[SECURITY] mm: add mmap_min_addr check in expand_downwards (CVE-2019-9213)#124
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Mifacopy wants to merge 1 commit intofacebookincubator:oculus-go-kernel-masterfrom
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[SECURITY] mm: add mmap_min_addr check in expand_downwards (CVE-2019-9213)#124Mifacopy 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-2019-9213.
Upstream commit: 0a1d52994d440e21def1c2174932410b4f2a98a1
In the mm subsystem, expand_downwards() lacked a validation check for
mmap_min_addr, which could allow a local user on non-SMAP platforms to
more easily trigger a NULL pointer dereference in the kernel, leading to a
denial of service (kernel crash).
This patch adds the necessary check for the minimum mmap address to
prevent unintended NULL pointer dereferences.
Reference: CVE-2019-9213