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SubjectRe: [PATCH v8 1/5] ipc: IPCMNI limit check for msgmni and shmmni
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
>

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