Differential D33070 Diff 98804 tests/sys/kern/coredump_phnum_helper.c

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	/*			/*
	* This program is intended to create a bunch of segment mappings, then dump			* This program is intended to create a bunch of segment mappings, then dump
	* core.			* core.
	*/			*/
	int			int
	main(int argc __unused, char **argv __unused)			main(int argc __unused, char **argv __unused)
	{			{
	void *v;			void *v;
	unsigned i;			size_t i, pages;

	for (i = 0; i < UINT16_MAX + 1000; i++) {			pages = UINT16_MAX + 1000;
	/*			v = mmap(NULL, pages * PAGE_SIZE, PROT_READ \| PROT_WRITE,
	* Alternate protections; otherwise the kernel will just extend
	* the adjacent same-protection previous mapping.
	*/
	v = mmap(NULL, PAGE_SIZE,
	(((i % 2) == 0) ? PROT_READ : 0) \| PROT_WRITE,
	MAP_ANON \| MAP_PRIVATE, -1, 0);			MAP_ANON \| MAP_PRIVATE, -1, 0);
	if (v == MAP_FAILED)			if (v == NULL)
	err(1, "mmap");			err(1, "mmap");
				for (i = 0; i < pages; i += 2) {
				/*
				* Alternate protections to interleave RW and R PT_LOAD
				* segments.
				*/
				if (mprotect((char )v + i PAGE_SIZE, PAGE_SIZE,
				PROT_READ) != 0)
				err(1, "mprotect");
				kibUnsubmitted Not Done Inline Actions Since you are mprotect'ing at the page (i+1), shouldn't loop use i < pages - 1 as the stop condition? For me, it looks like you are changing protection of one page after the mmaped region. Or change mmap to allocate pages + 1 pages. kib: Since you are mprotect'ing at the page (i+1), shouldn't loop use i < pages - 1 as the stop…
	}			}

	/* Dump core. */			/* Dump core. */
	abort();			abort();
	}			}