[PATCH 6.6 040/102] smb: client: parse owner/group when creating reparse points

Greg Kroah-Hartman
2024-05-23T13:24:11Z

From: Steve French <stfrench@microsoft.com>

[ Upstream commit 858e74876c5cbff1dfd5bace99e32fbce2abd4b5 ]

Parse owner/group when creating special files and symlinks under
SMB3.1.1 POSIX mounts.

Move the parsing of owner/group to smb2_compound_op() so we don't have
to duplicate it in both smb2_get_reparse_inode() and
smb311_posix_query_path_info().

Signed-off-by: Paulo Alcantara <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/smb/client/cifsglob.h | 2 +
fs/smb/client/inode.c | 25 +++-----
fs/smb/client/smb2inode.c | 130 ++++++++++++++++++--------------------
fs/smb/client/smb2proto.h | 4 +-
4 files changed, 71 insertions(+), 90 deletions(-)

diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index 181e9d5b10f92..678a9c671cdcd 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -209,6 +209,8 @@ struct cifs_open_info_data {
};
} reparse;
char *symlink_target;
+ struct cifs_sid posix_owner;
+ struct cifs_sid posix_group;
union {
struct smb2_file_all_info fi;
struct smb311_posix_qinfo posix_fi;
diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c
index b8260ace2bee9..0110589acb853 100644
--- a/fs/smb/client/inode.c
+++ b/fs/smb/client/inode.c
@@ -666,8 +666,6 @@ static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
/* Fill a cifs_fattr struct with info from POSIX info struct */
static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr,
struct cifs_open_info_data *data,
- struct cifs_sid *owner,
- struct cifs_sid *group,
struct super_block *sb)
{
struct smb311_posix_qinfo *info = &data->posix_fi;
@@ -723,8 +721,8 @@ static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr,
fattr->cf_symlink_target = data->symlink_target;
data->symlink_target = NULL;
}
- sid_to_id(cifs_sb, owner, fattr, SIDOWNER);
- sid_to_id(cifs_sb, group, fattr, SIDGROUP);
+ sid_to_id(cifs_sb, &data->posix_owner, fattr, SIDOWNER);
+ sid_to_id(cifs_sb, &data->posix_group, fattr, SIDGROUP);

cifs_dbg(FYI, "POSIX query info: mode 0x%x uniqueid 0x%llx nlink %d\n",
fattr->cf_mode, fattr->cf_uniqueid, fattr->cf_nlink);
@@ -1071,9 +1069,7 @@ static int reparse_info_to_fattr(struct cifs_open_info_data *data,
const unsigned int xid,
struct cifs_tcon *tcon,
const char *full_path,
- struct cifs_fattr *fattr,
- struct cifs_sid *owner,
- struct cifs_sid *group)
+ struct cifs_fattr *fattr)
{
struct TCP_Server_Info *server = tcon->ses->server;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
@@ -1118,7 +1114,7 @@ static int reparse_info_to_fattr(struct cifs_open_info_data *data,
}

if (tcon->posix_extensions)
- smb311_posix_info_to_fattr(fattr, data, owner, group, sb);
+ smb311_posix_info_to_fattr(fattr, data, sb);
else
cifs_open_info_to_fattr(fattr, data, sb);
out:
@@ -1172,8 +1168,7 @@ static int cifs_get_fattr(struct cifs_open_info_data *data,
*/
if (cifs_open_data_reparse(data)) {
rc = reparse_info_to_fattr(data, sb, xid, tcon,
- full_path, fattr,
- NULL, NULL);
+ full_path, fattr);
} else {
cifs_open_info_to_fattr(fattr, data, sb);
}
@@ -1321,7 +1316,6 @@ static int smb311_posix_get_fattr(struct cifs_open_info_data *data,
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_tcon *tcon;
struct tcon_link *tlink;
- struct cifs_sid owner, group;
int tmprc;
int rc = 0;

@@ -1335,8 +1329,7 @@ static int smb311_posix_get_fattr(struct cifs_open_info_data *data,
*/
if (!data) {
rc = smb311_posix_query_path_info(xid, tcon, cifs_sb,
- full_path, &tmp_data,
- &owner, &group);
+ full_path, &tmp_data);
data = &tmp_data;
}

