1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Copyright 2024 Canonical Ltd.
4 #
5 # Authors:
6 # Kuan-Ying Lee <kuan-ying.lee@canonical.com>
7 #
8
9 import gdb
10 from linux import constants, mm
11
12 def help():
13 t = """Usage: lx-kasan_mem_to_shadow [Hex memory addr]
14 Example:
15 lx-kasan_mem_to_shadow 0xffff000008eca008\n"""
16 gdb.write("Unrecognized command\n")
17 raise gdb.GdbError(t)
18
19 class KasanMemToShadow(gdb.Command):
20 """Translate memory address to kasan shadow address"""
21
22 p_ops = None
23
24 def __init__(self):
25 if constants.LX_CONFIG_KASAN_GENERIC or constants.LX_CONFIG_KASAN_SW_TAGS:
26 super(KasanMemToShadow, self).__init__("lx-kasan_mem_to_shadow", gdb.COMMAND_SUPPORT)
27
28 def invoke(self, args, from_tty):
29 if not constants.LX_CONFIG_KASAN_GENERIC or constants.LX_CONFIG_KASAN_SW_TAGS:
30 raise gdb.GdbError('CONFIG_KASAN_GENERIC or CONFIG_KASAN_SW_TAGS is not set')
31
32 argv = gdb.string_to_argv(args)
33 if len(argv) == 1:
34 if self.p_ops is None:
35 self.p_ops = mm.page_ops().ops
36 addr = int(argv[0], 16)
37 shadow_addr = self.kasan_mem_to_shadow(addr)
38 gdb.write('shadow addr: 0x%x\n' % shadow_addr)
39 else:
40 help()
41 def kasan_mem_to_shadow(self, addr):
42 return (addr >> self.p_ops.KASAN_SHADOW_SCALE_SHIFT) + self.p_ops.KASAN_SHADOW_OFFSET
43
44 KasanMemToShadow()
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