proc_fuse: add disable_uptime feature

Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
lxc · Jun 10, 2024 · e0b62ec · e0b62ec
1 parent 9e9b297
commit e0b62ec
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Showing 3 changed files with 5 additions and 0 deletions.
diff --git a/src/bindings.c b/src/bindings.c
@@ -46,6 +46,7 @@
 #define ROOTDIR "/lxcfs/root"
 
 feature_t per_instance_features[63] = {
+ { .name = "disable_uptime", },
  { }
 };
 

diff --git a/src/bindings.h b/src/bindings.h
@@ -161,6 +161,7 @@ struct pidns_store {
  /* Do not free on liblxcfs reload (contains useful persistent data) */
  bool keep_on_reload;
 
+#define LXCFS_FEATURES_DISABLE_UPTIME (1 << 0)
  /* bit mask for per-instance configuration options (on/off) */
  __u64 features;
 };

diff --git a/src/proc_fuse.c b/src/proc_fuse.c
@@ -948,6 +948,9 @@ static int proc_uptime_read(char *buf, size_t size, off_t offset,
  return total_len;
  }
 
+ if (check_set_lxcfs_feature(fc->pid, LXCFS_FEATURE_CHECK, LXCFS_FEATURES_DISABLE_UPTIME))
+ return read_file_fuse("/proc/uptime", buf, size, d);
+
  reaperage = get_reaper_age(fc->pid);
  /*
  * To understand why this is done, please read the comment to the