Re: [PATCH] Reset current->pdeath_signal on SUID binary execution

[Marcel Holtmann]

Hi,

> the attached patch fixes a flaw in the "parent process death signal"
> when executing SUID binaries. An unprivileged user may send arbitrary
> signal to a child process even if it is running with higher privileges.
> 
> The idea to fix this issue is to reset pdeath_signal not only on fork,
> but also on the execution of a SUID binary.
> 
> Michael, if we fix it this way, then the prctl() manual page should
> reflect that behavior.

the patch has been merged into 2.4 and 2.6, so the manual page needs an
update at some point.

> From comments it seems that we have to also reset pdeath_signal inside
> LSM when it comes to capability-raised executes, but I must admit that I
> got lost there.

No further comments for this one? I am not familiar enough with it.

Regards

Marcel


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