Re: [PATCH 3/3] cryptodisk: Move global variables into grub_cryptomount_args struct

[Patrick Steinhardt]

On Thu, Aug 26, 2021 at 12:08:52AM -0500, Glenn Washburn wrote:
> Signed-off-by: Glenn Washburn <development@efficientek.com>
> ---
>  grub-core/disk/cryptodisk.c | 26 +++++++++-----------------
>  include/grub/cryptodisk.h   |  3 +++
>  2 files changed, 12 insertions(+), 17 deletions(-)
> 
> diff --git a/grub-core/disk/cryptodisk.c b/grub-core/disk/cryptodisk.c
> index b6cf1835d..00a671a59 100644
> --- a/grub-core/disk/cryptodisk.c
> +++ b/grub-core/disk/cryptodisk.c
> @@ -984,9 +984,6 @@ grub_util_cryptodisk_get_uuid (grub_disk_t disk)
>  
>  #endif
>  
> -static int check_boot, have_it;
> -static char *search_uuid;
> -
>  static void
>  cryptodisk_close (grub_cryptodisk_t dev)
>  {
> @@ -1014,7 +1011,7 @@ grub_cryptodisk_scan_device_real (const char *name,
>  
>    FOR_CRYPTODISK_DEVS (cr)
>    {
> -    dev = cr->scan (source, search_uuid, check_boot);
> +    dev = cr->scan (source, cargs->search_uuid, cargs->check_boot);
>      if (grub_errno)
>        return grub_errno;
>      if (!dev)
> @@ -1051,7 +1048,7 @@ grub_cryptodisk_scan_device_real (const char *name,
>  
>      grub_cryptodisk_insert (dev, name, source);
>  
> -    have_it = 1;
> +    cargs->found_uuid = 1;
>  
>      goto cleanup;
>    }
> @@ -1093,7 +1090,7 @@ grub_cryptodisk_cheat_mount (const char *sourcedev, 
> const char *cheat)
>  
>    FOR_CRYPTODISK_DEVS (cr)
>    {
> -    dev = cr->scan (source, search_uuid, check_boot);
> +    dev = cr->scan (source, NULL, 0);
>      if (grub_errno)
>        return grub_errno;
>      if (!dev)
> @@ -1137,7 +1134,7 @@ grub_cryptodisk_scan_device (const char *name,
>    
>    if (err)
>      grub_print_error ();
> -  return have_it && search_uuid ? 1 : 0;
> +  return (cargs->found_uuid && cargs->search_uuid) ? 1 : 0;
>  }
>  
>  static grub_err_t
> @@ -1155,7 +1152,6 @@ grub_cmd_cryptomount (grub_extcmd_context_t ctxt, int 
> argc, char **args)
>        cargs.key_len = grub_strlen(state[3].arg);
>      }
>  
> -  have_it = 0;
>    if (state[0].set) /* uuid */
>      {
>        grub_cryptodisk_t dev;
> @@ -1168,21 +1164,18 @@ grub_cmd_cryptomount (grub_extcmd_context_t ctxt, int 
> argc, char **args)
>         return GRUB_ERR_NONE;
>       }
>  
> -      check_boot = state[2].set;
> -      search_uuid = args[0];
> +      cargs.check_boot = state[2].set;
> +      cargs.search_uuid = args[0];
>        grub_device_iterate (&grub_cryptodisk_scan_device, &cargs);
> -      search_uuid = NULL;
>  
> -      if (!have_it)
> +      if (!cargs.found_uuid)
>       return grub_error (GRUB_ERR_BAD_ARGUMENT, "no such cryptodisk found");
>        return GRUB_ERR_NONE;
>      }
>    else if (state[1].set || (argc == 0 && state[2].set)) /* -a|-b */
>      {
> -      search_uuid = NULL;
> -      check_boot = state[2].set;
> +      cargs.check_boot = state[2].set;
>        grub_device_iterate (&grub_cryptodisk_scan_device, &cargs);
> -      search_uuid = NULL;
>        return GRUB_ERR_NONE;
>      }
>    else
> @@ -1194,8 +1187,7 @@ grub_cmd_cryptomount (grub_extcmd_context_t ctxt, int 
> argc, char **args)
>        char *disklast = NULL;
>        grub_size_t len;
>  
> -      search_uuid = NULL;
> -      check_boot = state[2].set;
> +      cargs.check_boot = state[2].set;
>        diskname = args[0];
>        len = grub_strlen (diskname);
>        if (len && diskname[0] == '(' && diskname[len - 1] == ')')
> diff --git a/include/grub/cryptodisk.h b/include/grub/cryptodisk.h
> index 1070140d9..11062f43a 100644
> --- a/include/grub/cryptodisk.h
> +++ b/include/grub/cryptodisk.h
> @@ -69,6 +69,9 @@ typedef gcry_err_code_t
>  
>  struct grub_cryptomount_args
>  {
> +  grub_uint32_t check_boot : 1;
> +  grub_uint32_t found_uuid : 1;
> +  char *search_uuid;
>    grub_uint8_t *key_data;
>    grub_size_t key_len;
>  };

Aren't these parameters in a different scope than the key data? These
are only used for device discovery via `scan()`, while the other ones
are for decrypting the key. Do we want to split those up into two
different structs?

Patrick

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