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Re: [Tinycc-devel] [TIPS] empty test program will crash if compiled with


From: Sergey Korshunoff
Subject: Re: [Tinycc-devel] [TIPS] empty test program will crash if compiled with -b option
Date: Wed, 25 Mar 2015 18:48:39 +0300

Hi! There is no __bound_init() function if program don't have any
bounds to check. There is a test program and tcc patch. Test program
can't be compiled if -b option is used.

int main ()
{
#if 0
    // tcc: error: __bound_init not defined
    // include v variable definintion to allow a program linking
    int v[10];
#endif
    return 0;
}

diff -urN tinycc.old/tccelf.c tinycc/tccelf.c
--- tinycc.old/tccelf.c 2015-03-25 18:37:57.000000000 +0300
+++ tinycc/tccelf.c     2015-03-25 18:38:34.000000000 +0300
@@ -1565,6 +1565,8 @@
         pinit[0] = 0xe8;
         put32(pinit + 1, -4);
         sym_index = find_elf_sym(symtab_section, "__bound_init");
+       if (!sym_index)
+            tcc_error("__bound_init not defined");
         put_elf_reloc(symtab_section, init_section,
                       init_section->data_offset - 4, R_386_PC32, sym_index);
     }



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