54 lines
1.6 KiB
Go
54 lines
1.6 KiB
Go
// Copyright 2024 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build (amd64 || arm64 || ppc64le || s390x) && !purego && linux
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package nistec
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import (
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"syscall"
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"testing"
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"unsafe"
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)
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// Lightly adapted from the bytes test package. Allocate a pair of T one at the start of a page, another at the
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// end. Any access beyond or before the page boundary should cause a fault. This is linux specific.
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func dangerousObjs[T any](t *testing.T) (start *T, end *T) {
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pagesize := syscall.Getpagesize()
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b, err := syscall.Mmap(0, 0, 3*pagesize, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANONYMOUS|syscall.MAP_PRIVATE)
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if err != nil {
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t.Fatalf("mmap failed %s", err)
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}
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err = syscall.Mprotect(b[:pagesize], syscall.PROT_NONE)
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if err != nil {
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t.Fatalf("mprotect low failed %s\n", err)
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}
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err = syscall.Mprotect(b[2*pagesize:], syscall.PROT_NONE)
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if err != nil {
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t.Fatalf("mprotect high failed %s\n", err)
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}
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b = b[pagesize : 2*pagesize]
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end = (*T)(unsafe.Pointer(&b[len(b)-(int)(unsafe.Sizeof(*end))]))
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start = (*T)(unsafe.Pointer(&b[0]))
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return start, end
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}
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func TestP256SelectAffinePageBoundary(t *testing.T) {
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var out p256AffinePoint
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begintp, endtp := dangerousObjs[p256AffineTable](t)
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for i := 0; i < 31; i++ {
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p256SelectAffine(&out, begintp, i)
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p256SelectAffine(&out, endtp, i)
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}
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}
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func TestP256SelectPageBoundary(t *testing.T) {
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var out P256Point
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begintp, endtp := dangerousObjs[p256Table](t)
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for i := 0; i < 15; i++ {
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p256Select(&out, begintp, i)
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p256Select(&out, endtp, i)
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}
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}
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