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Gentoo GLSA 202409-22: Normal Severity GCC Code Generation Flaw

gentoo
Calendar Grey September 24, 2024
Dist Gentoo Esm H88
A GCC issue was found in Gentoo GLSA 202409-22 that may cause vulnerabilities in applications. Users should upgrade GCC immediately for security.
A vulnerability has been discovered in GCC, which can lead to flawed code generation.

Summary

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

Topics%20covered

Topics Covered

security advisory Gentoo security issue normal severity code generation GCC flawed code

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
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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.

Severity: Normal
Title: GCC: Flawed Code Generation
Date: September 24, 2024
Bugs: #719466
ID: 202409-22

Topics%20covered

Topics Covered

security advisory Gentoo security issue normal severity code generation GCC flawed code

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++,...).

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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.

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