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Fri, 28 Jun 2024 07:31:22 -0700 (PDT) From: Andrew Cooper To: Xen-devel Cc: Andrew Cooper , Frediano Ziglio , Anthony PERARD , Juergen Gross , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Oleksii Kurochko Subject: [PATCH for-4.19 2/3] tools/libxs: Fix CLOEXEC handling in get_socket() Date: Fri, 28 Jun 2024 15:31:15 +0100 Message-Id: <20240628143116.1044976-3-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240628143116.1044976-1-andrew.cooper3@citrix.com> References: <20240628143116.1044976-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1719585105935100001 get_socket() opens a socket, then uses fcntl() to set CLOEXEC. This is racy with exec(). Open the socket with SOCK_CLOEXEC. Use the same compatibility strategy as O_CLOEXEC on ancient versions of Linux. Reported-by: Frediano Ziglio Signed-off-by: Andrew Cooper --- CC: Anthony PERARD CC: Juergen Gross CC: Roger Pau Monn=C3=A9 CC: Frediano Ziglio CC: Oleksii Kurochko --- tools/libs/store/xs.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/tools/libs/store/xs.c b/tools/libs/store/xs.c index 037e79d98b58..11a766c50887 100644 --- a/tools/libs/store/xs.c +++ b/tools/libs/store/xs.c @@ -44,6 +44,10 @@ #define O_CLOEXEC 0 #endif =20 +#ifndef SOCK_CLOEXEC +#define SOCK_CLOEXEC 0 +#endif + struct xs_stored_msg { XEN_TAILQ_ENTRY(struct xs_stored_msg) list; struct xsd_sockmsg hdr; @@ -207,16 +211,14 @@ int xs_fileno(struct xs_handle *h) static int get_socket(const char *connect_to) { struct sockaddr_un addr; - int sock, saved_errno, flags; + int sock, saved_errno; =20 - sock =3D socket(PF_UNIX, SOCK_STREAM, 0); + sock =3D socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0); if (sock < 0) return -1; =20 - if ((flags =3D fcntl(sock, F_GETFD)) < 0) - goto error; - flags |=3D FD_CLOEXEC; - if (fcntl(sock, F_SETFD, flags) < 0) + /* Compat for non-SOCK_CLOEXEC environments. Racy. */ + if (!SOCK_CLOEXEC && !set_cloexec(sock)) goto error; =20 addr.sun_family =3D AF_UNIX; --=20 2.39.2