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From 3d04aef8d80293d701f7efee6b5300f9f528ddfc Mon Sep 17 00:00:00 2001
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From: Maran Wilson <maran.wilson@oracle.com>
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Date: Tue, 7 Aug 2018 15:32:29 -0700
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Subject: [PATCH 15/62] Fix for "Section 0 has negative size" error when
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loading fbaa64.efi
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The current code is incorrectly failing to load the fbaa64.efi image found
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in Arm servers even though the UEFI shell code is able to properly load
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and execute the same image.
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The problem is due to the presence of a section header that has zero size
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and address and marked "discardable" in the fbaa64.efi image.
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Although there is already a check further down in the code to look for
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the discardable bit and skip further verification checks if set, we never
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get to that point due to the "end < base" check at the start of the loop.
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Here is a dump of the fbaa64.efi image as compiled on an Arm machine
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from the latest code in this repo:
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% # First I used hexedit to change header byte from 'AA' to '86'
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% # so that objdump was able to correctly parse the file:
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% objdump -x -m aarch64 fbaa64.efi
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fbaa64.efi: file format pei-x86-64
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fbaa64.efi
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architecture: i386:x86-64, flags 0x00000103:
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HAS_RELOC, EXEC_P, D_PAGED
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start address 0x0000000000000148
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Characteristics 0x20e
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executable
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line numbers stripped
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symbols stripped
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debugging information removed
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Time/Date Wed Dec 31 16:00:00 1969
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Magic 020b (PE32+)
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MajorLinkerVersion 2
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MinorLinkerVersion 20
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SizeOfCode 000b15d0
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SizeOfInitializedData 00000000
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SizeOfUninitializedData 00000000
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AddressOfEntryPoint 0000000000000148
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BaseOfCode 0000000000000148
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ImageBase 0000000000000000
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SectionAlignment 0000000000000020
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FileAlignment 0000000000000008
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MajorOSystemVersion 0
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MinorOSystemVersion 0
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MajorImageVersion 0
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MinorImageVersion 0
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MajorSubsystemVersion 0
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MinorSubsystemVersion 0
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Win32Version 00000000
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SizeOfImage 000b1718
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SizeOfHeaders 00000148
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CheckSum 00000000
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Subsystem 0000000a (EFI application)
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DllCharacteristics 00000000
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SizeOfStackReserve 0000000000000000
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SizeOfStackCommit 0000000000000000
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SizeOfHeapReserve 0000000000000000
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SizeOfHeapCommit 0000000000000000
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LoaderFlags 00000000
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NumberOfRvaAndSizes 00000006
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The Data Directory
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Entry 0 0000000000000000 00000000 Export Directory [.edata (or where ever we found it)]
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Entry 1 0000000000000000 00000000 Import Directory [parts of .idata]
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Entry 2 0000000000000000 00000000 Resource Directory [.rsrc]
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Entry 3 0000000000000000 00000000 Exception Directory [.pdata]
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Entry 4 0000000000000000 00000000 Security Directory
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Entry 5 0000000000000000 00000000 Base Relocation Directory [.reloc]
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Entry 6 0000000000000000 00000000 Debug Directory
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Entry 7 0000000000000000 00000000 Description Directory
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Entry 8 0000000000000000 00000000 Special Directory
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Entry 9 0000000000000000 00000000 Thread Storage Directory [.tls]
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Entry a 0000000000000000 00000000 Load Configuration Directory
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Entry b 0000000000000000 00000000 Bound Import Directory
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Entry c 0000000000000000 00000000 Import Address Table Directory
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Entry d 0000000000000000 00000000 Delay Import Directory
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Entry e 0000000000000000 00000000 CLR Runtime Header
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Entry f 0000000000000000 00000000 Reserved
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Sections:
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Idx Name Size VMA LMA File off Algn
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0 .reloc 00000000 0000000000000000 0000000000000000 00000000 2**0
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ALLOC, LOAD, READONLY, DATA
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1 .text 000b15d0 0000000000000148 0000000000000148 00000148 2**4
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CONTENTS, ALLOC, LOAD, CODE
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SYMBOL TABLE:
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no symbols
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Signed-off-by: Maran Wilson <maran.wilson@oracle.com>
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Reviewed-by: Aaron Young <aaron.young@oracle.com>
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Reviewed-by: Jack Schwartz <jack.schwartz@oracle.com>
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Upstream-commit-id: 6df7a8f5609
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---
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shim.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/shim.c b/shim.c
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index ae03da7eddf..d980cadacfc 100644
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--- a/shim.c
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+++ b/shim.c
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@@ -1347,6 +1347,11 @@ static EFI_STATUS handle_image (void *data, unsigned int datasize,
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*/
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Section = context.FirstSection;
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for (i = 0; i < context.NumberOfSections; i++, Section++) {
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+ /* Don't try to copy discardable sections with zero size */
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+ if ((Section->Characteristics & EFI_IMAGE_SCN_MEM_DISCARDABLE) &&
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+ !Section->Misc.VirtualSize)
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+ continue;
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+
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base = ImageAddress (buffer, context.ImageSize,
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Section->VirtualAddress);
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end = ImageAddress (buffer, context.ImageSize,
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--
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2.26.2
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