touch-packages team mailing list archive

[Paolo Pisati <1383410@xxxxxxxxxxxxxxxxxx>]

while we carry the 4.8.2 version, the proper fix was already cherry-
picked and applied, we'll revert Russel patch when it flows downstream.

Marking as invalid.

** Changed in: gcc-4.8 (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1383410

Title:
  gcc PR 58854 - 4.8.1 and 4.8.2 are known to miscompile the ARM kernel

Status in “gcc-4.8” package in Ubuntu:
  Invalid

Bug description:
  From https://lkml.org/lkml/2014/10/10/272:

  gcc versions 4.8.[012] and 4.9.0 generates code that prematurely adjusts the stack pointer such that still-to-be-referenced locals
  are below the stack pointer, which allows them to be overwritten by interrupts.

  rmk already has a patch in his for-next branch that blacklist this
  compiler:

  http://ftp.arm.linux.org.uk/cgit/linux-arm.git/commit/?h=for-
  next&id=7fc150543c73de71859631c8a6b17e3067fe7617

   and Trusty's toolchain is affected:

  [flag@stinkpad linux-2.6]$ make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnueabihf- 
    HOSTCC  scripts/basic/fixdep
    HOSTCC  scripts/kconfig/conf.o
    SHIPPED scripts/kconfig/zconf.tab.c
    SHIPPED scripts/kconfig/zconf.lex.c
    HOSTCC  scripts/kconfig/zconf.tab.o
    HOSTLD  scripts/kconfig/conf
  scripts/kconfig/conf --silentoldconfig Kconfig
    CHK     include/config/kernel.release
    CHK     include/generated/uapi/linux/version.h
    CHK     include/generated/utsrelease.h
  make[1]: `include/generated/mach-types.h' is up to date.
    CC      kernel/bounds.s
    GEN     include/generated/bounds.h
    CC      arch/arm/kernel/asm-offsets.s
  arch/arm/kernel/asm-offsets.c:53:2: error: #error Your compiler is too buggy; it is known to miscompile kernels
   #error Your compiler is too buggy; it is known to miscompile kernels
    ^
  arch/arm/kernel/asm-offsets.c:54:2: error: #error and result in filesystem corruption and oopses.
   #error and result in filesystem corruption and oopses.
    ^
  make[1]: *** [arch/arm/kernel/asm-offsets.s] Error 1
  make: *** [prepare0] Error 2
  [flag@stinkpad linux-2.6]$

  [flag@stinkpad linux-2.6]$ gcc -v
  Using built-in specs.
  COLLECT_GCC=gcc
  COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
  Target: x86_64-linux-gnu
  Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.2-19ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
  Thread model: posix
  gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) 
  [flag@stinkpad linux-2.6]$

  [flag@stinkpad linux-2.6]$ dpkg -l | grep linux-gnueabihf-
  ii  gcc-4.6-arm-linux-gnueabihf-base                      4.6.3-8ubuntu1cross1.67                             all          GCC, the GNU Compiler Collection (base package)
  ii  gcc-4.8-arm-linux-gnueabihf-base                      4.8.2-16ubuntu4cross0.11                            amd64        GCC, the GNU Compiler Collection (base package)

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