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Date:   Wed, 11 Mar 2020 13:01:07 -0700
From:   Bjorn Andersson <bjorn.andersson@linaro.org>
To:     Arnaud POULIQUEN <arnaud.pouliquen@st.com>
Cc:     Nikita Shubin <nshubin@topcon.com>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        Ohad Ben-Cohen <ohad@wizery.com>,
        "linux-remoteproc@vger.kernel.org" <linux-remoteproc@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>
Subject: Re: [PATCH v5] remoteproc: Fix NULL pointer dereference in
 rproc_virtio_notify
Message-ID: <20200311200107.GZ1214176@minitux>
References: <20200306070325.15232-1-NShubin@topcon.com>
 <20200306072452.24743-1-NShubin@topcon.com>
 <6c7ef4f2-6f71-c2fb-b2e9-ad7cbeb7cfbc@st.com>
 <20200310120846.GA19430@topcon.com>
 <507197c5412e4b438aeb5c527be74b3a@SFHDAG3NODE1.st.com>
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On Tue 10 Mar 06:19 PDT 2020, Arnaud POULIQUEN wrote:

> 
> 
> > -----Original Message-----
> > From: linux-remoteproc-owner@vger.kernel.org <linux-remoteproc-
> > owner@vger.kernel.org> On Behalf Of Nikita Shubin
> > Sent: mardi 10 mars 2020 13:09
> > To: Arnaud POULIQUEN <arnaud.pouliquen@st.com>
> > Cc: stable@vger.kernel.org; Ohad Ben-Cohen <ohad@wizery.com>; Bjorn
> > Andersson <bjorn.andersson@linaro.org>; linux-
> > remoteproc@vger.kernel.org; linux-kernel@vger.kernel.org; Mathieu Poirier
> > <mathieu.poirier@linaro.org>
> > Subject: Re: [PATCH v5] remoteproc: Fix NULL pointer dereference in
> > rproc_virtio_notify
> > 
> > On Mon, Mar 09, 2020 at 03:22:24PM +0100, Arnaud POULIQUEN wrote:
> > > Hi,
> > >
> > > sorry for the late answer...
> > >
> > > On 3/6/20 8:24 AM, Nikita Shubin wrote:
> > > > Undefined rproc_ops .kick method in remoteproc driver will result in
> > > > "Unable to handle kernel NULL pointer dereference" in
> > > > rproc_virtio_notify, after firmware loading if:
> > > >
> > > >  1) .kick method wasn't defined in driver
> > > >  2) resource_table exists in firmware and has "Virtio device entry"
> > > > defined
> > > >
> > > > Let's refuse to register an rproc-induced virtio device if no kick
> > > > method was defined for rproc.
> > > >
> > > > [   13.180049][  T415] 8<--- cut here ---
> > > > [   13.190558][  T415] Unable to handle kernel NULL pointer dereference
> > at virtual address 00000000
> > > > [   13.212544][  T415] pgd = (ptrval)
> > > > [   13.217052][  T415] [00000000] *pgd=00000000
> > > > [   13.224692][  T415] Internal error: Oops: 80000005 [#1] PREEMPT SMP
> > ARM
> > > > [   13.231318][  T415] Modules linked in: rpmsg_char imx_rproc
> > virtio_rpmsg_bus rpmsg_core [last unloaded: imx_rproc]
> > > > [   13.241687][  T415] CPU: 0 PID: 415 Comm: unload-load.sh Not tainted
> > 5.5.2-00002-g707df13bbbdd #6
> > > > [   13.250561][  T415] Hardware name: Freescale i.MX7 Dual (Device Tree)
> > > > [   13.257009][  T415] PC is at 0x0
> > > > [   13.260249][  T415] LR is at rproc_virtio_notify+0x2c/0x54
