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ANDROID: sdcardfs: Add default_normal option

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The default_normal option causes mounts with the gid set to
AID_SDCARD_RW to have user specific gids, as in the normal case.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Change-Id: I9619b8ac55f41415df943484dc8db1ea986cef6f
Bug: 64672411
This commit is contained in:
Daniel Rosenberg 2018-01-02 14:44:49 -08:00 committed by Artem Borisov
parent 4ac97e3645
commit 783ca29469
3 changed files with 10 additions and 1 deletions
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6
fs/sdcardfs/main.c
View file

@ -33,6 +33,7 @@ enum {
Opt_userid,
Opt_reserved_mb,
Opt_gid_derivation,
Opt_default_normal,
Opt_err,
};
@ -45,6 +46,7 @@ static const match_table_t sdcardfs_tokens = {
{Opt_userid, "userid=%d"},
{Opt_multiuser, "multiuser"},
{Opt_gid_derivation, "derive_gid"},
{Opt_default_normal, "default_normal"},
{Opt_reserved_mb, "reserved_mb=%u"},
{Opt_err, NULL}
};
@ -68,6 +70,7 @@ static int parse_options(struct super_block *sb, char *options, int silent,
opts->reserved_mb = 0;
/* by default, gid derivation is off */
opts->gid_derivation = false;
vfsopts->default_normal = false;
*debug = 0;
@ -122,6 +125,8 @@ static int parse_options(struct super_block *sb, char *options, int silent,
case Opt_gid_derivation:
opts->gid_derivation = true;
break;
case Opt_default_normal:
vfsopts->default_normal = true;
/* unknown option */
default:
if (!silent)
@ -175,6 +180,7 @@ int parse_options_remount(struct super_block *sb, char *options, int silent,
return 0;
vfsopts->mask = option;
break;
case Opt_default_normal:
case Opt_multiuser:
case Opt_userid:
case Opt_fsuid:

3
fs/sdcardfs/sdcardfs.h
View file

@ -225,6 +225,7 @@ struct sdcardfs_mount_options {
struct sdcardfs_vfsmount_options {
gid_t gid;
mode_t mask;
bool default_normal;
};
extern int parse_options_remount(struct super_block *sb, char *options, int silent,
@ -416,7 +417,7 @@ static inline int get_gid(struct vfsmount *mnt,
{
struct sdcardfs_vfsmount_options *opts = mnt->data;
if (opts->gid == AID_SDCARD_RW)
if (opts->gid == AID_SDCARD_RW && !opts->default_normal)
/* As an optimization, certain trusted system components only run
* as owner but operate across all users. Since we're now handing
* out the sdcard_rw GID only to trusted apps, we're okay relaxing

2
fs/sdcardfs/super.c
View file

@ -304,6 +304,8 @@ static int sdcardfs_show_options(struct vfsmount *mnt, struct seq_file *m,
seq_printf(m, ",userid=%u", opts->fs_user_id);
if (opts->gid_derivation)
seq_puts(m, ",derive_gid");
if (vfsopts->default_normal)
seq_puts(m, ",default_normal");
if (opts->reserved_mb != 0)
seq_printf(m, ",reserved=%uMB", opts->reserved_mb);