[xen stable-4.13] tools/xenstore: fix connection->id usage

[patchbot@xxxxxxx]

commit e84ef3b0810c3fdf4db7728c69fca2dee77084a2
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue Sep 13 07:35:08 2022 +0200
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Nov 1 15:25:15 2022 +0000

    tools/xenstore: fix connection->id usage
    
    Don't use conn->id for privilege checks, but domain_is_unprivileged().
    
    This is part of XSA-326.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
    (cherry picked from commit 3047df38e1991510bc295e3e1bb6b6b6c4a97831)
---
 tools/xenstore/xenstored_control.c     | 2 +-
 tools/xenstore/xenstored_core.h        | 2 +-
 tools/xenstore/xenstored_transaction.c | 3 ++-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/xenstore/xenstored_control.c 
b/tools/xenstore/xenstored_control.c
index e4b8aa95ab..d3272e2ef9 100644
--- a/tools/xenstore/xenstored_control.c
+++ b/tools/xenstore/xenstored_control.c
@@ -180,7 +180,7 @@ int do_control(struct connection *conn, struct 
buffered_data *in)
        int cmd;
        char **vec;
 
-       if (conn->id != 0)
+       if (domain_is_unprivileged(conn))
                return EACCES;
 
        num = xs_count_strings(in->buffer, in->used);
diff --git a/tools/xenstore/xenstored_core.h b/tools/xenstore/xenstored_core.h
index 1eb6131fc8..98db4afcaa 100644
--- a/tools/xenstore/xenstored_core.h
+++ b/tools/xenstore/xenstored_core.h
@@ -93,7 +93,7 @@ struct connection
        /* The index of pollfd in global pollfd array */
        int pollfd_idx;
 
-       /* Who am I? 0 for socket connections. */
+       /* Who am I? Domid of connection. */
        unsigned int id;
 
        /* Is this a read-only connection? */
diff --git a/tools/xenstore/xenstored_transaction.c 
b/tools/xenstore/xenstored_transaction.c
index 6fbdb29dcd..9bef6e72a5 100644
--- a/tools/xenstore/xenstored_transaction.c
+++ b/tools/xenstore/xenstored_transaction.c
@@ -483,7 +483,8 @@ int do_transaction_start(struct connection *conn, struct 
buffered_data *in)
        if (conn->transaction)
                return EBUSY;
 
-       if (conn->id && conn->transaction_started > quota_max_transaction)
+       if (domain_is_unprivileged(conn) &&
+           conn->transaction_started > quota_max_transaction)
                return ENOSPC;
 
        /* Attach transaction to input for autofree until it's complete */
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.13