Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030206AbWHQTzE (ORCPT ); Thu, 17 Aug 2006 15:55:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030236AbWHQTyw (ORCPT ); Thu, 17 Aug 2006 15:54:52 -0400 Received: from e2.ny.us.ibm.com ([32.97.182.142]:15550 "EHLO e2.ny.us.ibm.com") by vger.kernel.org with ESMTP id S1030206AbWHQTyD (ORCPT ); Thu, 17 Aug 2006 15:54:03 -0400 Subject: [RFC][PATCH 1/8] mprotect patch for use by SLIM From: Kylene Jo Hall To: linux-kernel , LSM ML Cc: Dave Safford , Mimi Zohar , Serge Hallyn Content-Type: text/plain Date: Thu, 17 Aug 2006 12:53:05 -0700 Message-Id: <1155844385.6788.55.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 (2.0.4-7) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2521 Lines: 82 This small patch makes mprotect available for use by SLIM for write revocation. Updated to allow the usage locking to work properly. Signed-off-by: Mimi Zohar Signed-off-by: Kylene Hall --- include/linux/mm.h | 2 ++ mm/mprotect.c | 23 +++++++++++++++++------ 2 files changed, 19 insertions(+), 6 deletions(-) --- linux-2.6.18-rc3/mm/mprotect.c 2006-07-30 01:15:36.000000000 -0500 +++ linux-2.6.18-rc3-working/mm/mprotect.c 2006-08-07 13:11:07.000000000 -0500 @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -202,9 +203,10 @@ fail: vm_unacct_memory(charged); return error; } - -asmlinkage long -sys_mprotect(unsigned long start, size_t len, unsigned long prot) +/* + * Call holding the current->mm->mmap_sem for writing + */ +int do_mprotect(unsigned long start, size_t len, unsigned long prot) { unsigned long vm_flags, nstart, end, tmp, reqprot; struct vm_area_struct *vma, *prev; @@ -234,8 +236,6 @@ sys_mprotect(unsigned long start, size_t vm_flags = calc_vm_prot_bits(prot); - down_write(¤t->mm->mmap_sem); - vma = find_vma_prev(current->mm, start, &prev); error = -ENOMEM; if (!vma) @@ -298,6 +298,17 @@ sys_mprotect(unsigned long start, size_t } } out: - up_write(¤t->mm->mmap_sem); return error; } +EXPORT_SYMBOL_GPL(do_mprotect); + +asmlinkage long +sys_mprotect(unsigned long start, size_t len, unsigned long prot) +{ + int ret; + + down_write(¤t->mm->mmap_sem); + ret = do_mprotect(start, len, prot); + up_write(¤t->mm->mmap_sem); + return ret; +} --- linux-2.6.18-rc3/include/linux/mm.h 2006-07-30 01:15:36.000000000 -0500 +++ linux-2.6.18-rc3-working/include/linux/mm.h 2006-08-01 12:18:13.000000000 -0500 @@ -137,6 +137,8 @@ extern unsigned int kobjsize(const void #define VM_EXEC 0x00000004 #define VM_SHARED 0x00000008 +extern int do_mprotect(unsigned long start, size_t len, unsigned long prot); + /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ #define VM_MAYWRITE 0x00000020 - 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/