Commit ba8fb775 authored by Andrey Konovalov's avatar Andrey Konovalov
Browse files

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: default avatarAndrey Konovalov <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino's avatarVincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: default avatarMarco Elver <elver@google.com>
---
Change-Id: Id2d836bf43b401bce1221cc06e745185f17b1cc
parent f25857d5
......@@ -33,11 +33,11 @@
#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;
......@@ -240,7 +240,7 @@ 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)
......@@ -249,7 +249,7 @@ 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)
......@@ -259,15 +259,15 @@ 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);
......@@ -276,17 +276,17 @@ 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;
}
}
......
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