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Message-Id: <1541887530-16610-1-git-send-email-alex.popov@linux.com> Date: Sun, 11 Nov 2018 01:05:30 +0300 From: Alexander Popov <alex.popov@...ux.com> To: kernel-hardening@...ts.openwall.com, Kees Cook <keescook@...omium.org>, Jann Horn <jannh@...gle.com>, Ingo Molnar <mingo@...nel.org>, Andy Lutomirski <luto@...nel.org>, Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>, Dave Hansen <dave.hansen@...ux.intel.com>, Steven Rostedt <rostedt@...dmis.org>, Peter Zijlstra <peterz@...radead.org>, Jan Kara <jack@...e.cz>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Dan Williams <dan.j.williams@...el.com>, Masahiro Yamada <yamada.masahiro@...ionext.com>, Masami Hiramatsu <mhiramat@...nel.org>, x86@...nel.org, alex.popov@...ux.com, linux-kernel@...r.kernel.org Subject: [PATCH 1/1] stackleak: Disable ftrace for stackleak.c 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@...el.com> Signed-off-by: Alexander Popov <alex.popov@...ux.com> Reviewed-by: Kees Cook <keescook@...omium.org> --- 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
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