The patch titled
Subject: latent_entropy: raise CONFIG_FRAME_WARN by default
has been added to the -mm tree. Its filename is
latent_entropy-raise-config_frame_warn-by-default.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/latent_entropy-raise-config_frame_warn-by-default.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/latent_entropy-raise-config_frame_warn-by-default.patch
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------------------------------------------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: latent_entropy: raise CONFIG_FRAME_WARN by default
When building with the latent_entropy plugin, set the default
CONFIG_FRAME_WARN to 2048, since some __init functions have many basic
blocks that, when instrumented by the latent_entropy plugin, grow beyond
1024 byte stack size on 32-bit builds.
Link: http://lkml.kernel.org/r/20161018211216.GA39687@beast
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Cc: Emese Revfy <re.emese@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Michal Marek <mmarek@xxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.debug | 1 +
1 file changed, 1 insertion(+)
diff -puN lib/Kconfig.debug~latent_entropy-raise-config_frame_warn-by-default lib/Kconfig.debug
--- a/lib/Kconfig.debug~latent_entropy-raise-config_frame_warn-by-default
+++ a/lib/Kconfig.debug
@@ -198,6 +198,7 @@ config FRAME_WARN
int "Warn for stack frames larger than (needs gcc 4.4)"
range 0 8192
default 0 if KASAN
+ default 2048 if GCC_PLUGIN_LATENT_ENTROPY
default 1024 if !64BIT
default 2048 if 64BIT
help
_
Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are
latent_entropy-raise-config_frame_warn-by-default.patch
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