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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - ARMLoadStoreOptimizer should be disable when Address Sanitizer is enable"
href="http://llvm.org/bugs/show_bug.cgi?id=18865">18865</a>
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<th>Summary</th>
<td>ARMLoadStoreOptimizer should be disable when Address Sanitizer is enable
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>
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<th>Component</th>
<td>Backend: ARM
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>manjian2006@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12076" name="attach_12076" title="source that cause bug">attachment 12076</a> <a href="attachment.cgi?id=12076&action=edit" title="source that cause bug">[details]</a></span>
source that cause bug
test code is in the uploaded attachment.
clang -Os -target arm-linux-androideabi -march=armv7-a -fsanitize=address
-mthumb -S /tmp/1.cpp
illegal code generated:
=> lsrs r6, r4, #3
ldr r1, [r1, r0]
add r0, r2
str r0, [r4, #4]
str r1, [r4, #8]
movw r1, #62208
movw r0, #61937
movt r1, #62451
add.w r5, r4, #16
=> stm.w r6, {r0, r1}
r4 stores the results of __asan_stack_malloc_1,r6 is the shadow memory address
of r4.Since r4 is a stack address,which is aligned to 64 bits when the target
is ARM, the right swift will result in a address not aligned to 32 bits.So
stm.w will result in alignment fault (A3.2.1).
The code is from FunctionStackPoisoner::poisonRedZones in
lib/Transforms/Instrumentation/AddressSanitizer.cpp.</pre>
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