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Date: Fri, 4 Feb 2022 11:32:28 -0800 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Matteo Croce <mcroce@...ux.microsoft.com> Cc: bpf <bpf@...r.kernel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH bpf-next v3 1/2] bpf: limit bpf_core_types_are_compat() recursion On Thu, Feb 3, 2022 at 4:55 PM Matteo Croce <mcroce@...ux.microsoft.com> wrote: > + > + for (i = 0; i < local_vlen; i++, local_p++, targ_p++) { > + if (level <= 1) > + return -EINVAL; <= 1 is not correct, since it makes MAX_TYPES_ARE_COMPAT_DEPTH 2 misleading. With <= 1 the recursion depth is just 1. So I've changed to to <=0 to make the actual depth of 2.
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