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SubjectRe: As 2.0 looms
Date
In article <m0uGULF-0005FhC@lightning.swansea.linux.org.uk>,
Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
>> Quick fix in .96, but breaks at least some versions of strace. Changed
>> in .98 - strace works again, but I think there may be a race condition
>> if read() passes the checks, sleeps on memcpy_tofs() due to a swap-in,
>> and the target process execs a setuid program in this time window.
>
>Thats bad because with an nfs program and a PC on the lan you can use for
>flooding it becomes quite a wide window.

No the target program must be PTRACE_ATTACHed and it must also be
in a _stopped_ state. So there is no way for it to continue
running and do an exec or whatever.

Mike.
--
+ Miquel van Smoorenburg + Cistron Internet Services + Living is a |
| miquels@cistron.nl (SP6) | Independent Dutch ISP | horizontal |
+ miquels@drinkel.ow.org + http://www.cistron.nl/ + fall +



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