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Miller" , Jakub Kicinski , Alexandre Belloni , Andrew Lunn , Ariel Elior , Bin Luo , Claudiu Manoil , Coiby Xu , Derek Chickles , drivers@pensando.io, Felix Manlunas , Florian Fainelli , Geetha sowjanya , Greg Kroah-Hartman , GR-everest-linux-l2@marvell.com, GR-Linux-NIC-Dev@marvell.com, hariprasad , Ido Schimmel , Intel Corporation , intel-wired-lan@lists.osuosl.org, Ioana Ciornei , Jerin Jacob , Jesse Brandeburg , Jiri Pirko , Jonathan Lemon , Linu Cherian , linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-rdma@vger.kernel.org, linux-staging@lists.linux.dev, Loic Poulain , Manish Chopra , M Chetan Kumar , Michael Chan , Michael Guralnik , netdev@vger.kernel.org, oss-drivers@corigine.com, Richard Cochran , Saeed Mahameed , Satanand Burla , Sergey Ryazanov , Shannon Nelson , Subbaraya Sundeep , Sunil Goutham , Taras Chornyi , Tariq Toukan , Tony Nguyen , UNGLinuxDriver@microchip.com, Vadym Kochan , Vivien Didelot , Vladimir Oltean Subject: Re: [PATCH net-next v1 13/21] nfp: Move delink_register to be last command Message-ID: <20210927122041.GA12315@corigine.com> References: <20210927083923.GC17484@corigine.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Kb8KYVmr60hFAzEw/zQxnfcvfo/BbO44vGlVApIexPmrejJow74QdWPGq5j6?= =?us-ascii?Q?t7E6+WkkQkLBT/Ow6yppzAI1AvEFJKjvwcfhFCZHYA43si464RQJOTgsWFa7?= =?us-ascii?Q?yTTmTQ6YRtH9f8Z43+D8k2HGQLaiIJ1hBJH5H6fu1jzJUegQT6+0/FkBYgvm?= =?us-ascii?Q?imnvPixke9sWAFfFLPzpI13I5HUFTJLSNAGL4UxYGHbXqfr+X0b6t5krxqLm?= =?us-ascii?Q?0WOPNg7nMRQhbWF0WsnTaYHAHpfXxsa3lo6cfN2zJErBF2yom/y++z3Dj89Q?= =?us-ascii?Q?f2nUBbkOVffqA6JdGS+yzeEZLhP8zaUrZBg5DEPhjmnp950OZXiJCC05EBjV?= =?us-ascii?Q?l3vjergtfFhZuJ+i1KyMwOVWOPuhNY1KaJuVYOCAJ3WznZeA/KUeQimjzLT3?= =?us-ascii?Q?o8kQopFLoq66OauErVSqiPhGtGMlEe1/+lgZfnzJGSgvkbn4n+ms2jSZFQbg?= =?us-ascii?Q?yRTbu+8dWoWoJCvRVeK9PaqHph1cxBP4BLzJD9UWVhF5Q0dgU1fs9SM9FjcN?= =?us-ascii?Q?/AIOUSgR+0yTLcYUbM7uOyJPTZDS1G6daGDNZEn6KSItEzLfj5PR/2ivuRIU?= =?us-ascii?Q?zhfKqz5EyqpE5FJgM5+XDHUkUhijZG791zAP53LaPKWpYnmGhDtHbPEK4+Qt?= =?us-ascii?Q?sh6R/O4sAb1IP0b27UPV1D9ujoZ42nB2MevfD6ch4PPypS6T25NnpdTlxPnf?= =?us-ascii?Q?/Zw6PLJuFJtss53lGQni4qei/IZqMitx4uJlPJo1O6S4lrMBDy7e+NVdtxWd?= =?us-ascii?Q?NVfAtV7Yi9o73FBrj4b063WhH62cKnLh+R4lb/6X1M7r8f2tGbsLwyrfn+9S?= =?us-ascii?Q?5//XOz0AhqUhlrdKthlcfCcUvQgEIlTgGXtFfXNQORGBQYlZwwFl94etEH6O?= =?us-ascii?Q?978soaVbYMhiZp5pDOyPFvyIZzz6Px2KSSeWaLoeelIUDdXeiIqsl2UTnGio?= =?us-ascii?Q?/sza7X5Z+FxwBVpWZHRRj4y5dnbqS1fvwnLa7ZiMDN91PE+8CpT3ThR2UOC+?= =?us-ascii?Q?ByQ6tGernrWRdsQzTWG6KWGG1ZpmFntnGvYJLNkv2cOwzoWCN9mpBmuo0jOl?