Viewing file:  taint-alloc-1.c (3.21 KB) -rw-r--r--
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// TODO: remove need for this option
/* { dg-additional-options "-fanalyzer-checker=taint" } */
/* { dg-require-effective-target alloca } */
#include "analyzer-decls.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct foo
{
size_t sz;
};
/* malloc with tainted size. */
void *test_1 (FILE *f)
{
struct foo tmp;
if (1 == fread(&tmp, sizeof(tmp), 1, f)) { /* { dg-message "\\(\[0-9\]+\\) 'tmp' gets an unchecked value here" "event: tmp gets unchecked value" { xfail *-*-* } } */
/* { dg-message "\\(\[0-9\]+\\) following 'true' branch\\.\\.\\." "event: following true branch" { target *-*-* } .-1 } */
__analyzer_dump_state ("taint", tmp.sz); /* { dg-warning "state: 'tainted'" } */
/* { dg-message "\\(\[0-9\]+\\) \\.\\.\\.to here" "event: to here" { target *-*-* } .-1 } */
return malloc (tmp.sz); /* { dg-warning "use of attacker-controlled value 'tmp\\.sz' as allocation size without upper-bounds checking" "warning" } */
/* { dg-message "23: \\(\[0-9\]+\\) 'tmp.i' has an unchecked value here \\(from 'tmp'\\)" "event: tmp.i has an unchecked value" { xfail *-*-* } .-1 } */
/* { dg-message "\\(\[0-9\]+\\) use of attacker-controlled value 'tmp\\.sz' as allocation size without upper-bounds checking" "final event" { target *-*-* } .-2 } */
/* { dg-message "heap-based allocation" "memory space" { target *-*-* } .-3 } */
// TOOD: better messages for state changes
}
return 0;
}
/* VLA with tainted size. */
void *test_2 (FILE *f)
{
struct foo tmp;
if (1 == fread(&tmp, sizeof(tmp), 1, f)) { /* { dg-message "\\(\[0-9\]+\\) 'tmp' gets an unchecked value here" "event: tmp gets unchecked value" { xfail *-*-* } } */
/* { dg-message "\\(\[0-9\]+\\) following 'true' branch\\.\\.\\." "event: following true branch" { target *-*-* } .-1 } */
__analyzer_dump_state ("taint", tmp.sz); /* { dg-warning "state: 'tainted'" } */
/* { dg-message "\\(\[0-9\]+\\) \\.\\.\\.to here" "event: to here" { target *-*-* } .-1 } */
/* VLA with tainted size. */
{
char buf[tmp.sz]; /* { dg-warning "use of attacker-controlled value 'tmp\\.sz' as allocation size without upper-bounds checking" "warning" } */
/* { dg-message "\\(\[0-9\]+\\) 'tmp.i' has an unchecked value here \\(from 'tmp'\\)" "event: tmp.i has an unchecked value" { xfail *-*-* } .-1 } */
/* { dg-message "\\(\[0-9\]+\\) use of attacker-controlled value 'tmp\\.sz' as allocation size without upper-bounds checking" "final event" { target *-*-* } .-2 } */
/* { dg-message "stack-based allocation" "memory space" { target *-*-* } .-3 } */
fread (buf, tmp.sz, 1, f);
}
// TOOD: better messages for state changes
}
return 0;
}
void *test_3 (FILE *f)
{
int num;
fread (&num, sizeof (int), 1, f);
__analyzer_dump_state ("taint", num); /* { dg-warning "state: 'tainted'" } */
__analyzer_dump_state ("taint", num * 16); /* { dg-warning "state: 'tainted'" } */
__analyzer_dump_state ("taint", (size_t)(num * 16)); /* { dg-warning "state: 'tainted'" } */
return malloc (num * 16); /* { dg-warning "use of attacker-controlled value 'num \\* 16' as allocation size without upper-bounds checking" } */
}
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