CLANG 3.2 breaks security/pam_ssh_agent_auth on stable/9

[Kimmo Paasiala]

Hello list.

I just updated my stable/9 system after clang3.2 was added. My system
is amd64, both world and kernel are compiled with clang3.2 and the
default compiler is clang. I'm tracking the sources with GIT and the
version I have corresponds to SVN revision r245451.

Everything else seems to work but the pam authentication module
security/pam_ssh_agent_auth segfaults immediately.

The version I had was compiled in a releng/9.1 jail using poudriere
with clang as the default compiler. I recompiled the port with the new
clang3.2 compiler but no difference.

Here is the backtrace from gdb when I run su(1) as root with the
suitable settings to force the use of the plugin:

(gdb) run
Starting program: /usr/bin/su
(no debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...
Program received signal SIGSEGV, Segmentation fault.
0x0000000800ef2070 in strsvis () from /lib/libc.so.7
(gdb) bt
#0  0x0000000800ef2070 in strsvis () from /lib/libc.so.7
#1  0x0000000800ef2584 in strvis () from /lib/libc.so.7
#2  0x0000000800ef25e5 in strnvis () from /lib/libc.so.7
#3  0x0000000801c0e2e7 in do_log () from /usr/local/lib/pam_ssh_agent_auth.so
#4  0x0000000801c0e4ff in logit () from /usr/local/lib/pam_ssh_agent_auth.so
#5  0x0000000801c116f4 in pam_user_key_allowed2 () from
/usr/local/lib/pam_ssh_agent_auth.so
#6  0x0000000801c11f1e in pam_user_key_allowed () from
/usr/local/lib/pam_ssh_agent_auth.so
#7  0x0000000801c11a18 in userauth_pubkey_from_id () from
/usr/local/lib/pam_ssh_agent_auth.so
#8  0x0000000801c118fa in find_authorized_keys () from
/usr/local/lib/pam_ssh_agent_auth.so
#9  0x0000000801c122e5 in pam_sm_authenticate () from
/usr/local/lib/pam_ssh_agent_auth.so
#10 0x0000000800a343e0 in openpam_dispatch () from /usr/lib/libpam.so.5
#11 0x0000000800a33946 in pam_authenticate () from /usr/lib/libpam.so.5
#12 0x00000000004020b8 in ?? ()
#13 0x0000000000401c61 in ?? ()
#14 0x000000080061f000 in ?? ()
#15 0x0000000000000000 in ?? ()

The str*vis() calls suggest that it's something in the libc maybe?


Regards,

Kimmo Paasiala