[Qemu-devel] [Bug 1531352] Re: QEMU_LD_PREFIX not load correct library order in the PATH

[bananaapple]

** Description changed:

  run qemu with QEMU_LD_PREFIX argument will not load correct library order in 
the PATH.
  How to reproduce this bug:
  These command will download the library of other architectures
  wget 
https://raw.githubusercontent.com/BinaryAnalysisPlatform/qira/master/fetchlibs.sh
  ./fetchlibs.sh
  This is 32bit binary file,
  wget http://train.cs.nctu.edu.tw/files/magic
  chmod +x ./magic
  qemu-i386 -L /home/apple/libs/i386 /home/apple/magic
  This is work fine.
  But after you install gcc-multilib, it failed.
  sudo apt-get install gcc-multilib
  qemu-i386 -L /home/apple/libs/i386 /home/apple/magic
  The following is the error message
  /home/apple/magic: 0���: ̀Í�: D$(�$: Error 18446744073549536926
  Because the order of dynamic linker search the shared library is wrong.
  When your system has /lib32 directory, its priority is higher than the 
QEMU_LD_PREFIX.
  If the system not loaded correspond with the dynamic linker, it will crash.
  Code flow:
- linux-user/main.c: 
-   call loader_exec
- linuxload.c: 
-   call load_elf_binary
- elfload.c: 
-   in load_elf_binary function
-   dynamic loader will be elf_interpreter
+ linux-user/main.c:
+   call loader_exec
+ linuxload.c:
+   call load_elf_binary
+ elfload.c:
+   in load_elf_binary function
+   dynamic loader will be elf_interpreter
  I think the problem should be here.

** Also affects: gcc-defaults (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: gcc-defaults (Ubuntu)

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https://bugs.launchpad.net/bugs/1531352

Title:
  QEMU_LD_PREFIX not load correct library order in the PATH

Status in QEMU:
  New

Bug description:
  run qemu with QEMU_LD_PREFIX argument will not load correct library order in 
the PATH.
  How to reproduce this bug:
  These command will download the library of other architectures
  wget 
https://raw.githubusercontent.com/BinaryAnalysisPlatform/qira/master/fetchlibs.sh
  ./fetchlibs.sh
  This is 32bit binary file,
  wget http://train.cs.nctu.edu.tw/files/magic
  chmod +x ./magic
  qemu-i386 -L /home/apple/libs/i386 /home/apple/magic
  This is work fine.
  But after you install gcc-multilib, it failed.
  sudo apt-get install gcc-multilib
  qemu-i386 -L /home/apple/libs/i386 /home/apple/magic
  The following is the error message
  /home/apple/magic: 0���: ̀Í�: D$(�$: Error 18446744073549536926
  Because the order of dynamic linker search the shared library is wrong.
  When your system has /lib32 directory, its priority is higher than the 
QEMU_LD_PREFIX.
  If the system not loaded correspond with the dynamic linker, it will crash.
  Code flow:
  linux-user/main.c:
    call loader_exec
  linuxload.c:
    call load_elf_binary
  elfload.c:
    in load_elf_binary function
    dynamic loader will be elf_interpreter
  I think the problem should be here.

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