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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - CFI broken with dlsym()"
href="https://bugs.llvm.org/show_bug.cgi?id=44500">44500</a>
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<th>Summary</th>
<td>CFI broken with dlsym()
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>9.0
</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>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>henrik@gramner.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>CFI always considers indirect calls to function pointers returned by dlsym() to
have the wrong function signature, even though they're correct, resulting in
SIGILL.
Minimal code sample (compiled with -flto -fvisibility=hidden -fsanitize=cfi
-ldl):
#define _GNU_SOURCE
#include <dlfcn.h>
int main(int arc, char *argv[]) {
int (*p)(const char*) = dlsym(RTLD_DEFAULT, "puts");
if (p) p("hello!");
return 0;
}</pre>
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