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SubjectNFS client permission bug
[I posted this to a local news server but I'm not sure that it is correctly
configured to relay messages to vger so I post it again directly to vger.
Sorry if you receive this message twice.]

If I open a file for writing on an NFS filesystem as root, then change the
userid writes to the file will fail. The NFS filesystem is exported with
full root privileges enabled. This happens with Ultrix Solaris and Lniux
servers so it is an NFS client code probelm. E.g.

neumann /ubackup # ls -l test
ls: test: No such file or directory
neumann /ubackup # su hzoli -c 'echo bad' > test
zsh: write error: permission denied
neumann /ubackup # ls -l test
-rw-r--r-- 1 root root 0 Nov 6 18:52 test
neumann /ubackup #
There is no permission problems on normal filesystems. Ultrix and Solaris
2.5 does not have this problem.

But this behaviour is not consistent. I am in a directory owned by user
hzoli userid 798. In zsh assigning EUID calls seteuid():

neumann /ubackup # ls -l test
ls: test: No such file or directory
neumann ~ # (EUID=798 ; echo good ; EUID=1 ; echo bad) > test
zsh: write error: permission denied
zsh: write error: permission denied
neumann ~ # ls -l test
-rw-r--r-- 1 root root 0 Nov 6 19:04 test
neumann ~ # rm test ; (EUID=798 ; touch test)
neumann ~ # ls -l test
-rw-r--r-- 1 hzoli root 0 Nov 6 19:04 test
neumann ~ # (EUID=798 ; echo good ; EUID=1 ; echo bad) > test
neumann ~ # ls -l test
-rw-r--r-- 1 hzoli root 9 Nov 6 19:04 test
neumann ~ # (echo good ; EUID=1 ; echo bad) > test
zsh: write error: permission denied
neumann ~ # ls -l test
-rw-r--r-- 1 hzoli root 5 Nov 6 19:04 test
Zoltan

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