CVE-2022-50012

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> powerpc/64: Init jump labels before parse_early_param()<br /> <br /> On 64-bit, calling jump_label_init() in setup_feature_keys() is too<br /> late because static keys may be used in subroutines of<br /> parse_early_param() which is again subroutine of early_init_devtree().<br /> <br /> For example booting with "threadirqs":<br /> <br /> static_key_enable_cpuslocked(): static key &amp;#39;0xc000000002953260&amp;#39; used before call to jump_label_init()<br /> WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:166 static_key_enable_cpuslocked+0xfc/0x120<br /> ...<br /> NIP static_key_enable_cpuslocked+0xfc/0x120<br /> LR static_key_enable_cpuslocked+0xf8/0x120<br /> Call Trace:<br /> static_key_enable_cpuslocked+0xf8/0x120 (unreliable)<br /> static_key_enable+0x30/0x50<br /> setup_forced_irqthreads+0x28/0x40<br /> do_early_param+0xa0/0x108<br /> parse_args+0x290/0x4e0<br /> parse_early_options+0x48/0x5c<br /> parse_early_param+0x58/0x84<br /> early_init_devtree+0xd4/0x518<br /> early_setup+0xb4/0x214<br /> <br /> So call jump_label_init() just before parse_early_param() in<br /> early_init_devtree().<br /> <br /> [mpe: Add call trace to change log and minor wording edits.]