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Implement /proc/thread-self

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Closes #68

PiperOrigin-RevId: 200725401
Change-Id: I4827009b8aee89d22887c3af67291ccf7058d420
This commit is contained in:
Fabricio Voznika
2018-06-15 09:18:00 -07:00
committed by Shentubot
parent 1eb1bf8670
commit 119a302ceb
1 changed files with 32 additions and 2 deletions
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pkg/sentry/fs/proc/proc.go
+32 -2
View File
@@ -111,6 +111,13 @@ func (p *proc) newSelf(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
return newFile(s, msrc, fs.Symlink, nil)
}
// newThreadSelf returns a new "threadSelf" node.
func (p *proc) newThreadSelf(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
s := &threadSelf{pidns: p.pidns}
s.InitSymlink(ctx, fs.RootOwner, "")
return newFile(s, msrc, fs.Symlink, nil)
}
// newStubProcFsFile returns a procfs file with constant contents.
func (p *proc) newStubProcFSFile(ctx context.Context, msrc *fs.MountSource, c []byte) *fs.Inode {
u := &stubProcFSFile{
@@ -134,6 +141,28 @@ func (s *self) Readlink(ctx context.Context, inode *fs.Inode) (string, error) {
return "", ramfs.ErrInvalidOp
}
// threadSelf is more magical than "self" link.
type threadSelf struct {
ramfs.Symlink
pidns *kernel.PIDNamespace
}
// Readlink implements fs.InodeOperations.Readlink.
func (s *threadSelf) Readlink(ctx context.Context, inode *fs.Inode) (string, error) {
if t := kernel.TaskFromContext(ctx); t != nil {
tgid := s.pidns.IDOfThreadGroup(t.ThreadGroup())
tid := s.pidns.IDOfTask(t)
if tid == 0 || tgid == 0 {
return "", ramfs.ErrNotFound
}
return fmt.Sprintf("%d/task/%d", tgid, tid), nil
}
// Who is reading this link?
return "", ramfs.ErrInvalidOp
}
// Lookup loads an Inode at name into a Dirent.
func (p *proc) Lookup(ctx context.Context, dir *fs.Inode, name string) (*fs.Dirent, error) {
// Is it one of the static ones?
@@ -151,8 +180,9 @@ func (p *proc) Lookup(ctx context.Context, dir *fs.Inode, name string) (*fs.Dire
}
return p.newNetDir(ctx, dir.MountSource)
},
"self": func() *fs.Inode { return p.newSelf(ctx, dir.MountSource) },
"sys": func() *fs.Inode { return p.newSysDir(ctx, dir.MountSource) },
"self": func() *fs.Inode { return p.newSelf(ctx, dir.MountSource) },
"sys": func() *fs.Inode { return p.newSysDir(ctx, dir.MountSource) },
"thread-self": func() *fs.Inode { return p.newThreadSelf(ctx, dir.MountSource) },
}
if nf, ok := nfs[name]; ok {
return fs.NewDirent(nf(), name), nil