Dear Maintainer,
just tried to reproduce this issue.
I suspected this is caused by some changes in the linux kernel,
as a up to date buster amd64 userland inside a qemu VM with following
kernel shows no problem:
Linux debian 4.16.0-2-amd64 #1 SMP Debian 4.16.12-1 (2018-05-27) x86_64
GNU/Linux
In following kernels this is visible:
Linux debian 4.17.0-1-amd64 #1 SMP Debian 4.17.8-1 (2018-07-20) x86_64
GNU/Linux
Linux debian 4.18.0-2-amd64 #1 SMP Debian 4.18.10-2 (2018-11-02) x86_64
GNU/Linux
Linux debian 4.19.0-rc7-amd64 #1 SMP Debian 4.19~rc7-1~exp1 (2018-10-07)
x86_64 GNU/Linux
benutzer@debian:~/e3/try2$ file /usr/bin/e3
/usr/bin/e3: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
statically linked, no section header
The file utility identifies the e3 binary as 32-bit static executable,
even in the amd64 package, probably related to it being written in assembler.
benutzer@debian:~$ objdump -x /usr/bin/e3
...
Program Header:
LOAD off 0x00000000 vaddr 0x08048000 paddr 0x08048000 align 2**0
filesz 0x00003387 memsz 0x00003387 flags r-x
LOAD off 0x00003387 vaddr 0x0804b387 paddr 0x0804b387 align 2**0
filesz 0x00000000 memsz 0x0010dcec flags rw-
It might be related to following discussion [1] and kernel patch [2].
Getting the second header entry aligned to 0x4000, what I tried to achive in
attached patch, seems to solve the issue in my test VM.
Kind regards,
Bernhard
[1]
https://stackoverflow.com/questions/51656713/cannot-load-custom-elf-executable-in-gdb
[2]
https://github.com/torvalds/linux/commit/a4ff8e8620d3f4f50ac4b41e8067b7d395056843
From 5bf403ebdf25d3a2e008a6c8542ceb4d8bc28703 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bernhard=20=C3=9Cbelacker?= <[email protected]>
Date: Tue, 6 Nov 2018 18:52:41 +0100
Subject: [PATCH] Align header to avoid crash.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=913014
---
e3.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/e3.h b/e3.h
index 1615be6..25d143d 100644
--- a/e3.h
+++ b/e3.h
@@ -861,6 +861,7 @@ phdr2: ;another Elf32_Phdr starts here
%else
org 0x8048000
ELFheader
+ times 0xC79 db 0
%endif
%else
;nothing
--
2.19.1
