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Commit 53a08829 authored by Daniel Rosenberg's avatar Daniel Rosenberg
Browse files

ANDROID: Sdcardfs: Move gid derivation under flag 



This moves the code to adjust the gid/uid of lower filesystem
files under the mount flag derive_gid.

Signed-off-by: default avatarDaniel Rosenberg <drosen@google.com>
Change-Id: I44eaad4ef67c7fcfda3b6ea3502afab94442610c
Bug: 63245673
parent f1c935b3

fs/sdcardfs/derived_perm.c

+3 −0
Original line number Diff line number Diff line
@@ -176,6 +176,9 @@ void fixup_lower_ownership(struct dentry *dentry, const char *name) 
	gid_t gid = sbi->options.fs_low_gid;

	struct iattr newattrs;



	if (!sbi->options.gid_derivation)

		return;



	info = SDCARDFS_I(d_inode(dentry));

	info_d = info->data;

	perm = info_d->perm;

fs/sdcardfs/inode.c

+8 −4
Original line number Diff line number Diff line
@@ -34,10 +34,14 @@ const struct cred *override_fsids(struct sdcardfs_sb_info *sbi, 
	if (!cred)

		return NULL;



	if (sbi->options.gid_derivation) {

		if (data->under_obb)

			uid = AID_MEDIA_OBB;

		else

			uid = multiuser_get_uid(data->userid, sbi->options.fs_low_uid);

	} else {

		uid = sbi->options.fs_low_uid;

	}

	cred->fsuid = make_kuid(&init_user_ns, uid);

	cred->fsgid = make_kgid(&init_user_ns, sbi->options.fs_low_gid);

fs/sdcardfs/main.c

+7 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ enum { 
	Opt_multiuser,

	Opt_userid,

	Opt_reserved_mb,

	Opt_gid_derivation,

	Opt_err,

};
@@ -43,6 +44,7 @@ static const match_table_t sdcardfs_tokens = { 
	{Opt_mask, "mask=%u"},

	{Opt_userid, "userid=%d"},

	{Opt_multiuser, "multiuser"},

	{Opt_gid_derivation, "derive_gid"},

	{Opt_reserved_mb, "reserved_mb=%u"},

	{Opt_err, NULL}

};
@@ -64,6 +66,8 @@ static int parse_options(struct super_block *sb, char *options, int silent, 
	vfsopts->gid = 0;

	/* by default, 0MB is reserved */

	opts->reserved_mb = 0;

	/* by default, gid derivation is off */

	opts->gid_derivation = false;



	*debug = 0;
@@ -115,6 +119,9 @@ static int parse_options(struct super_block *sb, char *options, int silent, 
				return 0;

			opts->reserved_mb = option;

			break;

		case Opt_gid_derivation:

			opts->gid_derivation = true;

			break;

		/* unknown option */

		default:

			if (!silent)

fs/sdcardfs/sdcardfs.h

+1 −0
Original line number Diff line number Diff line
@@ -219,6 +219,7 @@ struct sdcardfs_mount_options { 
	gid_t fs_low_gid;

	userid_t fs_user_id;

	bool multiuser;

	bool gid_derivation;

	unsigned int reserved_mb;

};

fs/sdcardfs/super.c

+2 −0
Original line number Diff line number Diff line
@@ -302,6 +302,8 @@ static int sdcardfs_show_options(struct vfsmount *mnt, struct seq_file *m, 
		seq_printf(m, ",mask=%u", vfsopts->mask);

	if (opts->fs_user_id)

		seq_printf(m, ",userid=%u", opts->fs_user_id);

	if (opts->gid_derivation)

		seq_puts(m, ",derive_gid");

	if (opts->reserved_mb != 0)

		seq_printf(m, ",reserved=%uMB", opts->reserved_mb);