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Mark-PK Tsai 0603d82bca perf/hw_breakpoint: Fix arch_hw_breakpoint use-before-initialization 
commit 310aa0a25b upstream.

If we disable the compiler's auto-initialization feature, if
-fplugin-arg-structleak_plugin-byref or -ftrivial-auto-var-init=pattern
are disabled, arch_hw_breakpoint may be used before initialization after:

  9a4903dde2 ("perf/hw_breakpoint: Split attribute parse and commit")

On our ARM platform, the struct step_ctrl in arch_hw_breakpoint, which
used to be zero-initialized by kzalloc(), may be used in
arch_install_hw_breakpoint() without initialization.

Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alix Wu <alix.wu@mediatek.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: YJ Chiang <yj.chiang@mediatek.com>
Link: https://lkml.kernel.org/r/20190906060115.9460-1-mark-pk.tsai@mediatek.com
[ Minor edits. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Doug Anderson <dianders@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-17 13:45:44 -07:00
..
callchain.c treewide: convert ISO_8859-1 text comments to utf-8 2018-08-23 18:48:43 -07:00
core.c perf/core: Fix creating kernel counters for PMUs that override event->cpu 2019-08-16 10:12:50 +02:00
hw_breakpoint.c perf/hw_breakpoint: Fix arch_hw_breakpoint use-before-initialization 2019-10-17 13:45:44 -07:00
internal.h perf: Make perf_callchain function static 2018-01-08 12:33:01 -03:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ring_buffer.c perf/ring-buffer: Always use {READ,WRITE}_ONCE() for rb->user_page data 2019-06-22 08:15:16 +02:00
uprobes.c uprobes: Fix handle_swbp() vs. unregister() + register() race once more 2018-12-08 12:59:06 +01:00