[LLVMbugs] [Bug 5028] New: LLVM doesn't have -D_FORTIFY_SOURCE=x checks

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Sep 22 06:38:54 PDT 2009


           Summary: LLVM doesn't have -D_FORTIFY_SOURCE=x checks
           Product: new-bugs
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: new-feature
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: iamleeg at gmail.com
                CC: llvmbugs at cs.uiuc.edu

Summary: the compile-time and run-time safety tests enabled by use of the
_FORTIFY_SOURCE macro are not included when compiling with LLVM-clang or

Steps to reproduce: take the following source code, and compile with the
version of llvm-gcc or clang from /Developer/usr/bin in an Xcode 3.2
installation on Snow Leopard.

#include <stdio.h>
#include <string.h>

int main (int argc, const char * argv[]) {
        char buffer[16];
        strcpy(buffer, "hello");
        strcpy(buffer, "This sentence is much too long for you.");
        strcpy(buffer, argv[1]);
        return 0;

Expected results: a warning is emitted by the compiler as it would be if
compiled with GCC, due to the statically-testable buffer overrun at the second
strcpy() invocation. If the compiled program is run, it should abort inside the
libc overrun-check function.

Actual results: no warning is emitted. The program crashes when the stack is

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