From: Shannon Sterz <s.sterz@proxmox.com>
To: pbs-devel@lists.proxmox.com
Subject: [pbs-devel] [PATCH proxmox-backup 4/4] fix: api: avoid race condition in set_backup_owner
Date: Mon, 10 Mar 2025 15:36:07 +0100 [thread overview]
Message-ID: <20250310143607.298339-5-s.sterz@proxmox.com> (raw)
In-Reply-To: <20250310143607.298339-1-s.sterz@proxmox.com>
when two clients change the owner of a backup store, a race condition
arose. add locking to avoid this.
Signed-off-by: Shannon Sterz <s.sterz@proxmox.com>
---
src/api2/admin/datastore.rs | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/src/api2/admin/datastore.rs b/src/api2/admin/datastore.rs
index cfe319c4..b16e609a 100644
--- a/src/api2/admin/datastore.rs
+++ b/src/api2/admin/datastore.rs
@@ -2347,10 +2347,9 @@ pub async fn set_backup_owner(
let datastore = DataStore::lookup_datastore(&store, Some(Operation::Write))?;
let backup_group = datastore.backup_group(ns, backup_group);
+ let owner = backup_group.get_owner()?;
if owner_check_required {
- let owner = backup_group.get_owner()?;
-
let allowed = match (owner.is_token(), new_owner.is_token()) {
(true, true) => {
// API token to API token, owned by same user
@@ -2397,6 +2396,12 @@ pub async fn set_backup_owner(
);
}
+ let _guard = backup_group.lock()?;
+
+ if owner != backup_group.get_owner()? {
+ bail!("{owner} does not own this group anymore");
+ }
+
backup_group.set_owner(&new_owner, true)?;
Ok(())
--
2.39.5
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prev parent reply other threads:[~2025-03-10 14:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-10 14:36 [pbs-devel] [PATCH proxmox-backup 0/4] refactor datastore locking to use tmpfs Shannon Sterz
2025-03-10 14:36 ` [pbs-devel] [PATCH proxmox-backup 1/4] datastore/api/backup: prepare for fix of #3935 by adding lock helpers Shannon Sterz
2025-03-10 14:36 ` [pbs-devel] [PATCH proxmox-backup 2/4] fix #3935: datastore/api/backup: move datastore locking to '/run' Shannon Sterz
2025-03-10 14:36 ` [pbs-devel] [PATCH proxmox-backup 3/4] fix #3935: datastore: move manifest locking to new locking method Shannon Sterz
2025-03-10 14:36 ` Shannon Sterz [this message]
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