[PATCH 1/1] stackleak: Disable ftrace for stackleak.c
From: Alexander Popov
Date: Sat Nov 10 2018 - 17:05:50 EST
The stackleak_erase() function is called on the trampoline stack at the
end of syscall. This stack is not big enough for ftrace operations,
e.g. it can be overflowed if we enable kprobe_events for stackleak_erase().
Let's disable ftrace for stackleak.c to avoid such situations.
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Alexander Popov <alex.popov@xxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
kernel/Makefile | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/Makefile b/kernel/Makefile
index 7343b3a..0906f6d 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_MULTIUSER) += groups.o
ifdef CONFIG_FUNCTION_TRACER
# Do not trace internal ftrace files
CFLAGS_REMOVE_irq_work.o = $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_stackleak.o = $(CC_FLAGS_FTRACE)
endif
# Prevents flicker of uninteresting __do_softirq()/__local_bh_disable_ip()
--
2.7.4