| Message ID | 20210506125350.3887306-1-eric.dumazet@gmail.com (mailing list archive) |
|---|---|
| State | Awaiting Upstream |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [net,1/2] netfilter: nf_tables: avoid overflows in nft_hash_buckets() | expand |
| Context | Check | Description |
|---|---|---|
| netdev/cover_letter | success | Link |
| netdev/fixes_present | success | Link |
| netdev/patch_count | success | Link |
| netdev/tree_selection | success | Clearly marked for net |
| netdev/subject_prefix | success | Link |
| netdev/cc_maintainers | warning | 4 maintainers not CCed: davem@davemloft.net kadlec@netfilter.org coreteam@netfilter.org kuba@kernel.org |
| netdev/source_inline | success | Was 0 now: 0 |
| netdev/verify_signedoff | success | Link |
| netdev/module_param | success | Was 0 now: 0 |
| netdev/build_32bit | success | Errors and warnings before: 16 this patch: 16 |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/verify_fixes | success | Link |
| netdev/checkpatch | warning | WARNING: Duplicate signature WARNING: line length of 85 exceeds 80 columns |
| netdev/build_allmodconfig_warn | success | Errors and warnings before: 16 this patch: 16 |
| netdev/header_inline | success | Link |
On Thu, May 06, 2021 at 05:53:50AM -0700, Eric Dumazet wrote: > From: Eric Dumazet <edumazet@google.com> > > User space could ask for very large hash tables, we need to make sure > our size computations wont overflow. > > nf_tables_newset() needs to double check the u64 size > will fit into size_t field. Also applied, thannks.
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 0b7fe0a902ff56c162741e6715ad62d928381ea7..c14213bc714b1a54a4287ae898d3a096b21e00ac 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -4184,6 +4184,7 @@ static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info, unsigned char *udata; struct nft_set *set; struct nft_ctx ctx; + size_t alloc_size; u64 timeout; char *name; int err, i; @@ -4329,8 +4330,10 @@ static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info, size = 0; if (ops->privsize != NULL) size = ops->privsize(nla, &desc); - - set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); + alloc_size = sizeof(*set) + size + udlen; + if (alloc_size < size) + return -ENOMEM; + set = kvzalloc(alloc_size, GFP_KERNEL); if (!set) return -ENOMEM; diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c index 328f2ce32e4cbd772afe03a10f6d13a7ed6b93d5..7b3d0a78c5696747a2e71b1a58303fa141de6c2b 100644 --- a/net/netfilter/nft_set_hash.c +++ b/net/netfilter/nft_set_hash.c @@ -623,7 +623,7 @@ static u64 nft_hash_privsize(const struct nlattr * const nla[], const struct nft_set_desc *desc) { return sizeof(struct nft_hash) + - nft_hash_buckets(desc->size) * sizeof(struct hlist_head); + (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head); } static int nft_hash_init(const struct nft_set *set, @@ -663,8 +663,8 @@ static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features, return false; est->size = sizeof(struct nft_hash) + - nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + - desc->size * sizeof(struct nft_hash_elem); + (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + + (u64)desc->size * sizeof(struct nft_hash_elem); est->lookup = NFT_SET_CLASS_O_1; est->space = NFT_SET_CLASS_O_N; @@ -681,8 +681,8 @@ static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features return false; est->size = sizeof(struct nft_hash) + - nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + - desc->size * sizeof(struct nft_hash_elem); + (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + + (u64)desc->size * sizeof(struct nft_hash_elem); est->lookup = NFT_SET_CLASS_O_1; est->space = NFT_SET_CLASS_O_N;