Oleg Nesterov [oleg@xxxxxxxxxx] wrote:
| On 06/25, Sukadev Bhattiprolu wrote:
| >
| > Oleg Nesterov [oleg@xxxxxxxxxx] wrote:
| > | On 06/25, Sukadev Bhattiprolu wrote:
| > | >
| > | > Louis Rilling [Louis.Rilling@xxxxxxxxxxx] wrote:
| > | > | - proc_pid_readdir():
| > | > | Needs similar check and protection to proc_pid_lookup(), but there is another
| > | > | issue: next_tgid() can find a dying task:
| > | >
| > | > Hmm, I thought proc_pid_readdir() would be a problem too but convinced myself
| > | > that it would not - since a process running proc_pid_readdir() would have
| > | > a reference to the pid namespace,
| > |
| > | Where does this reference comes from ?
| >
| > Caller of proc_pid_readdir() would be living in the same pid namespace right ?
|
| Afaics, in general not.
|
| Suppose that we do something like
|
| if (!clone(CLONE_NEWPID)) {
| mount("none", "/SUB_PROC", "proc", 0, NULL);
| exit();
| }
|
| After that /SUB_PROC/ still exists, one can do "ls /SUB_PROC/".
Yes, I see it now. Thanks,
Sukadev
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