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Make padding in struct sockaddr_storage explicit [BZ #20111]

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This avoids aliasing issues with GCC 6 in -fno-strict-aliasing
mode.  (With implicit padding, not all data is copied.)

This change makes it explicit that struct sockaddr_storage is
only 126 bytes large on m68k (unlike elsewhere, where we end up
with the requested 128 bytes).  The new test case makes sure that
this does not happen on other architectures.
This commit is contained in:
Florian Weimer
2016-05-23 19:43:09 +02:00
parent d912d3a119
commit 3375cfafa7
9 changed files with 213 additions and 15 deletions
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5
bits/sockaddr.h
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@ -1,4 +1,4 @@
/* Definition of `struct sockaddr_*' common members. Generic/4.2 BSD version.
/* Definition of struct sockaddr_* common members and sizes, generic version.
Copyright (C) 1995-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -36,4 +36,7 @@ typedef unsigned short int sa_family_t;
#define __SOCKADDR_COMMON_SIZE (sizeof (unsigned short int))
/* Size of struct sockaddr_storage. */
#define _SS_SIZE 128
#endif /* bits/sockaddr.h */