Your message dated Sun, 27 Sep 2015 13:43:14 +0200 with message-id <[email protected]> and subject line Re: Bug#800146: Can't load x32 binaries on amd64 system has caused the Debian Bug report #800146, regarding Can't load x32 binaries on amd64 system to be marked as done.
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--- Begin Message ---Package: linux-image-3.16.0-4-amd64 Version: 3.16.7-ckt11-1+deb8u3 Severity: normal Dear Maintainer, I am able to run i386 and i686 binaries on my amd64 system, but not x32. Steps to reproduce: # apt-get install libc6-dev-x32 ... $ gcc -Os -mx32 -o /tmp/csv2tsv /usr/local/src/csv2tsv.c $ ldd /tmp/csv2tsv not a dynamic executable $ /tmp/csv2tsv bash: /tmp/csv2tsv: cannot execute binary file: Exec format error $ /libx32/ld-2.19.so bash: /libx32/ld-2.19.so: cannot execute binary file: Exec format error I expected that I would be able to run x32 binaries with libc6-dev-x32 and libc6-x32 installed on an amd64 system, but as the loader won't load this it is not going to work. It looks like the kernel config prevents x32 binaries from loading. This limitation breaks libc6-dev-x32 and libc6-x32 packages. However, I can still run generic Pentium4 "-m32 -march=pentium4 -mtune=generic -msse3 -mfpmath=sse" builds on amd64. Is this related to CVE-2014-0038 ? /boot/config-3.16.0-4-amd64 # # Executable file formats / Emulations # CONFIG_BINFMT_ELF=y CONFIG_COMPAT_BINFMT_ELF=y CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE=y CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y CONFIG_BINFMT_SCRIPT=y # CONFIG_HAVE_AOUT is not set CONFIG_BINFMT_MISC=m CONFIG_COREDUMP=y CONFIG_IA32_EMULATION=y CONFIG_IA32_AOUT=y CONFIG_X86_X32=y CONFIG_X86_X32_DISABLED=y CONFIG_COMPAT=y CONFIG_COMPAT_FOR_U64_ALIGNMENT=y CONFIG_SYSVIPC_COMPAT=y CONFIG_KEYS_COMPAT=y CONFIG_X86_DEV_DMA_OPS=y CONFIG_IOSF_MBI=m CONFIG_NET=y CONFIG_COMPAT_NETLINK_MESSAGES=y
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--- Begin Message ---Hi Andrew, On Sun, Sep 27, 2015 at 06:40:30PM +0800, Andrew Buckeridge - Private wrote: > Package: linux-image-3.16.0-4-amd64 > Version: 3.16.7-ckt11-1+deb8u3 > Severity: normal > > Dear Maintainer, > I am able to run i386 and i686 binaries on my amd64 system, but not x32. > > > Steps to reproduce: > > # apt-get install libc6-dev-x32 > ... > > $ gcc -Os -mx32 -o /tmp/csv2tsv /usr/local/src/csv2tsv.c > $ ldd /tmp/csv2tsv > not a dynamic executable > $ /tmp/csv2tsv > bash: /tmp/csv2tsv: cannot execute binary file: Exec format error > > $ /libx32/ld-2.19.so > bash: /libx32/ld-2.19.so: cannot execute binary file: Exec format error > > > I expected that I would be able to run x32 binaries with libc6-dev-x32 > and libc6-x32 installed on an amd64 system, but as the loader won't load > this it is not going to work. > > It looks like the kernel config prevents x32 binaries from loading. X32 support support is indeed present starting from 3.14.15-1, but you need to explicitly enable it with syscall.x32=y on the command line, see https://wiki.debian.org/X32Port#Getting_Started . See https://bugs.debian.org/708070 for more details on the reasoning. Regards, Salvatore
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