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294 lines
11 KiB
294 lines
11 KiB
commit 3375cfafa7961c6ae0e509c31c3b3cef9ad1f03d |
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Author: Florian Weimer <fweimer@redhat.com> |
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Date: Mon May 23 19:43:09 2016 +0200 |
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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 |
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mode. (With implicit padding, not all data is copied.) |
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This change makes it explicit that struct sockaddr_storage is |
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only 126 bytes large on m68k (unlike elsewhere, where we end up |
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with the requested 128 bytes). The new test case makes sure that |
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this does not happen on other architectures. |
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[modified by DJ Delorie <dj@redhat.com> for RHEL] |
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diff -rupN a/bits/sockaddr.h b/bits/sockaddr.h |
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--- a/bits/sockaddr.h 2012-12-24 22:02:13.000000000 -0500 |
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+++ b/bits/sockaddr.h 2017-03-01 16:54:46.606261055 -0500 |
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@@ -1,4 +1,4 @@ |
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-/* Definition of `struct sockaddr_*' common members. Generic/4.2 BSD version. |
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+/* Definition of struct sockaddr_* common members and sizes, generic version. |
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Copyright (C) 1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc. |
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This file is part of the GNU C Library. |
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@@ -36,4 +36,7 @@ typedef unsigned short int sa_family_t; |
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#define __SOCKADDR_COMMON_SIZE (sizeof (unsigned short int)) |
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+/* Size of struct sockaddr_storage. */ |
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+#define _SS_SIZE 128 |
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+ |
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#endif /* bits/sockaddr.h */ |
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diff -rupN a/bits/socket.h b/bits/socket.h |
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--- a/bits/socket.h 2012-12-24 22:02:13.000000000 -0500 |
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+++ b/bits/socket.h 2017-03-01 16:38:24.861208175 -0500 |
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@@ -133,20 +133,20 @@ struct sockaddr |
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/* Structure large enough to hold any socket address (with the historical |
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- exception of AF_UNIX). We reserve 128 bytes. */ |
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+ exception of AF_UNIX). */ |
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#if ULONG_MAX > 0xffffffff |
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# define __ss_aligntype __uint64_t |
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#else |
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# define __ss_aligntype __uint32_t |
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#endif |
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-#define _SS_SIZE 128 |
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-#define _SS_PADSIZE (_SS_SIZE - (2 * sizeof (__ss_aligntype))) |
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+#define _SS_PADSIZE \ |
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+ (_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype)) |
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struct sockaddr_storage |
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{ |
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__SOCKADDR_COMMON (ss_); /* Address family, etc. */ |
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- __ss_aligntype __ss_align; /* Force desired alignment. */ |
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char __ss_padding[_SS_PADSIZE]; |
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+ __ss_aligntype __ss_align; /* Force desired alignment. */ |
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}; |
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diff -rupN a/inet/Makefile b/inet/Makefile |
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--- a/inet/Makefile 2017-03-01 16:06:12.000000000 -0500 |
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+++ b/inet/Makefile 2017-03-01 16:55:21.919485376 -0500 |
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@@ -51,7 +51,7 @@ aux := check_pf check_native ifreq |
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tests := htontest test_ifindex tst-ntoa tst-ether_aton tst-network \ |
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tst-gethnm test-ifaddrs bug-if1 test-inet6_opt tst-ether_line \ |
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- tst-getni1 tst-getni2 tst-inet6_rth tst-checks tst-deadline |
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+ tst-getni1 tst-getni2 tst-inet6_rth tst-checks tst-deadline tst-sockaddr |
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# tst-deadline must be linked statically so that we can access |
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# internal functions. |
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@@ -89,6 +89,8 @@ CFLAGS-either_hton.c = -fexceptions |
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CFLAGS-getnetgrent.c = -fexceptions |
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CFLAGS-getnetgrent_r.c = -fexceptions |
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+CFLAGS-tst-sockaddr.c = -fno-strict-aliasing |
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+ |
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endif |
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ifeq ($(build-static-nss),yes) |
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diff -rupN a/inet/tst-sockaddr.c b/inet/tst-sockaddr.c |
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--- a/inet/tst-sockaddr.c 1969-12-31 19:00:00.000000000 -0500 |
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+++ b/inet/tst-sockaddr.c 2017-03-01 16:38:24.869208278 -0500 |
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@@ -0,0 +1,125 @@ |
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+/* Tests for socket address type definitions. |
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+ Copyright (C) 2016 Free Software Foundation, Inc. |
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+ This file is part of the GNU C Library. |
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+ |
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+ The GNU C Library is free software; you can redistribute it and/or |
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+ modify it under the terms of the GNU Lesser General Public License as |
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+ published by the Free Software Foundation; either version 2.1 of the |
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+ License, or (at your option) any later version. |
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+ |
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+ The GNU C Library is distributed in the hope that it will be useful, |
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of |
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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+ Lesser General Public License for more details. |
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+ |
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+ You should have received a copy of the GNU Lesser General Public |
