Gentoo: GLSA-202409-22: GCC: Flawed Code GenerationSecurity Advisory Updates
Summary
A vulnerability has been discovered in GCC. Please review the CVE
identifier referenced below for details.
Resolution
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
References
[ 1 ] CVE-2019-15847
https://nvd.nist.gov/vuln/detail/CVE-2019-15847
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/202409-22
Concerns
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.
Synopsis
A vulnerability has been discovered in GCC, which can lead to flawed
code generation.
Background
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++,...).
Affected Packages
Package Vulnerable Unaffected
------------- ------------ ------------
sys-devel/gcc < 10.0 >= 10.0
Impact
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.
Workaround
There is no known workaround at this time.
