On Fri, Dec 02, 2016 at 07:46:38AM -0200, Marcelo Ricardo Leitner wrote:
> Andrey Konovalov reported that this vmalloc call is based on an
> userspace request and that it's spewing traces, which may flood the logs
> and cause DoS if abused.
>
> Florian Westphal also mentioned that this call should not trigger OOM
> killer.
>
> This patch brings the vmalloc call in sync to kmalloc and disables the
> warn trace on allocation failure and also disable OOM killer invocation.
>
> Note, however, that under such stress situation, other places may
> trigger OOM killer invocation.
Unless anyone has an objection, I'm going to place this in nf-next.
Thanks.
> Reported-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> Cc: Florian Westphal <fw@xxxxxxxxx>
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
> ---
> net/netfilter/x_tables.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
> index fc4977456c30e098197b4f987b758072c9cf60d9..dece525bf83a0098dad607fce665cd0bde228362 100644
> --- a/net/netfilter/x_tables.c
> +++ b/net/netfilter/x_tables.c
> @@ -958,7 +958,9 @@ struct xt_table_info *xt_alloc_table_info(unsigned int size)
> if (sz <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER))
> info = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
> if (!info) {
> - info = vmalloc(sz);
> + info = __vmalloc(sz, GFP_KERNEL | __GFP_NOWARN |
> + __GFP_NORETRY | __GFP_HIGHMEM,
> + PAGE_KERNEL);
> if (!info)
> return NULL;
> }
> --
> 2.9.3
>
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