linux-kernel - [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: <20250221204034.4430-1-antonio@mandelbit.com>
Date: Fri, 21 Feb 2025 21:40:34 +0100
From: Antonio Quartulli <antonio@...delbit.com>
To: jan.kiszka@...mens.com,
	kbingham@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Antonio Quartulli <antonio@...delbit.com>,
	Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH v2] scripts/gdb/linux/symbols.py: address changes to module_sect_attrs

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 = []
-- 
2.45.3