accel/habanalabs: fix information leak in sec_attest_info()

[ Upstream commit a9f07790a4b2250f0140e9a61c7f842fd9b618c7 ]

This function may copy the pad0 field of struct hl_info_sec_attest to user
mode which has not been initialized, resulting in leakage of kernel heap
data to user mode. To prevent this, use kzalloc() to allocate and zero out
the buffer, which can also eliminate other uninitialized holes, if any.

Fixes: 0c88760f8f5e ("habanalabs/gaudi2: add secured attestation info uapi")
Signed-off-by: Xingyuan Mo <hdthky0@gmail.com>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/accel/habanalabs/common/habanalabs_ioctl.c b/drivers/accel/habanalabs/common/habanalabs_ioctl.c
index 6a45a92..a7f6c54 100644 (file)
--- a/drivers/accel/habanalabs/common/habanalabs_ioctl.c
+++ b/drivers/accel/habanalabs/common/habanalabs_ioctl.c
@@ -682,7 +682,7 @@ static int sec_attest_info(struct hl_fpriv *hpriv, struct hl_info_args *args)
        if (!sec_attest_info)
                return -ENOMEM;
 
-       info = kmalloc(sizeof(*info), GFP_KERNEL);
+       info = kzalloc(sizeof(*info), GFP_KERNEL);
        if (!info) {
                rc = -ENOMEM;
                goto free_sec_attest_info;