140 lines
3.7 KiB
Go
140 lines
3.7 KiB
Go
// Copyright 2018 Google Inc.
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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 mm
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import (
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"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
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"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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)
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// ArgvStart returns the start of the application argument vector.
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//
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// There is no guarantee that this value is sensible w.r.t. ArgvEnd.
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func (mm *MemoryManager) ArgvStart() usermem.Addr {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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return mm.argv.Start
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}
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// SetArgvStart sets the start of the application argument vector.
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func (mm *MemoryManager) SetArgvStart(a usermem.Addr) {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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mm.argv.Start = a
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}
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// ArgvEnd returns the end of the application argument vector.
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//
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// There is no guarantee that this value is sensible w.r.t. ArgvStart.
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func (mm *MemoryManager) ArgvEnd() usermem.Addr {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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return mm.argv.End
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}
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// SetArgvEnd sets the end of the application argument vector.
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func (mm *MemoryManager) SetArgvEnd(a usermem.Addr) {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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mm.argv.End = a
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}
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// EnvvStart returns the start of the application environment vector.
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//
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// There is no guarantee that this value is sensible w.r.t. EnvvEnd.
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func (mm *MemoryManager) EnvvStart() usermem.Addr {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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return mm.envv.Start
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}
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// SetEnvvStart sets the start of the application environment vector.
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func (mm *MemoryManager) SetEnvvStart(a usermem.Addr) {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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mm.envv.Start = a
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}
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// EnvvEnd returns the end of the application environment vector.
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//
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// There is no guarantee that this value is sensible w.r.t. EnvvStart.
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func (mm *MemoryManager) EnvvEnd() usermem.Addr {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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return mm.envv.End
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}
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// SetEnvvEnd sets the end of the application environment vector.
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func (mm *MemoryManager) SetEnvvEnd(a usermem.Addr) {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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mm.envv.End = a
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}
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// Auxv returns the current map of auxiliary vectors.
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func (mm *MemoryManager) Auxv() arch.Auxv {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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return append(arch.Auxv(nil), mm.auxv...)
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}
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// SetAuxv sets the entire map of auxiliary vectors.
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func (mm *MemoryManager) SetAuxv(auxv arch.Auxv) {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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mm.auxv = append(arch.Auxv(nil), auxv...)
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}
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// Executable returns the executable, if available.
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//
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// An additional reference will be taken in the case of a non-nil executable,
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// which must be released by the caller.
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func (mm *MemoryManager) Executable() *fs.Dirent {
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mm.metadataMu.Lock()
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defer mm.metadataMu.Unlock()
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if mm.executable == nil {
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return nil
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}
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mm.executable.IncRef()
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return mm.executable
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}
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// SetExecutable sets the executable.
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//
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// This takes a reference on d.
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func (mm *MemoryManager) SetExecutable(d *fs.Dirent) {
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mm.metadataMu.Lock()
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// Grab a new reference.
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d.IncRef()
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// Set the executable.
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orig := mm.executable
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mm.executable = d
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mm.metadataMu.Unlock()
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// Release the old reference.
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//
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// Do this without holding the lock, since it may wind up doing some
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// I/O to sync the dirent, etc.
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if orig != nil {
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orig.DecRef()
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}
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}
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