On Mon, Nov 20, 2017 at 01:54:18PM +0100, Phil Sutter wrote: > On Mon, Nov 20, 2017 at 01:37:26PM +0100, Pablo Neira Ayuso wrote: > > On Thu, Nov 16, 2017 at 08:10:24PM +0100, Phil Sutter wrote: > > > If a second context is created, the second call to nft_ctx_free() leads > > > to freeing invalid pointers in nft_exit(). Fix this by introducing a > > > reference counter so that neither nft_init() nor nft_exit() run more > > > than once in a row. > > > > > > This reference counter has to be protected from parallel access. Do this > > > using a mutex in a way that once nft_init() returns, the first call to > > > that function running in parallel is guaranteed to be finished - > > > otherwise it could happen that things being initialized in one thread > > > are already accessed in another one. > > > > I would prefer this table is placed into the context object, so they > > are not global anymore. So I would prefer we fix this the right way(tm). > > > > Let me know your thoughts, thanks! > > I don't think that's feasible: Looking at 'mark_tbl' for instance, this is > accessed from callbacks in 'mark_type', so we would have to make nft_ctx > accessible by all functions dealing with datatypes. Probably some specific new context object that wrap access to these tables, not necessarily nft_ctx. It's just more code, it will not be a small patch, but I don't see any reason this can't be done. -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