@@ -1348,11 +1341,9 @@ static int smb311_posix_get_fattr(struct cifs_open_info_data *data,
case 0:
if (cifs_open_data_reparse(data)) {
rc = reparse_info_to_fattr(data, sb, xid, tcon,
- full_path, fattr,
- &owner, &group);
+ full_path, fattr);
} else {
- smb311_posix_info_to_fattr(fattr, data,
- &owner, &group, sb);
+ smb311_posix_info_to_fattr(fattr, data, sb);
}
break;
case -EREMOTE:
diff --git a/fs/smb/client/smb2inode.c b/fs/smb/client/smb2inode.c
index 94df328a1965d..4cd4b8a63316d 100644
--- a/fs/smb/client/smb2inode.c
+++ b/fs/smb/client/smb2inode.c
@@ -56,6 +56,35 @@ static struct reparse_data_buffer *reparse_buf_ptr(struct kvec *iov)
return buf;
}

+/* Parse owner and group from SMB3.1.1 POSIX query info */
+static int parse_posix_sids(struct cifs_open_info_data *data,
+ struct kvec *rsp_iov)
+{
+ struct smb2_query_info_rsp *qi = rsp_iov->iov_base;
+ unsigned int out_len = le32_to_cpu(qi->OutputBufferLength);
+ unsigned int qi_len = sizeof(data->posix_fi);
+ int owner_len, group_len;
+ u8 *sidsbuf, *sidsbuf_end;
+
+ if (out_len <= qi_len)
+ return -EINVAL;
+
+ sidsbuf = (u8 *)qi + le16_to_cpu(qi->OutputBufferOffset) + qi_len;
+ sidsbuf_end = sidsbuf + out_len - qi_len;
+
+ owner_len = posix_info_sid_size(sidsbuf, sidsbuf_end);
+ if (owner_len == -1)
+ return -EINVAL;
+
+ memcpy(&data->posix_owner, sidsbuf, owner_len);
+ group_len = posix_info_sid_size(sidsbuf + owner_len, sidsbuf_end);
+ if (group_len == -1)
+ return -EINVAL;
+
+ memcpy(&data->posix_group, sidsbuf + owner_len, group_len);
+ return 0;
+}
+
/*
* note: If cfile is passed, the reference to it is dropped here.
* So make sure that you do not reuse cfile after return from this func.
@@ -69,7 +98,6 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
__u32 desired_access, __u32 create_disposition,
__u32 create_options, umode_t mode, struct kvec *in_iov,
int *cmds, int num_cmds, struct cifsFileInfo *cfile,
- __u8 **extbuf, size_t *extbuflen,
struct kvec *out_iov, int *out_buftype)
{

@@ -509,21 +537,9 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
&rsp_iov[i + 1], sizeof(idata->posix_fi) /* add SIDs */,
(char *)&idata->posix_fi);
}
- if (rc == 0) {
- unsigned int length = le32_to_cpu(qi_rsp->OutputBufferLength);
-
- if (length > sizeof(idata->posix_fi)) {
- char *base = (char *)rsp_iov[i + 1].iov_base +
- le16_to_cpu(qi_rsp->OutputBufferOffset) +
- sizeof(idata->posix_fi);
- *extbuflen = length - sizeof(idata->posix_fi);
- *extbuf = kmemdup(base, *extbuflen, GFP_KERNEL);
- if (!*extbuf)
- rc = -ENOMEM;
- } else {
- rc = -EINVAL;
- }
- }
+ if (rc == 0)
+ rc = parse_posix_sids(idata, &rsp_iov[i + 1]);
+
SMB2_query_info_free(&rqst[num_rqst++]);
if (rc)
trace_smb3_posix_query_info_compound_err(xid, ses->Suid,
@@ -714,9 +730,8 @@ int smb2_query_path_info(const unsigned int xid,
cifs_get_readable_path(tcon, full_path, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
FILE_READ_ATTRIBUTES, FILE_OPEN,
- create_options, ACL_NO_MODE,
- in_iov, cmds, 1, cfile,
- NULL, NULL, out_iov, out_buftype);
+ create_options, ACL_NO_MODE, in_iov,
+ cmds, 1, cfile, out_iov, out_buftype);
hdr = out_iov[0].iov_base;
/*
* If first iov is unset, then SMB session was dropped or we've got a
@@ -743,8 +758,8 @@ int smb2_query_path_info(const unsigned int xid,
cifs_get_readable_path(tcon, full_path, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
FILE_READ_ATTRIBUTES, FILE_OPEN,
- create_options, ACL_NO_MODE, in_iov, cmds,
- num_cmds, cfile, NULL, NULL, NULL, NULL);
+ create_options, ACL_NO_MODE, in_iov,
+ cmds, num_cmds, cfile, NULL, NULL);
break;
case -EREMOTE:
break;
@@ -771,19 +786,13 @@ int smb311_posix_query_path_info(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const char *full_path,
- struct cifs_open_info_data *data,
- struct cifs_sid *owner,
- struct cifs_sid *group)
+ struct cifs_open_info_data *data)
{
int rc;
__u32 create_options = 0;
struct cifsFileInfo *cfile;
struct kvec in_iov[2], out_iov[3] = {};
int out_buftype[3] = {};
- __u8 *sidsbuf = NULL;
- __u8 *sidsbuf_end = NULL;
- size_t sidsbuflen = 0;
- size_t owner_len, group_len;
int cmds[2] = { SMB2_OP_POSIX_QUERY_INFO, };
int i, num_cmds;

