Reloc shifts are implemented (see assignment of u32 reloc_addr in
do_relocs), and they are required for VIC job submissions.
On 23.05.2017 03:14, Dmitry Osipenko wrote:
Incorrectly shifted relocation address will cause a lower memory corruption
and likely a hang on a write or a read of an arbitrary data in case of IOMMU
absent. As of now there is no use for the address shifting (at least on
Tegra20) and adding a proper shifting / sizes validation is much more work.
Let's forbid it in the firewall till a proper validation is implemented.
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/gpu/host1x/job.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/host1x/job.c b/drivers/gpu/host1x/job.c
index 190353944d23..1a1568e64ba8 100644
--- a/drivers/gpu/host1x/job.c
+++ b/drivers/gpu/host1x/job.c
@@ -332,6 +332,10 @@ static bool check_reloc(struct host1x_reloc *reloc, struct host1x_bo *cmdbuf,
if (reloc->cmdbuf.bo != cmdbuf || reloc->cmdbuf.offset != offset)
return false;
+ /* relocation shift value validation isn't implemented yet */
+ if (reloc->shift)
+ return false;
+
return true;
}
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