53 lines
		
	
	
		
			2.0 KiB
		
	
	
	
		
			Diff
		
	
	
	
	
	
			
		
		
	
	
			53 lines
		
	
	
		
			2.0 KiB
		
	
	
	
		
			Diff
		
	
	
	
	
	
From 9817ec81968a5eec7863902833fb77680544eae4 Mon Sep 17 00:00:00 2001
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From: Alexander Egorenkov <egorenar-dev@posteo.net>
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Date: Mon, 12 Apr 2021 13:18:05 +0200
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Subject: [PATCH 1/1] arm: do not copy magic 4 bytes of appended DTB in zImage
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If the passed zImage happens to have a DTB appended, then the magic 4 bytes
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of the DTB are copied together with the kernel image. This leads to
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failed kexec boots because the decompressor finds the aforementioned
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DTB magic and falsely tries to replace the DTB passed in the register r2
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with the non-existent appended one.
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Signed-off-by: Alexander Egorenkov <egorenar-dev@posteo.net>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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---
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 kexec/arch/arm/kexec-zImage-arm.c | 12 +++++++++++-
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 1 file changed, 11 insertions(+), 1 deletion(-)
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--- a/kexec/arch/arm/kexec-zImage-arm.c
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+++ b/kexec/arch/arm/kexec-zImage-arm.c
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@@ -382,6 +382,7 @@ int zImage_arm_load(int argc, char **arg
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 	unsigned int atag_offset = 0x1000; /* 4k offset from memory start */
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 	unsigned int extra_size = 0x8000; /* TEXT_OFFSET */
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 	const struct zimage_tag *tag;
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+	size_t kernel_buf_size;
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 	size_t kernel_mem_size;
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 	const char *command_line;
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 	char *modified_cmdline = NULL;
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@@ -538,6 +539,15 @@ int zImage_arm_load(int argc, char **arg
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 	}
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 	/*
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+	 * Save the length of the compressed kernel image w/o the appended DTB.
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+	 * This will be required later on when the kernel image contained
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+	 * in the zImage will be loaded into a kernel memory segment.
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+	 * And we want to load ONLY the compressed kernel image from the zImage
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+	 * and discard the appended DTB.
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+	 */
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+	kernel_buf_size = len;
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+
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+	/*
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 	 * Always extend the zImage by four bytes to ensure that an appended
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 	 * DTB image always sees an initialised value after _edata.
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 	 */
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@@ -759,7 +769,7 @@ int zImage_arm_load(int argc, char **arg
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 		add_segment(info, dtb_buf, dtb_length, dtb_offset, dtb_length);
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 	}
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-	add_segment(info, buf, len, kernel_base, kernel_mem_size);
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+	add_segment(info, buf, kernel_buf_size, kernel_base, kernel_mem_size);
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 	info->entry = (void*)kernel_base;
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