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x86/insn-eval: Do not BUG on invalid register type

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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 pr_err().
along with a descriptive prefix.

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: ricardo.neri@intel.com
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: Qiaowei Ren <qiaowei.ren@intel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Chen Yucong <slaoub@gmail.com>
Cc: Adam Buchbinder <adam.buchbinder@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Garnier <thgarnie@google.com>
Link: https://lkml.kernel.org/r/1509135945-13762-11-git-send-email-ricardo.neri-calderon@linux.intel.com
This commit is contained in:
Ricardo Neri 2017-10-27 13:25:37 -07:00 committed by Thomas Gleixner
parent 32542ee295
commit ed594e4ba5
1 changed files with 6 additions and 3 deletions
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9
arch/x86/lib/insn-eval.c
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@ -5,10 +5,14 @@
*/
#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>
#undef pr_fmt
#define pr_fmt(fmt) "insn: " fmt
enum reg_type {
REG_TYPE_RM = 0,
REG_TYPE_INDEX,
@ -85,9 +89,8 @@ static int get_reg_offset(struct insn *insn, struct pt_regs *regs,
break;
default:
pr_err("invalid register type");
BUG();
break;
pr_err_ratelimited("invalid register type: %d\n", type);
return -EINVAL;
}
if (regno >= nr_registers) {