cve-2024-27005
Vulnerability from cvelistv5
Published
2024-05-01 05:28
Modified
2024-12-19 08:52
Severity ?
6.3 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: interconnect: Don't access req_list while it's being manipulated The icc_lock mutex was split into separate icc_lock and icc_bw_lock mutexes in [1] to avoid lockdep splats. However, this didn't adequately protect access to icc_node::req_list. The icc_set_bw() function will eventually iterate over req_list while only holding icc_bw_lock, but req_list can be modified while only holding icc_lock. This causes races between icc_set_bw(), of_icc_get(), and icc_put(). Example A: CPU0 CPU1 ---- ---- icc_set_bw(path_a) mutex_lock(&icc_bw_lock); icc_put(path_b) mutex_lock(&icc_lock); aggregate_requests() hlist_for_each_entry(r, ... hlist_del(... <r = invalid pointer> Example B: CPU0 CPU1 ---- ---- icc_set_bw(path_a) mutex_lock(&icc_bw_lock); path_b = of_icc_get() of_icc_get_by_index() mutex_lock(&icc_lock); path_find() path_init() aggregate_requests() hlist_for_each_entry(r, ... hlist_add_head(... <r = invalid pointer> Fix this by ensuring icc_bw_lock is always held before manipulating icc_node::req_list. The additional places icc_bw_lock is held don't perform any memory allocations, so we should still be safe from the original lockdep splats that motivated the separate locks. [1] commit af42269c3523 ("interconnect: Fix locking for runpm vs reclaim")
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c65507121ea8e0b47fae6d2049c8688390d46b6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0d04efa2e367921654b5106cc5c05e3757c2b42
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de1bf25b6d771abdb52d43546cf57ad775fb68a1
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4c65507121ea8e0b47fae6d2049c8688390d46b6
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d0d04efa2e367921654b5106cc5c05e3757c2b42
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/de1bf25b6d771abdb52d43546cf57ad775fb68a1
Impacted products
Vendor Product Version
Linux Linux Version: af42269c3523492d71ebbe11fefae2653e9cdc78
Version: af42269c3523492d71ebbe11fefae2653e9cdc78
Version: af42269c3523492d71ebbe11fefae2653e9cdc78
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   Linux Linux Version: 6.6
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