Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:firmware: arm_ffa: Fix FFA device names for logical partitionsEach physical partition can provide multiple services each with UUID.Each such service can be presented as logical partition with a uniquecombination of VM ID and UUID. The number of distinct UUID in a systemwill be less than or equal to the number of logical partitions.However, currently it fails to register more than one logical partitionor service within a physical partition as the device name contains onlyVM ID while both VM ID and UUID are maintained in the partition information.The kernel complains with the below message: | sysfs: cannot create duplicate filename '/devices/arm-ffa-8001' | CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.3.0-rc7 #8 | Hardware name: FVP Base RevC (DT) | Call trace: | dump_backtrace+0xf8/0x118 | show_stack+0x18/0x24 | dump_stack_lvl+0x50/0x68 | dump_stack+0x18/0x24 | sysfs_create_dir_ns+0xe0/0x13c | kobject_add_internal+0x220/0x3d4 | kobject_add+0x94/0x100 | device_add+0x144/0x5d8 | device_register+0x20/0x30 | ffa_device_register+0x88/0xd8 | ffa_setup_partitions+0x108/0x1b8 | ffa_init+0x2ec/0x3a4 | do_one_initcall+0xcc/0x240 | do_initcall_level+0x8c/0xac | do_initcalls+0x54/0x94 | do_basic_setup+0x1c/0x28 | kernel_init_freeable+0x100/0x16c | kernel_init+0x20/0x1a0 | ret_from_fork+0x10/0x20 | kobject_add_internal failed for arm-ffa-8001 with -EEXIST, don't try to | register things with the same name in the same directory. | arm_ffa arm-ffa: unable to register device arm-ffa-8001 err=-17 | ARM FF-A: ffa_setup_partitions: failed to register partition ID 0x8001By virtue of being random enough to avoid collisions when generated in adistributed system, there is no way to compress UUID keys to the numberof bits required to identify each. We can eliminate '-' in the name butit is not worth eliminating 4 bytes and add unnecessary logic for doingthat. Also v1.0 doesn't provide the UUID of the partitions which makesit hard to use the same for the device name.So to keep it simple, let us alloc an ID using ida_alloc() and append thesame to "arm-ffa" to make up a unique device name. Also stash the id valuein ffa_dev to help freeing the ID later when the device is destroyed.
No PoCs from references.
- https://github.com/fkie-cad/nvd-json-data-feeds