@@ -803,8 +812,8 @@ int smb311_posix_query_path_info(const unsigned int xid,
cifs_get_readable_path(tcon, full_path, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
FILE_READ_ATTRIBUTES, FILE_OPEN,
- create_options, ACL_NO_MODE, in_iov, cmds, 1,
- cfile, &sidsbuf, &sidsbuflen, out_iov, out_buftype);
+ create_options, ACL_NO_MODE, in_iov,
+ cmds, 1, cfile, out_iov, out_buftype);
/*
* If first iov is unset, then SMB session was dropped or we've got a
* cached open file (@cfile).
@@ -831,32 +840,12 @@ int smb311_posix_query_path_info(const unsigned int xid,
cifs_get_readable_path(tcon, full_path, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
FILE_READ_ATTRIBUTES, FILE_OPEN,
- create_options, ACL_NO_MODE, in_iov, cmds,
- num_cmds, cfile, &sidsbuf, &sidsbuflen, NULL, NULL);
+ create_options, ACL_NO_MODE, in_iov,
+ cmds, num_cmds, cfile, NULL, NULL);
break;
}

out:
- if (rc == 0) {
- sidsbuf_end = sidsbuf + sidsbuflen;
-
- owner_len = posix_info_sid_size(sidsbuf, sidsbuf_end);
- if (owner_len == -1) {
- rc = -EINVAL;
- goto out;
- }
- memcpy(owner, sidsbuf, owner_len);
-
- group_len = posix_info_sid_size(
- sidsbuf + owner_len, sidsbuf_end);
- if (group_len == -1) {
- rc = -EINVAL;
- goto out;
- }
- memcpy(group, sidsbuf + owner_len, group_len);
- }
-
- kfree(sidsbuf);
for (i = 0; i < ARRAY_SIZE(out_buftype); i++)
free_rsp_buf(out_buftype[i], out_iov[i].iov_base);
return rc;
@@ -869,9 +858,9 @@ smb2_mkdir(const unsigned int xid, struct inode *parent_inode, umode_t mode,
{
return smb2_compound_op(xid, tcon, cifs_sb, name,
FILE_WRITE_ATTRIBUTES, FILE_CREATE,
- CREATE_NOT_FILE, mode, NULL,
- &(int){SMB2_OP_MKDIR}, 1,
- NULL, NULL, NULL, NULL, NULL);
+ CREATE_NOT_FILE, mode,
+ NULL, &(int){SMB2_OP_MKDIR}, 1,
+ NULL, NULL, NULL);
}

void
@@ -896,7 +885,7 @@ smb2_mkdir_setinfo(struct inode *inode, const char *name,
FILE_WRITE_ATTRIBUTES, FILE_CREATE,
CREATE_NOT_FILE, ACL_NO_MODE, &in_iov,
&(int){SMB2_OP_SET_INFO}, 1,
- cfile, NULL, NULL, NULL, NULL);
+ cfile, NULL, NULL);
if (tmprc == 0)
cifs_i->cifsAttrs = dosattrs;
}
@@ -908,8 +897,9 @@ smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
drop_cached_dir_by_name(xid, tcon, name, cifs_sb);
return smb2_compound_op(xid, tcon, cifs_sb, name,
DELETE, FILE_OPEN, CREATE_NOT_FILE,
- ACL_NO_MODE, NULL, &(int){SMB2_OP_RMDIR}, 1,
- NULL, NULL, NULL, NULL, NULL);
+ ACL_NO_MODE, NULL,
+ &(int){SMB2_OP_RMDIR}, 1,
+ NULL, NULL, NULL);
}

