This patch checks if the process that opens the /dev/kfd device is 32-bit
process. If so, it returns -EPERM and prints a warning message in dmesg.
This is done to prevent 32-bit user processes from using amdkfd, and hence, HSA
features.
AMD's HSA userspace stack will also support only 64-bit processes on Linux.
Signed-off-by: Oded Gabbay <oded.gabbay@xxxxxxx>
---
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 102cd36..4f7b275 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -102,15 +102,26 @@ struct device *kfd_chardev(void)
static int kfd_open(struct inode *inode, struct file *filep)
{
struct kfd_process *process;
+ bool is_32bit_user_mode;
if (iminor(inode) != 0)
return -ENODEV;
+ is_32bit_user_mode = is_compat_task();
+
+ if (is_32bit_user_mode == true) {
+ dev_warn(kfd_device,
+ "Process %d (32-bit) failed to open /dev/kfd\n"
+ "32-bit processes are not supported by amdkfd\n",
+ current->pid);
+ return -EPERM;
+ }
+
process = kfd_create_process(current);
if (IS_ERR(process))
return PTR_ERR(process);
- process->is_32bit_user_mode = is_compat_task();
+ process->is_32bit_user_mode = is_32bit_user_mode;
dev_dbg(kfd_device, "process %d opened, compat mode (32 bit) - %d\n",
process->pasid, process->is_32bit_user_mode);
--
2.1.0
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