From 0833422274ff00729a603b020fac297e69a03e40 Mon Sep 17 00:00:00 2001 From: Kurt Garloff Date: Wed, 29 Oct 2008 14:00:48 -0700 Subject: mm: increase the default mlock limit from 32k to 64k By default, non-privileged tasks can only mlock() a small amount of memory to avoid a DoS attack by ordinary users. The Linux kernel defaulted to 32k (on a 4k page size system) to accommodate the needs of gpg. However, newer gpg2 needs 64k in various circumstances and otherwise fails miserably, see bnc#329675. Change the default to 64k, and make it more agnostic to PAGE_SIZE. Signed-off-by: Kurt Garloff Signed-off-by: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/resource.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/resource.h b/include/linux/resource.h index aaa423a6f3d..40fc7e62608 100644 --- a/include/linux/resource.h +++ b/include/linux/resource.h @@ -59,10 +59,10 @@ struct rlimit { #define _STK_LIM (8*1024*1024) /* - * GPG wants 32kB of mlocked memory, to make sure pass phrases + * GPG2 wants 64kB of mlocked memory, to make sure pass phrases * and other sensitive information are never written to disk. */ -#define MLOCK_LIMIT (8 * PAGE_SIZE) +#define MLOCK_LIMIT ((PAGE_SIZE > 64*1024) ? PAGE_SIZE : 64*1024) /* * Due to binary compatibility, the actual resource numbers -- cgit v1.2.3