> > > > [   13.265738][  T415] pc : [<00000000>]    lr : [<8050f6b0>]    psr: 60010113
> > > > [   13.272702][  T415] sp : b8d47c48  ip : 00000001  fp : bc04de00
> > > > [   13.278625][  T415] r10: bc04c000  r9 : 00000cc0  r8 : b8d46000
> > > > [   13.284548][  T415] r7 : 00000000  r6 : b898f200  r5 : 00000000  r4 :
> > b8a29800
> > > > [   13.291773][  T415] r3 : 00000000  r2 : 990a3ad4  r1 : 00000000  r0 :
> > b8a29800
> > > > [   13.299000][  T415] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA
> > ARM  Segment none
> > > > [   13.306833][  T415] Control: 10c5387d  Table: b8b4806a  DAC: 00000051
> > > > [   13.313278][  T415] Process unload-load.sh (pid: 415, stack limit =
> > 0x(ptrval))
> > > > [   13.320591][  T415] Stack: (0xb8d47c48 to 0xb8d48000)
> > > > [   13.325651][  T415] 7c40:                   b895b680 00000001 b898f200 803c6430
> > b895bc80 7f00ae18
> > > > [   13.334531][  T415] 7c60: 00000035 00000000 00000000 b9393200
> > 80b3ed80 00004000 b9393268 bbf5a9a2
> > > > [   13.343410][  T415] 7c80: 00000e00 00000200 00000000 7f00aff0 7f00a014
> > b895b680 b895b800 990a3ad4
> > > > [   13.352290][  T415] 7ca0: 00000001 b898f210 b898f200 00000000
> > 00000000 7f00e000 00000001 00000000
> > > > [   13.361170][  T415] 7cc0: 00000000 803c62e0 80b2169c 802a0924
> > b898f210 00000000 00000000 b898f210
> > > > [   13.370049][  T415] 7ce0: 80b9ba44 00000000 80b9ba48 00000000
> > 7f00e000 00000008 80b2169c 80400114
> > > > [   13.378929][  T415] 7d00: 80b2169c 8061fd64 b898f210 7f00e000
> > 80400744 b8d46000 80b21634 80b21634
> > > > [   13.387809][  T415] 7d20: 80b2169c 80400614 80b21634 80400718
> > 7f00e000 00000000 b8d47d7c 80400744
> > > > [   13.396689][  T415] 7d40: b8d46000 80b21634 80b21634 803fe338
> > b898f254 b80fe76c b8d32e38 990a3ad4
> > > > [   13.405569][  T415] 7d60: fffffff3 b898f210 b8d46000 00000001 b898f254
> > 803ffe7c 80857a90 b898f210
> > > > [   13.414449][  T415] 7d80: 00000001 990a3ad4 b8d46000 b898f210
> > b898f210 80b17aec b8a29c20 803ff0a4
> > > > [   13.423328][  T415] 7da0: b898f210 00000000 b8d46000 803fb8e0
> > b898f200 00000000 80b17aec b898f210
> > > > [   13.432209][  T415] 7dc0: b8a29c20 990a3ad4 b895b900 b898f200
> > 8050fb7c 80b17aec b898f210 b8a29c20
> > > > [   13.441088][  T415] 7de0: b8a29800 b895b900 b8a29a04 803c5ec0
> > b8a29c00 b898f200 b8a29a20 00000007
> > > > [   13.449968][  T415] 7e00: b8a29c20 8050fd78 b8a29800 00000000
> > b8a29a20 b8a29c04 b8a29820 b8a299d0
> > > > [   13.458848][  T415] 7e20: b895b900 8050e5a4 b8a29800 b8a299d8
> > b8d46000 b8a299e0 b8a29820 b8a299d0
> > > > [   13.467728][  T415] 7e40: b895b900 8050e008 000041ed 00000000
> > b8b8c440 b8a299d8 b8a299e0 b8a299d8
> > > > [   13.476608][  T415] 7e60: b8b8c440 990a3ad4 00000000 b8a29820
> > b8b8c400 00000006 b8a29800 b895b880
> > > > [   13.485487][  T415] 7e80: b8d47f78 00000000 00000000 8050f4b4
