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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package boot
import (
"fmt"
rpb "gvisor.googlesource.com/gvisor/pkg/sentry/arch/registers_go_proto"
)
// cmdTracker reports only a single time for each different command argument in
// the syscall. It's used for generic syscalls like ioctl to report once per
// 'cmd'
type cmdTracker struct {
// argIdx is the syscall argument index where the command is located.
argIdx int
cmds map[uint32]struct{}
}
func newCmdTracker(argIdx int) *cmdTracker {
return &cmdTracker{argIdx: argIdx, cmds: make(map[uint32]struct{})}
}
// cmd returns the command based on the syscall argument index.
func (c *cmdTracker) cmd(regs *rpb.AMD64Registers) uint32 {
switch c.argIdx {
case 0:
return uint32(regs.Rdi)
case 1:
return uint32(regs.Rsi)
}
panic(fmt.Sprintf("unsupported syscall argument index %d", c.argIdx))
}
func (c *cmdTracker) shouldReport(regs *rpb.AMD64Registers) bool {
_, ok := c.cmds[c.cmd(regs)]
return !ok
}
func (c *cmdTracker) onReported(regs *rpb.AMD64Registers) {
c.cmds[c.cmd(regs)] = struct{}{}
}
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