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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang fails to warn about NSPredicate format string mistakes"
href="http://llvm.org/bugs/show_bug.cgi?id=19200">19200</a>
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<th>Summary</th>
<td>clang fails to warn about NSPredicate format string mistakes
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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>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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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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<th>Reporter</th>
<td>sean@rogue-research.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Mistakes with format strings are a well-known security issue, and compilers
warn in many cases.
clang fails to warn here however:
-----------------------
#import <Foundation/Foundation.h>
int main (void)
{
NSPredicate* predicate = [NSPredicate predicateWithFormat:@"foo == %d"];
return !!predicate;
}
-----------------------
$ clang --version
clang version 3.5.0 (204240)
Target: x86_64-apple-darwin12.5.0
Thread model: posix
$ clang -Weverything -fsyntax-only ~/test.m
<no warnings given>
According to Greg Parker, "The problem is that +predicateWithFormat: accepts
conversions that are not part of NSString's format string syntax. Adding format
string warnings for new format string syntaxes requires compiler changes."
See also <rdar://10699748>.</pre>
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