Date: Sun, 27 Jan 2002 23:43:44 +0100 From: Volker Stolz <stolz@hyperion.informatik.rwth-aachen.de> To: freebsd-gnats-submit@freebsd.org Cc: alpha@freebsd.org Subject: Re: alpha/34232: rpc.statd throws alignment errors Message-ID: <20020127234344.A13308@i2.informatik.rwth-aachen.de> In-Reply-To: <200201271730.g0RHU3N67579@freefall.freebsd.org> References: <200201271730.g0RHU3N67579@freefall.freebsd.org>
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Sigh. Okay. Here's my first take at this sucker:
Some interface addresses have 26 bytes in size, which causes
the alignment error. The attached fix will solve my rpc.statd
problem and hopefully a couple of things more (I saw dhclient
going mad on me earlier, but this seems to have been fixed now,
too). The obvious disadvantage: Each time, the ioctl will copy
up to 7(6?) bytes of garbage, but we can probably live with
that :-) Should I hunt down the place where this ifa->ifa_addr is
initialized and add the padding right then when the interface
(address) is created? This patch seems to be closely related to
the ifconfig patch.
Another question: Can I safely replace
memcpy(&ifreq, ifr, sizeof(ifreq));
with
ifreq=*ifr;
in lib/libc/rpc/get_myaddress.c? I know that this kind of
assignment has been non-standard, but I'd like to know if
this will safely work today. I did check, it works fine.
It will de-obfuscate the code and even eliminate one warning :-)
--- sys/net/if.c.orig Sun Jan 27 23:25:54 2002
+++ sys/net/if.c Sun Jan 27 23:12:54 2002
@@ -1298,6 +1298,7 @@
for ( ; space > sizeof (ifr) && ifa;
ifa = ifa->ifa_link.tqe_next) {
register struct sockaddr *sa = ifa->ifa_addr;
+ sa->sa_len = _ALIGN(sa->sa_len);
if (curproc->p_prison && prison_if(curproc, sa))
continue;
addrs++;
--
Wonderful \hbox (0.80312pt too nice) in paragraph at lines 16--18
Volker Stolz * stolz@i2.informatik.rwth-aachen.de
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