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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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2
drivers/gpu/nvgpu/os/linux/ioctl_tsg.c
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@@ -362,6 +362,7 @@ static int gk20a_tsg_event_id_ctrl(struct gk20a *g, struct tsg_gk20a *tsg,
if (args->event_id >= NVGPU_IOCTL_CHANNEL_EVENT_ID_MAX)
return -EINVAL;
nvgpu_speculation_barrier();
switch (args->cmd) {
case NVGPU_IOCTL_CHANNEL_EVENT_ID_CMD_ENABLE:
err = gk20a_tsg_event_id_enable(tsg, args->event_id, &fd);
@@ -575,6 +576,7 @@ static int gk20a_tsg_ioctl_read_single_sm_error_state(struct gk20a *g,
if (args->record_size > 0) {
size_t write_size = sizeof(*sm_error_state);
nvgpu_speculation_barrier();
if (write_size > args->record_size)
write_size = args->record_size;