5.3 -> 5 : sshd multiple log entries & login_getclass: unknown
andrei at kableu.com
Sat Feb 5 22:52:27 PST 2005
On Sat, Feb 05, 2005 at 10:12:45PM -0800, Andrew Konstantinov wrote:
> On Thu, Feb 03, 2005 at 09:11:07PM -0800, Doug White wrote:
> > On Tue, 1 Feb 2005, Andrew Konstantinov wrote:
> > > > > I can't reproduce this on my systems, many of which started at 5.3 and now
> > > > > build 5-stable. Are you using the system ssh or one you built from ports?
> > > > >
> > > > > What is the output of 'ls -l /etc/login.conf*'?
> > >
> > > I knew I wasn't hallucinating. When I rebuild and reinstall src/lib/libc
> > > from RELENG_5_3 sources on RELENG_5 system, all of the above problems
> > > disappear altogether. The bugs are in the dynamically linked library
> > > that sshd relies on. Once the new library is in place and
> > > "/etc/rc.d/sshd restart" is performed, the bugs disappear. I don't have
> > > time to dig into that right now, but I'll be back with patches.
> > The simple fact stands that noone else can reproduce this, which leads me
> > to believe you took a non-standard approach to upgrading, and therefore
> > are getting what you asked for. :-)
> > If you can provide exact reproduction steps, starting from bare metal,
> > I'll follow them.
> The other important thing that I've noticed is that when I set
> UsePrivilegeSeparation in sshd_config to "no", all those bugs disappear.
Also, when I traced sshd in debug mode using gdb, I've found that
/usr/src/lib/libc/gen/getcap.c lines 246 - 274 work properly and return the
valid "root" entry from the login database and that code is enclosed in the
else statement that is a part of "if (fd >= 0)" construction. So, I apparently,
something gets to getent around cgetent with already existing file
descriptor which causes a different portion of code to be executed
(instead of 246 - 274) which in its turn causes a problem. Perhaps the
descriptor is poing to a wrong file?
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