CVE-2024-42243: mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray
In the Linux kernel, the following vulnerability has been resolved:

mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray

Patch series "mm/filemap: Limit page cache size to that supported by
xarray", v2.

Currently, xarray can't support arbitrary page cache size.  More details
can be found from the WARN_ON() statement in xas_split_alloc().  In our
test whose code is attached below, we hit the WARN_ON() on ARM64 system
where the base page size is 64KB and huge page size is 512MB.  The issue
was reported long time ago and some discussions on it can be found here
[1].

[1] https://www.spinics.net/lists/linux-xfs/msg75404.html

In order to fix the issue, we need to adjust MAX_PAGECACHE_ORDER to one
supported by xarray and avoid PMD-sized page cache if needed.  The code
changes are suggested by David Hildenbrand.

PATCH[1] adjusts MAX_PAGECACHE_ORDER to that supported by xarray
PATCH[2-3] avoids PMD-sized page cache in the synchronous readahead path
PATCH[4] avoids PMD-sized page cache for shmem files if needed

Test program
============
# cat test.c
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/syscall.h>
#include <sys/mman.h>

#define TEST_XFS_FILENAME	"/tmp/data"
#define TEST_SHMEM_FILENAME	"/dev/shm/data"
#define TEST_MEM_SIZE		0x20000000

int main(int argc, char **argv)
{
	const char *filename;
	int fd = 0;
	void *buf = (void *)-1, *p;
	int pgsize = getpagesize();
	int ret;

	if (pgsize != 0x10000) {
		fprintf(stderr, "64KB base page size is required\n");
		return -EPERM;
	}

	system("echo force > /sys/kernel/mm/transparent_hugepage/shmem_enabled");
	system("rm -fr /tmp/data");
	system("rm -fr /dev/shm/data");
	system("echo 1 > /proc/sys/vm/drop_caches");

	/* Open xfs or shmem file */
	filename = TEST_XFS_FILENAME;
	if (argc > 1 && !strcmp(argv[1], "shmem"))
		filename = TEST_SHMEM_FILENAME;

	fd = open(filename, O_CREAT | O_RDWR | O_TRUNC);
	if (fd < 0) {
		fprintf(stderr, "Unable to open <%s>\n", filename);
		return -EIO;
	}

	/* Extend file size */
	ret = ftruncate(fd, TEST_MEM_SIZE);
	if (ret) {
		fprintf(stderr, "Error %d to ftruncate()\n", ret);
		goto cleanup;
	}

	/* Create VMA */
	buf = mmap(NULL, TEST_MEM_SIZE,
		   PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	if (buf == (void *)-1) {
		fprintf(stderr, "Unable to mmap <%s>\n", filename);
		goto cleanup;
	}

	fprintf(stdout, "mapped buffer at 0x%p\n", buf);
	ret = madvise(buf, TEST_MEM_SIZE, MADV_HUGEPAGE);
        if (ret) {
		fprintf(stderr, "Unable to madvise(MADV_HUGEPAGE)\n");
		goto cleanup;
	}

	/* Populate VMA */
	ret = madvise(buf, TEST_MEM_SIZE, MADV_POPULATE_WRITE);
	if (ret) {
		fprintf(stderr, "Error %d to madvise(MADV_POPULATE_WRITE)\n", ret);
		goto cleanup;
	}

	/* Punch the file to enforce xarray split */
	ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
        		TEST_MEM_SIZE - pgsize, pgsize);
	if (ret)
		fprintf(stderr, "Error %d to fallocate()\n", ret);

cleanup:
	if (buf != (void *)-1)
		munmap(buf, TEST_MEM_SIZE);
	if (fd > 0)
		close(fd);

	return 0;
}

# gcc test.c -o test
# cat /proc/1/smaps | grep KernelPageSize | head -n 1
KernelPageSize:       64 kB
# ./test shmem
   :
------------[ cut here ]------------
WARNING: CPU: 17 PID: 5253 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128
Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib  \
nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct    \
nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4    \
ip_set nf_tables rfkill nfnetlink vfat fat virtio_balloon          \
drm fuse xfs libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64  \
virtio_net sha1_ce net_failover failover virtio_console virtio_blk \
dimlib virtio_mmio
CPU: 17 PID: 5253 Comm: test Kdump: loaded Tainted: G W 6.10.0-rc5-gavin+ #12
Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024
pstate: 83400005 (Nzcv daif +PAN -UAO +TC
---truncated---
CVSS v3.1: 5.5