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# 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()
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