Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH for 2.6.15] Make sure interleave masks have at least one node set | Date | Tue, 3 Jan 2006 00:07:28 +0100 |
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Otherwise a bad mem policy system call can confuse the interleaving code into referencing undefined nodes.
Originally reported by Doug Chapman
I was told it's CVE-2005-3358 (one has to love these security people - they make everything sound important)
Signed-off-by: Andi Kleen <ak@suse.de>
Index: linux-2.6.15rc7-work/mm/mempolicy.c =================================================================== --- linux-2.6.15rc7-work.orig/mm/mempolicy.c +++ linux-2.6.15rc7-work/mm/mempolicy.c @@ -161,6 +161,10 @@ static struct mempolicy *mpol_new(int mo switch (mode) { case MPOL_INTERLEAVE: policy->v.nodes = *nodes; + if (nodes_weight(*nodes) == 0) { + kmem_cache_free(policy_cache, policy); + return ERR_PTR(-EINVAL); + } break; case MPOL_PREFERRED: policy->v.preferred_node = first_node(*nodes); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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