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Thu, 12 Dec 2019 16:41:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576168884; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=b6k1teDJ1Q7lOJlVrnMFV+zsUU1IFDongSuB3S+yHow=; b=e9H7Jn6XeNPxUbKABpZeTXIXS3uUTdK7Ub/Ck2Y0TSKHaM6vjwyFJixKt9g10OCi15QXOb bQ7iBnw/n6OsAv4BKvarMdsIQcdrgYZAbxz7eQQwSn8D7fg/XEj8tb6tlW2QCEaHcdrzZI 8x6AVulgUMXKeGAcawAuElOJwTZGVqs= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com Subject: [PATCH 081/104] virtiofsd: Prevent multiply running with same vhost_user_socket Date: Thu, 12 Dec 2019 16:38:41 +0000 Message-Id: <20191212163904.159893-82-dgilbert@redhat.com> In-Reply-To: <20191212163904.159893-1-dgilbert@redhat.com> References: <20191212163904.159893-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: VPaR8OBqP-i3HfFwWAAKcQ-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: Masayoshi Mizuma virtiofsd can run multiply even if the vhost_user_socket is same path. ]# ./virtiofsd -o vhost_user_socket=3D/tmp/vhostqemu -o source=3D/tmp/sha= re & [1] 244965 virtio_session_mount: Waiting for vhost-user socket connection... ]# ./virtiofsd -o vhost_user_socket=3D/tmp/vhostqemu -o source=3D/tmp/sha= re & [2] 244966 virtio_session_mount: Waiting for vhost-user socket connection... ]# The user will get confused about the situation and maybe the cause of the unexpected problem. So it's better to prevent the multiple running. Create a regular file under localstatedir directory to exclude the vhost_user_socket. To create and lock the file, use qemu_write_pidfile() because the API has some sanity checks and file lock. Signed-off-by: Masayoshi Mizuma Signed-off-by: Dr. David Alan Gilbert Applied fixes from Stefan's review and moved osdep include Signed-off-by: Stefan Hajnoczi --- tools/virtiofsd/fuse_lowlevel.c | 1 + tools/virtiofsd/fuse_virtio.c | 49 ++++++++++++++++++++++++++++++++- 2 files changed, 49 insertions(+), 1 deletion(-) diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowleve= l.c index 14c9d99374..b1ff684de9 100644 --- a/tools/virtiofsd/fuse_lowlevel.c +++ b/tools/virtiofsd/fuse_lowlevel.c @@ -17,6 +17,7 @@ =20 #include #include +#include #include #include #include diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c index 1b5d27fe16..7b22ae8d4f 100644 --- a/tools/virtiofsd/fuse_virtio.c +++ b/tools/virtiofsd/fuse_virtio.c @@ -13,11 +13,12 @@ =20 #include "qemu/osdep.h" #include "qemu/iov.h" -#include "fuse_virtio.h" +#include "qapi/error.h" #include "fuse_i.h" #include "standard-headers/linux/fuse.h" #include "fuse_misc.h" #include "fuse_opt.h" +#include "fuse_virtio.h" =20 #include #include @@ -733,6 +734,42 @@ int virtio_loop(struct fuse_session *se) return 0; } =20 +static void strreplace(char *s, char old, char new) +{ + for (; *s; ++s) { + if (*s =3D=3D old) { + *s =3D new; + } + } +} + +static bool fv_socket_lock(struct fuse_session *se) +{ + g_autofree gchar *sk_name =3D NULL; + g_autofree gchar *pidfile =3D NULL; + g_autofree gchar *dir =3D NULL; + Error *local_err =3D NULL; + + dir =3D qemu_get_local_state_pathname("run/virtiofsd"); + + if (g_mkdir_with_parents(dir, S_IRWXU) < 0) { + fuse_log(FUSE_LOG_ERR, "%s: Failed to create directory %s: %s", + __func__, dir, strerror(errno)); + return false; + } + + sk_name =3D g_strdup(se->vu_socket_path); + strreplace(sk_name, '/', '.'); + pidfile =3D g_strdup_printf("%s/%s.pid", dir, sk_name); + + if (!qemu_write_pidfile(pidfile, &local_err)) { + error_report_err(local_err); + return false; + } + + return true; +} + static int fv_create_listen_socket(struct fuse_session *se) { struct sockaddr_un un; @@ -748,6 +785,16 @@ static int fv_create_listen_socket(struct fuse_session= *se) return -1; } =20 + if (!strlen(se->vu_socket_path)) { + fuse_log(FUSE_LOG_ERR, "Socket path is empty\n"); + return -1; + } + + /* Check the vu_socket_path is already used */ + if (!fv_socket_lock(se)) { + return -1; + } + /* * Create the Unix socket to communicate with qemu * based on QEMU's vhost-user-bridge --=20 2.23.0