[ 83/95] dmi: Feed DMI table to /dev/random driver

From: Ben Hutchings
Date: Sun Sep 09 2012 - 19:31:53 EST

3.2-stable review patch. If anyone has any objections, please let me know.


From: Tony Luck <tony.luck@xxxxxxxxx>

commit d114a33387472555188f142ed8e98acdb8181c6d upstream.

Send the entire DMI (SMBIOS) table to the /dev/random driver to
help seed its pools.

Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
drivers/firmware/dmi_scan.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 153980b..b298158 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -6,6 +6,7 @@
#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/bootmem.h>
+#include <linux/random.h>
#include <asm/dmi.h>

@@ -111,6 +112,8 @@ static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,

dmi_table(buf, dmi_len, dmi_num, decode, NULL);

+ add_device_randomness(buf, dmi_len);
dmi_iounmap(buf, dmi_len);
return 0;

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/