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gpu: nvgpu: add speculative barrier

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Data can be speculativerly stored and
code flow can be hijacked.

To mitigate this problem insert a
speculation barrier.

Bug 200447167

Change-Id: Ia865ff2add8b30de49aa970715625b13e8f71c08
Signed-off-by: Ranjanikar Nikhil Prabhakarrao <rprabhakarra@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1972221
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Ranjanikar Nikhil Prabhakarrao
2018-12-13 17:29:20 +05:30
committed by mobile promotions
parent 001dbdb2fc
commit f0762ed483
13 changed files with 43 additions and 0 deletions
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1
drivers/gpu/nvgpu/common/fifo/submit.c
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@@ -217,6 +217,7 @@ static int nvgpu_submit_append_gpfifo_user_direct(struct channel_gk20a *c,
u32 end = start + len; /* exclusive */
int err;
nvgpu_speculation_barrier();
if (end > gpfifo_size) {
/* wrap-around */
u32 length0 = gpfifo_size - start;