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Commit 0190e477 authored by Sami Tolvanen's avatar Sami Tolvanen Committed by Gerrit - the friendly Code Review server
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UPSTREAM: dm verity: separate function for parsing opt args 



(cherry-picked from 753c1fd02807cb43a1c5d01d75d454054d46bdad)

Move optional argument parsing into a separate function to make it
easier to add more of them without making verity_ctr even longer.

Bug: 21893453

Change-Id: I754603a026d8fa305c9b2e3b2b9dd4b3a95014b1
Signed-off-by: default avatarSami Tolvanen <samitolvanen@google.com>
Reviewed-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Git-commit: 32df92db
Git-repo: https://git.linaro.org/kernel/linux-linaro-stable.git


Signed-off-by: default avatarImran Khan <kimran@codeaurora.org>
parent c0d10bb4

drivers/md/dm-verity.c

+43 −28
Original line number Diff line number Diff line
@@ -34,6 +34,8 @@ 
#define DM_VERITY_OPT_LOGGING		"ignore_corruption"

#define DM_VERITY_OPT_RESTART		"restart_on_corruption"



#define DM_VERITY_OPTS_MAX		1



static unsigned dm_verity_prefetch_cluster = DM_VERITY_DEFAULT_PREFETCH_SIZE;



module_param_named(prefetch_cluster, dm_verity_prefetch_cluster, uint, S_IRUGO | S_IWUSR);
@@ -739,6 +741,44 @@ static void verity_dtr(struct dm_target *ti) 
	kfree(v);

}



static int verity_parse_opt_args(struct dm_arg_set *as, struct dm_verity *v)

{

	int r;

	unsigned argc;

	struct dm_target *ti = v->ti;

	const char *arg_name;



	static struct dm_arg _args[] = {

		{0, DM_VERITY_OPTS_MAX, "Invalid number of feature args"},

	};



	r = dm_read_arg_group(_args, as, &argc, &ti->error);

	if (r)

		return -EINVAL;



	if (!argc)

		return 0;



	do {

		arg_name = dm_shift_arg(as);

		argc--;



		if (!strcasecmp(arg_name, DM_VERITY_OPT_LOGGING)) {

			v->mode = DM_VERITY_MODE_LOGGING;

			continue;



		} else if (!strcasecmp(arg_name, DM_VERITY_OPT_RESTART)) {

			v->mode = DM_VERITY_MODE_RESTART;

			continue;

		}



		ti->error = "Unrecognized verity feature request";

		return -EINVAL;

	} while (argc && !r);



	return r;

}



/*

 * Target parameters:

 *	<version>	The current format is version 1.
@@ -757,18 +797,13 @@ static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv) 
{

	struct dm_verity *v;

	struct dm_arg_set as;

	const char *opt_string;

	unsigned int num, opt_params;

	unsigned int num;

	unsigned long long num_ll;

	int r;

	int i;

	sector_t hash_position;

	char dummy;



	static struct dm_arg _args[] = {

		{0, 1, "Invalid number of feature args"},

	};



	v = kzalloc(sizeof(struct dm_verity), GFP_KERNEL);

	if (!v) {

		ti->error = "Cannot allocate verity structure";
@@ -913,30 +948,10 @@ static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv) 
		as.argc = argc;

		as.argv = argv;



		r = dm_read_arg_group(_args, &as, &opt_params, &ti->error);

		if (r)

			goto bad;



		while (opt_params) {

			opt_params--;

			opt_string = dm_shift_arg(&as);

			if (!opt_string) {

				ti->error = "Not enough feature arguments";

				r = -EINVAL;

				goto bad;

			}



			if (!strcasecmp(opt_string, DM_VERITY_OPT_LOGGING))

				v->mode = DM_VERITY_MODE_LOGGING;

			else if (!strcasecmp(opt_string, DM_VERITY_OPT_RESTART))

				v->mode = DM_VERITY_MODE_RESTART;

			else {

				ti->error = "Invalid feature arguments";

				r = -EINVAL;

		r = verity_parse_opt_args(&as, v);

		if (r < 0)

			goto bad;

	}

		}

	}



	v->hash_per_block_bits =

		__fls((1 << v->hash_dev_block_bits) / v->digest_size);