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authorKees Cook <keescook@chromium.org>2018-04-11 02:32:33 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 20:28:35 +0300
commitbc4f2f5469ac2a52affadc4c00c1276d76151a39 (patch)
tree24799573464644e6d6878e82861a3524fb5ca992
parent9c4560e5bbd8c839c8986f79ef536aa07bd77ec7 (diff)
downloadlinux-bc4f2f5469ac2a52affadc4c00c1276d76151a39.tar.xz
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/1519084390-43867-4-git-send-email-keescook@chromium.org Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/sysctl/kernel.txt1
-rw-r--r--include/linux/kernel.h3
-rw-r--r--kernel/panic.c4
3 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 4a890c7fb6c3..eded671d55eb 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -991,6 +991,7 @@ ORed together. The letters are seen in "Tainted" line of Oops reports.
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 --git a/include/linux/kernel.h b/include/linux/kernel.h
index 086e8e80f765..6a1eb0b0aad9 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -562,7 +562,8 @@ extern enum system_states {
#define TAINT_SOFTLOCKUP 14
#define TAINT_LIVEPATCH 15
#define TAINT_AUX 16
-#define TAINT_FLAGS_COUNT 17
+#define TAINT_RANDSTRUCT 17
+#define TAINT_FLAGS_COUNT 18
struct taint_flag {
char c_true; /* character printed when tainted */
diff --git a/kernel/panic.c b/kernel/panic.c
index 5ceb9cbec4a2..42e487488554 100644
--- a/kernel/panic.c
+++ b/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[TAINT_FLAGS_COUNT] = {
[ TAINT_SOFTLOCKUP ] = { 'L', ' ', false },
[ TAINT_LIVEPATCH ] = { 'K', ' ', true },
[ TAINT_AUX ] = { 'X', ' ', true },
+ [ TAINT_RANDSTRUCT ] = { 'T', ' ', true },
};
/**