int
@@ -918,8 +908,9 @@ smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
{
return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
- ACL_NO_MODE, NULL, &(int){SMB2_OP_DELETE}, 1,
- NULL, NULL, NULL, NULL, NULL);
+ ACL_NO_MODE, NULL,
+ &(int){SMB2_OP_DELETE}, 1,
+ NULL, NULL, NULL);
}

static int smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
@@ -939,10 +930,9 @@ static int smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
}
in_iov.iov_base = smb2_to_name;
in_iov.iov_len = 2 * UniStrnlen((wchar_t *)smb2_to_name, PATH_MAX);
-
rc = smb2_compound_op(xid, tcon, cifs_sb, from_name, access,
- FILE_OPEN, 0, ACL_NO_MODE, &in_iov,
- &command, 1, cfile, NULL, NULL, NULL, NULL);
+ FILE_OPEN, create_options, ACL_NO_MODE,
+ &in_iov, &command, 1, cfile, NULL, NULL);
smb2_rename_path:
kfree(smb2_to_name);
return rc;
@@ -993,7 +983,7 @@ smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
FILE_WRITE_DATA, FILE_OPEN,
0, ACL_NO_MODE, &in_iov,
&(int){SMB2_OP_SET_EOF}, 1,
- cfile, NULL, NULL, NULL, NULL);
+ cfile, NULL, NULL);
}

int
@@ -1021,8 +1011,8 @@ smb2_set_file_info(struct inode *inode, const char *full_path,
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
FILE_WRITE_ATTRIBUTES, FILE_OPEN,
0, ACL_NO_MODE, &in_iov,
- &(int){SMB2_OP_SET_INFO}, 1, cfile,
- NULL, NULL, NULL, NULL);
+ &(int){SMB2_OP_SET_INFO}, 1,
+ cfile, NULL, NULL);
cifs_put_tlink(tlink);
return rc;
}
@@ -1057,7 +1047,7 @@ struct inode *smb2_get_reparse_inode(struct cifs_open_info_data *data,
cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
da, cd, co, ACL_NO_MODE, in_iov,
- cmds, 2, cfile, NULL, NULL, NULL, NULL);
+ cmds, 2, cfile, NULL, NULL);
if (!rc) {
rc = smb311_posix_get_inode_info(&new, full_path,
data, sb, xid);
@@ -1067,7 +1057,7 @@ struct inode *smb2_get_reparse_inode(struct cifs_open_info_data *data,
cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
da, cd, co, ACL_NO_MODE, in_iov,
- cmds, 2, cfile, NULL, NULL, NULL, NULL);
+ cmds, 2, cfile, NULL, NULL);
if (!rc) {
rc = cifs_get_inode_info(&new, full_path,
data, sb, xid, NULL);
@@ -1094,8 +1084,8 @@ int smb2_query_reparse_point(const unsigned int xid,
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
FILE_READ_ATTRIBUTES, FILE_OPEN,
OPEN_REPARSE_POINT, ACL_NO_MODE, &in_iov,
- &(int){SMB2_OP_GET_REPARSE}, 1, cfile,
- NULL, NULL, NULL, NULL);
+ &(int){SMB2_OP_GET_REPARSE}, 1,
+ cfile, NULL, NULL);
if (rc)
goto out;

diff --git a/fs/smb/client/smb2proto.h b/fs/smb/client/smb2proto.h
index 330e36c6b91f0..b3069911e9dd8 100644
--- a/fs/smb/client/smb2proto.h
+++ b/fs/smb/client/smb2proto.h
@@ -304,9 +304,7 @@ int smb311_posix_query_path_info(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const char *full_path,
- struct cifs_open_info_data *data,
- struct cifs_sid *owner,
- struct cifs_sid *group);
+ struct cifs_open_info_data *data);
int posix_info_parse(const void *beg, const void *end,
struct smb2_posix_info_parsed *out);
int posix_info_sid_size(const void *beg, const void *end);
--
2.43.0