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(parent: f889491) | patch
virtio-console: avoid DMA from stack
authorOmar Sandoval <osandov@fb.com>
Wed, 1 Feb 2017 08:02:27 +0000 (00:02 -0800)
committerMichael S. Tsirkin <mst@redhat.com>
Wed, 1 Mar 2017 23:35:06 +0000 (01:35 +0200)
commitc4baad50297d84bde1a7ad45e50c73adae4a2192
tree2efdf37fc4b48748d19ed2e3cb8a75908581fd26tree | snapshot (tar.gz zip)
parentf889491380582b4ba2981cf0b0d7d6a40fb30ab7commit | diff
virtio-console: avoid DMA from stack

put_chars() stuffs the buffer it gets into an sg, but that buffer may be
on the stack. This breaks with CONFIG_VMAP_STACK=y (for me, it
manifested as printks getting turned into NUL bytes).

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
drivers/char/virtio_console.c diff | blob | blame | history