glsa-202409-22.xml


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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202409-22">
    <title>GCC: Flawed Code Generation</title>
    <synopsis>A vulnerability has been discovered in GCC, which can lead to flawed code generation.</synopsis>
    <product type="ebuild">gcc</product>
    <announced>2024-09-24</announced>
    <revised count="1">2024-09-24</revised>
    <bug>719466</bug>
    <access>remote</access>
    <affected>
        <package name="sys-devel/gcc" auto="yes" arch="ppc  ppc64">
            <unaffected range="ge">10.0</unaffected>
            <vulnerable range="lt">10.0</vulnerable>
        </package>
    </affected>
    <background>
        <p>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++,...).</p>
    </background>
    <description>
        <p>A vulnerability has been discovered in GCC. Please review the CVE identifier referenced below for details.</p>
    </description>
    <impact type="normal">
        <p>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.</p>
    </impact>
    <workaround>
        <p>There is no known workaround at this time.</p>
    </workaround>
    <resolution>
        <p>All GCC users should upgrade to the latest version:</p>
        
        <code>
          # emerge --sync
          # emerge --ask --oneshot --verbose ">=sys-devel/gcc-10.0"
        </code>
        
        <p>And then select it with gcc-config:</p>
        
        <code>
          # gcc-config latest
        </code>
        
        <p>In this case, users should also rebuild all affected packages with emerge -e, e.g.:</p>
        
        <code>
          # emerge --usepkg=n --emptytree @world
        </code>
    </resolution>
    <references>
        <uri link="https://nvd.nist.gov/vuln/detail/CVE-2019-15847">CVE-2019-15847</uri>
    </references>
    <metadata tag="requester" timestamp="2024-09-24T05:11:59.047098Z">graaff</metadata>
    <metadata tag="submitter" timestamp="2024-09-24T05:11:59.050051Z">graaff</metadata>
</glsa>