[Bug libc/28350] ping receives SIGABRT on lib32-qemux86-64 caused by recvmsg()

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28350

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg

--- Comment #2 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Florian Weimer from comment #1)
> We need to disable recvmsg time64 emulation for time32 calls, it causes too
> 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 = CMSG_NXTHDR (msg, cmsg))
     {
       if (cmsg->cmsg_level != SOL_SOCKET)
-       continue;
+       {
+         last = cmsg;
+         continue;
+       }

       switch (cmsg->cmsg_type)
        {

I will work on a patch along with a testcase.

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