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userns: Convert jffs2 to use kuid and kgid where appropriate 

- General routine uid/gid conversion work
- When storing posix acls treat ACL_USER and ACL_GROUP separately
  so I can call from_kuid or from_kgid as appropriate.
- When reading posix acls treat ACL_USER and ACL_GROUP separately
  so I can call make_kuid or make_kgid as appropriate.

Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2012-02-07 16:28:39 -08:00
parent 0e1a43c716
commit 0cfe53d3c3
5 changed files with 39 additions and 24 deletions
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26
fs/jffs2/acl.c
View File

@ -94,15 +94,23 @@ static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size)
case ACL_MASK:
case ACL_OTHER:
value += sizeof(struct jffs2_acl_entry_short);
acl->a_entries[i].e_id = ACL_UNDEFINED_ID;
break;
case ACL_USER:
value += sizeof(struct jffs2_acl_entry);
if (value > end)
goto fail;
acl->a_entries[i].e_uid =
make_kuid(&init_user_ns,
je32_to_cpu(entry->e_id));
break;
case ACL_GROUP:
value += sizeof(struct jffs2_acl_entry);
if (value > end)
goto fail;
acl->a_entries[i].e_id = je32_to_cpu(entry->e_id);
acl->a_entries[i].e_gid =
make_kgid(&init_user_ns,
je32_to_cpu(entry->e_id));
break;
default:
@ -131,13 +139,19 @@ static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size)
header->a_version = cpu_to_je32(JFFS2_ACL_VERSION);
e = header + 1;
for (i=0; i < acl->a_count; i++) {
const struct posix_acl_entry *acl_e = &acl->a_entries[i];
entry = e;
entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag);
entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm);
switch(acl->a_entries[i].e_tag) {
entry->e_tag = cpu_to_je16(acl_e->e_tag);
entry->e_perm = cpu_to_je16(acl_e->e_perm);
switch(acl_e->e_tag) {
case ACL_USER:
entry->e_id = cpu_to_je32(
from_kuid(&init_user_ns, acl_e->e_uid));
e += sizeof(struct jffs2_acl_entry);
break;
case ACL_GROUP:
entry->e_id = cpu_to_je32(acl->a_entries[i].e_id);
entry->e_id = cpu_to_je32(
from_kgid(&init_user_ns, acl_e->e_gid));
e += sizeof(struct jffs2_acl_entry);
break;

8
fs/jffs2/file.c
View File

@ -175,8 +175,8 @@ static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
ri.ino = cpu_to_je32(f->inocache->ino);
ri.version = cpu_to_je32(++f->highest_version);
ri.mode = cpu_to_jemode(inode->i_mode);
ri.uid = cpu_to_je16(inode->i_uid);
ri.gid = cpu_to_je16(inode->i_gid);
ri.uid = cpu_to_je16(i_uid_read(inode));
ri.gid = cpu_to_je16(i_gid_read(inode));
ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs));
ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds());
ri.offset = cpu_to_je32(inode->i_size);
@ -283,8 +283,8 @@ static int jffs2_write_end(struct file *filp, struct address_space *mapping,
/* Set the fields that the generic jffs2_write_inode_range() code can't find */
ri->ino = cpu_to_je32(inode->i_ino);
ri->mode = cpu_to_jemode(inode->i_mode);
ri->uid = cpu_to_je16(inode->i_uid);
ri->gid = cpu_to_je16(inode->i_gid);
ri->uid = cpu_to_je16(i_uid_read(inode));
ri->gid = cpu_to_je16(i_gid_read(inode));
ri->isize = cpu_to_je32((uint32_t)inode->i_size);
ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds());

24
fs/jffs2/fs.c
View File

@ -99,8 +99,10 @@ int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
ri->ino = cpu_to_je32(inode->i_ino);
ri->version = cpu_to_je32(++f->highest_version);
ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid);
ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid);
ri->uid = cpu_to_je16((ivalid & ATTR_UID)?
from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode));
ri->gid = cpu_to_je16((ivalid & ATTR_GID)?
from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode));
if (ivalid & ATTR_MODE)
ri->mode = cpu_to_jemode(iattr->ia_mode);
@ -147,8 +149,8 @@ int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
inode->i_ctime = ITIME(je32_to_cpu(ri->ctime));
inode->i_mtime = ITIME(je32_to_cpu(ri->mtime));
inode->i_mode = jemode_to_cpu(ri->mode);
inode->i_uid = je16_to_cpu(ri->uid);
inode->i_gid = je16_to_cpu(ri->gid);
i_uid_write(inode, je16_to_cpu(ri->uid));
i_gid_write(inode, je16_to_cpu(ri->gid));
old_metadata = f->metadata;
@ -276,8 +278,8 @@ struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
return ERR_PTR(ret);
}
inode->i_mode = jemode_to_cpu(latest_node.mode);
inode->i_uid = je16_to_cpu(latest_node.uid);
inode->i_gid = je16_to_cpu(latest_node.gid);
i_uid_write(inode, je16_to_cpu(latest_node.uid));
i_gid_write(inode, je16_to_cpu(latest_node.gid));
inode->i_size = je32_to_cpu(latest_node.isize);
inode->i_atime = ITIME(je32_to_cpu(latest_node.atime));
inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime));
@ -440,14 +442,14 @@ struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_r
memset(ri, 0, sizeof(*ri));
/* Set OS-specific defaults for new inodes */
ri->uid = cpu_to_je16(current_fsuid());
ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid()));
if (dir_i->i_mode & S_ISGID) {
ri->gid = cpu_to_je16(dir_i->i_gid);
ri->gid = cpu_to_je16(i_gid_read(dir_i));
if (S_ISDIR(mode))
mode |= S_ISGID;
} else {
ri->gid = cpu_to_je16(current_fsgid());
ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid()));
}
/* POSIX ACLs have to be processed now, at least partly.
@ -467,8 +469,8 @@ struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_r
set_nlink(inode, 1);
inode->i_ino = je32_to_cpu(ri->ino);
inode->i_mode = jemode_to_cpu(ri->mode);
inode->i_gid = je16_to_cpu(ri->gid);
inode->i_uid = je16_to_cpu(ri->uid);
i_gid_write(inode, je16_to_cpu(ri->gid));
i_uid_write(inode, je16_to_cpu(ri->uid));
inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime));

4
fs/jffs2/os-linux.h
View File

@ -27,8 +27,8 @@ struct kvec;
#define JFFS2_F_I_SIZE(f) (OFNI_EDONI_2SFFJ(f)->i_size)
#define JFFS2_F_I_MODE(f) (OFNI_EDONI_2SFFJ(f)->i_mode)
#define JFFS2_F_I_UID(f) (OFNI_EDONI_2SFFJ(f)->i_uid)
#define JFFS2_F_I_GID(f) (OFNI_EDONI_2SFFJ(f)->i_gid)
#define JFFS2_F_I_UID(f) (i_uid_read(OFNI_EDONI_2SFFJ(f)))
#define JFFS2_F_I_GID(f) (i_gid_read(OFNI_EDONI_2SFFJ(f)))
#define JFFS2_F_I_RDEV(f) (OFNI_EDONI_2SFFJ(f)->i_rdev)
#define ITIME(sec) ((struct timespec){sec, 0})

1
init/Kconfig
View File

@ -935,7 +935,6 @@ config UIDGID_CONVERTED
depends on CODA_FS = n
depends on FUSE_FS = n
depends on GFS2_FS = n
depends on JFFS2_FS = n
depends on JFS_FS = n
depends on NCP_FS = n
depends on NFSD = n