netdev - Re: [PATCH bpf] bpf: fix bpf_prog_get_info_by_fd to return 0 func

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Message-ID: <20181102205453.7yzrgfvfmzbmvdf4@ast-mbp.dhcp.thefacebook.com>
Date:   Fri, 2 Nov 2018 13:54:54 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     ast@...nel.org, netdev@...r.kernel.org,
        Sandipan Das <sandipan@...ux.vnet.ibm.com>,
        Song Liu <songliubraving@...com>
Subject: Re: [PATCH bpf] bpf: fix bpf_prog_get_info_by_fd to return 0
 func_lens for unpriv

On Fri, Nov 02, 2018 at 11:35:46AM +0100, Daniel Borkmann wrote:
> While dbecd7388476 ("bpf: get kernel symbol addresses via syscall")
> zeroed info.nr_jited_ksyms in bpf_prog_get_info_by_fd() for queries
> from unprivileged users, commit 815581c11cc2 ("bpf: get JITed image
> lengths of functions via syscall") forgot about doing so and therefore
> returns the #elems of the user set up buffer which is incorrect. It
> also needs to indicate a info.nr_jited_func_lens of zero.
> 
> Fixes: 815581c11cc2 ("bpf: get JITed image lengths of functions via syscall")
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Cc: Sandipan Das <sandipan@...ux.vnet.ibm.com>
> Cc: Song Liu <songliubraving@...com>

Applied, Thanks