b99bc51d5e
OBS-URL: https://build.opensuse.org/request/show/591814 OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/grub2?expand=0&rev=179
41 lines
2.0 KiB
Diff
41 lines
2.0 KiB
Diff
From: Masahiro Matsuya <mmatsuya@redhat.com>
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The netmask configured in firmware is not respected on ppc64 (big endian).
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When 255.255.252.0 is set as netmask in firmware, the following is the value of bootpath string in grub_ieee1275_parse_bootpath().
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/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
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The netmask in this bootpath is no problem, since it's a value specified in firmware. But,
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The value of 'subnet_mask.ipv4' was set with 0xfffffc00, and __builtin_ctz (~grub_le_to_cpu32 (subnet_mask.ipv4)) returned 16 (not 22).
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As a result, 16 was used for netmask wrongly.
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1111 1111 1111 1111 1111 1100 0000 0000 # subnet_mask.ipv4 (=0xfffffc00)
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0000 0000 1111 1100 1111 1111 1111 1111 # grub_le_to_cpu32 (subnet_mask.ipv4)
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1111 1111 0000 0011 0000 0000 0000 0000 # ~grub_le_to_cpu32 (subnet_mask.ipv4)
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And, the count of zero with __builtin_ctz can be 16.
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This patch changes it as below.
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1111 1111 1111 1111 1111 1100 0000 0000 # subnet_mask.ipv4 (=0xfffffc00)
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0000 0000 1111 1100 1111 1111 1111 1111 # grub_le_to_cpu32 (subnet_mask.ipv4)
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1111 1111 1111 1111 1111 1100 0000 0000 # grub_swap_bytes32(grub_le_to_cpu32 (subnet_mask.ipv4))
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0000 0000 0000 0000 0000 0011 1111 1111 # ~grub_swap_bytes32(grub_le_to_cpu32 (subnet_mask.ipv4))
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The count of zero with __builtin_clz can be 22. (clz counts the number of one bits preceding the most significant zero bit)
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---
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grub-core/net/drivers/ieee1275/ofnet.c | 2 +-
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff -ur grub-2.02~/grub-core/net/drivers/ieee1275/ofnet.c grub-2.02/grub-core/net/drivers/ieee1275/ofnet.c
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--- grub-2.02~/grub-core/net/drivers/ieee1275/ofnet.c 2018-03-26 13:49:55.399558334 +0200
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+++ grub-2.02/grub-core/net/drivers/ieee1275/ofnet.c 2018-03-26 13:51:03.092656921 +0200
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@@ -232,7 +232,7 @@
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}
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grub_net_add_ipv4_local (inter,
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- __builtin_ctz (~grub_le_to_cpu32 (subnet_mask.ipv4)));
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+ __builtin_clz (~ (subnet_mask.ipv4)));
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}
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if (gateway_addr.ipv4 != 0)
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