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cifs: we do not allow changing username/password/unc/... during remount 

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2020-12-14 16:40:19 +10:00 committed by Steve French
parent d6a7878340
commit 9ccecae8d1
3 changed files with 52 additions and 5 deletions
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2
fs/cifs/cifsfs.c
View File

@ -493,7 +493,7 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
if (tcon->no_lease)
seq_puts(s, ",nolease");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
if (cifs_sb->ctx->multiuser)
seq_puts(s, ",multiuser");
else if (tcon->ses->user_name)
seq_show_option(s, "username", tcon->ses->user_name);

53
fs/cifs/fs_context.c
View File

@ -632,10 +632,51 @@ static int smb3_verify_reconfigure_ctx(struct smb3_fs_context *new_ctx,
cifs_dbg(VFS, "can not change sec during remount\n");
return -EINVAL;
}
if (new_ctx->multiuser != old_ctx->multiuser) {
cifs_dbg(VFS, "can not change multiuser during remount\n");
return -EINVAL;
}
if (new_ctx->UNC &&
(!old_ctx->UNC || strcmp(new_ctx->UNC, old_ctx->UNC))) {
cifs_dbg(VFS, "can not change UNC during remount\n");
return -EINVAL;
}
if (new_ctx->username &&
(!old_ctx->username || strcmp(new_ctx->username, old_ctx->username))) {
cifs_dbg(VFS, "can not change username during remount\n");
return -EINVAL;
}
if (new_ctx->password &&
(!old_ctx->password || strcmp(new_ctx->password, old_ctx->password))) {
cifs_dbg(VFS, "can not change password during remount\n");
return -EINVAL;
}
if (new_ctx->domainname &&
(!old_ctx->domainname || strcmp(new_ctx->domainname, old_ctx->domainname))) {
cifs_dbg(VFS, "can not change domainname during remount\n");
return -EINVAL;
}
if (new_ctx->nodename &&
(!old_ctx->nodename || strcmp(new_ctx->nodename, old_ctx->nodename))) {
cifs_dbg(VFS, "can not change nodename during remount\n");
return -EINVAL;
}
if (new_ctx->iocharset &&
(!old_ctx->iocharset || strcmp(new_ctx->iocharset, old_ctx->iocharset))) {
cifs_dbg(VFS, "can not change iocharset during remount\n");
return -EINVAL;
}
return 0;
}
#define STEAL_STRING(cifs_sb, ctx, field) \
do { \
kfree(ctx->field); \
ctx->field = cifs_sb->ctx->field; \
cifs_sb->ctx->field = NULL; \
} while (0)
static int smb3_reconfigure(struct fs_context *fc)
{
struct smb3_fs_context *ctx = smb3_fc2context(fc);
@ -648,10 +689,16 @@ static int smb3_reconfigure(struct fs_context *fc)
return rc;
/*
* Steal the UNC from the old and to be destroyed context.
* We can not change UNC/username/password/domainname/nodename/iocharset
* during reconnect so ignore what we have in the new context and
* just use what we already have in cifs_sb->ctx.
*/
ctx->UNC = cifs_sb->ctx->UNC;
cifs_sb->ctx->UNC = NULL;
STEAL_STRING(cifs_sb, ctx, UNC);
STEAL_STRING(cifs_sb, ctx, username);
STEAL_STRING(cifs_sb, ctx, password);
STEAL_STRING(cifs_sb, ctx, domainname);
STEAL_STRING(cifs_sb, ctx, nodename);
STEAL_STRING(cifs_sb, ctx, iocharset);
smb3_cleanup_fs_context_contents(cifs_sb->ctx);
rc = smb3_fs_context_dup(cifs_sb->ctx, ctx);

2
fs/cifs/fs_context.h
View File

@ -149,7 +149,6 @@ struct smb3_fs_context {
bool uid_specified;
bool gid_specified;
bool sloppy;
char *nodename;
bool got_ip;
bool got_version;
bool got_rsize;
@ -161,6 +160,7 @@ struct smb3_fs_context {
char *password;
char *domainname;
char *UNC;
char *nodename;
char *iocharset; /* local code page for mapping to and from Unicode */
char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */