devfs_make_node()
devfs_make_node()
- Subject: devfs_make_node()
- From: Nick Blievers <email@hidden>
- Date: Fri, 09 Nov 2007 10:47:16 +0800
Hi,
This is really an FYI more than anything. There is a bug in
dev_finddir() that affects devfs_make_node() such that if you pass it a
path that contains a directory, the directory will be created but the
name will be truncated. This stems from a simple off by one error in
dev_finddir().
Although I have raised a bug about this, I have been told that I
shouldn't be trying to create directories as part of a device name. This
problem was introduced in leopard with the shift away from unsafe string
functions. So rather than strncpy(), strlcpy() has been used, without
the appropriate length change.
I am curious what the reasons are that make it considered unsafe to
create a subdirectory under /dev -- but mainly this email is to make
people aware of a regression which exists in leopard that apparently
will not get fixed.
Hope this helps someone,
Nick
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