Messages in this thread | | | Subject | Re: DoS with POSIX file locks? | From | Miklos Szeredi <> | Date | Mon, 20 Mar 2006 14:24:11 +0100 |
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> > > Right. Um. I took it out back in March 2003 after enough people > > > convinced me it wasn't worth trying to account for all the memory > > > processes use, and the userbeans project would take care of it anyway. > > > Haha. > > > > > > It's hard to fix the accounting. You have to deal with one thread > > > allocating the lock, and then a different thread freeing it. We never > > > actually accounted for posix locks (which are the ones we really needed > > > to!) and on occasion had current->locks go negative, with all kinds of > > > associated badness. > > > > Things look fairly straightforward if the accounting is done in > > files_struct instead of task_struct. > > that's the wrong place; you can send fd's over unix sockets to other > processes....
POSIX locks have no association with fd's. Only the inode and the "owner" is relevant, where owner is derived from the files_struct pointer for local locks.
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