Commit 65e4308d authored by Trond Myklebust's avatar Trond Myklebust Committed by Linus Torvalds
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[PATCH] NFS: Ensure we always update inode->i_mode when doing O_EXCL creates

When the client performs an exclusive create and opens the file for writing,
a Netapp filer will first create the file using the mode 01777. It does this
since an NFSv3/v4 exclusive create cannot immediately set the mode bits.
The 01777 mode then gets put into the inode->i_mode. After the file creation
is successful, we then do a setattr to change the mode to the correct value
(as per the NFS spec).

The problem is that nfs_refresh_inode() no longer updates inode->i_mode, so
the latter retains the 01777 mode. A bit later, the VFS notices this, and calls
remove_suid(). This of course now resets the file mode to inode->i_mode & 0777.
Hey presto, the file mode on the server is now magically changed to 0777. Duh...

Fixes http://bugzilla.linux-nfs.org/show_bug.cgi?id=32

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 367ae3cd
......@@ -814,28 +814,39 @@ nfs_setattr(struct dentry *dentry, struct iattr *attr)
nfs_wb_all(inode);
}
error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
if (error == 0) {
if (error == 0)
nfs_refresh_inode(inode, &fattr);
nfs_end_data_update(inode);
unlock_kernel();
return error;
}
/**
* nfs_setattr_update_inode - Update inode metadata after a setattr call.
* @inode: pointer to struct inode
* @attr: pointer to struct iattr
*
* Note: we do this in the *proc.c in order to ensure that
* it works for things like exclusive creates too.
*/
void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
{
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
if ((attr->ia_valid & ATTR_MODE) != 0) {
int mode;
mode = inode->i_mode & ~S_IALLUGO;
mode |= attr->ia_mode & S_IALLUGO;
int mode = attr->ia_mode & S_IALLUGO;
mode |= inode->i_mode & ~S_IALLUGO;
inode->i_mode = mode;
}
if ((attr->ia_valid & ATTR_UID) != 0)
inode->i_uid = attr->ia_uid;
if ((attr->ia_valid & ATTR_GID) != 0)
inode->i_gid = attr->ia_gid;
if ((attr->ia_valid & ATTR_SIZE) != 0) {
inode->i_size = attr->ia_size;
vmtruncate(inode, attr->ia_size);
}
}
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
nfs_end_data_update(inode);
unlock_kernel();
return error;
}
if ((attr->ia_valid & ATTR_SIZE) != 0) {
inode->i_size = attr->ia_size;
vmtruncate(inode, attr->ia_size);
}
}
/*
......
......@@ -120,6 +120,8 @@ nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
dprintk("NFS call setattr\n");
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(inode), NFS3PROC_SETATTR, &arg, fattr, 0);
if (status == 0)
nfs_setattr_update_inode(inode, sattr);
dprintk("NFS reply setattr: %d\n", status);
return status;
}
......@@ -370,6 +372,8 @@ again:
* not sure this buys us anything (and I'd have
* to revamp the NFSv3 XDR code) */
status = nfs3_proc_setattr(dentry, &fattr, sattr);
if (status == 0)
nfs_setattr_update_inode(dentry->d_inode, sattr);
nfs_refresh_inode(dentry->d_inode, &fattr);
dprintk("NFS reply setattr (post-create): %d\n", status);
}
......
......@@ -753,6 +753,7 @@ static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
.rpc_argp = &arg,
.rpc_resp = &res,
};
int status;
fattr->valid = 0;
......@@ -762,7 +763,8 @@ static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
} else
memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
return rpc_call_sync(server->client, &msg, 0);
status = rpc_call_sync(server->client, &msg, 0);
return status;
}
static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
......@@ -1145,6 +1147,8 @@ nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
NFS_FH(inode), sattr, state);
if (status == 0)
nfs_setattr_update_inode(inode, sattr);
if (state != NULL)
nfs4_close_state(state, FMODE_WRITE);
put_rpccred(cred);
......@@ -1449,8 +1453,10 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
struct nfs_fattr fattr;
status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
NFS_FH(state->inode), sattr, state);
if (status == 0)
if (status == 0) {
nfs_setattr_update_inode(state->inode, sattr);
goto out;
}
} else if (flags != 0)
goto out;
nfs4_close_state(state, flags);
......
......@@ -114,6 +114,8 @@ nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
dprintk("NFS call setattr\n");
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(inode), NFSPROC_SETATTR, &arg, fattr, 0);
if (status == 0)
nfs_setattr_update_inode(inode, sattr);
dprintk("NFS reply setattr: %d\n", status);
return status;
}
......
......@@ -292,6 +292,7 @@ extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
extern int nfs_setattr(struct dentry *, struct iattr *);
extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
extern void nfs_begin_attr_update(struct inode *);
extern void nfs_end_attr_update(struct inode *);
extern void nfs_begin_data_update(struct inode *);
......
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