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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/os/linux/sched.c
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@@ -454,6 +454,7 @@ long gk20a_sched_dev_ioctl(struct file *filp, unsigned int cmd,
return -EFAULT;
}
nvgpu_speculation_barrier();
switch (cmd) {
case NVGPU_SCHED_IOCTL_GET_TSGS:
err = gk20a_sched_dev_ioctl_get_tsgs(sched,