From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933506Ab3EGNmp (ORCPT ); Tue, 7 May 2013 09:42:45 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:42645 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933421Ab3EGNmf (ORCPT ); Tue, 7 May 2013 09:42:35 -0400 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Robin Holt , Andrew Morton , Linus Torvalds , Luis Henriques Subject: [PATCH 116/118] ipc: sysv shared memory limited to 8TiB Date: Tue, 7 May 2013 14:39:22 +0100 Message-Id: <1367933964-1564-117-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1367933964-1564-1-git-send-email-luis.henriques@canonical.com> References: <1367933964-1564-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.5.7.12 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Robin Holt commit d69f3bad4675ac519d41ca2b11e1c00ca115cecd upstream. Trying to run an application which was trying to put data into half of memory using shmget(), we found that having a shmall value below 8EiB-8TiB would prevent us from using anything more than 8TiB. By setting kernel.shmall greater than 8EiB-8TiB would make the job work. In the newseg() function, ns->shm_tot which, at 8TiB is INT_MAX. ipc/shm.c: 458 static int newseg(struct ipc_namespace *ns, struct ipc_params *params) 459 { ... 465 int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT; ... 474 if (ns->shm_tot + numpages > ns->shm_ctlall) 475 return -ENOSPC; [akpm@linux-foundation.org: make ipc/shm.c:newseg()'s numpages size_t, not int] Signed-off-by: Robin Holt Reported-by: Alex Thorlton Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Luis Henriques --- include/linux/ipc_namespace.h | 2 +- ipc/shm.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h index 5499c92..c731973 100644 --- a/include/linux/ipc_namespace.h +++ b/include/linux/ipc_namespace.h @@ -42,8 +42,8 @@ struct ipc_namespace { size_t shm_ctlmax; size_t shm_ctlall; + unsigned long shm_tot; int shm_ctlmni; - int shm_tot; /* * Defines whether IPC_RMID is forced for _all_ shm segments regardless * of shmctl() diff --git a/ipc/shm.c b/ipc/shm.c index 41c1285..f5ba6ac 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -462,7 +462,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params) size_t size = params->u.size; int error; struct shmid_kernel *shp; - int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT; + size_t numpages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; struct file * file; char name[13]; int id; -- 1.8.1.2