GCC: Flawed Code Generation

GCC: Flawed Code Generation A vulnerability has been discovered in GCC, which can lead to flawed code generation. gcc 2024-09-24 2024-09-24 719466 remote 10.0 10.0

The GNU Compiler Collection includes front ends for C, C++, Objective-C, Fortran, Ada, Go, D and Modula-2 as well as libraries for these languages (libstdc++,...).

A vulnerability has been discovered in GCC. Please review the CVE identifier referenced below for details.

The POWER9 backend in GNU Compiler Collection (GCC) could optimize multiple calls of the __builtin_darn intrinsic into a single call, thus reducing the entropy of the random number generator. This occurred because a volatile operation was not specified. For example, within a single execution of a program, the output of every __builtin_darn() call may be the same.

There is no known workaround at this time.

All GCC users should upgrade to the latest version:


          # emerge --sync
          # emerge --ask --oneshot --verbose ">=sys-devel/gcc-10.0"

And then select it with gcc-config:


          # gcc-config latest

In this case, users should also rebuild all affected packages with emerge -e, e.g.:


          # emerge --usepkg=n --emptytree @world

CVE-2019-15847 graaff graaff