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scripts/gdb/modules: add get module text support

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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/20230808083020.22254-3-Kuan-Ying.Lee@mediatek.com
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Qun-Wei Lin <qun-wei.lin@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kuan-Ying Lee 2023-08-08 16:30:12 +08:00 committed by Andrew Morton
parent 11f956538c
commit 82141540c3
1 changed files with 31 additions and 1 deletions
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32
scripts/gdb/linux/modules.py
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@ -97,5 +97,35 @@ 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()