From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44573) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YXPvX-0006rB-7H for qemu-devel@nongnu.org; Mon, 16 Mar 2015 03:59:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YXPvT-0004IL-3u for qemu-devel@nongnu.org; Mon, 16 Mar 2015 03:59:07 -0400 Received: from e28smtp05.in.ibm.com ([122.248.162.5]:41672) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YXPvS-0004Hk-Fo for qemu-devel@nongnu.org; Mon, 16 Mar 2015 03:59:03 -0400 Received: from /spool/local by e28smtp05.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 16 Mar 2015 13:28:58 +0530 From: "Aneesh Kumar K.V" In-Reply-To: <1426244956-5316-1-git-send-email-zhaoshenglong@huawei.com> References: <1426244956-5316-1-git-send-email-zhaoshenglong@huawei.com> Date: Mon, 16 Mar 2015 13:28:51 +0530 Message-ID: <87egopmkzo.fsf@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain Subject: Re: [Qemu-devel] [PATCH] hw/9pfs/virtio-9p-proxy: Fix possible overflow List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Shannon Zhao , qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, hangaohuai@huawei.com, qemu-trivial@nongnu.org, mjt@tls.msk.ru, peter.huangpeng@huawei.com, shannon.zhao@linaro.org, pbonzini@redhat.com Shannon Zhao writes: > It's detected by coverity. As max of sockaddr_un.sun_path is > sizeof(helper.sun_path), should check the length of source > and use strncpy instead of strcpy. > > Signed-off-by: Shannon Zhao > Signed-off-by: Shannon Zhao > --- > hw/9pfs/virtio-9p-proxy.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/hw/9pfs/virtio-9p-proxy.c b/hw/9pfs/virtio-9p-proxy.c > index 59c7445..fb1ab7b 100644 > --- a/hw/9pfs/virtio-9p-proxy.c > +++ b/hw/9pfs/virtio-9p-proxy.c > @@ -1102,12 +1102,13 @@ static int connect_namedsocket(const char *path) > int sockfd, size; > struct sockaddr_un helper; > > + g_assert(strlen(path) < sizeof(helper.sun_path)); Since we are doing this from within Qemu, I did the below and folded that into other sockadd_un.sun_path size checking patch. diff --git a/hw/9pfs/virtio-9p-proxy.c b/hw/9pfs/virtio-9p-proxy.c index 6bb191ee6ab8..71b6198bbd22 100644 --- a/hw/9pfs/virtio-9p-proxy.c +++ b/hw/9pfs/virtio-9p-proxy.c @@ -1100,6 +1100,10 @@ static int connect_namedsocket(const char *path) int sockfd, size; struct sockaddr_un helper; + if (strlen(path) >= sizeof(helper.sun_path)) { + fprintf(stderr, "Socket name too large\n"); + return -1; + } sockfd = socket(AF_UNIX, SOCK_STREAM, 0); if (sockfd < 0) { fprintf(stderr, "failed to create socket: %s\n", strerror(errno)); Let me know if that is ok for you. > sockfd = socket(AF_UNIX, SOCK_STREAM, 0); > if (sockfd < 0) { > fprintf(stderr, "failed to create socket: %s\n", strerror(errno)); > return -1; > } > - strcpy(helper.sun_path, path); > + strncpy(helper.sun_path, path, sizeof(helper.sun_path)); > helper.sun_family = AF_UNIX; > size = strlen(helper.sun_path) + sizeof(helper.sun_family); > if (connect(sockfd, (struct sockaddr *)&helper, size) < 0) { > -- > 1.8.3.1