Since SID's content is constant over reboot, it must not be used
as source of randomness.
This patch remove the use of SID content as source of randomness.
Signed-off-by: Corentin Labbe <clabbe.montjoie@xxxxxxxxx>
---
drivers/nvmem/sunxi_sid.c | 21 ---------------------
1 file changed, 21 deletions(-)
diff --git a/drivers/nvmem/sunxi_sid.c b/drivers/nvmem/sunxi_sid.c
index 1567ccc..c82d5d1 100644
--- a/drivers/nvmem/sunxi_sid.c
+++ b/drivers/nvmem/sunxi_sid.c
@@ -21,8 +21,6 @@
#include <linux/nvmem-provider.h>
#include <linux/of.h>
#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/random.h>
static struct nvmem_config econfig = {
.name = "sunxi-sid",
@@ -70,8 +68,6 @@ static int sunxi_sid_probe(struct platform_device *pdev)
struct resource *res;
struct nvmem_device *nvmem;
struct sunxi_sid *sid;
- int ret, i, size;
- char *randomness;
sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);
if (!sid)
@@ -82,7 +78,6 @@ static int sunxi_sid_probe(struct platform_device *pdev)
if (IS_ERR(sid->base))
return PTR_ERR(sid->base);
- size = resource_size(res) - 1;
econfig.size = resource_size(res);
econfig.dev = dev;
econfig.reg_read = sunxi_sid_read;
@@ -91,25 +86,9 @@ static int sunxi_sid_probe(struct platform_device *pdev)
if (IS_ERR(nvmem))
return PTR_ERR(nvmem);
- randomness = kzalloc(sizeof(u8) * (size), GFP_KERNEL);
- if (!randomness) {
- ret = -EINVAL;
- goto err_unreg_nvmem;
- }
-
- for (i = 0; i < size; i++)
- randomness[i] = sunxi_sid_read_byte(sid, i);
-
- add_device_randomness(randomness, size);
- kfree(randomness);
-
platform_set_drvdata(pdev, nvmem);
return 0;
-
-err_unreg_nvmem:
- nvmem_unregister(nvmem);
- return ret;
}
static int sunxi_sid_remove(struct platform_device *pdev)
--
2.7.3
--
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