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Konstantin BogomolovandgVisor bot
cb3de545ca
github.com/google/gvisor/pull/14531 exposed a race window with stub threads setting ThreadID and the sentry reading it. If the sentry attempted to interrupt a stub that in the process of switching a context back, it could have read an invalid thread ID along with a context state that indicated it was still being worked on. This window has existed before #14531, but was relatively benign; with that CL, the window became punishable by subprocess death. The (mostly generated) test seems to reliably test the race-window in case things get reordered in some future refactor. Fixes #14531. PiperOrigin-RevId: 974868738
27 lines
916 B
Go
27 lines
916 B
Go
// Copyright 2026 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build amd64
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// +build amd64
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// Package testutil provides common test utilities for systrap.
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package testutil
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// UserCode is the user program: for (;;) getpid();
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var UserCode = []byte{
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0x48, 0xc7, 0xc0, 0x27, 0x00, 0x00, 0x00, // movq $SYS_getpid, %rax
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0x0f, 0x05, // syscall
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0xeb, 0xf5, // jmp back to movq
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}
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