Hi, I just noticed many many sshd segfaults listed in /var/log/kern.log. There are two versions. They look like this:
sshd[1086]: segfault at 7fff615eaec8 ip 00007ff2a586f42f sp 00007fff615eaed0 error 6 in libwrap.so.0.7.6[7ff2a586e000+5000] sshd[1094]: segfault at 7ffcd3ff6f08 ip 00007f18d4f5dac7 sp 00007ffcd3ff6ed0 error 6 in libc-2.31.so[7f18d4f2a000+14b000] The hex addresses are different each time, but the rest is the same. It happens every time there's an incoming ssh connection attempt via IPv6 when the IPv6 address isn't listed in /ertc/hosts.allow. There are many because it's a cronned backup. I am using /etc/hosts.allow for sshd and have a mixture of IPv4 and IPv6 addresses in it. When I added the IPv6 address in question to /etc/hosts.allow, the segfaults stopped and the connections worked. This started 2 days before I upgraded to debian11 and there was a different version number for libc (so it's not new), but it's still happening with debian11. It might be a bug in libwrap0 (whose version number didn't change much), or in how openssh-server is using it. cheers, raf
