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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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