linux-kernel - Re: [PATCH bpf v2] bpftool: Don't crash on missing jited insns or ksyms

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Message-ID: <20191210125457.13f7821a@cakuba.netronome.com>
Date:   Tue, 10 Dec 2019 12:54:57 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        lkml <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Martin Lau <kafai@...com>
Subject: Re: [PATCH bpf v2] bpftool: Don't crash on missing jited insns or
 ksyms

On Tue, 10 Dec 2019 19:14:12 +0100, Toke Høiland-Jørgensen wrote:
> When the kptr_restrict sysctl is set, the kernel can fail to return
> jited_ksyms or jited_prog_insns, but still have positive values in
> nr_jited_ksyms and jited_prog_len. This causes bpftool to crash when trying
> to dump the program because it only checks the len fields not the actual
> pointers to the instructions and ksyms.
> 
> Fix this by adding the missing checks.
> 
> Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>

Fixes: 71bb428fe2c1 ("tools: bpf: add bpftool")

and

Fixes: f84192ee00b7 ("tools: bpftool: resolve calls without using imm field")

?