4.18-stable review patch. If anyone has any objections, please let me know.
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From: Michal Hocko mhocko@suse.com
[ Upstream commit a148ce15375fc664ad64762c751c0c2aecb2cafe ]
eacd86ca3b03 ("net/netfilter/x_tables.c: use kvmalloc() in xt_alloc_table_info()") has unintentionally fortified xt_alloc_table_info allocation when __GFP_RETRY has been dropped from the vmalloc fallback. Later on there was a syzbot report that this can lead to OOM killer invocations when tables are too large and 0537250fdc6c ("netfilter: x_tables: make allocation less aggressive") has been merged to restore the original behavior. Georgi Nikolov however noticed that he is not able to install his iptables anymore so this can be seen as a regression.
The primary argument for 0537250fdc6c was that this allocation path shouldn't really trigger the OOM killer and kill innocent tasks. On the other hand the interface requires root and as such should allow what the admin asks for. Root inside a namespaces makes this more complicated because those might be not trusted in general. If they are not then such namespaces should be restricted anyway. Therefore drop the __GFP_NORETRY and replace it by __GFP_ACCOUNT to enfore memcg constrains on it.
Fixes: 0537250fdc6c ("netfilter: x_tables: make allocation less aggressive") Reported-by: Georgi Nikolov gnikolov@icdsoft.com Suggested-by: Vlastimil Babka vbabka@suse.cz Acked-by: Florian Westphal fw@strlen.de Signed-off-by: Michal Hocko mhocko@suse.com Acked-by: Vlastimil Babka vbabka@suse.cz Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/netfilter/x_tables.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-)
--- a/net/netfilter/x_tables.c +++ b/net/netfilter/x_tables.c @@ -1178,12 +1178,7 @@ struct xt_table_info *xt_alloc_table_inf if (sz < sizeof(*info) || sz >= XT_MAX_TABLE_SIZE) return NULL;
- /* __GFP_NORETRY is not fully supported by kvmalloc but it should - * work reasonably well if sz is too large and bail out rather - * than shoot all processes down before realizing there is nothing - * more to reclaim. - */ - info = kvmalloc(sz, GFP_KERNEL | __GFP_NORETRY); + info = kvmalloc(sz, GFP_KERNEL_ACCOUNT); if (!info) return NULL;