Re: [PATCH v2 5/7] arm: efi: split zImage code and data into separate... | linux-efi

Re: [PATCH v2 5/7] arm: efi: split zImage code and data into separate PE/COFF sections

From: Gregory CLEMENT <hidden>
Date: 2017-09-08 13:50:42
Also in: linux-arm-kernel

Possibly related (same subject, not in this thread)

2017-09-08 · [PATCH v2 5/7] arm: efi: split zImage code and data into separate PE/COFF sections · Ard Biesheuvel <hidden>
2017-09-08 · [PATCH v2 5/7] arm: efi: split zImage code and data into separate PE/COFF sections · Gregory CLEMENT <hidden>
2017-09-08 · [PATCH v2 5/7] arm: efi: split zImage code and data into separate PE/COFF sections · Ard Biesheuvel <hidden>
2017-09-08 · [PATCH v2 5/7] arm: efi: split zImage code and data into separate PE/COFF sections · Ard Biesheuvel <hidden>
2017-09-08 · [PATCH v2 5/7] arm: efi: split zImage code and data into separate PE/COFF sections · Gregory CLEMENT <hidden>

Hi Ard,
 
 On jeu., juin 29 2017, Ard Biesheuvel [off-list ref] wrote:

To prevent unintended modifications to the kernel text (malicious or
otherwise) while running the EFI stub, describe the kernel image as
two separate sections: a .text section with read-execute permissions,
covering .text, .rodata, .piggytext and the GOT sections (which the
stub does not care about anyway), and a .data section with read-write
permissions, covering .data and .bss.

This relies on the firmware to actually take the section permission
flags into account, but this is something that is currently being
implemented in EDK2, which means we will likely start seeing it in
the wild between one and two years from now.

This patch had been merged in mainline yesterday and now prevent the
Marvell Armada 370 and the Armada XP based SoC to boot. I also suspect
that more Socs are impacted because the number of boot fail exploded
according to kci:
https://kernelci.org/boot/all/job/mainline/branch/master/kernel/v4.13-8899-g8dc5b3a6cb2f/

I found this patch after bisecting (I can provide the bisect log if
needed).

The kernel failed to boot only if CONFIG_EFI is enabled so it occurs in
multi_v7_defconfig but not with mvebu_v7_defconfig.

Currently the solution is to revert this patch.

Have you a better option?

Thanks,

Gregory

quoted hunk

Cc: Russell King <redacted>
Signed-off-by: Ard Biesheuvel <redacted>
---
 arch/arm/boot/compressed/efi-header.S  | 32 ++++++++++++++------
 arch/arm/boot/compressed/vmlinux.lds.S | 30 +++++++++++++-----
 2 files changed, 46 insertions(+), 16 deletions(-)

diff --git a/arch/arm/boot/compressed/efi-header.S b/arch/arm/boot/compressed/efi-header.S
index 542e1ad432ae..c94a88ae834d 100644
--- a/arch/arm/boot/compressed/efi-header.S
+++ b/arch/arm/boot/compressed/efi-header.S

@@ -54,20 +54,22 @@ coff_header:
 			IMAGE_FILE_EXECUTABLE_IMAGE | \
 			IMAGE_FILE_LINE_NUMS_STRIPPED	@ Characteristics
 
+#define __pecoff_code_size (__pecoff_data_start - __efi_start)
+
 optional_header:
 		.short	PE_OPT_MAGIC_PE32		@ PE32 format
 		.byte	0x02				@ MajorLinkerVersion
 		.byte	0x14				@ MinorLinkerVersion
-		.long	_end - __efi_start		@ SizeOfCode
-		.long	0				@ SizeOfInitializedData
+		.long	__pecoff_code_size		@ SizeOfCode
+		.long	__pecoff_data_size		@ SizeOfInitializedData
 		.long	0				@ SizeOfUninitializedData
 		.long	efi_stub_entry - start		@ AddressOfEntryPoint
 		.long	start_offset			@ BaseOfCode
-		.long	0				@ BaseOfData
+		.long	__pecoff_data_start - start	@ BaseOfData
 
 extra_header_fields:
 		.long	0				@ ImageBase
-		.long	SZ_512				@ SectionAlignment
+		.long	SZ_4K				@ SectionAlignment
 		.long	SZ_512				@ FileAlignment
 		.short	0				@ MajorOsVersion
 		.short	0				@ MinorOsVersion

