From c4f3eb5fc527b749d6fb0d47ffdcfe83706dbe2f Mon Sep 17 00:00:00 2001 From: James Yang Date: Fri, 14 Nov 2014 12:32:24 -0600 Subject: [PATCH] powerpc/mm/hugetlb: Sanity check gigantic hugepage count Limit the number of gigantic hugepages specified by the hugepages= parameter to MAX_NUMBER_GPAGES. Signed-off-by: James Yang Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/mm/hugetlbpage.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index af56de82375d..747e0c616526 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -355,6 +355,13 @@ static int __init do_gpage_early_setup(char *param, char *val, if (size != 0) { if (sscanf(val, "%lu", &npages) <= 0) npages = 0; + if (npages > MAX_NUMBER_GPAGES) { + pr_warn("MMU: %lu pages requested for page " + "size %llu KB, limiting to " + __stringify(MAX_NUMBER_GPAGES) "\n", + npages, size / 1024); + npages = MAX_NUMBER_GPAGES; + } gpage_npages[shift_to_mmu_psize(__ffs(size))] = npages; size = 0; } -- 2.20.1