On Wed, Jan 31, 2007 at 11:54:35AM +0100, Duncan Sands wrote:
> Can read_proc still be executing when remove_proc_entry returns?
>
> In my driver [*] I allocate some data and create a proc entry using
> create_proc_entry. My read method reads from my allocated data. When
> shutting down, I call remove_proc_entry and immediately free the data.
> If some call to read_proc is still executing at this point then it will
> be accessing freed memory. Can this happen? I've been rummaging around
> in fs/proc to see what prevents it, but didn't find anything yet.
This should be fixed by the following patch (in -mm currently):
http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20-rc6/2.6.20-rc6-mm3/broken-out/fix-rmmod-read-write-races-in-proc-entries.patch
Tell me if you're unsure it will.
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