Date: Mon, 21 Apr 2003 16:09:12 -0500 From: "Jacques A. Vidrine" <nectar@FreeBSD.org> To: "Robin P. Blanchard" <Robin.Blanchard@gactr.uga.edu> Cc: current@freebsd.org Subject: Re: Latest world NIS woes Message-ID: <20030421210912.GA89777@madman.celabo.org> In-Reply-To: <20030418164437.GD45899@madman.celabo.org> References: <EE3D3FBAFFCAED448C21C398FDAD91AC0107F7@EBE1.gc.nat> <20030418163352.GC45899@madman.celabo.org> <20030418164437.GD45899@madman.celabo.org>
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On Fri, Apr 18, 2003 at 11:44:37AM -0500, Jacques A. Vidrine wrote:
> On Fri, Apr 18, 2003 at 11:33:52AM -0500, Jacques A. Vidrine wrote:
> > One would suspect. Is the YP server a FreeBSD box? I guess not,
> > since your crypt'd password seems to be included in the standard map?
>
> I built a map with the password included, same results:
>
> # ypcat passwd
> ypuser1:*:9001:9001:YP User 1:/nonexistent:/sbin/nologin
> ypuser2:*:9002:9002:YP User 2:/nonexistent:/sbin/nologin
> robin:wasCryptdPass:20292:30028::/home/robin:/bin/bash
> # id -u robin
> 20292
> # id -g robin
> 30028
> # id robin
> uid=20292(robin) gid=30028(NSS) groups=30028(NSS)
>
> (I grabbed the `NSS' group line from the ktrace output. I also
> saw that you had no nsswitch.conf, so I configured likewise to test.)
>
> > Possibly I have a bug in passwd.adjunct map handling -- I haven't been
> > able to test that.
>
> > I'll grab your ktrace, and also peek to see what I might have done
> > wrong with passwd.adjunct.
>
> Well, I can see from your ktrace that passwd.adjunct is not involved.
>
> I've not been able to reproduce the problem here. Can you send me a
> backtrace?
For those that were following this thread, this is what I found:
I could not reproduce Robin's issue, despite using the same data for
the entries he was interested in. So he let me jump on his machine to
look closer. I found something very odd:
Breakpoint 3, wrap_getpwnam_r (key={name = 0x28135d00 "", uid = 672357632}, pwd=0x28135d00, buffer=0x28135d00 "", bufsize=672357632, res=0x28135d00)
at /usr/src/lib/libc/gen/getpwent.c:398
398 return (getpwnam_r(key.name, pwd, buffer, bufsize, res));
(gdb) bt
#0 wrap_getpwnam_r (key={name = 0x28135d00 "", uid = 672357632}, pwd=0x28135d00, buffer=0x28135d00 "", bufsize=672357632, res=0x28135d00)
at /usr/src/lib/libc/gen/getpwent.c:398
#1 0x280c912b in getpw (fn=0x280c91a0 <wrap_getpwnam_r>, key={name = 0xbfbffc71 "robin", uid = 3217030257}) at /usr/src/lib/libc/gen/getpwent.c:377
#2 0x280c92a9 in getpwnam (name=0x28135d00 "") at /usr/src/lib/libc/gen/getpwent.c:424
#3 0x08049164 in who (u=0x281307bc "øF\f") at /usr/src/usr.bin/id/id.c:331
#4 0x08048b96 in main (argc=1, argv=0x281307bc) at /usr/src/usr.bin/id/id.c:135
#5 0x080488f5 in _start (ap=0xbfbffc50 "/usr/obj.g/usr/src/usr.bin/id/id") at /usr/src/lib/csu/i386-elf/crt1.c:104
(gdb) frame 1
#1 0x280c912b in getpw (fn=0x280c91a0 <wrap_getpwnam_r>, key={name = 0xbfbffc71 "robin", uid = 3217030257}) at /usr/src/lib/libc/gen/getpwent.c:377
377 rv = fn(key, &pwd, pwd_storage, pwd_storage_size, &res);
(gdb) frame 0
#0 wrap_getpwnam_r (key={name = 0x28135d00 "", uid = 672357632}, pwd=0x28135d00, buffer=0x28135d00 "", bufsize=672357632, res=0x28135d00)
at /usr/src/lib/libc/gen/getpwent.c:398
398 return (getpwnam_r(key.name, pwd, buffer, bufsize, res));
(gdb) print &key
Address requested for identifier "key" which is in register $eax
(gdb) print &pwd
Address requested for identifier "pwd" which is in register $eax
(gdb)
It is as if the generated code had a register aliasing problem. I
noticed that he was building with CPUTYPE=i686, and I asked him to
retry with NO_CPUTYPE_FLAGS. The problem went away.
Nonetheless, I cannot reproduce the issue here, even with
CPUTYPE=i686.
Any GCC gurus have comments? For some reason I want to suspect issues
with passing a `union' as an argument. I'm going to have Robin try a
version that does not do that (it was only being used for type safety)
and see if we get similar results.
Cheers,
--
Jacques A. Vidrine <nectar@celabo.org> http://www.celabo.org/
NTT/Verio SME . FreeBSD UNIX . Heimdal Kerberos
jvidrine@verio.net . nectar@FreeBSD.org . nectar@kth.se
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