linux-kernel - Re: [PATCH v4 01/13] buildid: Only consider GNU notes for build ID parsing

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Date:   Tue, 13 Apr 2021 16:34:06 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Jessica Yu <jeyu@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>
Subject: Re: [PATCH v4 01/13] buildid: Only consider GNU notes for build ID
 parsing

On Fri 2021-04-09 18:52:48, Stephen Boyd wrote:
> Some kernel elf files have various notes that also happen to have an elf
> note type of '3', which matches NT_GNU_BUILD_ID but the note name isn't
> "GNU". For example, this note trips up the existing logic:
> 
>  Owner  Data size   Description
>  Xen    0x00000008  Unknown note type: (0x00000003) description data: 00 00 00 ffffff80 ffffffff ffffffff ffffffff ffffffff
> 
> Let's make sure that it is a GNU note when parsing the build ID so that
> we can use this function to parse a vmlinux's build ID too.
> 
> Reported-by: Petr Mladek <pmladek@...e.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Jessica Yu <jeyu@...nel.org>
> Cc: Evan Green <evgreen@...omium.org>
> Cc: Hsin-Yi Wang <hsinyi@...omium.org>
> Fixes: bd7525dacd7e ("bpf: Move stack_map_get_build_id into lib")
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>

Tested-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr