Public bug reported:
[Impact]
On ARM64 systems with smbios v2.0, lscpu segfaults. This is caused by the fact
that lspci issues a read() on /dev/mem at the offset where it expects to find
the SMBIOS structure array. However, this
region is classified as EFI_RUNTIME_SERVICE_DATA (as per the UEFI spec), and so
it is omitted from the linear mapping.
[Test]
The issue was observed with kexec/kdump usecases when a FPDT ACPI table is
presented to HLOS from the firmware.
[Fix]
Fixed upstream:
1151f838cb62 arm64: kernel: restrict /dev/mem read() calls to linear region
[Regression Potential]
The patch is confined to ARM64 arch, and applies only to systems with SMBIOS
v2.0. Risk is low.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Manoj Iyer (manjo)
Status: Incomplete
** Tags: qdf2400 zesty
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https://bugs.launchpad.net/bugs/1716483
Title:
[SRU][Zesty] Fix lscpu segfault on ARM64 with SMBIOS v2.0
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
On ARM64 systems with smbios v2.0, lscpu segfaults. This is caused by the
fact that lspci issues a read() on /dev/mem at the offset where it expects to
find the SMBIOS structure array. However, this
region is classified as EFI_RUNTIME_SERVICE_DATA (as per the UEFI spec), and
so it is omitted from the linear mapping.
[Test]
The issue was observed with kexec/kdump usecases when a FPDT ACPI table is
presented to HLOS from the firmware.
[Fix]
Fixed upstream:
1151f838cb62 arm64: kernel: restrict /dev/mem read() calls to linear region
[Regression Potential]
The patch is confined to ARM64 arch, and applies only to systems with SMBIOS
v2.0. Risk is low.
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