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// Copyright 2018 The gVisor Authors.
//
// 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 mm
import (
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/hostarch"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/vfs"
)
// Dumpability describes if and how core dumps should be created.
type Dumpability int
const (
// NotDumpable indicates that core dumps should never be created.
NotDumpable Dumpability = iota
// UserDumpable indicates that core dumps should be created, owned by
// the current user.
UserDumpable
// RootDumpable indicates that core dumps should be created, owned by
// root.
RootDumpable
)
// Dumpability returns the dumpability.
func (mm *MemoryManager) Dumpability() Dumpability {
return Dumpability(mm.dumpability.Load())
}
// SetDumpability sets the dumpability.
func (mm *MemoryManager) SetDumpability(d Dumpability) {
mm.dumpability.Store(int32(d))
}
// ArgvStart returns the start of the application argument vector.
//
// There is no guarantee that this value is sensible w.r.t. ArgvEnd.
func (mm *MemoryManager) ArgvStart() hostarch.Addr {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.argv.Start
}
// SetArgvStart sets the start of the application argument vector.
func (mm *MemoryManager) SetArgvStart(a hostarch.Addr) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.argv.Start = a
}
// ArgvEnd returns the end of the application argument vector.
//
// There is no guarantee that this value is sensible w.r.t. ArgvStart.
func (mm *MemoryManager) ArgvEnd() hostarch.Addr {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.argv.End
}
// SetArgvEnd sets the end of the application argument vector.
func (mm *MemoryManager) SetArgvEnd(a hostarch.Addr) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.argv.End = a
}
// EnvvStart returns the start of the application environment vector.
//
// There is no guarantee that this value is sensible w.r.t. EnvvEnd.
func (mm *MemoryManager) EnvvStart() hostarch.Addr {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.envv.Start
}
// SetEnvvStart sets the start of the application environment vector.
func (mm *MemoryManager) SetEnvvStart(a hostarch.Addr) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.envv.Start = a
}
// EnvvEnd returns the end of the application environment vector.
//
// There is no guarantee that this value is sensible w.r.t. EnvvStart.
func (mm *MemoryManager) EnvvEnd() hostarch.Addr {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.envv.End
}
// SetEnvvEnd sets the end of the application environment vector.
func (mm *MemoryManager) SetEnvvEnd(a hostarch.Addr) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.envv.End = a
}
// Auxv returns the current map of auxiliary vectors.
func (mm *MemoryManager) Auxv() arch.Auxv {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return append(arch.Auxv(nil), mm.auxv...)
}
// SetAuxv sets the entire map of auxiliary vectors.
func (mm *MemoryManager) SetAuxv(auxv arch.Auxv) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.auxv = append(arch.Auxv(nil), auxv...)
}
// Executable returns the executable, if available.
//
// An additional reference will be taken in the case of a non-nil executable,
// which must be released by the caller.
func (mm *MemoryManager) Executable() *vfs.FileDescription {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
if mm.executable == nil {
return nil
}
mm.executable.IncRef()
return mm.executable
}
// SetExecutable sets the executable.
//
// This takes a reference on d.
func (mm *MemoryManager) SetExecutable(ctx context.Context, fd *vfs.FileDescription) {
mm.metadataMu.Lock()
// Grab a new reference.
fd.IncRef()
// Set the executable.
orig := mm.executable
mm.executable = fd
mm.metadataMu.Unlock()
// Release the old reference.
//
// Do this without holding the lock, since it may wind up doing some
// I/O to sync the dirent, etc.
if orig != nil {
orig.DecRef(ctx)
}
}
// VDSOSigReturn returns the address of vdso_sigreturn.
func (mm *MemoryManager) VDSOSigReturn() uint64 {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.vdsoSigReturnAddr
}
// SetVDSOSigReturn sets the address of vdso_sigreturn.
func (mm *MemoryManager) SetVDSOSigReturn(addr uint64) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.vdsoSigReturnAddr = addr
}
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