On Thu, 16 Aug 2018 15:30:38 -0500 "Gustavo A. R. Silva" <gust...@embeddedor.com> wrote:
> vsa.console is indirectly controlled by user-space, hence leading to > a potential exploitation of the Spectre variant 1 vulnerability. > > This issue was detected with the help of Smatch: > > drivers/tty/vt/vt_ioctl.c:711 vt_ioctl() warn: potential spectre issue > 'vc_cons' [r] > > Fix this by sanitizing vsa.console before using it to index vc_cons > > Notice that given that speculation windows are large, the policy is > to kill the speculation on the first load and not worry if it can be > completed with a dependent load/store [1]. > > [1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2 > > Cc: sta...@vger.kernel.org > Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com> Reviewed-by: Alan Cox <a...@linux.intel.com> Alan
