x86/insn: Add a __ignore_sync_check__ marker

stable inclusion
from stable-v5.10.133
commit 76c513c87f599bc013c582522323a1b117b8f501
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5PTAS
CVE: CVE-2022-29900,CVE-2022-23816,CVE-2022-29901

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=76c513c87f599bc013c582522323a1b117b8f501

--------------------------------

commit d30c7b82 upstream.

Add an explicit __ignore_sync_check__ marker which will be used to mark
lines which are supposed to be ignored by file synchronization check
scripts, its advantage being that it explicitly denotes such lines in
the code.
Signed-off-by: NBorislav Petkov <bp@suse.de>
Reviewed-by: NMasami Hiramatsu <mhiramat@kernel.org>
Link: https://lkml.kernel.org/r/20210304174237.31945-4-bp@alien8.deSigned-off-by: NBen Hutchings <ben@decadent.org.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NLin Yujun <linyujun809@huawei.com>
Reviewed-by: NZhang Jianhua <chris.zjh@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/x86/include/asm/inat.h

@@ -6,7 +6,7 @@
  *
  * Written by Masami Hiramatsu <mhiramat@redhat.com>
  */
-#include <asm/inat_types.h>
+#include <asm/inat_types.h> /* __ignore_sync_check__ */
 
 /*
  * Internal bits. Don't use bitmasks directly, because these bits are

arch/x86/include/asm/insn.h

@@ -8,7 +8,7 @@
  */
 
 /* insn_attr_t is defined in inat.h */
-#include <asm/inat.h>
+#include <asm/inat.h> /* __ignore_sync_check__ */
 
 struct insn_field {
 	union {

arch/x86/lib/inat.c

@@ -4,7 +4,7 @@
  *
  * Written by Masami Hiramatsu <mhiramat@redhat.com>
  */
-#include <asm/insn.h>
+#include <asm/insn.h> /* __ignore_sync_check__ */
 
 /* Attribute tables are generated from opcode map */
 #include "inat-tables.c"

arch/x86/lib/insn.c

@@ -10,10 +10,10 @@
 #else
 #include <string.h>
 #endif
-#include <asm/inat.h>
-#include <asm/insn.h>
+#include <asm/inat.h> /*__ignore_sync_check__ */
+#include <asm/insn.h> /* __ignore_sync_check__ */
 
-#include <asm/emulate_prefix.h>
+#include <asm/emulate_prefix.h> /* __ignore_sync_check__ */
 
 /* Verify next sizeof(t) bytes can be on the same instruction */
 #define validate_next(t, insn, n)	\

tools/arch/x86/include/asm/inat.h

@@ -6,7 +6,7 @@
  *
  * Written by Masami Hiramatsu <mhiramat@redhat.com>
  */
-#include "inat_types.h"
+#include "inat_types.h" /* __ignore_sync_check__ */
 
 /*
  * Internal bits. Don't use bitmasks directly, because these bits are

tools/arch/x86/include/asm/insn.h

@@ -8,7 +8,7 @@
  */
 
 /* insn_attr_t is defined in inat.h */
-#include "inat.h"
+#include "inat.h" /* __ignore_sync_check__ */
 
 struct insn_field {
 	union {

tools/arch/x86/lib/inat.c

@@ -4,7 +4,7 @@
  *
  * Written by Masami Hiramatsu <mhiramat@redhat.com>
  */
-#include "../include/asm/insn.h"
+#include "../include/asm/insn.h" /* __ignore_sync_check__ */
 
 /* Attribute tables are generated from opcode map */
 #include "inat-tables.c"

tools/arch/x86/lib/insn.c

@@ -10,10 +10,10 @@
 #else
 #include <string.h>
 #endif
-#include "../include/asm/inat.h"
-#include "../include/asm/insn.h"
+#include "../include/asm/inat.h" /* __ignore_sync_check__ */
+#include "../include/asm/insn.h" /* __ignore_sync_check__ */
 
-#include "../include/asm/emulate_prefix.h"
+#include "../include/asm/emulate_prefix.h" /* __ignore_sync_check__ */
 
