linux-kernel - [PATCH 17/35] kasan: rename SHADOW layout macros to META

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Message-Id: <1142e2ec61dfc863a4ec5b92b60c97120957ec80.1597425745.git.andreyknvl@google.com>
Date:   Fri, 14 Aug 2020 19:26:59 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kasan-dev@...glegroups.com
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 17/35] kasan: rename SHADOW layout macros to META

This is a preparatory commit for the upcoming addition of a new hardware
tag-based (MTE-based) KASAN mode.

Hardware tag-based KASAN won't be using shadow memory, but will reuse
these macros. Rename "SHADOW" to implementation-neutral "META".

No functional changes.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 mm/kasan/report.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 2cce7c9beea3..6306673e7062 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -36,11 +36,11 @@
 #include "kasan.h"
 #include "../slab.h"
 
-/* Shadow layout customization. */
-#define SHADOW_BYTES_PER_BLOCK 1
-#define SHADOW_BLOCKS_PER_ROW 16
-#define SHADOW_BYTES_PER_ROW (SHADOW_BLOCKS_PER_ROW * SHADOW_BYTES_PER_BLOCK)
-#define SHADOW_ROWS_AROUND_ADDR 2
+/* Metadata layout customization. */
+#define META_BYTES_PER_BLOCK 1
+#define META_BLOCKS_PER_ROW 16
+#define META_BYTES_PER_ROW (META_BLOCKS_PER_ROW * META_BYTES_PER_BLOCK)
+#define META_ROWS_AROUND_ADDR 2
 
 static unsigned long kasan_flags;
 
@@ -243,7 +243,7 @@ static void print_address_description(void *addr, u8 tag)
 
 static bool row_is_guilty(const void *row, const void *guilty)
 {
-	return (row <= guilty) && (guilty < row + SHADOW_BYTES_PER_ROW);
+	return (row <= guilty) && (guilty < row + META_BYTES_PER_ROW);
 }
 
 static int shadow_pointer_offset(const void *row, const void *shadow)
@@ -252,7 +252,7 @@ static int shadow_pointer_offset(const void *row, const void *shadow)
 	 *    3 + (BITS_PER_LONG/8)*2 chars.
 	 */
 	return 3 + (BITS_PER_LONG/8)*2 + (shadow - row)*2 +
-		(shadow - row) / SHADOW_BYTES_PER_BLOCK + 1;
+		(shadow - row) / META_BYTES_PER_BLOCK + 1;
 }
 
 static void print_memory_metadata(const void *addr)
@@ -262,15 +262,15 @@ static void print_memory_metadata(const void *addr)
 	const void *shadow_row;
 
 	shadow_row = (void *)round_down((unsigned long)shadow,
-					SHADOW_BYTES_PER_ROW)
-		- SHADOW_ROWS_AROUND_ADDR * SHADOW_BYTES_PER_ROW;
+					META_BYTES_PER_ROW)
+		- META_ROWS_AROUND_ADDR * META_BYTES_PER_ROW;
 
 	pr_err("Memory state around the buggy address:\n");
 
-	for (i = -SHADOW_ROWS_AROUND_ADDR; i <= SHADOW_ROWS_AROUND_ADDR; i++) {
+	for (i = -META_ROWS_AROUND_ADDR; i <= META_ROWS_AROUND_ADDR; i++) {
 		const void *kaddr = kasan_shadow_to_mem(shadow_row);
 		char buffer[4 + (BITS_PER_LONG/8)*2];
-		char shadow_buf[SHADOW_BYTES_PER_ROW];
+		char shadow_buf[META_BYTES_PER_ROW];
 
 		snprintf(buffer, sizeof(buffer),
 			(i == 0) ? ">%px: " : " %px: ", kaddr);
@@ -279,17 +279,17 @@ static void print_memory_metadata(const void *addr)
 		 * function, because generic functions may try to
 		 * access kasan mapping for the passed address.
 		 */
-		memcpy(shadow_buf, shadow_row, SHADOW_BYTES_PER_ROW);
+		memcpy(shadow_buf, shadow_row, META_BYTES_PER_ROW);
 		print_hex_dump(KERN_ERR, buffer,
-			DUMP_PREFIX_NONE, SHADOW_BYTES_PER_ROW, 1,
-			shadow_buf, SHADOW_BYTES_PER_ROW, 0);
+			DUMP_PREFIX_NONE, META_BYTES_PER_ROW, 1,
+			shadow_buf, META_BYTES_PER_ROW, 0);
 
 		if (row_is_guilty(shadow_row, shadow))
 			pr_err("%*c\n",
 				shadow_pointer_offset(shadow_row, shadow),
 				'^');
 
-		shadow_row += SHADOW_BYTES_PER_ROW;
+		shadow_row += META_BYTES_PER_ROW;
 	}
 }
 
-- 
2.28.0.220.ged08abb693-goog