= =?us-ascii?Q?ahvkPQ9xooFTznbLr/dF2nrrJMJ6NUiz+/VKRXibtR+6++ptV5nJxLD4hGXh?= =?us-ascii?Q?l/UkZmV7KEIq44yIKgyy87GDu34uEfzhyT+KDY2P2vjpx2Cvgs+fC4tr7Kd1?= =?us-ascii?Q?oscQ5ngLlOAdZ/V6L1E3GDJHz/n/djNyP25RDro8u30JTq8BoMjNffBYuLUL?= =?us-ascii?Q?KXXAqb7I3rRdLBfobZxXPWwhydj/0UL3opR+pH01RFMSENL7A2uDNOpk3MJv?= =?us-ascii?Q?fiffuQJD3vI2p23pH7uAlZFDrTtGIVWbSV0FUDiNhvKBs3zJ4WPnZeSVjTBn?= =?us-ascii?Q?M8axTsHD5p0zMYx4ArMdApz15Psj?= X-OriginatorOrg: corigine.com X-MS-Exchange-CrossTenant-Network-Message-Id: 39345651-ba2b-40b2-854f-08d981b1410f X-MS-Exchange-CrossTenant-AuthSource: PH0PR13MB4842.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Sep 2021 12:20:55.2825 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: fe128f2c-073b-4c20-818e-7246a585940c X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Ul8ACsjmDCk49ktQ7Hl6PGtdQB2D0mmJBNzYOWn2DsR/jppM/pMUyhwtazg/GprcUE/tgSzpEKfCaGN1QJRL+8v+pXlUSvv49Y1ja2K7WsY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR13MB4777 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 27, 2021 at 02:53:24PM +0300, Leon Romanovsky wrote: > On Mon, Sep 27, 2021 at 10:39:24AM +0200, Simon Horman wrote: > > On Sat, Sep 25, 2021 at 02:22:53PM +0300, Leon Romanovsky wrote: > > > From: Leon Romanovsky > > > > > > Open user space access to the devlink after driver is probed. > > > > Hi Leon, > > > > I think a description of why is warranted here. > > After devlink_register(), users can send GET and SET netlink commands to > the uninitialized driver. In some cases, nothing will happen, but not in > all and hard to prove that ALL drivers are safe with such early access. > > It means that local users can (in theory for some and in practice for > others) crash the system (or leverage permissions) with early devlink_register() > by accessing internal to driver pointers that are not set yet. > > Like I said in the commit message, I'm not fixing all drivers. > https://lore.kernel.org/netdev/cover.1632565508.git.leonro@nvidia.com/T/#m063eb4e67389bafcc3b3ddc07197bf43181b7209 > > Because some of the driver authors made a wonderful job to obfuscate their > driver and write completely unmanageable code. > > I do move devlink_register() to be last devlink command for all drivers, > to allow me to clean devlink core locking and API in next series. > > This series should raise your eyebrow and trigger a question: "is my > driver vulnerable too?". And the answer will depend on devlink_register() > position in the .probe() call. > > Thanks Thanks for the explanation. And thanks for taking time to update the NFP driver. > > > Signed-off-by: Leon Romanovsky Acked-by: Simon Horman