Giacomo Catenazzi <[email protected]> writes:
> Andrew Morton wrote:
>> On Mon, 3 Dec 2007 19:00:25 GMT Linux Kernel Mailing List
> <[email protected]> wrote:
>>
>>> Gitweb:
> http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2b1e300a9dfc3196ccddf6f1d74b91b7af55e416
>>> Commit: 2b1e300a9dfc3196ccddf6f1d74b91b7af55e416
>>> Parent: e03ba84adb62fbc6049325a5bc00ef6932fa5e39
>>> Author: Eric W. Biederman <[email protected]>
>>> AuthorDate: Sun Dec 2 00:33:17 2007 +1100
>>> Committer: Herbert Xu <[email protected]>
>>> CommitDate: Sun Dec 2 00:33:17 2007 +1100
>>>
>>> [NETNS]: Fix /proc/net breakage
>>>
>>> Well I clearly goofed when I added the initial network namespace support
>>> for /proc/net. Currently things work but there are odd details visible to
>>> user space, even when we have a single network namespace.
>>>
>>> Since we do not cache proc_dir_entry dentries at the moment we can just
>>> modify ->lookup to return a different directory inode depending on the
>>> network namespace of the process looking at /proc/net, replacing the
>>> current technique of using a magic and fragile follow_link method.
>>>
>>> To accomplish that this patch:
>>> - introduces a shadow_proc method to allow different dentries to
>>> be returned from proc_lookup.
>>> - Removes the old /proc/net follow_link magic
>>> - Fixes a weakness in our not caching of proc generic dentries.
>>>
>>> As shadow_proc uses a task struct to decided which dentry to return we can
>>> go back later and fix the proc generic caching without modifying any code
>>> that uses the shadow_proc method.
>>
>> This patch caused the binfmt_misc regression reported in
>> http://bugzilla.kernel.org/show_bug.cgi?id=9504
>
> This patch also doesn't allow to mount /proc/bus/usb
Agreed.
Strictly speaking the mounts work but we just can't find them.
It is equally bad either way.
Eric
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