mprotect fails with Out of Memory

[angerman]

While trying to get my haskell executable to run, I've run into the following peculiar situation:

[51044:41097578] mmap(addr: 0x0000000000000000 [host: 0x0000000000000000], len: 0x16000, prot: 0, flags: 34, fd: -1, offset: 0x0): ret = 0xc0793000
[51044:41097578] mprotect(addr: 0x00000000c0794000 [host: 0x000000010efa1000], len: 0x15000, prot: 3): ret = 0xfffffffffffffff4[LINUX_ENOMEM]
[51044:41097578] munmap(gaddr: 0x00000000c0793000 [host: 0x000000010efa0000], size: 0x16000): ret = 0x0

This seems like it's a valid mprotect call to a mmaped region that was just returned with an offset of 0x1000.

However we fail with bfe00000 != c0794000 + 15000 in L261:

noah/src/mm/mmap.c

Lines 251 to 266 in b61c85c

	while (region->gaddr + region->size <= end) {
	hv_vm_protect(region->gaddr, region->size, hvprot);
	mprotect(region->haddr, region->size, prot);
	region->prot = hvprot;
	if (region->list.next == &proc.mm->mm_regions) {
	ret = -LINUX_ENOMEM;
	goto out;
	}
	struct mm_region *next = list_entry(region->list.next, struct mm_region, list);
	if (next->gaddr != region->gaddr + region->size) {
	ret = -LINUX_ENOMEM;
	goto out;
	}
	region = next;
	}

[tommythorn]

I forked https://github.com/johnothwolo/noah and reproduce this issue using test/testing_root/usr/bin/file. I don't know if this has regressed or if it ever worked, but it looks like this repo is dead and you have more luck with John's fork.

[johnothwolo]

Could you link the program you were trying to run?