From: Davidlohr Bueso <dave@stgolabs.net>
To: Waiman Long <longman@redhat.com>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>,
Kees Cook <keescook@chromium.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-doc@vger.kernel.org, Al Viro <viro@zeniv.linux.org.uk>,
Matthew Wilcox <willy@infradead.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Takashi Iwai <tiwai@suse.de>, Davidlohr Bueso <dbueso@suse.de>,
manfred@colorfullife.com
Subject: Re: [PATCH v8 1/5] ipc: IPCMNI limit check for msgmni and shmmni
Date: Fri, 17 Aug 2018 09:51:09 -0700 [thread overview]
Message-ID: <20180817165109.GC32382@linux-r8p5> (raw)
In-Reply-To: <1529317698-16575-2-git-send-email-longman@redhat.com>
On Mon, 18 Jun 2018, Waiman Long wrote:
>A user can write arbitrary integer values to msgmni and shmmni sysctl
>parameters without getting error, but the actual limit is really
>IPCMNI (32k). This can mislead users as they think they can get a
>value that is not real.
>
>The right limits are now set for msgmni and shmmni so that the users
>will become aware if they set a value outside of the acceptable range.
>
>Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
>---
> ipc/ipc_sysctl.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
>diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c
>index 8ad93c2..f87cb29 100644
>--- a/ipc/ipc_sysctl.c
>+++ b/ipc/ipc_sysctl.c
>@@ -99,6 +99,7 @@ static int proc_ipc_auto_msgmni(struct ctl_table *table, int write,
> static int zero;
> static int one = 1;
> static int int_max = INT_MAX;
>+static int ipc_mni = IPCMNI;
>
> static struct ctl_table ipc_kern_table[] = {
> {
>@@ -120,7 +121,9 @@ static int proc_ipc_auto_msgmni(struct ctl_table *table, int write,
> .data = &init_ipc_ns.shm_ctlmni,
> .maxlen = sizeof(init_ipc_ns.shm_ctlmni),
> .mode = 0644,
>- .proc_handler = proc_ipc_dointvec,
>+ .proc_handler = proc_ipc_dointvec_minmax,
>+ .extra1 = &zero,
>+ .extra2 = &ipc_mni,
> },
> {
> .procname = "shm_rmid_forced",
>@@ -147,7 +150,7 @@ static int proc_ipc_auto_msgmni(struct ctl_table *table, int write,
> .mode = 0644,
> .proc_handler = proc_ipc_dointvec_minmax,
> .extra1 = &zero,
>- .extra2 = &int_max,
>+ .extra2 = &ipc_mni,
> },
> {
> .procname = "auto_msgmni",
>--
>1.8.3.1
>
next prev parent reply other threads:[~2018-08-17 19:55 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-18 10:28 [PATCH v8 0/5] ipc: IPCMNI limit check for *mni & increase that limit Waiman Long
2018-06-18 10:28 ` [PATCH v8 1/5] ipc: IPCMNI limit check for msgmni and shmmni Waiman Long
2018-06-28 3:16 ` Luis R. Rodriguez
2018-08-17 16:51 ` Davidlohr Bueso [this message]
2018-06-18 10:28 ` [PATCH v8 2/5] ipc: IPCMNI limit check for semmni Waiman Long
2018-06-28 22:39 ` Luis R. Rodriguez
2018-06-29 7:26 ` Waiman Long
2018-08-17 16:53 ` Davidlohr Bueso
2018-06-18 10:28 ` [PATCH v8 3/5] ipc: Allow boot time extension of IPCMNI from 32k to 2M Waiman Long
2018-08-17 16:45 ` Davidlohr Bueso
2018-08-18 1:15 ` Waiman Long
2018-10-02 16:32 ` Manfred Spraul
2018-10-02 17:43 ` Waiman Long
2018-06-18 10:28 ` [PATCH v8 4/5] ipc: Conserve sequence numbers in extended IPCMNI mode Waiman Long
2018-06-18 10:28 ` [PATCH v8 5/5] ipc: Add a new ipcmni_compat sysctl to fall back to old behavior Waiman Long
2018-06-18 11:36 ` kbuild test robot
2018-06-18 14:27 ` kbuild test robot
2018-08-17 16:50 ` [PATCH v8 0/5] ipc: IPCMNI limit check for *mni & increase that limit Davidlohr Bueso
2018-09-06 22:24 ` Andrew Morton
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