> > 00000006 b895b890 b8b8c400 008fbea0
> > > > [   13.494367][  T415] 7ea0: b895b880 8029f530 00000000 00000000
> > b8d46000 00000006 b8d46000 008fbea0
> > > > [   13.503246][  T415] 7ec0: 8029f434 00000000 b8d46000 00000000
> > 00000000 8021e2e4 0000000a 8061fd0c
> > > > [   13.512125][  T415] 7ee0: 0000000a b8af0c00 0000000a b8af0c40
> > 00000001 b8af0c40 00000000 8061f910
> > > > [   13.521005][  T415] 7f00: 0000000a 80240af4 00000002 b8d46000
> > 00000000 8061fd0c 00000002 80232d7c
> > > > [   13.529884][  T415] 7f20: 00000000 b8d46000 00000000 990a3ad4
> > 00000000 00000006 b8a62d80 008fbea0
> > > > [   13.538764][  T415] 7f40: b8d47f78 00000000 b8d46000 00000000
> > 00000000 802210c0 b88f2900 00000000
> > > > [   13.547644][  T415] 7f60: b8a62d80 b8a62d80 b8d46000 00000006
> > 008fbea0 80221320 00000000 00000000
> > > > [   13.556524][  T415] 7f80: b8af0c00 990a3ad4 0000006c 008fbea0 76f1cda0
> > 00000004 80101204 00000004
> > > > [   13.565403][  T415] 7fa0: 00000000 80101000 0000006c 008fbea0
> > 00000001 008fbea0 00000006 00000000
> > > > [   13.574283][  T415] 7fc0: 0000006c 008fbea0 76f1cda0 00000004 00000006
> > 00000006 00000000 00000000
> > > > [   13.583162][  T415] 7fe0: 00000004 7ebaf7d0 76eb4c0b 76e3f206
> > 600d0030 00000001 00000000 00000000
> > > > [   13.592056][  T415] [<8050f6b0>] (rproc_virtio_notify) from
> > [<803c6430>] (virtqueue_notify+0x1c/0x34)
> > > > [   13.601298][  T415] [<803c6430>] (virtqueue_notify) from [<7f00ae18>]
> > (rpmsg_probe+0x280/0x380 [virtio_rpmsg_bus])
> > > > [   13.611663][  T415] [<7f00ae18>] (rpmsg_probe [virtio_rpmsg_bus])
> > from [<803c62e0>] (virtio_dev_probe+0x1f8/0x2c4)
> > > > [   13.622022][  T415] [<803c62e0>] (virtio_dev_probe) from [<80400114>]
> > (really_probe+0x200/0x450)
> > > > [   13.630817][  T415] [<80400114>] (really_probe) from [<80400614>]
> > (driver_probe_device+0x16c/0x1ac)
> > > > [   13.639873][  T415] [<80400614>] (driver_probe_device) from
> > [<803fe338>] (bus_for_each_drv+0x84/0xc8)
> > > > [   13.649102][  T415] [<803fe338>] (bus_for_each_drv) from [<803ffe7c>]
> > (__device_attach+0xd4/0x164)
> > > > [   13.658069][  T415] [<803ffe7c>] (__device_attach) from [<803ff0a4>]
> > (bus_probe_device+0x84/0x8c)
> > > > [   13.666950][  T415] [<803ff0a4>] (bus_probe_device) from
> > [<803fb8e0>] (device_add+0x444/0x768)
> > > > [   13.675572][  T415] [<803fb8e0>] (device_add) from [<803c5ec0>]
> > (register_virtio_device+0xa4/0xfc)
> > > > [   13.684541][  T415] [<803c5ec0>] (register_virtio_device) from
> > [<8050fd78>] (rproc_add_virtio_dev+0xcc/0x1b8)
> > > > [   13.694466][  T415] [<8050fd78>] (rproc_add_virtio_dev) from
> > [<8050e5a4>] (rproc_start+0x148/0x200)
> > > > [   13.703521][  T415] [<8050e5a4>] (rproc_start) from [<8050e008>]
> > (rproc_boot+0x384/0x5c0)
> > > > [   13.711708][  T415] [<8050e008>] (rproc_boot) from [<8050f4b4>]
> > (state_store+0x3c/0xc8)
