title: ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook
description: 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/20210207105934.2001-1-thunder.leizhen@huawei.com/
affected:
{
product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 1879445dfa7b, lessThan: 555a70f7fff0, status: affected, versionType: git
version: 1879445dfa7b, lessThan: ed1f67465327, status: affected, versionType: git
version: 1879445dfa7b, lessThan: a9938d6d78a2, status: affected, versionType: git
version: 1879445dfa7b, lessThan: 3ed8832aeaa9, status: affected, versionType: git
version: 1879445dfa7b, lessThan: 630146203108, status: affected, versionType: git
version: 1879445dfa7b, lessThan: 7eeacc6728c5, status: affected, versionType: git
version: 1879445dfa7b, lessThan: dabe299425b1, status: affected, versionType: git
version: 1879445dfa7b, lessThan: a506bd575629, status: affected, versionType: git
}
{
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 4.7, status: affected
version: 0, lessThan: 4.7, status: unaffected, versionType: custom
version: 4.9.269, lessThanOrEqual: 4.9.*, status: unaffected, versionType: custom
version: 4.14.233, lessThanOrEqual: 4.14.*, status: unaffected, versionType: custom
version: 4.19.191, lessThanOrEqual: 4.19.*, status: unaffected, versionType: custom
version: 5.4.120, lessThanOrEqual: 5.4.*, status: unaffected, versionType: custom
version: 5.10.38, lessThanOrEqual: 5.10.*, status: unaffected, versionType: custom
version: 5.11.22, lessThanOrEqual: 5.11.*, status: unaffected, versionType: custom
version: 5.12.5, lessThanOrEqual: 5.12.*, status: unaffected, versionType: custom
version: 5.13, lessThanOrEqual: *, status: unaffected, versionType: original_commit_for_fix
}
