Messages in this thread |  | | Date | Mon, 26 Aug 2002 08:58:25 -0600 (MDT) | From | Thunder from the hill <> | Subject | Re: problems with changing UID/GID |
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Hi,
On Mon, 26 Aug 2002, Zheng Jian-Ming wrote: > POSIX states that the credentials (uid, gid, capabilities, etc.) are > process-wide. So when one thread within the process changes some part > of the credentials, all threads see the change. > > But, the credentials are per-task in Linux, so it's possible to have > two tasks in a process running under different UIDs. > > It may have problems when we change UID/GID in one task within the > thread group. > > How to deal with it? Will Linux kernel move credentials into a shared > structure?
There was some piece of work on that, done by Dave McCracken. But it lately had this "little security hole you could drive a big yellow truck with flashlights on through" problem...
I personally like the task->cred->cr_uid, etc. approach. Helps a lot.
Thunder -- --./../...-/. -.--/---/..-/.-./..././.-../..-. .---/..-/.../- .- --/../-./..-/-/./--..-- ../.----./.-../.-.. --./../...-/. -.--/---/..- .- -/---/--/---/.-./.-./---/.--/.-.-.- --./.-/-.../.-./.././.-../.-.-.-
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