@@ -77,7 +79,7 @@ extra_header_fields:
 		.short	0				@ MinorSubsystemVersion
 		.long	0				@ Win32VersionValue
 
-		.long	_end - start			@ SizeOfImage
+		.long	__pecoff_end - start		@ SizeOfImage
 		.long	start_offset			@ SizeOfHeaders
 		.long	0				@ CheckSum
 		.short	IMAGE_SUBSYSTEM_EFI_APPLICATION	@ Subsystem

@@ -98,9 +100,9 @@ extra_header_fields:
 
 section_table:
 		.ascii	".text\0\0\0"
-		.long	_end - __efi_start		@ VirtualSize
+		.long	__pecoff_code_size		@ VirtualSize
 		.long	__efi_start			@ VirtualAddress
-		.long	_edata - __efi_start		@ SizeOfRawData
+		.long	__pecoff_code_size		@ SizeOfRawData
 		.long	__efi_start			@ PointerToRawData
 		.long	0				@ PointerToRelocations
 		.long	0				@ PointerToLineNumbers

@@ -108,12 +110,24 @@ section_table:
 		.short	0				@ NumberOfLineNumbers
 		.long	IMAGE_SCN_CNT_CODE | \
 			IMAGE_SCN_MEM_READ | \
-			IMAGE_SCN_MEM_WRITE | \
 			IMAGE_SCN_MEM_EXECUTE		@ Characteristics
 
+		.ascii	".data\0\0\0"
+		.long	__pecoff_data_size		@ VirtualSize
+		.long	__pecoff_data_start - start	@ VirtualAddress
+		.long	__pecoff_data_rawsize		@ SizeOfRawData
+		.long	__pecoff_data_start - start	@ PointerToRawData
+		.long	0				@ PointerToRelocations
+		.long	0				@ PointerToLineNumbers
+		.short	0				@ NumberOfRelocations
+		.short	0				@ NumberOfLineNumbers
+		.long	IMAGE_SCN_CNT_INITIALIZED_DATA | \
+			IMAGE_SCN_MEM_READ | \
+			IMAGE_SCN_MEM_WRITE		@ Characteristics
+
 		.set	section_count, (. - section_table) / 40
 
-		.align	9
+		.align	12
 __efi_start:
 #endif
 		.endm

diff --git a/arch/arm/boot/compressed/vmlinux.lds.S b/arch/arm/boot/compressed/vmlinux.lds.S
index 1fa62432e283..dfcc2baa0077 100644
--- a/arch/arm/boot/compressed/vmlinux.lds.S
+++ b/arch/arm/boot/compressed/vmlinux.lds.S

@@ -53,13 +53,6 @@ SECTIONS
     *(.rodata)
     *(.rodata.*)
   }
-  .data : {
-    /*
-     * The EFI stub always executes from RAM, and runs strictly before the
-     * decompressor, so we can make an exception for its r/w data, and keep it
-     */
-    *(.data.efistub)
-  }
   .piggydata : {
     *(.piggydata)
   }

@@ -75,6 +68,26 @@ SECTIONS
   /* ensure the zImage file size is always a multiple of 64 bits */
   /* (without a dummy byte, ld just ignores the empty section) */
   .pad			: { BYTE(0); . = ALIGN(8); }
+
+#ifdef CONFIG_EFI_STUB
+  .data : ALIGN(4096) {
+    __pecoff_data_start = .;
+    /*
+     * The EFI stub always executes from RAM, and runs strictly before the
+     * decompressor, so we can make an exception for its r/w data, and keep it
+     */
+    *(.data.efistub)
+    __pecoff_data_end = .;
+
+    /*
+     * PE/COFF mandates a file size which is a multiple of 512 bytes if the
+     * section size equals or exceeds 4 KB
+     */
+    . = ALIGN(512);
+  }
+  __pecoff_data_rawsize = . - ADDR(.data);
+#endif
+
   _edata = .;
 
   _magic_sig = ZIMAGE_MAGIC(0x016f2818);

@@ -89,6 +102,9 @@ SECTIONS
   . = ALIGN(8);		/* the stack must be 64-bit aligned */
   .stack		: { *(.stack) }
 
+  PROVIDE(__pecoff_data_size = ALIGN(512) - ADDR(.data));
+  PROVIDE(__pecoff_end = ALIGN(512));
+
   .stab 0		: { *(.stab) }
   .stabstr 0		: { *(.stabstr) }
   .stab.excl 0		: { *(.stab.excl) }

-- 
2.9.3


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-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

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