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DescriptionVladimir Davydov
2012-10-29 07:36:24 UTC
Created attachment 634902[details]
This simple program fails on Ubuntu 12.04 with RHEL6.3 kernel if compiled on CentOS 5 i386 as -static
Description of problem:
Executing a shell script randomly fails if executed from a 32-bit program compiled as static on 64-bit systems with RHEL6.3 x86_64 kernel and newer glibc (2.15).
Version-Release number of selected component (if applicable):
2.6.32-279.11.1.el6.x86_64
How reproducible:
100%
Steps to Reproduce:
1. Compile fork_exec_bash.c (attached) as static on a 32 bit Linux (I used CentOS5 i386):
$ gcc fork_exec_bash.c -o fork_exec_bash -static
[binary is also attached]
2. Install Ubuntu 12.04 and an RHEL6.3 on it:
# alien -d kernel-2.6.32-279.11.1.el6.x86_64.rpm
# dpkg -i kernel_2.6.32-280.11_amd64.deb
# update-initramfs -c -k 2.6.32-279.11.1.el6.x86_64
# update-grub
3. Boot into the installed kernel and run the compiled program
Actual results:
/bin/bash
/bin/bash
bash: xmalloc: ../bash/shell.c:1596: cannot allocate 5 bytes (0 bytes allocated)
Parent exited
Expected results:
/bin/bash
/bin/bash
/bin/bash
/bin/bash
...
[forever]
Additional info:
The problem is connected with the way RHEL-based kernel look up for a exec vm areas. They do it using arch_get_unmapped_exec_area instead of traditional arch_get_unmapped_exec_area.
> Additional info:
> The problem is connected with the way RHEL-based kernel look up for a exec
> vm areas. They do it using arch_get_unmapped_exec_area instead of
> traditional arch_get_unmapped_exec_area.
mistype here: instead of arch_get_unmapped_area_topdown of course
A few things:
1. We don't support running the RHEL kernel on another OS.
2. We don't support custom built kernels.
3. We don't support running a custom built kernel running on another OS.
P.
Created attachment 634902 [details] This simple program fails on Ubuntu 12.04 with RHEL6.3 kernel if compiled on CentOS 5 i386 as -static Description of problem: Executing a shell script randomly fails if executed from a 32-bit program compiled as static on 64-bit systems with RHEL6.3 x86_64 kernel and newer glibc (2.15). Version-Release number of selected component (if applicable): 2.6.32-279.11.1.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1. Compile fork_exec_bash.c (attached) as static on a 32 bit Linux (I used CentOS5 i386): $ gcc fork_exec_bash.c -o fork_exec_bash -static [binary is also attached] 2. Install Ubuntu 12.04 and an RHEL6.3 on it: # alien -d kernel-2.6.32-279.11.1.el6.x86_64.rpm # dpkg -i kernel_2.6.32-280.11_amd64.deb # update-initramfs -c -k 2.6.32-279.11.1.el6.x86_64 # update-grub 3. Boot into the installed kernel and run the compiled program Actual results: /bin/bash /bin/bash bash: xmalloc: ../bash/shell.c:1596: cannot allocate 5 bytes (0 bytes allocated) Parent exited Expected results: /bin/bash /bin/bash /bin/bash /bin/bash ... [forever] Additional info: The problem is connected with the way RHEL-based kernel look up for a exec vm areas. They do it using arch_get_unmapped_exec_area instead of traditional arch_get_unmapped_exec_area.