55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
// Copyright 2018 Google LLC
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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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package boot
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import (
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"fmt"
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rpb "gvisor.googlesource.com/gvisor/pkg/sentry/arch/registers_go_proto"
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)
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// cmdTracker reports only a single time for each different command argument in
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// the syscall. It's used for generic syscalls like ioctl to report once per
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// 'cmd'
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type cmdTracker struct {
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// argIdx is the syscall argument index where the command is located.
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argIdx int
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cmds map[uint32]struct{}
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}
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func newCmdTracker(argIdx int) *cmdTracker {
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return &cmdTracker{argIdx: argIdx, cmds: make(map[uint32]struct{})}
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}
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// cmd returns the command based on the syscall argument index.
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func (c *cmdTracker) cmd(regs *rpb.AMD64Registers) uint32 {
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switch c.argIdx {
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case 0:
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return uint32(regs.Rdi)
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case 1:
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return uint32(regs.Rsi)
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}
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panic(fmt.Sprintf("unsupported syscall argument index %d", c.argIdx))
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}
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func (c *cmdTracker) shouldReport(regs *rpb.AMD64Registers) bool {
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_, ok := c.cmds[c.cmd(regs)]
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return !ok
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}
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func (c *cmdTracker) onReported(regs *rpb.AMD64Registers) {
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c.cmds[c.cmd(regs)] = struct{}{}
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}
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