virtio-console: avoid DMA from stack

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commit c4baad5029 upstream.

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>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Omar Sandoval 2017-02-01 00:02:27 -08:00 • committed by Greg Kroah-Hartman

parent fb00319317

commit 86c6667f6a

1 changed files with 10 additions and 2 deletions

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drivers/char/virtio_console.c

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