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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - sanitizer dlopen interception clobbers RUNPATH"
href="https://llvm.org/bugs/show_bug.cgi?id=27790">27790</a>
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<th>Summary</th>
<td>sanitizer dlopen interception clobbers RUNPATH
</td>
</tr>
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<th>Product</th>
<td>compiler-rt
</td>
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<th>Version</th>
<td>3.8
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>compiler-rt
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>francisjricci@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>dlopen() uses the RUNPATH of the dso which calls it. This means that when a
shared sanitizer dso intercepts dlopen, the RUNPATH of the sanitizer dso will
be used instead of the RUNPATH of the dso being intercepted.
Repro steps:
clang-3.8 test.c -Wl,-rpath,'$ORIGIN' -Wl,--enable-new-dtags -ldl -o clean
clang-3.8 test.c -Wl,-rpath,'$ORIGIN' -Wl,--enable-new-dtags -ldl
-fsanitize=address -o sanitized_static
clang-3.8 test.c -Wl,-rpath,'$ORIGIN' -Wl,--enable-new-dtags -ldl
-fsanitize=address -shared-libasan -o sanitized_dynamic
clang-3.8 foo.c -shared -o foo.so
Note that executing clean and sanitized_static will succeed, while executing
sanitized_dynamic will fail.
foo.c:
int foo = 0;
test.c:
#include <dlfcn.h>
int main() {
if (dlopen("foo.so", RTLD_NOW)) {
return 0;
}
return 1;
}</pre>
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