Re: [PATCH v3] kernel: audit.c: Add __rcu annotation to RCU pointer

On Mon, Dec 2, 2019 at 4:19 PM Joel Fernandes <joel(a)joelfernandes.org&gt; wrote: > Good idea to CC the following on RCU patches: > Paul McKenney > Steven Rostedt > (Any others on the RCU maintainers list). > And, the list: rcu(a)vger.kernel.org > > Could anyone Ack the patch? Looks safe and straight forward. FWIW, this looks reasonable to me, but I don't see this as a critical fix that needs to go in during the merge window. Unless I see any objections, I'll plan on merging this into audit/next once the merge window closes.

> On Mon, Dec 02, 2019 at 12:03:48AM +0530, Amol Grover wrote: > > Add __rcu annotation to RCU-protected global pointer auditd_conn. > > > > auditd_conn is an RCU-protected global pointer,i.e., accessed > > via RCU methods rcu_dereference() and rcu_assign_pointer(), > > hence it must be annotated with __rcu for sparse to report > > warnings/errors correctly. > > > > Fix multiple instances of the sparse error: > > error: incompatible types in comparison expression > > (different address spaces) > > > > Reviewed-by: Joel Fernandes (Google) <joel(a)joelfernandes.org&gt; > > Signed-off-by: Amol Grover <frextrite(a)gmail.com&gt; > > --- > > v3: > > - update changelog to be more descriptive > > > > v2: > > - fix erroneous RCU pointer initialization > > > > kernel/audit.c | 5 +++-- > > 1 file changed, 3 insertions(+), 2 deletions(-) > > > > diff --git a/kernel/audit.c b/kernel/audit.c > > index da8dc0db5bd3..ff7cfc61f53d 100644 > > --- a/kernel/audit.c > > +++ b/kernel/audit.c > > @@ -102,12 +102,13 @@ struct audit_net { > > * This struct is RCU protected; you must either hold the RCU lock for reading > > * or the associated spinlock for writing. > > */ > > -static struct auditd_connection { > > +struct auditd_connection { > > struct pid *pid; > > u32 portid; > > struct net *net; > > struct rcu_head rcu; > > -} *auditd_conn = NULL; > > +}; > > +static struct auditd_connection __rcu *auditd_conn; > > static DEFINE_SPINLOCK(auditd_conn_lock); > > > > /* If audit_rate_limit is non-zero, limit the rate of sending audit records > > -- > > 2.24.0 > > -- paul moore www.paul-moore.com