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Security Things in Linux 4.18 and Embrace of Newer GCC

Submitted by Roy Schestowitz on Tuesday 21st of August 2018 01:53:18 PM Filed under
Development
GNU
Linux
Security
  • security things in Linux v4.18

    One of the many ways C can be dangerous to use is that it lacks strong primitives to deal with arithmetic overflow. A developer can’t just wrap a series of calculations in a try/catch block to trap any calculations that might overflow (or underflow). Instead, C will happily wrap values back around, causing all kinds of flaws. Some time ago GCC added a set of single-operation helpers that will efficiently detect overflow, so Rasmus Villemoes suggested implementing these (with fallbacks) in the kernel. While it still requires explicit use by developers, it’s much more fool-proof than doing open-coded type-sensitive bounds checking before every calculation. As a first-use of these routines, Matthew Wilcox created wrappers for common size calculations, mainly for use during memory allocations.

  • Linux 4.19 Raises The GCC Minimum Version Required To Build The Kernel

    Officially the Linux kernel listed GCC 3.2 as the minimum version of the GNU compiler needed. However, with Linux 4.19 that is being raised to GCC 4.6.

    Various architectures on older GCC4 releases had already been failing to cleanly compile the Linux kernel so with Linux 4.19 that minimum version supported is being set at GCC 4.6.

  • Linux 4.19 Kernel Now Requires GCC 4.6 to Build, Due to Compiling Failures on Older Architecture

    For Linux developers working on the kernel, the to-be-released Linux 4.19 kernel raises the GCC minimum version required for kernel building. The official Linux kernel has listed GCC 3.2 as the minimum version of the compiler required for kernel building, but Linux kernel 4.19 is raising that to GCC 4.6.

    This is because various architectures on older GCC4 releases have been failing to cleanly compile the Linux kernel, hence why GCC 4.6 is being set as the minimum. The kernel will also explicitly check for GCC 4.6.0 or newer and if not found, the compiler will error out.

    This is also beneficial for the kernel code, as the kernel devs were able to strip out several dozen lines of code for older GCC workarounds that were aimed at compiler bugs and behavioral differences in the older compiler releases.

»

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