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From: "adhemerval.zanella at linaro dot org"
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To: glibc-bugs@sourceware.org
Subject: [Bug libc/28350] ping receives SIGABRT on lib32-qemux86-64 caused by
 recvmsg()
Date: Mon, 27 Sep 2021 18:15:12 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28350

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adhemerval.zanella at lina=
ro dot o
                   |                            |rg

--- Comment #2 from Adhemerval Zanella <adhemerval.zanella at linaro dot or=
g> ---
(In reply to Florian Weimer from comment #1)
> We need to disable recvmsg time64 emulation for time32 calls, it causes t=
oo
> many issues.

I don't think we need to resort on this change, the issue is in fact that
__convert_scm_timestamps does not correctly update the last cmsg.  With the
following patch it fixes the regression:

diff --git a/sysdeps/unix/sysv/linux/convert_scm_timestamps.c
b/sysdeps/unix/sysv/linux/convert_scm_timestamps.c
index 00c934c413..4da2c60799 100644
--- a/sysdeps/unix/sysv/linux/convert_scm_timestamps.c
+++ b/sysdeps/unix/sysv/linux/convert_scm_timestamps.c
@@ -55,7 +55,10 @@ __convert_scm_timestamps (struct msghdr *msg, socklen_t
msgsize)
        cmsg =3D CMSG_NXTHDR (msg, cmsg))
     {
       if (cmsg->cmsg_level !=3D SOL_SOCKET)
-       continue;
+       {
+         last =3D cmsg;
+         continue;
+       }

       switch (cmsg->cmsg_type)
        {

I will work on a patch along with a testcase.

--=20
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