> > > > [   13.719723][  T415] [<8050f4b4>] (state_store) from [<8029f530>]
> > (kernfs_fop_write+0xfc/0x214)
> > > > [   13.728348][  T415] [<8029f530>] (kernfs_fop_write) from [<8021e2e4>]
> > (__vfs_write+0x30/0x1cc)
> > > > [   13.736971][  T415] [<8021e2e4>] (__vfs_write) from [<802210c0>]
> > (vfs_write+0xac/0x17c)
> > > > [   13.744985][  T415] [<802210c0>] (vfs_write) from [<80221320>]
> > (ksys_write+0x64/0xe4)
> > > > [   13.752825][  T415] [<80221320>] (ksys_write) from [<80101000>]
> > (ret_fast_syscall+0x0/0x54)
> > > > [   13.761178][  T415] Exception stack(0xb8d47fa8 to 0xb8d47ff0)
> > > > [   13.766932][  T415] 7fa0:                   0000006c 008fbea0 00000001 008fbea0
> > 00000006 00000000
> > > > [   13.775811][  T415] 7fc0: 0000006c 008fbea0 76f1cda0 00000004 00000006
> > 00000006 00000000 00000000
> > > > [   13.784687][  T415] 7fe0: 00000004 7ebaf7d0 76eb4c0b 76e3f206
> > > > [   13.790442][  T415] Code: bad PC value
> > > > [   13.839214][  T415] ---[ end trace 1fe21ecfc9f28852 ]---
> > > >
> > > > Signed-off-by: Nikita Shubin <NShubin@topcon.com>
> > > > Fixes: 7a186941626d ("remoteproc: remove the single rpmsg vdev
> > > > limitation")
> > > > Cc: stable@vger.kernel.org
> > > > ---
> > > >  drivers/remoteproc/remoteproc_virtio.c | 7 +++++++
> > > >  1 file changed, 7 insertions(+)
> > > >
> > > > diff --git a/drivers/remoteproc/remoteproc_virtio.c
> > > > b/drivers/remoteproc/remoteproc_virtio.c
> > > > index 8c07cb2ca8ba..31a62a0b470e 100644
> > > > --- a/drivers/remoteproc/remoteproc_virtio.c
> > > > +++ b/drivers/remoteproc/remoteproc_virtio.c
> > > > @@ -334,6 +334,13 @@ int rproc_add_virtio_dev(struct rproc_vdev
> > *rvdev, int id)
> > > >  	struct rproc_mem_entry *mem;
> > > >  	int ret;
> > > >
> > > > +	if (rproc->ops->kick == NULL) {
> > > > +		ret = -EINVAL;
> > > > +		dev_err(dev, ".kick method not defined for %s",
> > > > +				rproc->name);
> > > > +		goto out;
> > > > +	}
> > > > +
> > > Should the kick ops be mandatory for all the platforms? How about making
> > it optional instead?
> > 
> > Hi, Arnaud.
> > 
> > It is not mandatory, currently it must be provided if specified vdev entry is in
> > resourse table. Otherwise it looks like there is no point in creating vdev.
> 
> Yes, my question was about having it optional for vdev also. A platform could implement the vdev
> without kick mechanism but by polling depending due to hardware capability...
> This could be an alternative avoiding to implement a dummy function in platform driver.
> 

Is this a real thing or a theoretical suggestion?

Regards,
Bjorn

> Anyway it just a proposal that makes sense from MPOV. If Bjorn is ok with your patch, nothing blocking on my side.
> 
> Regards
> Arnaud
> 
> > 
> > 
> > >
> > > Regards,
> > > Arnaud
> > >
> > > >  	/* Try to find dedicated vdev buffer carveout */
> > > >  	mem = rproc_find_carveout_by_name(rproc, "vdev%dbuffer",
> > rvdev->index);
> > > >  	if (mem) {
> > > >