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+ License along with the GNU C Library; see the file COPYING.LIB. If |
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+ not, see <http://www.gnu.org/licenses/>. */ |
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+ |
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+#include <netinet/in.h> |
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+#include <stdbool.h> |
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+#include <stddef.h> |
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+#include <stdio.h> |
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+#include <stdlib.h> |
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+#include <string.h> |
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+#include <sys/socket.h> |
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+#include <sys/un.h> |
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+ |
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+/* This is a copy of the previous definition of struct |
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+ sockaddr_storage. It is not equal to the old value of _SS_SIZE |
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+ (128) on all architectures. We must stay compatible with the old |
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+ definition. */ |
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+ |
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+#define OLD_REFERENCE_SIZE 128 |
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+#define OLD_PADSIZE (OLD_REFERENCE_SIZE - (2 * sizeof (__ss_aligntype))) |
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+struct sockaddr_storage_old |
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+ { |
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+ __SOCKADDR_COMMON (old_); |
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+ __ss_aligntype old_align; |
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+ char old_padding[OLD_PADSIZE]; |
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+ }; |
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+ |
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+static bool errors; |
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+ |
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+static void |
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+check (bool ok, const char *message) |
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+{ |
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+ if (!ok) |
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+ { |
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+ printf ("error: failed check: %s\n", message); |
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+ errors = true; |
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+ } |
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+} |
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+ |
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+static int |
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+do_test (void) |
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+{ |
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+ check (OLD_REFERENCE_SIZE >= _SS_SIZE, |
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+ "old target size is not smaller than actual size"); |
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+ check (sizeof (struct sockaddr_storage_old) |
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+ == sizeof (struct sockaddr_storage), |
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+ "old and new sizes match"); |
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+ check (__alignof (struct sockaddr_storage_old) |
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+ == __alignof (struct sockaddr_storage), |
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+ "old and new alignment matches"); |
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+ check (offsetof (struct sockaddr_storage_old, old_family) |
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+ == offsetof (struct sockaddr_storage, ss_family), |
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+ "old and new family offsets match"); |
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+ check (sizeof (struct sockaddr_storage) == _SS_SIZE, |
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+ "struct sockaddr_storage size"); |
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+ |
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+ /* Check for lack of holes in the struct definition. */ |
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+ check (offsetof (struct sockaddr_storage, __ss_padding) |
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+ == __SOCKADDR_COMMON_SIZE, |
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+ "implicit padding before explicit padding"); |
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+ check (offsetof (struct sockaddr_storage, __ss_align) |
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+ == __SOCKADDR_COMMON_SIZE |
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+ + sizeof (((struct sockaddr_storage) {}).__ss_padding), |
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+ "implicit padding before explicit padding"); |
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+ |
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+ /* Check for POSIX compatibility requirements between struct |
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+ sockaddr_storage and struct sockaddr_un. */ |
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+ check (sizeof (struct sockaddr_storage) >= sizeof (struct sockaddr_un), |
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+ "sockaddr_storage is at least as large as sockaddr_un"); |
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+ check (__alignof (struct sockaddr_storage) |
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+ >= __alignof (struct sockaddr_un), |
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+ "sockaddr_storage is at least as aligned as sockaddr_un"); |
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+ check (offsetof (struct sockaddr_storage, ss_family) |
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+ == offsetof (struct sockaddr_un, sun_family), |
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+ "family offsets match"); |
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+ |
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+ /* Check that the compiler preserves bit patterns in aggregate |
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+ copies. Based on <https://gcc.gnu.org/PR71120>. */ |
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+ check (sizeof (struct sockaddr_storage) >= sizeof (struct sockaddr_in), |
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+ "sockaddr_storage is at least as large as sockaddr_in"); |
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+ { |
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+ struct sockaddr_storage addr; |
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+ memset (&addr, 0, sizeof (addr)); |
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+ { |
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+ struct sockaddr_in *sinp = (struct sockaddr_in *)&addr; |
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+ sinp->sin_family = AF_INET; |
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+ sinp->sin_addr.s_addr = htonl (INADDR_LOOPBACK); |
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+ sinp->sin_port = htons (80); |
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+ } |
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+ struct sockaddr_storage copy; |
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+ copy = addr; |
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+ |
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+ struct sockaddr_storage *p = malloc (sizeof (*p)); |
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+ if (p == NULL) |
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+ { |
