CVE-2024-43846 Information

Description

In the Linux kernel the following vulnerability has been resolved:

lib: objagg: Fix general protection fault

The library supports aggregation of objects into other objects only if the parent object does not have a parent itself. That is nesting is not supported.

Aggregation happens in two cases: Without and with hints where hints are a pre-computed recommendation on how to aggregate the provided objects.

Nesting is not possible in the first case due to a check that prevents it but in the second case there is no check because the assumption is that nesting cannot happen when creating objects based on hints. The violation of this assumption leads to various warnings and eventually to a general protection fault [1].

Before fixing the root cause error out when nesting happens and warn.

[1] general protection fault probably for non-canonical address 0xdead000000000d90: 0000 [1] PREEMPT SMP PTI CPU: 1 PID: 1083 Comm: kworker/1:9 Tainted: G W 6.9.0-rc6-custom-gd9b4f1cca7fb 7 Hardware name: Mellanox Technologies Ltd. MSN3700/VMOD0005 BIOS 5.11 01/06/2019 Workqueue: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work RIP: 0010:mlxsw_sp_acl_erp_bf_insert+0x25/0x80 […] Call Trace: mlxsw_sp_acl_atcam_entry_add+0x256/0x3c0 mlxsw_sp_acl_tcam_entry_create+0x5e/0xa0 mlxsw_sp_acl_tcam_vchunk_migrate_one+0x16b/0x270 mlxsw_sp_acl_tcam_vregion_rehash_work+0xbe/0x510 process_one_work+0x151/0x370 worker_thread+0x2cb/0x3e0 kthread+0xd0/0x100 ret_from_fork+0x34/0x50 ret_from_fork_asm+0x1a/0x30

Reference

https://git.kernel.org/stable/c/5adc61d29bbb461d7f7c2b48dceaa90ecd182eb7 https://git.kernel.org/stable/c/1936fa05a180834c3b52e0439a6bddc07814d3eb https://git.kernel.org/stable/c/499f742fed42e74f1321f4b12ca196a66a2b49fc https://git.kernel.org/stable/c/b4a3a89fffcdf09702b1f161b914e52abca1894d