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Re: Weird kernel 2.6.17.[67] behaviour

On 27/07/06, Sébastien Bernard <seb@frankengul.org> wrote:
seb@frankengul.org a écrit :
> I got a perfectly workable kernel using mkinitramfs on my U60.
> Can you shed some lights on this dark corner of linux ?
>       Seb

I can't shed any more light on it, but I can look too :o)

The original mailing of the patch to the list is below:

The prctl() system call should never allow to set "dumpable" to the
value 2. Especially not for non-privileged users.

This can be split into three cases:
 1) running as root -- then core dumps will already be done as root,
    and so prctl(PR_SET_DUMPABLE, 2) is not useful
 2) running as non-root w/setuid-to-root -- this is the debatable case
 3) running as non-root w/setuid-to-non-root -- then you definitely
    do NOT want "dumpable" to get set to 2 because you have the
    privilege escalation vulnerability

Is it that something else is misbehaving and trying to dump core as root?

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