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ceph: make ceph_fill_trace and ceph_get_name decrypt names

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When we get a dentry in a trace, decrypt the name so we can properly
instantiate the dentry or fill out ceph_get_name() buffer.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton 2020-08-10 15:13:29 -04:00 committed by Ilya Dryomov
parent 457117f077
commit 855290962c
2 changed files with 60 additions and 14 deletions
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44
fs/ceph/export.c
View File

@ -7,6 +7,7 @@
#include "super.h"
#include "mds_client.h"
#include "crypto.h"
/*
* Basic fh
@ -535,7 +536,9 @@ static int ceph_get_name(struct dentry *parent, char *name,
{
struct ceph_mds_client *mdsc;
struct ceph_mds_request *req;
struct inode *dir = d_inode(parent);
struct inode *inode = d_inode(child);
struct ceph_mds_reply_info_parsed *rinfo;
int err;
if (ceph_snap(inode) != CEPH_NOSNAP)
@ -547,30 +550,47 @@ static int ceph_get_name(struct dentry *parent, char *name,
if (IS_ERR(req))
return PTR_ERR(req);
inode_lock(d_inode(parent));
inode_lock(dir);
req->r_inode = inode;
ihold(inode);
req->r_ino2 = ceph_vino(d_inode(parent));
req->r_parent = d_inode(parent);
ihold(req->r_parent);
req->r_parent = dir;
ihold(dir);
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
req->r_num_caps = 2;
err = ceph_mdsc_do_request(mdsc, NULL, req);
inode_unlock(dir);
inode_unlock(d_inode(parent));
if (err)
goto out;
if (!err) {
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
rinfo = &req->r_reply_info;
if (!IS_ENCRYPTED(dir)) {
memcpy(name, rinfo->dname, rinfo->dname_len);
name[rinfo->dname_len] = 0;
dout("get_name %p ino %llx.%llx name %s\n",
child, ceph_vinop(inode), name);
} else {
dout("get_name %p ino %llx.%llx err %d\n",
child, ceph_vinop(inode), err);
}
struct fscrypt_str oname = FSTR_INIT(NULL, 0);
struct ceph_fname fname = { .dir = dir,
.name = rinfo->dname,
.ctext = rinfo->altname,
.name_len = rinfo->dname_len,
.ctext_len = rinfo->altname_len };
err = ceph_fname_alloc_buffer(dir, &oname);
if (err < 0)
goto out;
err = ceph_fname_to_usr(&fname, NULL, &oname, NULL);
if (!err) {
memcpy(name, oname.name, oname.len);
name[oname.len] = 0;
}
ceph_fname_free_buffer(dir, &oname);
}
out:
dout("get_name %p ino %llx.%llx err %d %s%s\n",
child, ceph_vinop(inode), err,
err ? "" : "name ", err ? "" : name);
ceph_mdsc_put_request(req);
return err;
}

30
fs/ceph/inode.c
View File

@ -1406,8 +1406,15 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
bool is_nokey = false;
struct qstr dname;
struct dentry *dn, *parent;
struct fscrypt_str oname = FSTR_INIT(NULL, 0);
struct ceph_fname fname = { .dir = dir,
.name = rinfo->dname,
.ctext = rinfo->altname,
.name_len = rinfo->dname_len,
.ctext_len = rinfo->altname_len };
BUG_ON(!rinfo->head->is_target);
BUG_ON(req->r_dentry);
@ -1415,8 +1422,20 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
parent = d_find_any_alias(dir);
BUG_ON(!parent);
dname.name = rinfo->dname;
dname.len = rinfo->dname_len;
err = ceph_fname_alloc_buffer(dir, &oname);
if (err < 0) {
dput(parent);
goto done;
}
err = ceph_fname_to_usr(&fname, NULL, &oname, &is_nokey);
if (err < 0) {
dput(parent);
ceph_fname_free_buffer(dir, &oname);
goto done;
}
dname.name = oname.name;
dname.len = oname.len;
dname.hash = full_name_hash(parent, dname.name, dname.len);
tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
@ -1431,9 +1450,15 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
dname.len, dname.name, dn);
if (!dn) {
dput(parent);
ceph_fname_free_buffer(dir, &oname);
err = -ENOMEM;
goto done;
}
if (is_nokey) {
spin_lock(&dn->d_lock);
dn->d_flags |= DCACHE_NOKEY_NAME;
spin_unlock(&dn->d_lock);
}
err = 0;
} else if (d_really_is_positive(dn) &&
(ceph_ino(d_inode(dn)) != tvino.ino ||
@ -1445,6 +1470,7 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
dput(dn);
goto retry_lookup;
}
ceph_fname_free_buffer(dir, &oname);
req->r_dentry = dn;
dput(parent);