gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/sentry/platform/systrap/syscall_thread_defs.go (about)

     1  // Copyright 2021 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package systrap
    16  
    17  import (
    18  	"gvisor.dev/gvisor/pkg/hostarch"
    19  )
    20  
    21  const syscallStubMessageOffset = hostarch.PageSize
    22  
    23  // syscallSentryMessage is a shared message that can be changed only from the
    24  // Sentry and a stub process can only read it.
    25  type syscallSentryMessage struct {
    26  	state  uint32
    27  	unused uint32
    28  	sysno  uint64
    29  	args   [6]uint64
    30  }
    31  
    32  // syscallStubMessage is a shared message that can be changed from a stub
    33  // process. It is used to notify the Sentry that a requested system call has
    34  // been executed.
    35  //
    36  // Attention: It can be compromised by user threads.
    37  type syscallStubMessage struct {
    38  	ret uint64
    39  }