linux-kernel - Re: [PATCH v2] scripts/gdb/linux/symbols.py: address changes to module_sect

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <07414bd7-e93d-4d0c-b6fd-d9178df2a894@siemens.com>
Date: Wed, 26 Feb 2025 06:31:37 +0100
From: Jan Kiszka <jan.kiszka@...mens.com>
To: Antonio Quartulli <antonio@...delbit.com>, kbingham@...nel.org,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Thomas Weißschuh
 <linux@...ssschuh.net>
Subject: Re: [PATCH v2] scripts/gdb/linux/symbols.py: address changes to
 module_sect_attrs

On 21.02.25 21:40, Antonio Quartulli wrote:
> When loading symbols from kernel modules we used to iterate
> from 0 to module_sect_attrs::nsections, in order to
> retrieve their name and address.
> 
> However module_sect_attrs::nsections has been removed from
> the struct by a previous commit.
> 
> Re-arrange the iteration by accessing all items in
> module_sect_attrs::grp::bin_attrs[] until NULL is found
> (it's a NULL terminated array).
> 
> At the same time the symbol address cannot be extracted
> from module_sect_attrs::attrs[]::address anymore because
> it has also been deleted. Fetch it from
> module_sect_attrs::grp::bin_attrs[]::private as described
> in 4b2c11e4aaf7.
> 
> Fixes: d8959b947a8d ("module: sysfs: Drop member 'module_sect_attrs::nsections'")
> Fixes: 4b2c11e4aaf7 ("module: sysfs: Drop member 'module_sect_attr::address'")
> Cc: Thomas Weißschuh <linux@...ssschuh.net>
> Signed-off-by: Antonio Quartulli <antonio@...delbit.com>
> ---
> 
> Changes in v2:
> * changed attr['attr']['name'] to attr['attr']['name'].string() to
>   ensure extracted value is a string, otherwise an exception is thrown
> 
> 
>  scripts/gdb/linux/symbols.py | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/scripts/gdb/linux/symbols.py b/scripts/gdb/linux/symbols.py
> index f6c1b063775a..15d76f7d8ebc 100644
> --- a/scripts/gdb/linux/symbols.py
> +++ b/scripts/gdb/linux/symbols.py
> @@ -15,6 +15,7 @@ import gdb
>  import os
>  import re
>  
> +from itertools import count
>  from linux import modules, utils, constants
>  
>  
> @@ -95,10 +96,14 @@ lx-symbols command."""
>          except gdb.error:
>              return str(module_addr)
>  
> -        attrs = sect_attrs['attrs']
> -        section_name_to_address = {
> -            attrs[n]['battr']['attr']['name'].string(): attrs[n]['address']
> -            for n in range(int(sect_attrs['nsections']))}
> +        section_name_to_address = {}
> +        for i in count():
> +            # this is a NULL terminated array
> +            if sect_attrs['grp']['bin_attrs'][i] == 0x0:
> +                break
> +
> +            attr = sect_attrs['grp']['bin_attrs'][i].dereference()
> +            section_name_to_address[attr['attr']['name'].string()] = attr['private']
>  
>          textaddr = section_name_to_address.get(".text", module_addr)
>          args = []

Reviewed-by: Jan Kiszka <jan.kiszka@...mens.com>

Thanks,
Jan

-- 
Siemens AG, Foundational Technologies
Linux Expert Center