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+ printf ("error: malloc: %m\n"); |
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+ return 1; |
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+ } |
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+ *p = copy; |
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+ const struct sockaddr_in *sinp = (const struct sockaddr_in *)p; |
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+ check (sinp->sin_family == AF_INET, "sin_family"); |
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+ check (sinp->sin_addr.s_addr == htonl (INADDR_LOOPBACK), "sin_addr"); |
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+ check (sinp->sin_port == htons (80), "sin_port"); |
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+ free (p); |
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+ } |
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+ |
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+ return errors; |
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+} |
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+ |
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+#define TEST_FUNCTION do_test () |
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+#include "../test-skeleton.c" |
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diff -rupN a/sysdeps/mach/hurd/bits/socket.h b/sysdeps/mach/hurd/bits/socket.h |
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--- a/sysdeps/mach/hurd/bits/socket.h 2012-12-24 22:02:13.000000000 -0500 |
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+++ b/sysdeps/mach/hurd/bits/socket.h 2017-03-01 16:38:24.873208329 -0500 |
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@@ -156,20 +156,20 @@ struct sockaddr |
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/* Structure large enough to hold any socket address (with the historical |
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- exception of AF_UNIX). We reserve 128 bytes. */ |
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+ exception of AF_UNIX). */ |
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#if ULONG_MAX > 0xffffffff |
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# define __ss_aligntype __uint64_t |
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#else |
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# define __ss_aligntype __uint32_t |
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#endif |
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-#define _SS_SIZE 128 |
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-#define _SS_PADSIZE (_SS_SIZE - (2 * sizeof (__ss_aligntype))) |
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+#define _SS_PADSIZE \ |
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+ (_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype)) |
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struct sockaddr_storage |
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{ |
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__SOCKADDR_COMMON (ss_); /* Address family, etc. */ |
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- __ss_aligntype __ss_align; /* Force desired alignment. */ |
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char __ss_padding[_SS_PADSIZE]; |
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+ __ss_aligntype __ss_align; /* Force desired alignment. */ |
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}; |
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diff -rupN a/sysdeps/unix/bsd/bsd4.4/bits/sockaddr.h b/sysdeps/unix/bsd/bsd4.4/bits/sockaddr.h |
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--- a/sysdeps/unix/bsd/bsd4.4/bits/sockaddr.h 2012-12-24 22:02:13.000000000 -0500 |
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+++ b/sysdeps/unix/bsd/bsd4.4/bits/sockaddr.h 2017-03-01 17:30:34.962261748 -0500 |
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@@ -37,6 +37,9 @@ typedef unsigned char sa_family_t; |
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#define __SOCKADDR_COMMON_SIZE (2 * sizeof (unsigned char)) |
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+/* Size of struct sockaddr_storage. */ |
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+#define _SS_SIZE 128 |
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+ |
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#define _HAVE_SA_LEN 1 /* We have the sa_len field. */ |
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#endif /* bits/sockaddr.h */ |
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diff -rupN a/sysdeps/unix/bsd/bsd4.4/bits/socket.h b/sysdeps/unix/bsd/bsd4.4/bits/socket.h |
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--- a/sysdeps/unix/bsd/bsd4.4/bits/socket.h 2012-12-24 22:02:13.000000000 -0500 |
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+++ b/sysdeps/unix/bsd/bsd4.4/bits/socket.h 2017-03-01 17:31:23.790246360 -0500 |
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@@ -142,14 +142,13 @@ struct sockaddr |
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#else |
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# define __ss_aligntype __uint32_t |
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#endif |
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-#define _SS_SIZE 128 |
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-#define _SS_PADSIZE (_SS_SIZE - (2 * sizeof (__ss_aligntype))) |
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+#define _SS_PADSIZE (_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype)) |
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struct sockaddr_storage |
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{ |
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__SOCKADDR_COMMON (ss_); /* Address family, etc. */ |
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- __ss_aligntype __ss_align; /* Force desired alignment. */ |
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char __ss_padding[_SS_PADSIZE]; |
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+ __ss_aligntype __ss_align; /* Force desired alignment. */ |
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}; |
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diff -rupN a/sysdeps/unix/sysv/linux/bits/socket.h b/sysdeps/unix/sysv/linux/bits/socket.h |
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--- a/sysdeps/unix/sysv/linux/bits/socket.h 2017-03-01 16:06:12.000000000 -0500 |
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+++ b/sysdeps/unix/sysv/linux/bits/socket.h 2017-03-01 16:38:26.993235460 -0500 |
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@@ -155,16 +155,16 @@ struct sockaddr |
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/* Structure large enough to hold any socket address (with the historical |
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- exception of AF_UNIX). We reserve 128 bytes. */ |
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+ exception of AF_UNIX). */ |
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#define __ss_aligntype unsigned long int |
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-#define _SS_SIZE 128 |
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-#define _SS_PADSIZE (_SS_SIZE - (2 * sizeof (__ss_aligntype))) |
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+#define _SS_PADSIZE \ |
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+ (_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype)) |
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struct sockaddr_storage |
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{ |
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__SOCKADDR_COMMON (ss_); /* Address family, etc. */ |
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- __ss_aligntype __ss_align; /* Force desired alignment. */ |
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char __ss_padding[_SS_PADSIZE]; |
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+ __ss_aligntype __ss_align; /* Force desired alignment. */ |
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};
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