The following commit has been merged into the x86/cache branch of tip:
Commit-ID: 587edd7069b9e7dc7993d2df9371e7c37a4d2133
Gitweb: https://git.kernel.org/tip/587edd7069b9e7dc7993d2df9371e7c37a4d2133
Author: Tony Luck <tony.luck@xxxxxxxxx>
AuthorDate: Fri, 28 Jun 2024 14:56:10 -07:00
Committer: Borislav Petkov (AMD) <bp@xxxxxxxxx>
CommitterDate: Tue, 02 Jul 2024 19:49:54 +02:00
x86/resctrl: Initialize on-stack struct rmid_read instances
New semantics rely on some struct rmid_read members having NULL values to
distinguish between the SNC and non-SNC scenarios. resctrl can thus no longer
rely on this struct not being initialized properly.
Initialize all on-stack declarations of struct rmid_read:
rdtgroup_mondata_show()
mbm_update()
mkdir_mondata_subdir()
to ensure that garbage values from the stack are not passed down to other
functions.
[ bp: Massage commit message. ]
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Tested-by: Babu Moger <babu.moger@xxxxxxx>
Link: https://lore.kernel.org/r/20240628215619.76401-11-tony.luck@xxxxxxxxx
---
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 3 +--
arch/x86/kernel/cpu/resctrl/monitor.c | 3 +--
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 2 +-
3 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 3b93836..4d76ff3 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -529,7 +529,6 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
rr->evtid = evtid;
rr->r = r;
rr->d = d;
- rr->val = 0;
rr->first = first;
rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
if (IS_ERR(rr->arch_mon_ctx)) {
@@ -557,12 +556,12 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
{
struct kernfs_open_file *of = m->private;
struct rdt_domain_hdr *hdr;
+ struct rmid_read rr = {0};
struct rdt_mon_domain *d;
u32 resid, evtid, domid;
struct rdtgroup *rdtgrp;
struct rdt_resource *r;
union mon_data_bits md;
- struct rmid_read rr;
int ret = 0;
rdtgrp = rdtgroup_kn_lock_live(of->kn);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index ff4e745..ca309c9 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -780,9 +780,8 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_mon_domain *dom_mbm)
static void mbm_update(struct rdt_resource *r, struct rdt_mon_domain *d,
u32 closid, u32 rmid)
{
- struct rmid_read rr;
+ struct rmid_read rr = {0};
- rr.first = false;
rr.r = r;
rr.d = d;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 70d41a8..d044358 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3029,10 +3029,10 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
struct rdt_mon_domain *d,
struct rdt_resource *r, struct rdtgroup *prgrp)
{
+ struct rmid_read rr = {0};
union mon_data_bits priv;
struct kernfs_node *kn;
struct mon_evt *mevt;
- struct rmid_read rr;
char name[32];
int ret;
|