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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
(cherry picked from commit f0762ed483)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/1996052
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: Deepak Nibade <dnibade@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 bbef4c6927
commit f56874aec2
13 changed files with 589 additions and 0 deletions
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2
drivers/gpu/nvgpu/os/linux/ioctl_as.c
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@@ -170,6 +170,7 @@ static int gk20a_as_ioctl_map_buffer_batch(
nvgpu_vm_unmap(as_share->vm, unmap_args.offset, &batch);
}
nvgpu_speculation_barrier();
if (err) {
nvgpu_vm_mapping_batch_finish(as_share->vm, &batch);
@@ -355,6 +356,7 @@ long gk20a_as_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (err)
return err;
nvgpu_speculation_barrier();
switch (cmd) {
case NVGPU_AS_IOCTL_BIND_CHANNEL:
trace_gk20a_as_ioctl_bind_channel(g->name);