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http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=434140
unaligned access in ntp code triggers SIGBUS on sparc, others
Frans Pop's testing of rdate on sparc reveals that the ntp option fails with
a SIGBUS, because the ntp code performs an unaligned 64-bit read when from
the packet data. This definitely affects sparc, and will also affect a
number of other archs, either causing an unnecessary performance penalty or
causing the same SIGBUS.
Steve Langasek <vorlon@debian.org> Sat, 21 Jul 2007 13:51:43 -0700
Index: rdate-1.2/src/ntp.c
===================================================================
--- rdate-1.2.orig/src/ntp.c
+++ rdate-1.2/src/ntp.c
@@ -429,7 +429,7 @@ unpack_ntp(struct ntp_data *data, u_char
data->transmit = d / NTP_SCALE;
/* See write_packet for why this isn't an endian problem. */
- data->recvck = *(u_int64_t *)(packet + NTP_ORIGINATE);
+ memcpy(&data->recvck,packet+NTP_ORIGINATE,8);
}
/*
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