2023-08-24 05:25:56 +02:00
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--- a/grub-core/loader/i386/efi/linux.c
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+++ b/grub-core/loader/i386/efi/linux.c
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@@ -298,7 +298,14 @@
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2017-03-06 08:17:24 +01:00
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lh.code32_start = (grub_uint32_t)(grub_addr_t) kernel_mem;
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}
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- grub_memcpy(params, &lh, 2 * 512);
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+ /* Grub linuxefi erroneously initialize linux's boot_params with non-zero values. (bsc#1025563)
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+
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+ From https://www.kernel.org/doc/Documentation/x86/boot.txt:
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+ The memory for struct boot_params could be allocated anywhere (even above 4G)
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+ and initialized to all zero.
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+ Then, the setup header at offset 0x01f1 of kernel image on should be
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+ loaded into struct boot_params and examined. */
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+ grub_memcpy (¶ms->setup_sects, &lh.setup_sects, sizeof (lh) - 0x01f1);
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params->type_of_loader = 0x21;
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