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netfilter: nftables: disallow updates on table ownership

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Disallow updating the ownership bit on an existing table: Do not allow
to grab ownership on an existing table. Do not allow to drop ownership
on an existing table.

Fixes: 6001a930ce ("netfilter: nftables: introduce table ownership")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso
2021-02-27 22:31:27 +01:00
parent 8e24edddad
commit 9cc0001a18
1 changed files with 6 additions and 0 deletions
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6
net/netfilter/nf_tables_api.c
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@@ -916,6 +916,12 @@ static int nf_tables_updtable(struct nft_ctx *ctx)
if (flags == ctx->table->flags) if (flags == ctx->table->flags)
return 0; return 0;
if ((nft_table_has_owner(ctx->table) &&
!(flags & NFT_TABLE_F_OWNER)) ||
(!nft_table_has_owner(ctx->table) &&
flags & NFT_TABLE_F_OWNER))
return -EOPNOTSUPP;
trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
sizeof(struct nft_trans_table)); sizeof(struct nft_trans_table));
if (trans == NULL) if (trans == NULL)