Alan Buxey, 2010-04-19 16:43: >> Maybe the info about /proc/sys/fs/suid_dumpable should be added to >> doc/bugs... > to quote the man page: > /proc/sys/fs/suid_dumpable (since Linux 2.6.13) ... > i dont think this got enough coverage in most information outlets..in fact > 2.6.13 has been around for a while but today was the first time i learnt of > that behaviour.
I agree, even though it's mentioned in the CORE(5) man page. > maybe FreeRADIUS code updated to detect this value...and if its set to 0 > then it could mention it in the debug output? ;-) Maybe, but with calling prctl(PR_SET_DUMPABLE, 1) this should not be necessary any more. I tried this with a small test program and it worked as specified, but still I won't get a core dump of the FR process unless I set suid_dumpable to 1. So after some debugging I got to the root cause of this: The process's dumpable flag is reset every time the UID is changed. FR does this several times with fr_suid_up() and fr_suid_down() after switch_users() is run, e.g. in listen_bind(). So I guess we have to change the fr_suid_* functions to always set the dumpable flag after setting the uid. btw, I wonder why is prctl() is not called when debug_flag is set. I would have thought that one would want to get a core dump especially when running in debug mode. - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html
