A vulnerability has been discovered in GCC, which can lead to flawed code generation.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| sys-devel/gcc | ppc ppc64 | < 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