linux-kernel - [PATCH] x86: boot: Fix EFI stub alignment

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Date:   Sun, 16 Sep 2018 16:22:47 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org
Subject: [PATCH] x86: boot: Fix EFI stub alignment

We currently align the end of the compressed image to a multiple of
16.  However the PE-COFF header included in the EFI stub says that the
file alignment is 32 bytes, and when adding an EFI signature to the
file it must first be padded to this alignment.

sbsigntool commands warn about this:

    warning: file-aligned section .text extends beyond end of file
    warning: checksum areas are greater than image size. Invalid section table?

Worse, pesign-at least when creating a detached signature—uses the
hash of the unpadded file, resulting in an invalid signature if
padding is required.

Avoid both these problems by increasing alignment to 32 bytes when
CONFIG_EFI_STUB is enabled.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/x86/boot/tools/build.c
+++ b/arch/x86/boot/tools/build.c
@@ -391,6 +391,13 @@ int main(int argc, char ** argv)
 		die("Unable to mmap '%s': %m", argv[2]);
 	/* Number of 16-byte paragraphs, including space for a 4-byte CRC */
 	sys_size = (sz + 15 + 4) / 16;
+#ifdef CONFIG_EFI_STUB
+	/*
+	 * COFF requires minimum 32-byte alignment of sections, and
+	 * adding a signature is problematic without that alignment.
+	 */
+	sys_size = (sys_size + 1) & ~1;
+#endif

 	/* Patch the setup code with the appropriate size parameters */
 	buf[0x1f1] = setup_sectors-1;

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