[PATCH 5.10 057/118] s390/boot: add secure boot trailer

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From: Peter Oberparleiter <oberpar@xxxxxxxxxxxxx>

[ Upstream commit aa127a069ef312aca02b730d5137e1778d0c3ba7 ]

This patch enhances the kernel image adding a trailer as required for
secure boot by future firmware versions.

Cc: <stable@xxxxxxxxxxxxxxx> # 5.2+
Signed-off-by: Peter Oberparleiter <oberpar@xxxxxxxxxxxxx>
Reviewed-by: Sven Schnelle <svens@xxxxxxxxxxxxx>
Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 arch/s390/boot/compressed/vmlinux.lds.S | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/s390/boot/compressed/vmlinux.lds.S b/arch/s390/boot/compressed/vmlinux.lds.S
index 9427e2cd0c15..11bf3919610e 100644
--- a/arch/s390/boot/compressed/vmlinux.lds.S
+++ b/arch/s390/boot/compressed/vmlinux.lds.S
@@ -91,8 +91,17 @@ SECTIONS
 		_compressed_start = .;
 		*(.vmlinux.bin.compressed)
 		_compressed_end = .;
-		FILL(0xff);
-		. = ALIGN(4096);
+	}
+
+#define SB_TRAILER_SIZE 32
+	/* Trailer needed for Secure Boot */
+	. += SB_TRAILER_SIZE; /* make sure .sb.trailer does not overwrite the previous section */
+	. = ALIGN(4096) - SB_TRAILER_SIZE;
+	.sb.trailer : {
+		QUAD(0)
+		QUAD(0)
+		QUAD(0)
+		QUAD(0x000000207a49504c)
 	}
 	_end = .;
 
-- 
2.35.1






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