print_shadow_for

static void print_shadow_for_address(const void *addr)
{
    int i;
    const void *shadow = kasan_mem_to_shadow(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;
 
    pr_err("Memory state around the buggy address:\n");
 
    for (i = -SHADOW_ROWS_AROUND_ADDR; i <= SHADOW_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];
 
        snprintf(buffer, sizeof(buffer),
            (i == 0) ? ">%px: " : " %px: ", kaddr);
        /*
         * We should not pass a shadow pointer to generic
         * function, because generic functions may try to
         * access kasan mapping for the passed address.
         */
        memcpy(shadow_buf, shadow_row, SHADOW_BYTES_PER_ROW);
        print_hex_dump(KERN_ERR, buffer,
            DUMP_PREFIX_NONE, SHADOW_BYTES_PER_ROW, 1,
            shadow_buf, SHADOW_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;
    }
}
函数源码
