linux-kernel - Re: [PATCH v11 09/14] module: Move kallsyms support into a separate file

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Date:   Tue, 28 Jun 2022 00:05:26 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Aaron Tomlin <atomlin@...hat.com>
Cc:     mcgrof@...nel.org, christophe.leroy@...roup.eu, cl@...ux.com,
        mbenes@...e.cz, akpm@...ux-foundation.org, jeyu@...nel.org,
        linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org,
        void@...ifault.com, atomlin@...mlin.com, allen.lkml@...il.com,
        joe@...ches.com, msuchanek@...e.de, oleksandr@...alenko.name,
        jason.wessel@...driver.com, pmladek@...e.com,
        daniel.thompson@...aro.org, hch@...radead.org,
        Chuck Lever III <chuck.lever@...cle.com>
Subject: Re: [PATCH v11 09/14] module: Move kallsyms support into a separate
 file

On Thu, 10 Mar 2022 10:24:08 +0000
Aaron Tomlin <atomlin@...hat.com> wrote:

> No functional change.
> 

And this too has a functional change as well.

Reported-by: Chuck Lever III <chuck.lever@...cle.com>
Link: https://lore.kernel.org/all/355D2478-33D3-4046-8422-E512F42C51BC@oracle.com/


Before this patch:

 # grep -a '^[0-9a-f]* [^a-zA-Z]' /proc/kallsyms

Nothing.

After this patch:

 # grep -a '^[0-9a-f]* [^a-zA-Z]' /proc/kallsyms
ffffffffc09df024 ^@ _note_9     [ebtables]
ffffffffc09df03c ^@ _note_8     [ebtables]
ffffffffc0e25024 ^@ _note_9     [bridge]
ffffffffc0e2503c ^@ _note_8     [bridge]
ffffffffc0e01000 ^@ br_switchdev_event  [bridge]
ffffffffc0e39548 ^@ __warned.10 [bridge]
ffffffffc09bd024 ^@ _note_9     [stp]
ffffffffc09bd03c ^@ _note_8     [stp]
ffffffffc0849024 ^@ _note_9     [vmw_vmci]
ffffffffc084903c ^@ _note_8     [vmw_vmci]
ffffffffc0849454 ^@ __kstrtab_vmci_context_get_priv_flags       [vmw_vmci]
ffffffffc0849470 ^@ __kstrtabns_vmci_context_get_priv_flags     [vmw_vmci]
ffffffffc0849054 ^@ __ksymtab_vmci_context_get_priv_flags       [vmw_vmci]
ffffffffc081d024 ^@ _note_9     [nf_reject_ipv6]
ffffffffc081d03c ^@ _note_8     [nf_reject_ipv6]
ffffffffc081d0a8 ^@ __kstrtab_nf_reject_skb_v6_tcp_reset        [nf_reject_ipv6]
ffffffffc081d0c3 ^@ __kstrtabns_nf_reject_skb_v6_tcp_reset      [nf_reject_ipv6]
ffffffffc081d078 ^@ __ksymtab_nf_reject_skb_v6_tcp_reset        [nf_reject_ipv6]
ffffffffc081d0c4 ^@ __kstrtab_nf_reject_skb_v6_unreach  [nf_reject_ipv6]

The kallsyms get corrupted output, and this breaks trace-cmd.

-- Steve


> This patch migrates kallsyms code out of core module
> code kernel/module/kallsyms.c
> 
> Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
> ---
>  kernel/module/Makefile   |   1 +
>  kernel/module/internal.h |  29 +++
>  kernel/module/kallsyms.c | 502 ++++++++++++++++++++++++++++++++++++
>  kernel/module/main.c     | 531 +--------------------------------------
>  4 files changed, 538 insertions(+), 525 deletions(-)
>  create mode 100644 kernel/module/kallsyms.c
>