On Sun, Feb 05, 2023 at 01:05:31AM -0600, Glenn Washburn wrote:
> The sector size in bytes is added to each line and it is allowed to be 5
> decimal digits long, which covers the most common cases of 512 and 4096
> byte sectors with space for an additional digit as future-proofing. The
> size allocation is updated to reflect this additional field, allow up to
> 5 characters and 1 space added.
>
> Signed-off-by: Glenn Washburn <developm...@efficientek.com>
> ---
> grub-core/disk/cryptodisk.c | 28 ++++++++++++++++++++--------
> 1 file changed, 20 insertions(+), 8 deletions(-)
>
> diff --git a/grub-core/disk/cryptodisk.c b/grub-core/disk/cryptodisk.c
> index 34b67a705f..f2c8c8d3fe 100644
> --- a/grub-core/disk/cryptodisk.c
> +++ b/grub-core/disk/cryptodisk.c
> @@ -1478,12 +1478,22 @@ luks_script_get (grub_size_t *sz)
> *sz = 0;
>
> for (i = cryptodisk_list; i != NULL; i = i->next)
> - if (grub_strcmp (i->modname, "luks") == 0)
> + if (grub_strcmp (i->modname, "luks") == 0 ||
> + grub_strcmp (i->modname, "luks2") == 0)
> {
> - size += sizeof ("luks_mount ");
> + size += grub_strlen (i->modname);
> + size += sizeof ("_mount");
> size += grub_strlen (i->uuid);
> size += grub_strlen (i->cipher->cipher->name);
> - size += 54;
> + /*
> + * Add space in the line for (in order) spaces, cipher mode, cipher IV
> + * mode, sector offset, sector size and the trailing newline. This is
> + * an upper bound on the size of this data. There are 16 extra bytes
> + * in an earlier version of this code that are unaccounted for. It is
> + * left in the calculations in case it is needed. At worst, its short-
> + * lived wasted space.
> + */
> + size += 5 + 5 + 8 + 20 + 5 + 1 + 16;
> if (i->essiv_hash)
> size += grub_strlen (i->essiv_hash->name);
> size += i->keysize * 2;
> @@ -1496,16 +1506,18 @@ luks_script_get (grub_size_t *sz)
> ptr = ret;
>
> for (i = cryptodisk_list; i != NULL; i = i->next)
> - if (grub_strcmp (i->modname, "luks") == 0)
> + if (grub_strcmp (i->modname, "luks") == 0 ||
> + grub_strcmp (i->modname, "luks2") == 0)
> {
> unsigned j;
> const char *iptr;
> - ptr = grub_stpcpy (ptr, "luks_mount ");
> + ptr = grub_stpcpy (ptr, i->modname);
> + ptr = grub_stpcpy (ptr, "_mount ");
> ptr = grub_stpcpy (ptr, i->uuid);
> *ptr++ = ' ';
> - grub_snprintf (ptr, 21, "%" PRIuGRUB_UINT64_T " ", i->offset_sectors);
> - while (*ptr)
> - ptr++;
> + ptr += grub_snprintf (ptr, 21, "%" PRIuGRUB_UINT64_T " ",
> + i->offset_sectors);
You, OK not you :-), blindly assume offset_sectors is 64-bit long. Today
it is but in the future it may not. May I ask you to define PRIuGRUB_DISK_ADDR,
etc. properly and fix the problem here and in the other places if needed?
> + ptr += grub_snprintf (ptr, 7, "%d ", 1 << i->log_sector_size);
Ugh... Simple "grep -Ir log_sector_size include" revealed we use
different types in different places for log_sector_size. The most
worrying for me are include/grub/disk.h and include/grub/cryptodisk.h.
OK, probably it is not big problem here but I would prefer if we
are consistent all over the place. I think it would be good to do
"typedef grub_uint32_t grub_disk_secs_t" and use grub_disk_secs_t
consistently everywhere. Could you do that? Of course it can be
a separate patch set...
Daniel
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