CVE-2024-36007 Information

Description

In the Linux kernel the following vulnerability has been resolved:

mlxsw: spectrum_acl_tcam: Fix warning during rehash

As previously explained the rehash delayed work migrates filters from one region to another. This is done by iterating over all chunks (all the filters with the same priority) in the region and in each chunk iterating over all the filters.

When the work runs out of credits it stores the current chunk and entry as markers in the per-work context so that it would know where to resume the migration from the next time the work is scheduled.

Upon error the chunk marker is reset to NULL but without resetting the entry markers despite being relative to it. This can result in migration being resumed from an entry that does not belong to the chunk being migrated. In turn this will eventually lead to a chunk being iterated over as if it is an entry. Because of how the two structures happen to be defined this does not lead to KASAN splats but to warnings such as [1].

Fix by creating a helper that resets all the markers and call it from all the places the currently only reset the chunk marker. For good measures also call it when starting a completely new rehash. Add a warning to avoid future cases.

[1] WARNING: CPU: 7 PID: 1076 at drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c:407 mlxsw_afk_encode+0x242/0x2f0 Modules linked in: CPU: 7 PID: 1076 Comm: kworker/7:24 Tainted: G W 6.9.0-rc3-custom-00880-g29e61d91b77b 29 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_afk_encode+0x242/0x2f0 […] Call Trace: mlxsw_sp_acl_atcam_entry_add+0xd9/0x3c0 mlxsw_sp_acl_tcam_entry_create+0x5e/0xa0 mlxsw_sp_acl_tcam_vchunk_migrate_all+0x109/0x290 mlxsw_sp_acl_tcam_vregion_rehash_work+0x6c/0x470 process_one_work+0x151/0x370 worker_thread+0x2cb/0x3e0 kthread+0xd0/0x100 ret_from_fork+0x34/0x50

Reference

https://git.kernel.org/stable/c/0b88631855026b55cad901ac28d081e0f358e596 https://git.kernel.org/stable/c/1d76bd2a0034d0d08045c1c6adf2235d88982952 https://git.kernel.org/stable/c/039992b6d2df097c65f480dcf269de3d2656f573 https://git.kernel.org/stable/c/751d352858108314efd33dddd5a9a2b6bf7d6916 https://git.kernel.org/stable/c/e890456051fe8c57944b911defb3e6de91315861 https://git.kernel.org/stable/c/17e9e0bbae652b9b2049e51699e93dfa60b2988d https://git.kernel.org/stable/c/743edc8547a92b6192aa1f1b6bb78233fa21dc9b