hugetlb: fix hugetlb cgroup refcounting during vma split

Guillaume Morin reported hitting the following WARNING followed by GPF or
NULL pointer deference either in cgroups_destroy or in the kill_css path.:

    percpu ref (css_release) <= 0 (-1) after switching to atomic
    WARNING: CPU: 23 PID: 130 at lib/percpu-refcount.c:196 percpu_ref_switch_to_atomic_rcu+0x127/0x130
    CPU: 23 PID: 130 Comm: ksoftirqd/23 Kdump: loaded Tainted: G           O      5.10.60 #1
    RIP: 0010:percpu_ref_switch_to_atomic_rcu+0x127/0x130
    Call Trace:
       rcu_core+0x30f/0x530
       rcu_core_si+0xe/0x10
       __do_softirq+0x103/0x2a2
       run_ksoftirqd+0x2b/0x40
       smpboot_thread_fn+0x11a/0x170
       kthread+0x10a/0x140
       ret_from_fork+0x22/0x30

Upon further examination, it was discovered that the css structure was
associated with hugetlb reservations.

For private hugetlb mappings the vma points to a reserve map that
contains a pointer to the css.  At mmap time, reservations are set up
and a reference to the css is taken.  This reference is dropped in the
vma close operation; hugetlb_vm_op_close.  However, if a vma is split no
additional reference to the css is taken yet hugetlb_vm_op_close will be
called twice for the split vma resulting in an underflow.

Fix by taking another reference in hugetlb_vm_op_open.  Note that the
reference is only taken for the owner of the reserve map.  In the more
common fork case, the pointer to the reserve map is cleared for
non-owning vmas.

Link: https://lkml.kernel.org/r/20210830215015.155224-1-mike.kravetz@oracle.com
Fixes: e9fe92ae0cd2 ("hugetlb_cgroup: add reservation accounting for private mappings")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reported-by: Guillaume Morin <guillaume@morinfr.org>
Suggested-by: Guillaume Morin <guillaume@morinfr.org>
Tested-by: Guillaume Morin <guillaume@morinfr.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
index 0b8d1fd..c137396 100644 (file)
--- a/include/linux/hugetlb_cgroup.h
+++ b/include/linux/hugetlb_cgroup.h
@@ -121,6 +121,13 @@ static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
        css_put(&h_cg->css);
 }
 
+static inline void resv_map_dup_hugetlb_cgroup_uncharge_info(
+                                               struct resv_map *resv_map)
+{
+       if (resv_map->css)
+               css_get(resv_map->css);
+}
+
 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
                                        struct hugetlb_cgroup **ptr);
 extern int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
@@ -199,6 +206,11 @@ static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
 {
 }
 
+static inline void resv_map_dup_hugetlb_cgroup_uncharge_info(
+                                               struct resv_map *resv_map)
+{
+}
+
 static inline int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
                                               struct hugetlb_cgroup **ptr)
 {

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index dd1c1e7..41a1778 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4106,8 +4106,10 @@ static void hugetlb_vm_op_open(struct vm_area_struct *vma)
         * after this open call completes.  It is therefore safe to take a
         * new reference here without additional locking.
         */
-       if (resv && is_vma_resv_set(vma, HPAGE_RESV_OWNER))
+       if (resv && is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
+               resv_map_dup_hugetlb_cgroup_uncharge_info(resv);
                kref_get(&resv->refs);
+       }
 }
 
 static void hugetlb_vm_op_close(struct vm_area_struct *vma)