Date: Mon, 17 Sep 2001 16:15:40 -0500 From: Alfred Perlstein <bright@mu.org> To: Matt Dillon <dillon@earth.backplane.com> Cc: hackers@FreeBSD.org Subject: Re: bug in sshd - signal during free() Message-ID: <20010917161540.A968@elvis.mu.org> In-Reply-To: <200109172104.f8HL45641959@earth.backplane.com>; from dillon@earth.backplane.com on Mon, Sep 17, 2001 at 02:04:05PM -0700 References: <200109172032.f8HKW6M41638@earth.backplane.com> <20010917160103.Z968@elvis.mu.org> <200109172104.f8HL45641959@earth.backplane.com>
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* Matt Dillon <dillon@earth.backplane.com> [010917 16:04] wrote: > > : > :* Matt Dillon <dillon@earth.backplane.com> [010917 15:32] wrote: > :> sshd died on one of our machines today. The traceback seems to > :> indicate that a signal is interrupting a free(). I'm going to > :> play with the code a bit to see if there's an easy fix. > :> > :> This bug can't occur very often... the key regeneration signal > :> has to occur *just* as sshd is trying to free() something. > : > :The bug seems more likely to be caused by use of unsafe functions > :in a signal handler. > : > :I'm really suprised that the OpenSSH team didn't slap whomever decided > :to do so much processing within a signal handler silly. > > It's funny... they had an XXX comment in there so obviously someone > was a little jittery about it. I think they just didn't realize that > a malloc() might occur inside the signal handler or they would have > fixed it long ago. > > UNIX signals suck. Any async notification would require the same amount of care. Most programmers suck. :) -- -Alfred Perlstein [alfred@freebsd.org] 'Instead of asking why a piece of software is using "1970s technology," start asking why software is ignoring 30 years of accumulated wisdom.' To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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