The patch titled
Subject: scripts/gdb/modules: add get module text support
has been added to the -mm mm-nonmm-unstable branch. Its filename is
scripts-gdb-modules-add-get-module-text-support.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scripts-gdb-modules-add-get-module-text-support.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
Subject: scripts/gdb/modules: add get module text support
Date: Tue, 25 Jul 2023 17:34:52 +0800
When we get an text address from coredump and we cannot find
this address in vmlinux, it might located in kernel module.
We want to know which kernel module it located in.
This GDB scripts can help us to find the target kernel module.
(gdb) lx-getmod-by-textaddr 0xffff800002d305ac
0xffff800002d305ac is in kasan_test.ko
Link: https://lkml.kernel.org/r/20230725093458.30064-3-Kuan-Ying.Lee@xxxxxxxxxxxx
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Cc: Chinwen Chang <chinwen.chang@xxxxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Qun-Wei Lin <qun-wei.lin@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/gdb/linux/modules.py | 32 +++++++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)
--- a/scripts/gdb/linux/modules.py~scripts-gdb-modules-add-get-module-text-support
+++ a/scripts/gdb/linux/modules.py
@@ -91,5 +91,35 @@ class LxLsmod(gdb.Command):
gdb.write("\n")
-
LxLsmod()
+
+def help():
+ t = """Usage: lx-getmod-by-textaddr [Heximal Address]
+ Example: lx-getmod-by-textaddr 0xffff800002d305ac\n"""
+ gdb.write("Unrecognized command\n")
+ raise gdb.GdbError(t)
+
+class LxFindTextAddrinMod(gdb.Command):
+ '''Look up loaded kernel module by text address.'''
+
+ def __init__(self):
+ super(LxFindTextAddrinMod, self).__init__('lx-getmod-by-textaddr', gdb.COMMAND_SUPPORT)
+
+ def invoke(self, arg, from_tty):
+ args = gdb.string_to_argv(arg)
+
+ if len(args) != 1:
+ help()
+
+ addr = gdb.Value(int(args[0], 16)).cast(utils.get_ulong_type())
+ for mod in module_list():
+ mod_text_start = mod['mem'][constants.LX_MOD_TEXT]['base']
+ mod_text_end = mod_text_start + mod['mem'][constants.LX_MOD_TEXT]['size'].cast(utils.get_ulong_type())
+
+ if addr >= mod_text_start and addr < mod_text_end:
+ s = "0x%x" % addr + " is in " + mod['name'].string() + ".ko\n"
+ gdb.write(s)
+ return
+ gdb.write("0x%x is not in any module text section\n" % addr)
+
+LxFindTextAddrinMod()
_
Patches currently in -mm which might be from Kuan-Ying.Lee@xxxxxxxxxxxx are
scripts-gdb-symbols-add-specific-ko-module-load-command.patch
scripts-gdb-modules-add-get-module-text-support.patch
scripts-gdb-utils-add-common-type-usage.patch
scripts-gdb-aarch64-add-aarch64-page-operation-helper-commands-and-configs.patch
scripts-gdb-stackdepot-add-stackdepot-support.patch
scripts-gdb-page_owner-add-page-owner-support.patch
scripts-gdb-slab-add-slab-support.patch
scripts-gdb-vmalloc-add-vmallocinfo-support.patch
