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| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2018-06-04 08:41:27 +0200 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2018-06-05 21:16:51 +0200 |
| commit | 6d3344324b5ae49fc8cb599a2c687e5607ba6e9f (patch) | |
| tree | 491427d7aca44d874fbbba56c2b3103f5f4725d1 | |
| parent | lib: add runtime test of check_*_overflow functions (diff) | |
| download | linux-6d3344324b5ae49fc8cb599a2c687e5607ba6e9f.tar.xz linux-6d3344324b5ae49fc8cb599a2c687e5607ba6e9f.zip | |
test_overflow: macrofy some more, do more tests for free
Obviously a+b==b+a and a*b==b*a, but the implementation of the fallback
checks are not entirely symmetric in how they treat a and b. So we might
as well check the (b,a,r,of) tuple as well as the (a,b,r,of) one for +
and *. Rather than more copy-paste, factor out the common part to
check_one_op.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Kees Cook <keescook@chromium.org>
| -rw-r--r-- | lib/test_overflow.c | 48 |
1 files changed, 22 insertions, 26 deletions
diff --git a/lib/test_overflow.c b/lib/test_overflow.c index af01e46500be..fa87e283b149 100644 --- a/lib/test_overflow.c +++ b/lib/test_overflow.c @@ -211,35 +211,31 @@ DEFINE_TEST_ARRAY(s64) = { {0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false}, }; +#define check_one_op(t, fmt, op, sym, a, b, r, of) do { \ + t _r; \ + bool _of; \ + \ + _of = check_ ## op ## _overflow(a, b, &_r); \ + if (_of != of) { \ + pr_warn("expected "fmt" "sym" "fmt \ + " to%s overflow (type %s)\n", \ + a, b, of ? "" : " not", #t); \ + } \ + if (_r != r) { \ + pr_warn("expected "fmt" "sym" "fmt" == " \ + fmt", got "fmt" (type %s)\n", \ + a, b, r, _r, #t); \ + } \ +} while (0) + #define DEFINE_TEST_FUNC(t, fmt) \ static void __init do_test_ ## t(const struct test_ ## t *p) \ { \ - t r; \ - bool of; \ - \ - of = check_add_overflow(p->a, p->b, &r); \ - if (of != p->s_of) \ - pr_warn("expected "fmt" + "fmt" to%s overflow (type %s)\n", \ - p->a, p->b, p->s_of ? "" : " not", #t); \ - if (r != p->sum) \ - pr_warn("expected "fmt" + "fmt" == "fmt", got "fmt" (type %s)\n", \ - p->a, p->b, p->sum, r, #t); \ - \ - of = check_sub_overflow(p->a, p->b, &r); \ - if (of != p->d_of) \ - pr_warn("expected "fmt" - "fmt" to%s overflow (type %s)\n", \ - p->a, p->b, p->s_of ? "" : " not", #t); \ - if (r != p->diff) \ - pr_warn("expected "fmt" - "fmt" == "fmt", got "fmt" (type %s)\n", \ - p->a, p->b, p->diff, r, #t); \ - \ - of = check_mul_overflow(p->a, p->b, &r); \ - if (of != p->p_of) \ - pr_warn("expected "fmt" * "fmt" to%s overflow (type %s)\n", \ - p->a, p->b, p->p_of ? "" : " not", #t); \ - if (r != p->prod) \ - pr_warn("expected "fmt" * "fmt" == "fmt", got "fmt" (type %s)\n", \ - p->a, p->b, p->prod, r, #t); \ + check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \ + check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \ + check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \ + check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \ + check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \ } \ \ static void __init test_ ## t ## _overflow(void) { \ |