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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-02-27 22:31:27 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-03-02 16:37:22 +0100 |
| commit | 9cc0001a18b4e5f46ec481201c88ae16f0a69bb0 (patch) | |
| tree | eed207ebcc8cd4f942869d48a0f2f947f89243e2 /net | |
| parent | netfilter: x_tables: gpf inside xt_find_revision() (diff) | |
| download | linux-9cc0001a18b4e5f46ec481201c88ae16f0a69bb0.tar.xz linux-9cc0001a18b4e5f46ec481201c88ae16f0a69bb0.zip | |
netfilter: nftables: disallow updates on table ownership
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: 6001a930ce03 ("netfilter: nftables: introduce table ownership")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nf_tables_api.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index c1eb5cdb3033..b07703e19108 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -916,6 +916,12 @@ static int nf_tables_updtable(struct nft_ctx *ctx) if (flags == ctx->table->flags) 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, sizeof(struct nft_trans_table)); if (trans == NULL) |