[Bug 1972043] Re: Please add -ftrivial-auto-var-init=zero to default build flags

[Kees Cook]

Adding it to the compiler means *all* builds benefit, which is the
reason this was done on the other options. People build their local
projects, newer versions of tools from GitHub, etc etc.

This needs to be in the compiler directly.

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Title:
  Please add -ftrivial-auto-var-init=zero to default build flags

Status in dpkg package in Ubuntu:
  New
Status in gcc-12 package in Ubuntu:
  New
Status in dpkg source package in Kinetic:
  New
Status in gcc-12 source package in Kinetic:
  New

Bug description:
  Please add "-ftrivial-auto-var-init=zero" for GCC 12 (which is the
  first release of GCC to provide this flag).

  It goes well with the other important security flaw mitigation flags already enabled in Ubuntu for GCC:
  https://wiki.ubuntu.com/ToolChain/CompilerFlags

  While many variables are initialized (due to -Wuninitialized), there
  is a blind spot for variables passed by reference, padding, and cases
  where -Wuninitialized just fails to track it. Universally wiping the
  variables eliminates nearly the entire class of uninitialized stack
  variable use (https://cwe.mitre.org/data/definitions/457.html) with
  nearly no overhead (e.g. any duplicate assignments will already be
  squashed during dead store elimination, etc).

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