[src/trunk]: src/sys Add KASAN_PANIC, an option to turn KASAN warning into ke...

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/35710ab1c2d0
branches:  trunk
changeset: 452016:35710ab1c2d0
user:      maxv <maxv%NetBSD.org@localhost>
date:      Sat Jun 15 06:40:34 2019 +0000

description:
Add KASAN_PANIC, an option to turn KASAN warning into kernel panics,
requested by Siddharth. While here clarify a little.

diffstat:

 sys/arch/amd64/conf/GENERIC    |  14 ++++++++------
 sys/arch/evbarm/conf/GENERIC64 |  12 ++++++++----
 sys/conf/files                 |   3 ++-
 sys/kern/subr_asan.c           |  12 +++++++++---
 4 files changed, 27 insertions(+), 14 deletions(-)

diffs (119 lines):

diff -r dcd169ad32f9 -r 35710ab1c2d0 sys/arch/amd64/conf/GENERIC
--- a/sys/arch/amd64/conf/GENERIC       Sat Jun 15 04:00:17 2019 +0000
+++ b/sys/arch/amd64/conf/GENERIC       Sat Jun 15 06:40:34 2019 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: GENERIC,v 1.528 2019/05/24 14:28:48 nonaka Exp $
+# $NetBSD: GENERIC,v 1.529 2019/06/15 06:40:34 maxv Exp $
 #
 # GENERIC machine description file
 #
@@ -22,7 +22,7 @@
 
 options        INCLUDE_CONFIG_FILE     # embed config file in kernel binary
 
-#ident         "GENERIC-$Revision: 1.528 $"
+#ident         "GENERIC-$Revision: 1.529 $"
 
 maxusers       64              # estimated number of users
 
@@ -123,10 +123,12 @@
 
 # Kernel Address Sanitizer (kASan). You need to disable SVS to use it.
 # The quarantine is optional and can help KASAN find more use-after-frees.
-#makeoptions   KASAN=1         # Kernel Address Sanitizer
-#options       KASAN
-#no options    SVS
-#options       POOL_QUARANTINE
+# Use KASAN_PANIC if you want panics instead of warnings.
+#makeoptions   KASAN=1         # mandatory
+#options       KASAN           # mandatory
+#no options    SVS             # mandatory
+#options       POOL_QUARANTINE # optional
+#options       KASAN_PANIC     # optional
 
 # Kernel Info Leak Detector.
 #makeoptions   KLEAK=1
diff -r dcd169ad32f9 -r 35710ab1c2d0 sys/arch/evbarm/conf/GENERIC64
--- a/sys/arch/evbarm/conf/GENERIC64    Sat Jun 15 04:00:17 2019 +0000
+++ b/sys/arch/evbarm/conf/GENERIC64    Sat Jun 15 06:40:34 2019 +0000
@@ -1,5 +1,5 @@
 #
-#      $NetBSD: GENERIC64,v 1.98 2019/06/13 13:35:41 jmcneill Exp $
+#      $NetBSD: GENERIC64,v 1.99 2019/06/15 06:40:34 maxv Exp $
 #
 #      GENERIC ARM (aarch64) kernel
 #
@@ -132,9 +132,13 @@
 #options       EARLYCONS=thunderx, CONSADDR=0x87e024000000
 #options       EARLYCONS=virt
 
-# Kernel Address Sanitizer (kASan).
-#makeoptions   KASAN=1         # Kernel Address Sanitizer
-#options       KASAN
+# Kernel Address Sanitizer (kASan). The quarantine is optional and can
+# help KASAN find more use-after-frees. Use KASAN_PANIC if you want panics
+# instead of warnings.
+#makeoptions   KASAN=1         # mandatory
+#options       KASAN           # mandatory
+#options       POOL_QUARANTINE # optional
+#options       KASAN_PANIC     # optional
 
 makeoptions    DEBUG="-g"      # compile full symbol table
 makeoptions    COPY_SYMTAB=1
diff -r dcd169ad32f9 -r 35710ab1c2d0 sys/conf/files
--- a/sys/conf/files    Sat Jun 15 04:00:17 2019 +0000
+++ b/sys/conf/files    Sat Jun 15 06:40:34 2019 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: files,v 1.1236 2019/05/17 03:34:26 ozaki-r Exp $
+#      $NetBSD: files,v 1.1237 2019/06/15 06:40:34 maxv Exp $
 #      @(#)files.newconf       7.5 (Berkeley) 5/10/93
 
 version        20171118
@@ -30,6 +30,7 @@
 defflag opt_diagnostic.h       _DIAGNOSTIC
 defflag                                GPROF
 defflag                                KASAN
+defflag opt_kasan.h            KASAN_PANIC
 defflag                                KLEAK
 defflag                                KCOV
 defflag opt_pool.h             POOL_QUARANTINE
diff -r dcd169ad32f9 -r 35710ab1c2d0 sys/kern/subr_asan.c
--- a/sys/kern/subr_asan.c      Sat Jun 15 04:00:17 2019 +0000
+++ b/sys/kern/subr_asan.c      Sat Jun 15 06:40:34 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: subr_asan.c,v 1.9 2019/05/04 17:19:10 maxv Exp $       */
+/*     $NetBSD: subr_asan.c,v 1.10 2019/06/15 06:40:34 maxv Exp $      */
 
 /*
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_asan.c,v 1.9 2019/05/04 17:19:10 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_asan.c,v 1.10 2019/06/15 06:40:34 maxv Exp $");
 
 #include <sys/param.h>
 #include <sys/device.h>
@@ -43,6 +43,12 @@
 
 #include <uvm/uvm.h>
 
+#ifdef KASAN_PANIC
+#define REPORT panic
+#else
+#define REPORT printf
+#endif
+
 /* ASAN constants. Part of the compiler ABI. */
 #define KASAN_SHADOW_SCALE_SHIFT       3
 #define KASAN_SHADOW_SCALE_SIZE                (1UL << KASAN_SHADOW_SCALE_SHIFT)
@@ -185,7 +191,7 @@
 kasan_report(unsigned long addr, size_t size, bool write, unsigned long pc,
     uint8_t code)
 {
-       printf("ASan: Unauthorized Access In %p: Addr %p [%zu byte%s, %s,"
+       REPORT("ASan: Unauthorized Access In %p: Addr %p [%zu byte%s, %s,"
            " %s]\n",
            (void *)pc, (void *)addr, size, (size > 1 ? "s" : ""),
            (write ? "write" : "read"), kasan_code_name(code));