+ arch_numa-avoid-false-positive-fortify-warning-in-setup_node_to_cpumask_map.patch added to mm-unstable branch

The patch titled
     Subject: arch_numa: avoid false positive fortify warning in setup_node_to_cpumask_map()
has been added to the -mm mm-unstable branch.  Its filename is
     arch_numa-avoid-false-positive-fortify-warning-in-setup_node_to_cpumask_map.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arch_numa-avoid-false-positive-fortify-warning-in-setup_node_to_cpumask_map.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Nathan Chancellor <[email protected]>
Subject: arch_numa: avoid false positive fortify warning in setup_node_to_cpumask_map()
Date: Thu, 13 Aug 2026 20:12:55 -0700

When building ARCH=riscv using clang with CONFIG_FORTIFY_SOURCE and
CONFIG_UBSAN_BOUNDS enabled, CONFIG_NR_CPUS > 64, and the default value of
2 for CONFIG_NODES_SHIFT, there is a compiletime warning from the fortify
routines.

  In file included from mm/arch_numa.c:11:
  In file included from include/linux/acpi.h:14:
  In file included from include/linux/resource_ext.h:11:
  In file included from include/linux/slab.h:17:
  In file included from include/linux/gfp.h:7:
  In file included from include/linux/mmzone.h:8:
  In file included from include/linux/spinlock.h:60:
  In file included from include/linux/interrupt_rc.h:17:
  In file included from include/linux/smp.h:13:
  In file included from include/linux/cpumask.h:11:
  In file included from include/linux/bitmap.h:13:
  In file included from include/linux/string.h:383:
  include/linux/fortify-string.h:430:4: warning: call to '__write_overflow_field' declared with 'warning' attribute: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribue-warning]
    430 |                         __write_overflow_field(p_size_field, size);
        |                         ^
  include/linux/fortify-string.h:430:4: note: called by function 'fortify_memset_chk(unsigned long, unsigned long, unsigned long)'
  include/linux/bitmap.h:248:3: note: inlined by function 'setup_node_to_cpumask_map'
    248 |                 memset(dst, 0, len);
        |                 ^
  include/linux/fortify-string.h:462:25: note: expanded from macro 'memset'
    462 | #define memset(p, c, s) __fortify_memset_chk(p, c, s,                   \
        |                         ^
  include/linux/fortify-string.h:453:2: note: expanded from macro '__fortify_memset_chk'
    453 |         fortify_memset_chk(__fortify_size, p_size, p_size_field),       \
        |         ^
  include/linux/fortify-string.h:430:4: note: use '-gline-directives-only' (implied by '-g1') or higher for more accurate inlining chain locations
    430 |                         __write_overflow_field(p_size_field, size);
        |                         ^
  1 warning generated.

In this configuration, MAX_NUMNODES is 4.  clang unrolls the for loop in
setup_node_to_cpumask_map() past this, which triggers the fortify check
when accessing node_to_cpumask_map on the theoretical fifth loop iteration
because it would be an out of bounds write.

Make it clear to clang that nr_node_ids is bounded by MAX_NUMNODES due to
the logic in setup_nr_node_ids() by early returning in
setup_node_to_cpumask_map() should that condition be violated.

Link: https://lore.kernel.org/20260813-arch_numa-avoid-fortify-warning-v2-1-093ad97a78df@kernel.org
Signed-off-by: Nathan Chancellor <[email protected]>
Closes: https://github.com/ClangBuiltLinux/linux/issues/2174
Cc: Kees Cook <[email protected]>
Cc: Bill Wendling <[email protected]>
Cc: Justin Stitt <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---

 mm/arch_numa.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/mm/arch_numa.c~arch_numa-avoid-false-positive-fortify-warning-in-setup_node_to_cpumask_map
+++ a/mm/arch_numa.c
@@ -105,6 +105,18 @@ static void __init setup_node_to_cpumask
 	if (nr_node_ids == MAX_NUMNODES)
 		setup_nr_node_ids();
 
+	/*
+	 * This check should never be true but it makes it clear to compilers
+	 * that node_to_cpumask_map is bound by nr_node_ids, avoiding false
+	 * positive fortify warnings when accessing node_to_cpumask_map in the
+	 * for loop below.
+	 */
+	if (unlikely(nr_node_ids > MAX_NUMNODES)) {
+		pr_err("nr_node_ids (%u) is larger than MAX_NUMNODES (%u)\n",
+		       nr_node_ids, MAX_NUMNODES);
+		return;
+	}
+
 	/* allocate and clear the mapping */
 	for (node = 0; node < nr_node_ids; node++) {
 		alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
_

Patches currently in -mm which might be from [email protected] are

arch_numa-avoid-false-positive-fortify-warning-in-setup_node_to_cpumask_map.patch