46 lines
2.3 KiB
Diff
46 lines
2.3 KiB
Diff
From 7412918d8716fc10e8ba64aa2c97f3e09a9f4569 Mon Sep 17 00:00:00 2001
|
|
From: Masahiro Matsuya <mmatsuya@redhat.com>
|
|
Date: Sat, 29 Oct 2016 08:35:26 +0900
|
|
Subject: [PATCH] bz1374141 fix incorrect mask for ppc64
|
|
|
|
The netmask configured in firmware is not respected on ppc64 (big endian).
|
|
When 255.255.252.0 is set as netmask in firmware, the following is the value of bootpath string in grub_ieee1275_parse_bootpath().
|
|
|
|
/vdevice/l-lan@30000002:speed=auto,duplex=auto,192.168.88.10,,192.168.89.113,192.168.88.1,5,5,255.255.252.0,512
|
|
|
|
The netmask in this bootpath is no problem, since it's a value specified in firmware. But,
|
|
The value of 'subnet_mask.ipv4' was set with 0xfffffc00, and __builtin_ctz (~grub_le_to_cpu32 (subnet_mask.ipv4)) returned 16 (not 22).
|
|
As a result, 16 was used for netmask wrongly.
|
|
|
|
1111 1111 1111 1111 1111 1100 0000 0000 # subnet_mask.ipv4 (=0xfffffc00)
|
|
0000 0000 1111 1100 1111 1111 1111 1111 # grub_le_to_cpu32 (subnet_mask.ipv4)
|
|
1111 1111 0000 0011 0000 0000 0000 0000 # ~grub_le_to_cpu32 (subnet_mask.ipv4)
|
|
|
|
And, the count of zero with __builtin_ctz can be 16.
|
|
This patch changes it as below.
|
|
|
|
1111 1111 1111 1111 1111 1100 0000 0000 # subnet_mask.ipv4 (=0xfffffc00)
|
|
0000 0000 1111 1100 1111 1111 1111 1111 # grub_le_to_cpu32 (subnet_mask.ipv4)
|
|
1111 1111 1111 1111 1111 1100 0000 0000 # grub_swap_bytes32(grub_le_to_cpu32 (subnet_mask.ipv4))
|
|
0000 0000 0000 0000 0000 0011 1111 1111 # ~grub_swap_bytes32(grub_le_to_cpu32 (subnet_mask.ipv4))
|
|
|
|
The count of zero with __builtin_clz can be 22. (clz counts the number of one bits preceding the most significant zero bit)
|
|
---
|
|
grub-core/net/drivers/ieee1275/ofnet.c | 3 +--
|
|
1 file changed, 1 insertion(+), 2 deletions(-)
|
|
|
|
diff --git a/grub-core/net/drivers/ieee1275/ofnet.c b/grub-core/net/drivers/ieee1275/ofnet.c
|
|
index 002446be1c3..3df75357a70 100644
|
|
--- a/grub-core/net/drivers/ieee1275/ofnet.c
|
|
+++ b/grub-core/net/drivers/ieee1275/ofnet.c
|
|
@@ -220,8 +220,7 @@ grub_ieee1275_parse_bootpath (const char *devpath, char *bootpath,
|
|
flags);
|
|
inter->vlantag = vlantag;
|
|
grub_net_add_ipv4_local (inter,
|
|
- __builtin_ctz (~grub_le_to_cpu32 (subnet_mask.ipv4)));
|
|
-
|
|
+ __builtin_clz (~grub_swap_bytes32(grub_le_to_cpu32 (subnet_mask.ipv4))));
|
|
}
|
|
|
|
if (gateway_addr.ipv4 != 0)
|