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Subject: Re: [PATCH v2] ACPI: scan: Fix a Hyper-V Linux VM panic caused by
 buffer overflow
To:     decui@microsoft.com, rafael@kernel.org, linux-acpi@vger.kernel.org,
        rjw@rjwysocki.net, len.brown@intel.com, mikelley@microsoft.com
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References: <20210108072348.34091-1-decui@microsoft.com>
From:   Jethro Beekman <jethro@fortanix.com>
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On 2021-01-08 08:23, Dexuan Cui wrote:
> Linux VM on Hyper-V crashes with the latest mainline:
>=20
> [    4.069624] detected buffer overflow in strcpy
> [    4.077733] kernel BUG at lib/string.c:1149!
> ..
> [    4.085819] RIP: 0010:fortify_panic+0xf/0x11
> ...
> [    4.085819] Call Trace:
> [    4.085819]  acpi_device_add.cold.15+0xf2/0xfb
> [    4.085819]  acpi_add_single_object+0x2a6/0x690
> [    4.085819]  acpi_bus_check_add+0xc6/0x280
> [    4.085819]  acpi_ns_walk_namespace+0xda/0x1aa
> [    4.085819]  acpi_walk_namespace+0x9a/0xc2
> [    4.085819]  acpi_bus_scan+0x78/0x90
> [    4.085819]  acpi_scan_init+0xfa/0x248
> [    4.085819]  acpi_init+0x2c1/0x321
> [    4.085819]  do_one_initcall+0x44/0x1d0
> [    4.085819]  kernel_init_freeable+0x1ab/0x1f4
>=20
> This is because of the recent buffer overflow detection in the
> commit 6a39e62abbaf ("lib: string.h: detect intra-object overflow in fo=
rtified string functions")
>=20
> Here acpi_device_bus_id->bus_id can only hold 14 characters, while the
> the acpi_device_hid(device) returns a 22-char string
> "HYPER_V_GEN_COUNTER_V1".
>=20
> Per ACPI Spec v6.2, Section 6.1.5 _HID (Hardware ID), if the ID is a
> string, it must be of the form AAA#### or NNNN####, i.e. 7 chars or 8
> chars.
>=20
> The field bus_id in struct acpi_device_bus_id was originally defined as=

> char bus_id[9], and later was enlarged to char bus_id[15] in 2007 in th=
e
> commit bb0958544f3c ("ACPI: use more understandable bus_id for ACPI dev=
ices")
>=20
> Fix the issue by changing the field bus_id to const char *, and use
> kstrdup_const() to initialize it.
>=20
> Signed-off-by: Dexuan Cui <decui@microsoft.com>

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=3D210449
Tested-By: Jethro Beekman <jethro@fortanix.com>

--
Jethro Beekman | Fortanix


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