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mm: increase the default mlock limit from 32k to 64k

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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 <garloff@suse.de>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kurt Garloff 2008-10-29 14:00:48 -07:00 committed by Linus Torvalds
parent e946217e4f
commit 0833422274
1 changed files with 2 additions and 2 deletions
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4
include/linux/resource.h
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@ -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