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bpf: Limit the number of kprobes when attaching program to multiple kprobes
[ Upstream commitd6d1e6c17c
] An abnormally big cnt may also be assigned to kprobe_multi.cnt when attaching multiple kprobes. 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 kprobes in bpf_kprobe_multi_link_attach(). If the number of kprobes is greater than MAX_KPROBE_MULTI_CNT, the attachment will fail and return -E2BIG. Fixes:0dcac27254
("bpf: Add multi kprobe link") Signed-off-by: Hou Tao <houtao1@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20231215100708.2265609-3-houtao@huaweicloud.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -42,6 +42,7 @@
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rcu_dereference_protected(p, lockdep_is_held(&bpf_event_mutex))
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#define MAX_UPROBE_MULTI_CNT (1U << 20)
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#define MAX_KPROBE_MULTI_CNT (1U << 20)
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#ifdef CONFIG_MODULES
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struct bpf_trace_module {
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@ -2897,6 +2898,8 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
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cnt = attr->link_create.kprobe_multi.cnt;
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if (!cnt)
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return -EINVAL;
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if (cnt > MAX_KPROBE_MULTI_CNT)
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return -E2BIG;
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size = cnt * sizeof(*addrs);
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addrs = kvmalloc_array(cnt, sizeof(*addrs), GFP_KERNEL);
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