rmdir(2) behavior to prevent pax(1) from working
dillon at apollo.backplane.com
Mon Dec 27 12:03:09 PST 2004
: I notice that the current rmdir(2) implementation allows
: rmdir(2) to remove a directory path whose final component is
: either "." or ".." (such as /tmp/foo/bar/.).
: This sounds no problem, but the pax(1) utility depends on this
: behavior at least. Try the following commands:
: % cd /tmp
: % mkdir a b
: % touch a/foo
: % cd a
: % pax -r -w . ../b
: In this case pax(1) should go into a infinite loop.
: The SUSv3 also says "If the path argument refers to a path
: whose final component is either dot or dot-dot, rmdir() shall fail."
: so I think it is better to be fixed.
: Probably kern_rmdir() @ sys/kern/vfs_syscalls.c needs
: some sort of sanity check for the trailing "." and "..",
: but unfortunately I have no idea about a concrete solution because
: I am not familiar with the new VFS/namecache API...
: Could anyone investigate this problem?
:| Hiroki SATO
Hmm. I think this was an artifact introduced by the new VFS code. It
should be easy to fix. I'll have a go at it today.
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