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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - compiler-rt: files contain writable and executable sections"
href="https://bugs.llvm.org/show_bug.cgi?id=35739">35739</a>
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<th>Summary</th>
<td>compiler-rt: files contain writable and executable sections
</td>
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<th>Product</th>
<td>compiler-rt
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>compiler-rt
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>willwiemann@fake-box.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>My Linux system detected some writeable and executable sections in the files
usr/lib/clang/5.0.1/lib/linux/libclang_rt.builtins-x86_64.a:chkstk.S.o
usr/lib/clang/5.0.1/lib/linux/libclang_rt.builtins-x86_64.a:chkstk2.S.o
usr/lib/clang/5.0.1/lib/linux/libclang_rt.builtins-i386.a:chkstk.S.o
usr/lib/clang/5.0.1/lib/linux/libclang_rt.builtins-i386.a:chkstk2.S.o
I do not understand entirely why this is the case. However, I'm not alone with
this (see related issues by other projects).
This is what I've found out so far.
The commit [1] fixed part of this but did not cover {i386,x86_64}/chkstk.S,
{i386,x86_64}/chkstk2.S. The reason might be that NO_EXEC_STACK_DIRECTIVE is a
NO-OP on Windows and according to the comments in the files chkstk.S and
chkstk2.S are windows only. This impression is supported by
lib/builtin/CMakeFiles.txt which explicitly includes these files as additional
x86_64_SOURCES (line 247).
However, these files are already included in x86_64_SOURCES (same for
i386_SOURCES). This was done by commit [2]. Looking at this commit more
closely, it adds chkstk.S and chkstk2.S unconditionally even though they were
conditionally included. My guess is that these files were added accidentally by
[2] and should only be compiled on Windows.
[1]
git-sha: 4c71a477ac0bd7b19c72d7625861f1f18c15b278
git-svn-id: <a href="https://llvm.org/svn/llvm-project/compiler-rt/trunk@273500">https://llvm.org/svn/llvm-project/compiler-rt/trunk@273500</a>
91177308-0d34-0410-b5e6-96231b3b80d8
[2]
git-sha: a405fc16c3227898f22422a045ee2e36bc605776
git-svn-id: <a href="https://llvm.org/svn/llvm-project/compiler-rt/trunk@252927">https://llvm.org/svn/llvm-project/compiler-rt/trunk@252927</a>
91177308-0d34-0410-b5e6-96231b3b80d8
Related issues by other projects:
rust: <a href="https://github.com/rust-lang-nursery/compiler-builtins/issues/183">https://github.com/rust-lang-nursery/compiler-builtins/issues/183</a>
gentoo: <a href="https://bugs.gentoo.org/show_bug.cgi?id=641026">https://bugs.gentoo.org/show_bug.cgi?id=641026</a></pre>
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