forked from mirrors/linux
0833952c07
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>
44 lines
1.4 KiB
Python
44 lines
1.4 KiB
Python
# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright 2024 Canonical Ltd.
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#
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# Authors:
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# Kuan-Ying Lee <kuan-ying.lee@canonical.com>
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#
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import gdb
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from linux import constants, mm
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def help():
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t = """Usage: lx-kasan_mem_to_shadow [Hex memory addr]
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Example:
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lx-kasan_mem_to_shadow 0xffff000008eca008\n"""
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gdb.write("Unrecognized command\n")
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raise gdb.GdbError(t)
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class KasanMemToShadow(gdb.Command):
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"""Translate memory address to kasan shadow address"""
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p_ops = None
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def __init__(self):
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if constants.LX_CONFIG_KASAN_GENERIC or constants.LX_CONFIG_KASAN_SW_TAGS:
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super(KasanMemToShadow, self).__init__("lx-kasan_mem_to_shadow", gdb.COMMAND_SUPPORT)
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def invoke(self, args, from_tty):
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if not constants.LX_CONFIG_KASAN_GENERIC or constants.LX_CONFIG_KASAN_SW_TAGS:
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raise gdb.GdbError('CONFIG_KASAN_GENERIC or CONFIG_KASAN_SW_TAGS is not set')
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argv = gdb.string_to_argv(args)
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if len(argv) == 1:
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if self.p_ops is None:
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self.p_ops = mm.page_ops().ops
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addr = int(argv[0], 16)
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shadow_addr = self.kasan_mem_to_shadow(addr)
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gdb.write('shadow addr: 0x%x\n' % shadow_addr)
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else:
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help()
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def kasan_mem_to_shadow(self, addr):
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return (addr >> self.p_ops.KASAN_SHADOW_SCALE_SHIFT) + self.p_ops.KASAN_SHADOW_OFFSET
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KasanMemToShadow()
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