[PATCH v2] scripts/gdb/linux/symbols.py: address changes to module_sect_attrs

From: Antonio Quartulli
Date: Fri Feb 21 2025 - 15:41:25 EST


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@xxxxxxxxxxxxxx>
Signed-off-by: Antonio Quartulli <antonio@xxxxxxxxxxxxx>
---

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