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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?y7M7SgER1XASm0zxuTSkIWivtHYgVBx7g+edT2Qewco3UcL6eYfUcALJlPeW?= =?us-ascii?Q?D2NKDPrGB+z4DjKyjBIcX/KM80FHdoiC/Z6Ye0X5s3d9qPjtmWiebCj4+0b/?= =?us-ascii?Q?uPfUt+Qbk+t09lv/BBzqqHVR7mL06lmqILJuJQI5XqyBljA/6uAwdRrUYlqO?= =?us-ascii?Q?MMhsB17VGXcGWx21itR0hdGt2keCmmQBwPM1FDV1e4Igjm0VqDYksmvKrGbX?= =?us-ascii?Q?SvoeUhXUb79SW1v5+aNwYn1vZvhT7gHxeI/WKIiM6gH7++57t67uevvhtiCC?= =?us-ascii?Q?uAjmynaLjuLeDACW0WIxW31bWPfl2eV1lgjsWpnalfANzWQju+026oKFaYpy?= =?us-ascii?Q?cdayKCp6y4i/ye1PnFmH4B5Xlhkwxh3G8mpQdKQ9njBB1vc4YBYE1RFPhCgv?= =?us-ascii?Q?L2NwuZ1aOYIdw7948Mnm1vZJ/w2B95ansmLJ2YuT/cg0gKssfIfWEIwpwfBA?= =?us-ascii?Q?eUXVmEtPTatewG5kcE8/YPLebn6/k4YnvON7Lqjxm6YLogW95MMX30L/eebl?= =?us-ascii?Q?ojGP5AkpbSWBwameJ0fjJxc5YckA3b0AHZiNSIIh1IwjmCtUB4yDrJlMbtLR?= =?us-ascii?Q?hCqnohceuVpLbQUs4CS9TEcmj4IbWpdUW59Wy/pDM+iNB0a0Rzexru+hMKRS?= =?us-ascii?Q?OzYk22wpkZ1BZGWcEyOF1QZQpUmHU2Iff9Ho0I/rj0xKAdoPOi4dNbXbwT3L?= =?us-ascii?Q?rmNrQP2TfYrgfrXuYLwBJ2SXNJwHYaEybF7GpNl9fvMfNLR/j95MPw3kVmox?= =?us-ascii?Q?J4WkFPoF1UWUg5pEGHC8XfvF4lM45BROAKWsXiduV/BPyVxxCQ/AGbrhXe97?= =?us-ascii?Q?A3SbwSjXKmHqq0CrNt/Ufwanjnpr7ziOhlw8X+2x/3vQMhlgyRGcYzX/8t5j?= =?us-ascii?Q?sk1yfQWW4nMZY54oZMDZngHfK45f0hH4jVH9YghEBLFnGDDnwEPKzc8KVM4u?= =?us-ascii?Q?LA3TujFzCGuM57XaRFhF+RpZNCWJ6S8UR0CtRFoATiWAWiuoXRPYGhNiNoI7?= =?us-ascii?Q?ZPhBk7GCLOIKoG28nUzvZ6IK0xOugD0xXVVKjQ4BHrYTF88yesRYW3PyoyAM?= =?us-ascii?Q?1Qf34eRGUbjzHkD+Q+9TrAqobvRXVI+FsWJepMVJ+to0oWrpdRobwgyD7PV6?= =?us-ascii?Q?huFaMbfaWaYi78KwfM3VQ73DOsYuxao6EZg3mFFJMNadexH+9rvRnsIiciWk?= =?us-ascii?Q?m29yMieHn09l1ilMQjDDcwpgl8YB8vf+LqL1iLcuJawHeFC7ZfQKNEzOAzLm?= =?us-ascii?Q?RutgcDdhuulgWX8TcuQuH53Nk5/TUReRKJEX9HJjieq+dDfURi3D3S6WnZlG?= =?us-ascii?Q?geNkD7RFFyg7erXNYmdayJLNE1eoWnUIPCQHAv9j1o6AfkCGZH/4bIPfUCHb?= =?us-ascii?Q?m9Ib5ebsO44jbt4cyoHLwJooA9fmQI3IytFrru1RlKn2stNgGIX9zQFmnG16?= =?us-ascii?Q?JhKxZ+GfvDBMKh5VjdBEzJV6zxVgONKIi4W6IUihwSVtQXRGKm+bYU7Kptr+?= =?us-ascii?Q?o1IraNxMK0y1VLSH56uxi+8hLg+6riqK7RrVNEhjQqv2tb6mYRlrfak5X3VG?= =?us-ascii?Q?sO9SbMWlo0cyf3WHjcEJY9Q8LuUx7wnP5HfdZ7fbNN5jY4W74DsClqn4QQoC?= =?us-ascii?Q?tA=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: c4695d3c-5fcf-4c70-edef-08db2b16df29 X-MS-Exchange-CrossTenant-AuthSource: MN0PR11MB6059.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Mar 2023 20:49:03.9692 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: d065ya582aKq/dlSP9a+3CikViQWkpu6ivGz/u8Z2A4XOTm6b4M7pQdCENcgZmeAE+wjj+KuHJ9kDiFRHSKukw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR11MB5944 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Sun, Mar 12, 2023 at 04:56:23PM -0300, Alexandre Oliva wrote: > > If two or more suitable entries with the same filename are found in > __uc_fw_auto_select's fw_blobs, and that filename fails to load in the > first attempt and in the retry, when __uc_fw_auto_select is called for > the third time, the coincidence of strings will cause it to clear > file_selected.path at the first hit, so it will return the second hit > over and over again, indefinitely. > > Of course this doesn't occur with the pristine blob lists, but a > modified version could run into this, e.g., patching in a duplicate > entry, or (as in our case) disarming blob loading by remapping their > names to "/*(DEBLOBBED)*/", given a toolchain that unifies identical > string literals. > > Of course I'm ready to carry a patchlet to avoid this problem > triggered by our (GNU Linux-libre's) intentional changes, but I > figured you might be interested in fail-safing it even in accidental > backporting circumstances. I realize it's not entirely foolproof: if > the same string appears in two entries separated by a different one, > the infinite loop might still occur. Catching that even more unlikely > situation seemed too expensive. > > Link: https://www.fsfla.org/pipermail/linux-libre/2023-March/003506.html > Cc: intel-gfx@lists.freedesktop.org > Cc: stable@vger.kernel.org # 6.[12].x > Signed-off-by: Alexandre Oliva Cc: Daniele Ceraolo Spurio Cc: John Harrison > --- > drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c > index 9d6f571097e6..2b7564a3ed82 100644 > --- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c > +++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c > @@ -259,7 +259,10 @@ __uc_fw_auto_select(struct drm_i915_private *i915, struct intel_uc_fw *uc_fw) Since __uc_fw_auto_select is also called from another place, intel_uc_fw_init_early out of the intel_uc_fw_fetch infinite loop, I'm afraid this proposal below could have some side-effect. I hope Daniele and John have a better understanding and can provide some guidance or acks here. > uc_fw->file_selected.path = NULL; > > continue; > - } > + } else if (uc_fw->file_wanted.path == blob->path) > + /* Avoid retrying forever when neighbor > + entries point to the same path. */ > + continue; > > uc_fw->file_selected.path = blob->path; > uc_fw->file_wanted.path = blob->path; > -- > 2.25.1 > > > -- > Alexandre Oliva, happy hacker https://FSFLA.org/blogs/lxo/ > Free Software Activist GNU Toolchain Engineer > Disinformation flourishes because many people care deeply about injustice > but very few check the facts. Ask me about