We are not in a critical failure path. The invalid register type is caused
when trying to decode invalid instruction bytes from a user-space program.
Thus, simply print an error message. To prevent this warning from being
abused from user space programs, use the rate-limited variant of printk.
Cc: Borislav Petkov <b...@suse.de>
Cc: Andy Lutomirski <l...@kernel.org>
Cc: Dave Hansen <dave.han...@linux.intel.com>
Cc: Adam Buchbinder <adam.buchbin...@gmail.com>
Cc: Colin Ian King <colin.k...@canonical.com>
Cc: Lorenzo Stoakes <lstoa...@gmail.com>
Cc: Qiaowei Ren <qiaowei....@intel.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Masami Hiramatsu <mhira...@kernel.org>
Cc: Adrian Hunter <adrian.hun...@intel.com>
Cc: Kees Cook <keesc...@chromium.org>
Cc: Thomas Garnier <thgar...@google.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Dmitry Vyukov <dvyu...@google.com>
Cc: Ravi V. Shankar <ravi.v.shan...@intel.com>
Cc: x...@kernel.org
Signed-off-by: Ricardo Neri <ricardo.neri-calde...@linux.intel.com>
---
arch/x86/lib/insn-eval.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c
index e746a6f..182e2ae 100644
--- a/arch/x86/lib/insn-eval.c
+++ b/arch/x86/lib/insn-eval.c
@@ -5,6 +5,7 @@
*/
#include <linux/kernel.h>
#include <linux/string.h>
+#include <linux/ratelimit.h>
#include <asm/inat.h>
#include <asm/insn.h>
#include <asm/insn-eval.h>
@@ -85,9 +86,8 @@ static int get_reg_offset(struct insn *insn, struct pt_regs
*regs,
break;
default:
- pr_err("invalid register type");
- BUG();
- break;
+ printk_ratelimited(KERN_ERR "insn-eval: x86: invalid register
type");
+ return -EINVAL;
}
if (regno >= nr_registers) {
--
2.9.3
--
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