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regress/mmap: Test hints in VM-area edge cases

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Test mmap(2) with hint above VM_MAXUSER_ADDRESS without MAP_FIXED.
This tests uvm_map.c,v 1.355.

Also test the lower boundary below PAGE_SIZE.

ok kettenis@
This commit is contained in:
cludwig
2026-02-26 14:05:25 +00:00
parent ea5864645b
commit da8c54306e
1 changed files with 13 additions and 2 deletions
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15
regress/sys/uvm/mmap_hint/mmap_hint.c
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@@ -1,4 +1,4 @@
/* $OpenBSD: mmap_hint.c,v 1.6 2021/12/13 16:56:50 deraadt Exp $ */
/* $OpenBSD: mmap_hint.c,v 1.7 2026/02/26 14:05:25 cludwig Exp $ */
/*
* Copyright (c) 2011 Ariane van der Steldt <ariane@stack.nl>
*
@@ -52,7 +52,8 @@ mmap_hint(void *hint)
else
delta = p - hint;
if (hint != NULL && delta > MAX_HINT_DIST) {
if (hint != NULL && hint < (void *)VM_MAXUSER_ADDRESS &&
delta > MAX_HINT_DIST) {
warnx("hinted allocation more than %#zx bytes away from hint: "
"hint %p, result %p", delta, hint, p);
errors++;
@@ -100,5 +101,15 @@ main()
}
skip4:
/* Check hinted allocation below PAGE_SIZE. */
hint = (void *)1UL;
fprintf(stderr, "5: Checking hint below PAGE_SIZE %p mmap\n", hint);
p = mmap_hint(hint);
/* Check hinted allocation above userspace. */
hint = (void *)VM_MAX_ADDRESS;
fprintf(stderr, "6: Checking hint at VM_MAX_ADDRESS %p mmap\n", hint);
p = mmap_hint(hint);
return errors;
}