[SECURITY] virtio-console: avoid DMA from stack (CVE-2017-8067)#121
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Mifacopy wants to merge 1 commit intofacebookincubator:oculus-go-kernel-masterfrom
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[SECURITY] virtio-console: avoid DMA from stack (CVE-2017-8067)#121Mifacopy 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-2017-8067.
Upstream commit: c4baad50297d84bde1a7ad45e50c73adae4a2192
virtio-console put_chars() may build a DMA scatterlist from a buffer that can
reside on the (vmap) stack. With CONFIG_VMAP_STACK enabled, this can span
multiple virtual pages and trigger incorrect DMA handling, leading to a
system crash or memory corruption.
This patch avoids DMA from stack by duplicating the buffer into kmalloc
memory before issuing the transfer.
Reference: CVE-2017-8067