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[79.180.2.31]) by smtp.gmail.com with ESMTPSA id v11sm17608252eds.14.2021.03.02.01.51.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Mar 2021 01:51:25 -0800 (PST) Date: Tue, 2 Mar 2021 04:51:23 -0500 From: "Michael S. Tsirkin" To: Jason Wang Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] vhost-vdpa: honor CAP_IPC_LOCK Message-ID: <20210302044918-mutt-send-email-mst@kernel.org> References: <20210302091418.7226-1-jasowang@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210302091418.7226-1-jasowang@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 02, 2021 at 04:14:18AM -0500, Jason Wang wrote: > When CAP_IPC_LOCK is set we should not check locked memory against > rlimit as what has been implemented in mlock(). > > Signed-off-by: Jason Wang Indeed and it's not just mlock. Documentation/admin-guide/perf-security.rst: RLIMIT_MEMLOCK and perf_event_mlock_kb resource constraints are ignored for processes with the CAP_IPC_LOCK capability. and let's add a Fixes: tag? > --- > drivers/vhost/vdpa.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c > index ef688c8c0e0e..e93572e2e344 100644 > --- a/drivers/vhost/vdpa.c > +++ b/drivers/vhost/vdpa.c > @@ -638,7 +638,8 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, > mmap_read_lock(dev->mm); > > lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; > - if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) { > + if (!capable(CAP_IPC_LOCK) && > + (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit)) { > ret = -ENOMEM; > goto unlock; > } > -- > 2.18.1