cf465e1c21
A few gcc9 related patches, and one to add the md-clear cpu feature. OBS-URL: https://build.opensuse.org/request/show/703018 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=470
96 lines
4.1 KiB
Diff
96 lines
4.1 KiB
Diff
From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= <berrange@redhat.com>
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Date: Wed, 1 May 2019 15:50:52 +0100
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Subject: sockets: avoid string truncation warnings when copying UNIX path
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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In file included from /usr/include/string.h:494,
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from include/qemu/osdep.h:101,
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from util/qemu-sockets.c:18:
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In function ‘strncpy’,
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inlined from ‘unix_connect_saddr.isra.0’ at util/qemu-sockets.c:925:5:
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/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ specified bound 108 equals destination size [-Wstringop-truncation]
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106 | return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
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| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In function ‘strncpy’,
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inlined from ‘unix_listen_saddr.isra.0’ at util/qemu-sockets.c:880:5:
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/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ specified bound 108 equals destination size [-Wstringop-truncation]
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106 | return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
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| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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We are already validating the UNIX socket path length earlier in
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the functions. If we save this string length when we first check
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it, then we can simply use memcpy instead of strcpy later, avoiding
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the gcc truncation warnings.
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Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
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Message-Id: <20190501145052.12579-1-berrange@redhat.com>
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Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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(cherry picked from commit 2d2023c3b99edb33ad4bb9791f70456ea1a1c049)
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Signed-off-by: Bruce Rogers <brogers@suse.com>
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---
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util/qemu-sockets.c | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
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index 9705051690..ba6335e71a 100644
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--- a/util/qemu-sockets.c
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+++ b/util/qemu-sockets.c
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@@ -830,6 +830,7 @@ static int unix_listen_saddr(UnixSocketAddress *saddr,
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int sock, fd;
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char *pathbuf = NULL;
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const char *path;
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+ size_t pathlen;
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sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
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if (sock < 0) {
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@@ -845,7 +846,8 @@ static int unix_listen_saddr(UnixSocketAddress *saddr,
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path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir);
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}
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- if (strlen(path) > sizeof(un.sun_path)) {
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+ pathlen = strlen(path);
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+ if (pathlen > sizeof(un.sun_path)) {
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error_setg(errp, "UNIX socket path '%s' is too long", path);
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error_append_hint(errp, "Path must be less than %zu bytes\n",
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sizeof(un.sun_path));
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@@ -877,7 +879,7 @@ static int unix_listen_saddr(UnixSocketAddress *saddr,
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memset(&un, 0, sizeof(un));
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un.sun_family = AF_UNIX;
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- strncpy(un.sun_path, path, sizeof(un.sun_path));
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+ memcpy(un.sun_path, path, pathlen);
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if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
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error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
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@@ -901,6 +903,7 @@ static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
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{
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struct sockaddr_un un;
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int sock, rc;
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+ size_t pathlen;
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if (saddr->path == NULL) {
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error_setg(errp, "unix connect: no path specified");
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@@ -913,7 +916,8 @@ static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
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return -1;
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}
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- if (strlen(saddr->path) > sizeof(un.sun_path)) {
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+ pathlen = strlen(saddr->path);
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+ if (pathlen > sizeof(un.sun_path)) {
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error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
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error_append_hint(errp, "Path must be less than %zu bytes\n",
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sizeof(un.sun_path));
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@@ -922,7 +926,7 @@ static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
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memset(&un, 0, sizeof(un));
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un.sun_family = AF_UNIX;
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- strncpy(un.sun_path, saddr->path, sizeof(un.sun_path));
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+ memcpy(un.sun_path, saddr->path, pathlen);
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/* connect to peer */
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do {
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