Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: tick/nohz: unexport __init-annotated tick_nohz_full_setup() EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic. modpost used to detect it, but it had been broken for a decade. Commit 28438794aba4 ("modpost: fix section mismatch check for exported init/exit sections") fixed it so modpost started to warn it again, then this showed up: MODPOST vmlinux.symvers WARNING: modpost: vmlinux.o(___ksymtab_gpl+tick_nohz_full_setup+0x0): Section mismatch in reference from the variable __ksymtab_tick_nohz_full_setup to the function .init.text:tick_nohz_full_setup() The symbol tick_nohz_full_setup is exported and annotated __init Fix this by removing the __init annotation of tick_nohz_full_setup or drop the export. Drop the export because tick_nohz_full_setup() is only called from the built-in code in kernel/sched/isolation.c.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 before c4ff3ffe0138234774602152fe67e3a898c615c6; affected ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 before f4a80ec8c51d68be4b7a7830c510f75080c5e417; affected ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 before ea32b27e2f8c58c92bff5ecba7fcf64b97707089; affected ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 before 2390095113e98fc52fffe35c5206d30d9efe3f78 |
| Linux / Linux | affected 5.5; unaffected 0 before 5.5; unaffected 5.10.128 through 5.10.*; unaffected 5.15.52 through 5.15.*; unaffected 5.18.9 through 5.18.*; unaffected 5.19 through * |
CWE
No CWE identifiers supplied.