From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Mon, 24 Apr 2023 22:14:58 +0000 (+0200)
Subject: hurd: Do not take any flag from the CMSG_DATA
X-Git-Tag: glibc-2.38~339
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=323fe6a1a9204e2126df63cb81a88831d1cdeaf5;p=thirdparty%2Fglibc.git

hurd: Do not take any flag from the CMSG_DATA

As fixed in 0822e3552a78 ("hurd: Don't pass FD_CLOEXEC in CMSG_DATA"),
senders currently don't have any flag to pass.  We shouldn't blindly take
random flags that senders could be erroneously giving us.
---

diff --git a/sysdeps/mach/hurd/recvmsg.c b/sysdeps/mach/hurd/recvmsg.c
index e06b0fe3ba3..4254dca6271 100644
--- a/sysdeps/mach/hurd/recvmsg.c
+++ b/sysdeps/mach/hurd/recvmsg.c
@@ -201,8 +201,10 @@ __libc_recvmsg (int fd, struct msghdr *message, int flags)
 	    err = reauthenticate (ports[i], &newports[newfds]);
 	    if (err)
 	      goto cleanup;
+	    /* We do not currently take any flag from the sender.  */
 	    fds[j] = opened_fds[newfds] = _hurd_intern_fd (newports[newfds],
-							   fds[j] | fd_flags,
+							   (fds[j] & 0)
+							   | fd_flags,
 							   0);
 	    if (fds[j] == -1)
 	      {