[SECURITY] x86/acpi: prevent OOB in mp_override_legacy_irq() (CVE-2017-11473)#125
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Mifacopy wants to merge 1 commit intofacebookincubator:oculus-go-kernel-masterfrom
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[SECURITY] x86/acpi: prevent OOB in mp_override_legacy_irq() (CVE-2017-11473)#125Mifacopy wants to merge 1 commit intofacebookincubator:oculus-go-kernel-masterfrom
Mifacopy wants to merge 1 commit intofacebookincubator:oculus-go-kernel-masterfrom
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Fix CVE-2017-11473.
Upstream commit: dad5ab0db8deac535d03e3fe3d8f2892173fa6a4
mp_override_legacy_irq() used the ACPI-provided bus_irq value as an index into
isa_irq_to_gsi[] without sanity checking. Broken or malicious ACPI tables could
cause out-of-bounds memory access, leading to malfunction, kernel panic, or
potential arbitrary code execution.
Add a boundary check (bus_irq >= NR_IRQS_LEGACY) and warn+return on invalid input.
Reference: CVE-2017-11473