 /* Verify next sizeof(t) bytes can be on the same instruction */
 #define validate_next(t, insn, n)	\

tools/objtool/sync-check.sh

@@ -16,11 +16,14 @@ arch/x86/include/asm/emulate_prefix.h
 arch/x86/lib/x86-opcode-map.txt
 arch/x86/tools/gen-insn-attr-x86.awk
 include/linux/static_call_types.h
-arch/x86/include/asm/inat.h     -I '^#include [\"<]\(asm/\)*inat_types.h[\">]'
-arch/x86/include/asm/insn.h     -I '^#include [\"<]\(asm/\)*inat.h[\">]'
-arch/x86/lib/inat.c             -I '^#include [\"<]\(../include/\)*asm/insn.h[\">]'
-arch/x86/lib/insn.c             -I '^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]' -I '^#include [\"<]\(../include/\)*asm/emulate_prefix.h[\">]'
 "
+
+SYNC_CHECK_FILES='
+arch/x86/include/asm/inat.h
+arch/x86/include/asm/insn.h
+arch/x86/lib/inat.c
+arch/x86/lib/insn.c
+'
 fi
 
 check_2 () {
@@ -63,3 +66,9 @@ while read -r file_entry; do
 done <<EOF
 $FILES
 EOF
+
+if [ "$SRCARCH" = "x86" ]; then
+	for i in $SYNC_CHECK_FILES; do
+		check $i '-I "^.*\/\*.*__ignore_sync_check__.*\*\/.*$"'
+	done
+fi

tools/perf/check-headers.sh

@@ -75,6 +75,13 @@ include/uapi/asm-generic/mman-common.h
 include/uapi/asm-generic/unistd.h
 '
 
+SYNC_CHECK_FILES='
+arch/x86/include/asm/inat.h
+arch/x86/include/asm/insn.h
+arch/x86/lib/inat.c
+arch/x86/lib/insn.c
+'
+
 # These copies are under tools/perf/trace/beauty/ as they are not used to in
 # building object files only by scripts in tools/perf/trace/beauty/ to generate
 # tables that then gets included in .c files for things like id->string syscall
@@ -129,6 +136,10 @@ for i in $FILES; do
   check $i -B
 done
 
+for i in $SYNC_CHECK_FILES; do
+  check $i '-I "^.*\/\*.*__ignore_sync_check__.*\*\/.*$"'
+done
+
 # diff with extra ignore lines
 check arch/x86/lib/memcpy_64.S        '-I "^EXPORT_SYMBOL" -I "^#include <asm/export.h>" -I"^SYM_FUNC_START\(_LOCAL\)*(memcpy_\(erms\|orig\))"'
 check arch/x86/lib/memset_64.S        '-I "^EXPORT_SYMBOL" -I "^#include <asm/export.h>" -I"^SYM_FUNC_START\(_LOCAL\)*(memset_\(erms\|orig\))"'
@@ -137,10 +148,6 @@ check include/uapi/linux/mman.h       '-I "^#include <\(uapi/\)*asm/mman.h>"'
 check include/linux/build_bug.h       '-I "^#\(ifndef\|endif\)\( \/\/\)* static_assert$"'
 check include/linux/ctype.h	      '-I "isdigit("'
 check lib/ctype.c		      '-I "^EXPORT_SYMBOL" -I "^#include <linux/export.h>" -B'
-check arch/x86/include/asm/inat.h     '-I "^#include [\"<]\(asm/\)*inat_types.h[\">]"'
-check arch/x86/include/asm/insn.h     '-I "^#include [\"<]\(asm/\)*inat.h[\">]"'
-check arch/x86/lib/inat.c	      '-I "^#include [\"<]\(../include/\)*asm/insn.h[\">]"'
-check arch/x86/lib/insn.c             '-I "^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]" -I "^#include [\"<]\(../include/\)*asm/emulate_prefix.h[\">]"'
 
 # diff non-symmetric files
 check_2 tools/perf/arch/x86/entry/syscalls/syscall_64.tbl arch/x86/entry/syscalls/syscall_64.tbl