1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # 2 #
3 # Copyright 2024 Canonical Ltd. 3 # Copyright 2024 Canonical Ltd.
4 # 4 #
5 # Authors: 5 # Authors:
6 # Kuan-Ying Lee <kuan-ying.lee@canonical.com> 6 # Kuan-Ying Lee <kuan-ying.lee@canonical.com>
7 # 7 #
8 8
9 import gdb 9 import gdb
10 from linux import constants, mm 10 from linux import constants, mm
11 11
12 def help(): 12 def help():
13 t = """Usage: lx-kasan_mem_to_shadow [Hex 13 t = """Usage: lx-kasan_mem_to_shadow [Hex memory addr]
14 Example: 14 Example:
15 lx-kasan_mem_to_shadow 0xffff000008eca 15 lx-kasan_mem_to_shadow 0xffff000008eca008\n"""
16 gdb.write("Unrecognized command\n") 16 gdb.write("Unrecognized command\n")
17 raise gdb.GdbError(t) 17 raise gdb.GdbError(t)
18 18
19 class KasanMemToShadow(gdb.Command): 19 class KasanMemToShadow(gdb.Command):
20 """Translate memory address to kasan shado 20 """Translate memory address to kasan shadow address"""
21 21
22 p_ops = None 22 p_ops = None
23 23
24 def __init__(self): 24 def __init__(self):
25 if constants.LX_CONFIG_KASAN_GENERIC o 25 if constants.LX_CONFIG_KASAN_GENERIC or constants.LX_CONFIG_KASAN_SW_TAGS:
26 super(KasanMemToShadow, self).__in 26 super(KasanMemToShadow, self).__init__("lx-kasan_mem_to_shadow", gdb.COMMAND_SUPPORT)
27 27
28 def invoke(self, args, from_tty): 28 def invoke(self, args, from_tty):
29 if not constants.LX_CONFIG_KASAN_GENER 29 if not constants.LX_CONFIG_KASAN_GENERIC or constants.LX_CONFIG_KASAN_SW_TAGS:
30 raise gdb.GdbError('CONFIG_KASAN_G 30 raise gdb.GdbError('CONFIG_KASAN_GENERIC or CONFIG_KASAN_SW_TAGS is not set')
31 31
32 argv = gdb.string_to_argv(args) 32 argv = gdb.string_to_argv(args)
33 if len(argv) == 1: 33 if len(argv) == 1:
34 if self.p_ops is None: 34 if self.p_ops is None:
35 self.p_ops = mm.page_ops().ops 35 self.p_ops = mm.page_ops().ops
36 addr = int(argv[0], 16) 36 addr = int(argv[0], 16)
37 shadow_addr = self.kasan_mem_to_sh 37 shadow_addr = self.kasan_mem_to_shadow(addr)
38 gdb.write('shadow addr: 0x%x\n' % 38 gdb.write('shadow addr: 0x%x\n' % shadow_addr)
39 else: 39 else:
40 help() 40 help()
41 def kasan_mem_to_shadow(self, addr): 41 def kasan_mem_to_shadow(self, addr):
42 return (addr >> self.p_ops.KASAN_SHADO 42 return (addr >> self.p_ops.KASAN_SHADOW_SCALE_SHIFT) + self.p_ops.KASAN_SHADOW_OFFSET
43 43
44 KasanMemToShadow() 44 KasanMemToShadow()
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.