Messages in this thread |  | | Date | Thu, 7 Nov 1996 13:29:33 +0100 | From | (Zoltan Hidvegi) | Subject | NFS client permission bug |
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[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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