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Make *allocx() size class overflow behavior defined.

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Limit supported size and alignment to HUGE_MAXCLASS, which in turn is
now limited to be less than PTRDIFF_MAX.

This resolves #278 and #295.
This commit is contained in:
Jason Evans
2016-02-25 15:29:49 -08:00
parent 767d85061a
commit 0c516a00c4
14 changed files with 247 additions and 89 deletions
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30
test/integration/mallocx.c
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@@ -46,6 +46,35 @@ get_huge_size(size_t ind)
return (get_size_impl("arenas.hchunk.0.size", ind));
}
TEST_BEGIN(test_overflow)
{
size_t hugemax, size;
hugemax = get_huge_size(get_nhuge()-1);
assert_ptr_null(mallocx(hugemax+1, 0),
"Expected OOM for mallocx(size=%#zx, 0)", hugemax+1);
assert_ptr_null(mallocx(PTRDIFF_MAX+1, 0),
"Expected OOM for mallocx(size=%#zx, 0)", ZU(PTRDIFF_MAX+1));
assert_ptr_null(mallocx(SIZE_T_MAX, 0),
"Expected OOM for mallocx(size=%#zx, 0)", SIZE_T_MAX);
#if LG_SIZEOF_PTR == 3
size = ZU(0x600000000000000);
#else
size = ZU(0x6000000);
#endif
assert_ptr_null(mallocx(size, 0),
"Expected OOM for mallocx(size=%#zx, 0", size);
assert_ptr_null(mallocx(1, MALLOCX_ALIGN(PTRDIFF_MAX+1)),
"Expected OOM for mallocx(size=1, MALLOCX_ALIGN(%#zx))",
ZU(PTRDIFF_MAX+1));
}
TEST_END
TEST_BEGIN(test_oom)
{
size_t hugemax, size, alignment;
@@ -176,6 +205,7 @@ main(void)
{
return (test(
test_overflow,
test_oom,
test_basic,
test_alignment_and_size));