diff options
| author | Florian Westphal <fw@strlen.de> | 2026-03-17 12:23:08 +0100 |
|---|---|---|
| committer | Florian Westphal <fw@strlen.de> | 2026-03-19 10:26:31 +0100 |
| commit | 24f90fa3994b992d1a09003a3db2599330a5232a (patch) | |
| tree | e5e94aa247da295d063a5618aaa33cd945a7d5d3 /net | |
| parent | 7c46bd845d89ad4772573cfe0f2a56b93db75cc7 (diff) | |
netfilter: bpf: defer hook memory release until rcu readers are done
Yiming Qian reports UaF when concurrent process is dumping hooks via
nfnetlink_hooks:
BUG: KASAN: slab-use-after-free in nfnl_hook_dump_one.isra.0+0xe71/0x10f0
Read of size 8 at addr ffff888003edbf88 by task poc/79
Call Trace:
<TASK>
nfnl_hook_dump_one.isra.0+0xe71/0x10f0
netlink_dump+0x554/0x12b0
nfnl_hook_get+0x176/0x230
[..]
Defer release until after concurrent readers have completed.
Reported-by: Yiming Qian <yimingqian591@gmail.com>
Fixes: 84601d6ee68a ("bpf: add bpf_link support for BPF_NETFILTER programs")
Signed-off-by: Florian Westphal <fw@strlen.de>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nf_bpf_link.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/netfilter/nf_bpf_link.c b/net/netfilter/nf_bpf_link.c index 6f3a6411f4af..c20031891b86 100644 --- a/net/netfilter/nf_bpf_link.c +++ b/net/netfilter/nf_bpf_link.c @@ -170,7 +170,7 @@ static int bpf_nf_link_update(struct bpf_link *link, struct bpf_prog *new_prog, static const struct bpf_link_ops bpf_nf_link_lops = { .release = bpf_nf_link_release, - .dealloc = bpf_nf_link_dealloc, + .dealloc_deferred = bpf_nf_link_dealloc, .detach = bpf_nf_link_detach, .show_fdinfo = bpf_nf_link_show_info, .fill_link_info = bpf_nf_link_fill_link_info, |