On Fri, Sep 25, 2020 at 12:50AM +0200, Andrey Konovalov wrote: > 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 <[email protected]> > Signed-off-by: Vincenzo Frascino <[email protected]>
Reviewed-by: Marco Elver <[email protected]> > --- > Change-Id: Id2d836bf43b401bce1221cc06e745185f17b1cc > --- > 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 67aa30b45805..13b27675a696 100644 > --- a/mm/kasan/report.c > +++ b/mm/kasan/report.c > @@ -31,11 +31,11 @@ > #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; > > @@ -238,7 +238,7 @@ 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) > @@ -247,7 +247,7 @@ 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) > @@ -257,15 +257,15 @@ 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); > @@ -274,17 +274,17 @@ 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; > } > } > > -- > 2.28.0.681.g6f77f65b4e-goog >
