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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AArch64] Some functions compiled without BTI with -fsanitize=cfi"
href="https://bugs.llvm.org/show_bug.cgi?id=46258">46258</a>
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<th>Summary</th>
<td>[AArch64] Some functions compiled without BTI with -fsanitize=cfi
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>peter@pcc.me.uk
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<th>Reporter</th>
<td>samitolvanen@google.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, keescook@chromium.org, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>When compiling a binary with both -mbranch-protection=bti and -fsanitize=cfi,
LLVM warns about functions being compiled without BTI:
$ echo "void a() {}" > test.c
$ clang -target aarch64-linux-gnu- -mbranch-protection=bti \
-flto=thin -fvisibility=default -fsanitize=cfi -fsanitize-cfi-cross-dso \
-c test.c
$ ld.lld -r -o test.lto.o test.o
warning: some functions compiled with BTI and some compiled without BTI
warning: not setting BTI in feature flags
Looking at the disassembly of test.o, it looks like the compiler generated
__cfi_check and __cfi_check_fail functions don't have the
"branch-target-enforcement" attribute.</pre>
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