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scripts/gdb: add 'lx-kasan_mem_to_shadow' command

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This command allows users to quickly translate memory address to the kasan
shadow memory address.

Example output:
(gdb) lx-kasan_mem_to_shadow 0xffff000019acc008
shadow addr: 0xffff600003359801

Link: https://lkml.kernel.org/r/20240723064902.124154-6-kuan-ying.lee@canonical.com
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kuan-Ying Lee 2024-07-23 14:49:01 +08:00 committed by Andrew Morton
parent 35249f68b5
commit 0833952c07
2 changed files with 45 additions and 0 deletions
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44
scripts/gdb/linux/kasan.py Normal file
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@ -0,0 +1,44 @@
# SPDX-License-Identifier: GPL-2.0
#
# Copyright 2024 Canonical Ltd.
#
# Authors:
# Kuan-Ying Lee <kuan-ying.lee@canonical.com>
#
import gdb
from linux import constants, mm
def help():
t = """Usage: lx-kasan_mem_to_shadow [Hex memory addr]
Example:
lx-kasan_mem_to_shadow 0xffff000008eca008\n"""
gdb.write("Unrecognized command\n")
raise gdb.GdbError(t)
class KasanMemToShadow(gdb.Command):
"""Translate memory address to kasan shadow address"""
p_ops = None
def __init__(self):
if constants.LX_CONFIG_KASAN_GENERIC or constants.LX_CONFIG_KASAN_SW_TAGS:
super(KasanMemToShadow, self).__init__("lx-kasan_mem_to_shadow", gdb.COMMAND_SUPPORT)
def invoke(self, args, from_tty):
if not constants.LX_CONFIG_KASAN_GENERIC or constants.LX_CONFIG_KASAN_SW_TAGS:
raise gdb.GdbError('CONFIG_KASAN_GENERIC or CONFIG_KASAN_SW_TAGS is not set')
argv = gdb.string_to_argv(args)
if len(argv) == 1:
if self.p_ops is None:
self.p_ops = mm.page_ops().ops
addr = int(argv[0], 16)
shadow_addr = self.kasan_mem_to_shadow(addr)
gdb.write('shadow addr: 0x%x\n' % shadow_addr)
else:
help()
def kasan_mem_to_shadow(self, addr):
return (addr >> self.p_ops.KASAN_SHADOW_SCALE_SHIFT) + self.p_ops.KASAN_SHADOW_OFFSET
KasanMemToShadow()

1
scripts/gdb/vmlinux-gdb.py
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@ -49,3 +49,4 @@ else:
import linux.page_owner import linux.page_owner
import linux.slab import linux.slab
import linux.vmalloc import linux.vmalloc
import linux.kasan