diff mbox series

[bpf-next,v3,1/5] bpf: Limit the number of uprobes when attaching program to multiple uprobes

Message ID 20231215100708.2265609-2-houtao@huaweicloud.com (mailing list archive)
State Accepted
Commit 8b2efe51ba85ca83460941672afac6fca4199df6
Delegated to: BPF
Headers show
Series bpf: Fix warnings in kvmalloc_node() | expand

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Commit Message

Hou Tao Dec. 15, 2023, 10:07 a.m. UTC 
From: Hou Tao <houtao1@huawei.com>

An abnormally big cnt may be passed to link_create.uprobe_multi.cnt,
and it will trigger the following warning in kvmalloc_node():

	if (unlikely(size > INT_MAX)) {
		WARN_ON_ONCE(!(flags & __GFP_NOWARN));
		return NULL;
	}

Fix the warning by limiting the maximal number of uprobes in
bpf_uprobe_multi_link_attach(). If the number of uprobes is greater than
MAX_UPROBE_MULTI_CNT, the attachment will return -E2BIG.

Acked-by: Jiri Olsa <jolsa@kernel.org>
Fixes: 89ae89f53d20 ("bpf: Add multi uprobe link")
Reported-by: xingwei lee <xrivendell7@gmail.com>
Closes: https://lore.kernel.org/bpf/CABOYnLwwJY=yFAGie59LFsUsBAgHfroVqbzZ5edAXbFE3YiNVA@mail.gmail.com
Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 kernel/trace/bpf_trace.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 774cf476a892..75c05aea9fd9 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -42,6 +42,8 @@ 
 #define bpf_event_rcu_dereference(p)					\
 	rcu_dereference_protected(p, lockdep_is_held(&bpf_event_mutex))
 
+#define MAX_UPROBE_MULTI_CNT (1U << 20)
+
 #ifdef CONFIG_MODULES
 struct bpf_trace_module {
 	struct module *module;
@@ -3344,6 +3346,8 @@  int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
 
 	if (!upath || !uoffsets || !cnt)
 		return -EINVAL;
+	if (cnt > MAX_UPROBE_MULTI_CNT)
+		return -E2BIG;
 
 	uref_ctr_offsets = u64_to_user_ptr(attr->link_create.uprobe_multi.ref_ctr_offsets);
 	ucookies = u64_to_user_ptr(attr->link_create.uprobe_multi.cookies);