[Bug nscd/29992] New: nscd repeatably crashes calling __strlen_avx2 when using nss-hostname

[Bug nscd/29992] New: nscd repeatably crashes calling __strlen_avx2 when using nss-hostname

[Diego.SantaCruz at spinetix dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29992

            Bug ID: 29992
           Summary: nscd repeatably crashes calling __strlen_avx2 when
                    using nss-hostname
           Product: glibc
           Version: 2.31
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: nscd
          Assignee: unassigned at sourceware dot org
          Reporter: Diego.SantaCruz at spinetix dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

We have a setup where the hosts entry of nss is configured as follows and nscd
is enabled.

hosts:          files myhostname  dns mdns

The myhostname provider is nss-hostname 0.3
(https://0pointer.de/lennart/projects/nss-myhostname/)

When doing "getent ahosts `hostname`" nscd crashes immediately.

We use glibc 2.31 (from Yocto dunfell).

We have tracked this crash to a NULL pointer dereference in aicache.c:174
(function addhstaiX), in the following lines.

          canon = at->name;
          canonlen = strlen (canon) + 1;

We tracked this to bug 29607 which has already been fixed in master and
backported all the way down to 2.34

But 2.31 is also affected by the exact same issue, I backported the fix [1] to
2.31 with a simple git cherry pick and it does indeed solve the problem.

Could this be backported to the 2.31 branch?

[1]
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6e33e5c4b73cea7b8aa3de0947123db16200fb65

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