsSockAddr() for them so code looks better.
Note: Why not a wrapper type for `sockaddr_storage` and etc?
It's also a common need to have a local in-out variable of socklen_t.
Creating a wrapper type may however lead to this wrong code:
Wrapper addr;
socklen_t addrlen = sizeof(addr);
where sizeof(Wrapper) may not equal to sizeof(sockaddr_storage).
PiperOrigin-RevId: 368126229
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PiperOrigin-RevId: 368121539
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Some FileDescriptions in verity fs were opened but DecRef() were missing
after used. This could result in a ref leak.
PiperOrigin-RevId: 368096759
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Reported-by: syzbot+a6ef0f95a2c9e7da26f3@syzkaller.appspotmail.com
Reported-by: syzbot+2eaf8a9f115edec468fe@syzkaller.appspotmail.com
PiperOrigin-RevId: 368093861
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Use MarshalUnsafe for packed types as it is faster than MarshalBytes.
PiperOrigin-RevId: 368076368
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Holding this lock can cause the user's callback to deadlock if it
attempts to inspect the accept queue.
PiperOrigin-RevId: 368068334
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Fixes #5817
PiperOrigin-RevId: 368060056
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Some other cleanup while I'm here:
- Remove unused arguments
- Handle some unhandled errors
- Remove redundant casts
- Remove redundant parens
- Avoid shadowing `hash` package name
PiperOrigin-RevId: 367816161
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Use a linked list with cached length and capacity. The current channel
is already composed with a mutex and condition variable, and is never
used for its channel-like properties. Channels also require eager
allocation equal to their capacity, which a linked list does not.
PiperOrigin-RevId: 367766626
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The current SNAT implementation has several limitations:
- SNAT source port has to be specified. It is not optional.
- SNAT source port range is not supported.
- SNAT for UDP is a one-way translation. No response packets
are handled (because conntrack doesn't support UDP currently).
- SNAT and REDIRECT can't work on the same connection.
Fixes #5489
PiperOrigin-RevId: 367750325
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If the parent is not enabled in verity stepLocked(), failure to find
the child dentry could just mean an incorrect path.
PiperOrigin-RevId: 367733412
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PiperOrigin-RevId: 367730917
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Move maxListenBacklog check to the caller of endpoint Listen so that it
is applicable to Unix domain sockets as well.
This was changed in cl/366935921.
Reported-by: syzbot+a35ae7cdfdde0c41cf7a@syzkaller.appspotmail.com
PiperOrigin-RevId: 367728052
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To match the V4 variant.
PiperOrigin-RevId: 367691981
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Both code paths perform this check; extract it and remove the comment
that suggests it is unique to one of the paths.
PiperOrigin-RevId: 367666160
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Both callers of this function still drop this error on the floor, but
progress is progress.
Updates #4690.
PiperOrigin-RevId: 367604788
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Set root dentry and root hash in verity fs before we verify the root
directory if a root hash is provided. These are used during
verification.
PiperOrigin-RevId: 367547346
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We should only set parent after child is verified. Also, if the parent
is set before verified, destroyLocked() will try to grab parent.dirMu,
which may cause deadlock.
PiperOrigin-RevId: 367543655
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PiperOrigin-RevId: 367523491
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