The patch titled
Subject: taint: add taint for randstruct
has been added to the -mm tree. Its filename is
taint-add-taint-for-randstruct.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/taint-add-taint-for-randstruct.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/taint-add-taint-for-randstruct.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: taint: add taint for randstruct
Since the randstruct plugin can intentionally produce extremely unusual
kernel structure layouts (even performance pathological ones), some
maintainers want to be able to trivially determine if an Oops is coming
from a randstruct-built kernel, so as to keep their sanity when debugging.
This adds the new flag and initializes taint_mask immediately when built
with randstruct.
Link: http://lkml.kernel.org/r/1518752264-47238-4-git-send-email-keescook@xxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/sysctl/kernel.txt | 1 +
include/linux/kernel.h | 1 +
kernel/panic.c | 4 +++-
3 files changed, 5 insertions(+), 1 deletion(-)
diff -puN Documentation/sysctl/kernel.txt~taint-add-taint-for-randstruct Documentation/sysctl/kernel.txt
--- a/Documentation/sysctl/kernel.txt~taint-add-taint-for-randstruct
+++ a/Documentation/sysctl/kernel.txt
@@ -991,6 +991,7 @@ ORed together. The letters are seen in "
16384 (L): A soft lockup has previously occurred on the system.
32768 (K): The kernel has been live patched.
65536 (X): Auxiliary taint, defined and used by for distros.
+131072 (T): The kernel was built with the struct randomization plugin.
==============================================================
diff -puN include/linux/kernel.h~taint-add-taint-for-randstruct include/linux/kernel.h
--- a/include/linux/kernel.h~taint-add-taint-for-randstruct
+++ a/include/linux/kernel.h
@@ -551,6 +551,7 @@ enum taint_enum {
TAINT_SOFTLOCKUP,
TAINT_LIVEPATCH,
TAINT_AUX,
+ TAINT_RANDSTRUCT,
/* End of taint bits */
TAINT_FLAGS_COUNT
diff -puN kernel/panic.c~taint-add-taint-for-randstruct kernel/panic.c
--- a/kernel/panic.c~taint-add-taint-for-randstruct
+++ a/kernel/panic.c
@@ -34,7 +34,8 @@
#define PANIC_BLINK_SPD 18
int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
-static unsigned long tainted_mask;
+static unsigned long tainted_mask =
+ IS_ENABLED(CONFIG_GCC_PLUGIN_RANDSTRUCT) ? (1 << TAINT_RANDSTRUCT) : 0;
static int pause_on_oops;
static int pause_on_oops_flag;
static DEFINE_SPINLOCK(pause_on_oops_lock);
@@ -325,6 +326,7 @@ const struct taint_flag taint_flags[TAIN
[ TAINT_SOFTLOCKUP ] = { 'L', ' ', false },
[ TAINT_LIVEPATCH ] = { 'K', ' ', true },
[ TAINT_AUX ] = { 'X', ' ', true },
+ [ TAINT_RANDSTRUCT ] = { 'T', ' ', true },
};
/**
_
Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are
taint-convert-to-enum-and-indexed-initialization.patch
taint-consolidate-documentation.patch
taint-add-taint-for-randstruct.patch
exec-pass-stack-rlimit-into-mm-layout-functions.patch
exec-introduce-finalize_exec-before-start_thread.patch
exec-pin-stack-limit-during-exec.patch
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