summaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
authorAndi Kleen <ak@linux.intel.com>2018-01-16 12:52:28 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-23 19:50:15 +0100
commit1782af2835fe6fbff6265a53fb85847fb9c58137 (patch)
tree43cbe1dc731d7c1621baa1af02772997b0240acb /include
parentfba063e6dfb413e06b9daa5d45b164761172f5ed (diff)
module: Add retpoline tag to VERMAGIC
commit 6cfb521ac0d5b97470883ff9b7facae264b7ab12 upstream. Add a marker for retpoline to the module VERMAGIC. This catches the case when a non RETPOLINE compiled module gets loaded into a retpoline kernel, making it insecure. It doesn't handle the case when retpoline has been runtime disabled. Even in this case the match of the retcompile status will be enforced. This implies that even with retpoline run time disabled all modules loaded need to be recompiled. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: David Woodhouse <dwmw@amazon.co.uk> Cc: rusty@rustcorp.com.au Cc: arjan.van.de.ven@intel.com Cc: jeyu@kernel.org Cc: torvalds@linux-foundation.org Link: https://lkml.kernel.org/r/20180116205228.4890-1-andi@firstfloor.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/vermagic.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/vermagic.h b/include/linux/vermagic.h
index 6f8fbcf10dfb..a3d04934aa96 100644
--- a/include/linux/vermagic.h
+++ b/include/linux/vermagic.h
@@ -24,10 +24,16 @@
#ifndef MODULE_ARCH_VERMAGIC
#define MODULE_ARCH_VERMAGIC ""
#endif
+#ifdef RETPOLINE
+#define MODULE_VERMAGIC_RETPOLINE "retpoline "
+#else
+#define MODULE_VERMAGIC_RETPOLINE ""
+#endif
#define VERMAGIC_STRING \
UTS_RELEASE " " \
MODULE_VERMAGIC_SMP MODULE_VERMAGIC_PREEMPT \
MODULE_VERMAGIC_MODULE_UNLOAD MODULE_VERMAGIC_MODVERSIONS \
- MODULE_ARCH_VERMAGIC
+ MODULE_ARCH_VERMAGIC \
+ MODULE_VERMAGIC_RETPOLINE