CVE-2021-47006

In the Linux kernel, the following vulnerability has been resolved: ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook The commit 1879445dfa7b ("perf/core: Set event's default ::overflow_handler()") set a default event->overflow_handler in perf_event_alloc(), and replace the check event->overflow_handler with is_default_overflow_handler(), but one is missing. Currently, the bp->overflow_handler can not be NULL. As a result, enable_single_step() is always not invoked. Comments from Zhen Lei: https://patchwork.kernel.org/project/linux-arm-kernel/patch/[email protected]/

• linux linux kernel (>= 4.7 < 4.9.269) • linux linux kernel (>= 4.10 < 4.14.233) • linux linux kernel (>= 4.15 < 4.19.191) • linux linux kernel (>= 4.20 < 5.4.120) • linux linux kernel (>= 5.5 < 5.10.38) • linux linux kernel (>= 5.11 < 5.11.22) • linux linux kernel (>= 5.12 < 5.12.5)