| From: Josh Poimboeuf <jpoimboe@kernel.org> |
| Subject: kasan: disable stackleak plugin in report code |
| Date: Tue, 11 Oct 2022 12:05:48 -0700 |
| |
| kasan_report() has a uaccess critical section which can't have any |
| instrumentation calls in the middle. Disable the stackleak plugin for the |
| report code. |
| |
| Fixes the following warning: |
| |
| vmlinux.o: warning: objtool: kasan_report+0x12: call to stackleak_track_stack() with UACCESS enabled |
| |
| Link: https://lkml.kernel.org/r/20221011190548.blixlqj6dripitaf@treble |
| Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> |
| Reported-by: Linus Torvalds <torvalds@linux-foundation.org> |
| Cc: Alexander Potapenko <glider@google.com> |
| Cc: Andrey Konovalov <andreyknvl@google.com> |
| Cc: Peter Zijlstra <peterz@infradead.org> |
| Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
| --- |
| |
| mm/kasan/Makefile | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/mm/kasan/Makefile~kasan-disable-stackleak-plugin-in-report-code |
| +++ a/mm/kasan/Makefile |
| @@ -27,7 +27,7 @@ CFLAGS_common.o := $(CC_FLAGS_KASAN_RUNT |
| CFLAGS_generic.o := $(CC_FLAGS_KASAN_RUNTIME) |
| CFLAGS_init.o := $(CC_FLAGS_KASAN_RUNTIME) |
| CFLAGS_quarantine.o := $(CC_FLAGS_KASAN_RUNTIME) |
| -CFLAGS_report.o := $(CC_FLAGS_KASAN_RUNTIME) |
| +CFLAGS_report.o := $(CC_FLAGS_KASAN_RUNTIME) $(DISABLE_STACKLEAK_PLUGIN) |
| CFLAGS_report_generic.o := $(CC_FLAGS_KASAN_RUNTIME) |
| CFLAGS_report_hw_tags.o := $(CC_FLAGS_KASAN_RUNTIME) |
| CFLAGS_report_sw_tags.o := $(CC_FLAGS_KASAN_RUNTIME) |
| _ |
