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Message-ID: <20160524220735.GA19259@wilbur.25thandClement.com>
Date: Tue, 24 May 2016 15:07:35 -0700
From: William Ahern <william@...handClement.com>
To: musl@...ts.openwall.com
Subject: sockaddr_storage and GCC 6.1
GCC 6.1 more aggressively decomposes aggregate assignments into a series of
scalar member assignments. This has uncovered an issue with glibc's layout
of struct sockaddr_storage, which has a padding hole from offsets 2 to 8,
precisely where .sin_port and .sin_addr are in struct sockaddr_in.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71120
musl shares this same issue. Specifically, the __ss_align member with an
8-byte alignment on LP64 archs. You can track the glibc resolution at
https://sourceware.org/bugzilla/show_bug.cgi?id=20111
Or not track it. Reasonable folks can disagree regarding many aspects of
this issue, but I thought it worthwhile to bring to people's attention.
- Bill
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