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Fix epoll_ctl(2) regular files and dirs

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Linux behaves differently for regular files and dirs for poll(2)/select(2)
compared to epoll_ctl(2). The latter returns EPERM for file and dirs.
I've also changed host FDs to behave like the underlying FD in regards
to epoll to keep it compatible with docker.

Fixes #7134

PiperOrigin-RevId: 429412692
This commit is contained in:
Fabricio Voznika
2022-02-17 15:12:36 -08:00
committed by gVisor bot
parent a9b5dcd31b
commit dfcf798425
24 changed files with 184 additions and 15 deletions
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pkg/sentry/socket/netstack/netstack_vfs2.go
+5
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@@ -100,6 +100,11 @@ func (s *SocketVFS2) EventUnregister(e *waiter.Entry) {
s.socketOpsCommon.EventUnregister(e)
}
// Epollable implements FileDescriptionImpl.Epollable.
func (s *SocketVFS2) Epollable() bool {
return true
}
// Read implements vfs.FileDescriptionImpl.
func (s *SocketVFS2) Read(ctx context.Context, dst usermem.IOSequence, opts vfs.ReadOptions) (int64, error) {
// All flags other than RWF_NOWAIT should be ignored.