Messages in this thread | | | Date | Mon, 27 Aug 2007 17:32:50 +0200 | From | Michael Kerrisk <> | Subject | Re: [PATCH] Reset current->pdeath_signal on SUID binary execution |
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Marcel,
>> 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.
I see your patch at:
http://article.gmane.org/gmane.linux.kernel/571635/match=pdeath%5fsignal+suid+binary+execution
But it's not clear to me in which 2.4.x and 2.6.x versions the change occurred (it isn't in 2.6.23-rc3 -- is it scheduled for 2.6.23-rc4?). Can you enlighten me?
Cheers,
Michael
>> 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 > >
-- Michael Kerrisk maintainer of Linux man pages Sections 2, 3, 4, 5, and 7
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