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Commit 19926968 authored by Florian Westphal's avatar Florian Westphal Committed by Pablo Neira Ayuso
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netfilter: x_tables: cap allocations at 512 mbyte



Arbitrary limit, however, this still allows huge rulesets
(> 1 million rules).  This helps with automated fuzzer as it prevents
oom-killer invocation.

Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent e816a2ce
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+2 −1
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("{ip,ip6,arp,eb}_tables backend module");

#define XT_PCPU_BLOCK_SIZE 4096
#define XT_MAX_TABLE_SIZE	(512 * 1024 * 1024)

struct compat_delta {
	unsigned int offset; /* offset in kernel */
@@ -1117,7 +1118,7 @@ struct xt_table_info *xt_alloc_table_info(unsigned int size)
	struct xt_table_info *info = NULL;
	size_t sz = sizeof(*info) + size;

	if (sz < sizeof(*info))
	if (sz < sizeof(*info) || sz >= XT_MAX_TABLE_SIZE)
		return NULL;

	/* __GFP_NORETRY is not fully supported by kvmalloc but it should