Description
In the Linux kernel, the following vulnerability has been resolved: locking/csd_lock: Change csdlock_debug from early_param to __setup The csdlock_debug kernel-boot parameter is parsed by the early_param() function csdlock_debug(). If set, csdlock_debug() invokes static_branch_enable() to enable csd_lock_wait feature, which triggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and CONFIG_SPARSEMEM_VMEMMAP=n. With CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in static_key_enable() and returns NULL, resulting in a NULL dereference because mem_section is initialized only later in sparse_init(). This is also a problem for powerpc because early_param() functions are invoked earlier than jump_label_init(), also resulting in static_key_enable() failures. These failures cause the warning "static key 'xxx' used before call to jump_label_init()". Thus, early_param is too early for csd_lock_wait to run static_branch_enable(), so changes it to __setup to fix these.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 to < d2cbdbe22b5f190055d2d0ae92e7454479343a30affected8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 to < 05de9e2e33b1625c71aee69e353fe906dd2be88aaffected8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 to < b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0affected8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 to < 9c9b26b0df270d4f9246e483a44686fca951a29caffected
Linux Linux
Default version status: affected
5.13affected0 to < 5.13unaffected5.15.61 to ≤ 5.15.*unaffected5.18.18 to ≤ 5.18.*unaffected5.19.2 to ≤ 5.19.*unaffected6.0 to ≤ *unaffected