Commit 2a530080 authored Jan 01, 2009 by Rusty Russell

cpumask: zero extra bits in alloc_cpumask_var_node



Impact: extra safety checks during transition

When CONFIG_CPUMASKS_OFFSTACK is set, the new cpumask_ operators only
use bits up to nr_cpu_ids, not NR_CPUS.  Using the old cpus_ operators
on these masks can mean accessing undefined bits.

After some discussion, Mike and I decided to err on the side of caution;
we zero the "undefined" bits in alloc_cpumask_var_node() until all the
old cpumask functions are removed.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

parent 5db0e1e9

lib/cpumask.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -107,6 +107,14 @@ bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
		dump_stack();
		}
		#endif
		/* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */
		if (*mask) {
		unsigned int tail;
		tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long);
		memset(cpumask_bits(*mask) + cpumask_size() - tail,
		0, tail);
		}

		return *mask != NULL;
		}
		EXPORT_SYMBOL(alloc_cpumask_var_node);