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POsplint how to perform taint analysis
 

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  1. POsplint how to perform taint analysis
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    <p>How to perform Taint Analysis using Splint?</p> <p>I have installed Splint on my Ubuntu 12.04. Created a small test case as below:</p> <pre><code>#include&lt;stdio.h&gt; #include&lt;string.h&gt; int main(int argc, char *argv[]) { char a[10]; strncpy(a,argv[1],10); printf(a); return 0; } </code></pre> <p>Also created splint.xh file with the following contents:</p> <pre><code>int printf (/*@untainted@*/ char *fmt, ...); char *fgets (char *s, int n, FILE *stream) /*@ensures tainted s@*/ ; char *strcat (/*@returned@*/ char *s1, char *s2) /*@ensures s1:taintedness = s1:taintedness | s2:taintedness @*/ ; void strncpy (/*@returned@*/ char *s1, char *s2, size_t num) /*@ensures s1:taintedness = s1:taintedness | s2:taintedness @*/ ; </code></pre> <p>Also created splint.mts file with the below contents:</p> <pre><code> attribute taintedness context reference char * oneof untainted, tainted annotations tainted reference ==&gt; tainted untainted reference ==&gt; untainted transfers tainted as untainted ==&gt; error "Possibly tainted storage used where untainted required." merge tainted + untainted ==&gt; tainted defaults reference ==&gt; tainted literal ==&gt; untainted null ==&gt; untainted end </code></pre> <p>Then finally ran the splint tool with the command:</p> <pre><code> splint -mts splint prg001.c </code></pre> <p>Where prg001.c is the sample input, "splint" refers to splint.mts and splint.xh file. All the files are in the current directory.</p> <p>The output I received is:</p> <p>Splint 3.1.2 --- 21 Aug 2012</p> <p>prg001.c: (in function main) prg001.c:6:1: Format string parameter to printf is not a compile-time constant: a Format parameter is not known at compile-time. This can lead to security vulnerabilities because the arguments cannot be type checked. (Use -formatconst to inhibit warning) prg001.c:3:14: Parameter argc not used A function parameter is not used in the body of the function. If the argument is needed for type compatibility or future plans, use /<em>@unused@</em>/ in the argument declaration. (Use -paramuse to inhibit warning)</p> <p>Finished checking --- 2 code warnings</p> <p>There is no hint of any taint analysis in the output. Can someone please help me on how to get the taint analysis done using Splint.</p> <p>Thanks</p>
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    1. COI also tested by taking input into char array from fgets function and printing it. But output had no clue regarding taint
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    2. COThe problem was with splint.xh file. I change the printf to printfxxx and it worked fine. This implied that standard definition was overwriting my .xh file. This solved my problem
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