From 9210807cb5a3f19a0e954dd401e3a2c3626d1b48 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Fri, 19 Sep 2008 10:43:06 -0400 Subject: [PATCH] [ARM] prevent the vmalloc cmdline argument from eating all memory Commit 8d5796d2ec6b5a4e7a52861144e63af438d6f8f7 allows for the vmalloc area to be resized from the kernel cmdline. Make sure it cannot overlap with RAM entirely. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/mm/mmu.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index ab511d94d917..636cf8fc70ef 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -646,6 +646,13 @@ static void __init early_vmalloc(char **arg) "vmalloc area too small, limiting to %luMB\n", vmalloc_reserve >> 20); } + + if (vmalloc_reserve > VMALLOC_END - (PAGE_OFFSET + SZ_32M)) { + vmalloc_reserve = VMALLOC_END - (PAGE_OFFSET + SZ_32M); + printk(KERN_WARNING + "vmalloc area is too big, limiting to %luMB\n", + vmalloc_reserve >> 20); + } } __early_param("vmalloc=", early_vmalloc); -- 2.30.2