linux-kernel - [PATCH 4.14 001/167] tracing: Prevent PROFILE_ALL_BRANCHES when FORTIFY

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Message-Id: <20180221124524.709899387@linuxfoundation.org>
Date:   Wed, 21 Feb 2018 13:46:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 4.14 001/167] tracing: Prevent PROFILE_ALL_BRANCHES when FORTIFY_SOURCE=y

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Randy Dunlap <rdunlap@...radead.org>

commit 68e76e034b6b1c1ce2eece1ab8ae4008e14be470 upstream.

I regularly get 50 MB - 60 MB files during kernel randconfig builds.
These large files mostly contain (many repeats of; e.g., 124,594):

In file included from ../include/linux/string.h:6:0,
                 from ../include/linux/uuid.h:20,
                 from ../include/linux/mod_devicetable.h:13,
                 from ../scripts/mod/devicetable-offsets.c:3:
../include/linux/compiler.h:64:4: warning: '______f' is static but declared in inline function 'strcpy' which is not static [enabled by default]
    ______f = {     \
    ^
../include/linux/compiler.h:56:23: note: in expansion of macro '__trace_if'
                       ^
../include/linux/string.h:425:2: note: in expansion of macro 'if'
  if (p_size == (size_t)-1 && q_size == (size_t)-1)
  ^

This only happens when CONFIG_FORTIFY_SOURCE=y and
CONFIG_PROFILE_ALL_BRANCHES=y, so prevent PROFILE_ALL_BRANCHES if
FORTIFY_SOURCE=y.

Link: http://lkml.kernel.org/r/9199446b-a141-c0c3-9678-a3f9107f2750@infradead.org

Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/trace/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -343,7 +343,7 @@ config PROFILE_ANNOTATED_BRANCHES
 	  on if you need to profile the system's use of these macros.
 
 config PROFILE_ALL_BRANCHES
-	bool "Profile all if conditionals"
+	bool "Profile all if conditionals" if !FORTIFY_SOURCE
 	select TRACE_BRANCH_PROFILING
 	help
 	  This tracer profiles all branch conditions. Every if ()