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netfilter: nf_tables: store transaction list locally while requesting module

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This patch fixes a WARN_ON in nft_set_destroy() due to missing
set reference count drop from the preparation phase. This is triggered
by the module autoload path. Do not exercise the abort path from
nft_request_module() while preparation phase cleaning up is still
pending.

 WARNING: CPU: 3 PID: 3456 at net/netfilter/nf_tables_api.c:3740 nft_set_destroy+0x45/0x50 [nf_tables]
 [...]
 CPU: 3 PID: 3456 Comm: nft Not tainted 5.4.6-arch3-1 #1
 RIP: 0010:nft_set_destroy+0x45/0x50 [nf_tables]
 Code: e8 30 eb 83 c6 48 8b 85 80 00 00 00 48 8b b8 90 00 00 00 e8 dd 6b d7 c5 48 8b 7d 30 e8 24 dd eb c5 48 89 ef 5d e9 6b c6 e5 c5 <0f> 0b c3 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 7f 10 e9 52
 RSP: 0018:ffffac4f43e53700 EFLAGS: 00010202
 RAX: 0000000000000001 RBX: ffff99d63a154d80 RCX: 0000000001f88e03
 RDX: 0000000001f88c03 RSI: ffff99d6560ef0c0 RDI: ffff99d63a101200
 RBP: ffff99d617721de0 R08: 0000000000000000 R09: 0000000000000318
 R10: 00000000f0000000 R11: 0000000000000001 R12: ffffffff880fabf0
 R13: dead000000000122 R14: dead000000000100 R15: ffff99d63a154d80
 FS:  00007ff3dbd5b740(0000) GS:ffff99d6560c0000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00001cb5de6a9000 CR3: 000000016eb6a004 CR4: 00000000001606e0
 Call Trace:
  __nf_tables_abort+0x3e3/0x6d0 [nf_tables]
  nft_request_module+0x6f/0x110 [nf_tables]
  nft_expr_type_request_module+0x28/0x50 [nf_tables]
  nf_tables_expr_parse+0x198/0x1f0 [nf_tables]
  nft_expr_init+0x3b/0xf0 [nf_tables]
  nft_dynset_init+0x1e2/0x410 [nf_tables]
  nf_tables_newrule+0x30a/0x930 [nf_tables]
  nfnetlink_rcv_batch+0x2a0/0x640 [nfnetlink]
  nfnetlink_rcv+0x125/0x171 [nfnetlink]
  netlink_unicast+0x179/0x210
  netlink_sendmsg+0x208/0x3d0
  sock_sendmsg+0x5e/0x60
  ____sys_sendmsg+0x21b/0x290

Update comment on the code to describe the new behaviour.

Reported-by: Marco Oliverio <marco.oliverio@tanaza.com>
Fixes: 452238e8d5 ("netfilter: nf_tables: add and use helper for module autoload")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-01-13 18:09:58 +01:00
parent 212e7f5660
commit ec7470b834
1 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
net/netfilter/nf_tables_api.c
View File

@ -564,23 +564,21 @@ __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
}
/*
* Loading a module requires dropping mutex that guards the
* transaction.
* We first need to abort any pending transactions as once
* mutex is unlocked a different client could start a new
* transaction. It must not see any 'future generation'
* changes * as these changes will never happen.
* Loading a module requires dropping mutex that guards the transaction.
* A different client might race to start a new transaction meanwhile. Zap the
* list of pending transaction and then restore it once the mutex is grabbed
* again. Users of this function return EAGAIN which implicitly triggers the
* transaction abort path to clean up the list of pending transactions.
*/
#ifdef CONFIG_MODULES
static int __nf_tables_abort(struct net *net);
static void nft_request_module(struct net *net, const char *fmt, ...)
{
char module_name[MODULE_NAME_LEN];
LIST_HEAD(commit_list);
va_list args;
int ret;
__nf_tables_abort(net);
list_splice_init(&net->nft.commit_list, &commit_list);
va_start(args, fmt);
ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
@ -591,6 +589,9 @@ static void nft_request_module(struct net *net, const char *fmt, ...)
mutex_unlock(&net->nft.commit_mutex);
request_module("%s", module_name);
mutex_lock(&net->nft.commit_mutex);
WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
list_splice(&commit_list, &net->nft.commit_list);
}
#endif