Date: Wed, 23 May 2001 18:58:07 +0300 From: Jarno Huuskonen <Jarno.Huuskonen@....fi> To: owl-users@...ts.openwall.com Subject: glibc resolver dns query ids I noticed that you have added a patch for glibc-2.1.3 to use more random dns query ids (the same patch you have for bind-4.9.x ?). Have you done any tests to see if the patch adds any performance penalties etc. ? (My rough guess would be that any penalties will be very minimal). (Also have you tested bind-8.2.3 with 'use-id-pool yes;' to see if it uses decent query id's and how it compares to your res_randomid patch ?) Have you done (or considered) a similar patch for glibc __gen_tempname ? Here's part of the __gen_tempname code (looks similar to the res_randomid): value += ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ __getpid (); (I guess it couldn't hurt if __gen_tempname would accept more than six X's). This probably isn't very interesting but might help some (closed source) programs (if you have to use them) that use mktemp/tempnam with or without O_EXCL. Have you considered using something like prngd as a random source ? OpenSSH seems to recommend prngd. -Jarno -- Jarno Huuskonen - System Administrator | Jarno.Huuskonen@....fi University of Kuopio - Computer Center | Work: +358 17 162822 PO BOX 1627, 70211 Kuopio, Finland | Mobile: +358 40 5388169
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