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authorEric Dumazet <edumazet@google.com>2022-02-04 14:42:35 -0800
committerDavid S. Miller <davem@davemloft.net>2022-02-05 15:22:44 +0000
commite3ececfe668facd87d920b608349a32607060e66 (patch)
tree99cee105c8bf97b641e5d1121e8a778c0c5149d3 /include/linux/ref_tracker.h
parentcc3063502e0893c491ff83b61f43d402c144857d (diff)
ref_tracker: implement use-after-free detection
Whenever ref_tracker_dir_init() is called, mark the struct ref_tracker_dir as dead. Test the dead status from ref_tracker_alloc() and ref_tracker_free() This should detect buggy dev_put()/dev_hold() happening too late in netdevice dismantle process. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/ref_tracker.h')
-rw-r--r--include/linux/ref_tracker.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ref_tracker.h b/include/linux/ref_tracker.h
index 60f3453be23e..a443abda937d 100644
--- a/include/linux/ref_tracker.h
+++ b/include/linux/ref_tracker.h
@@ -13,6 +13,7 @@ struct ref_tracker_dir {
spinlock_t lock;
unsigned int quarantine_avail;
refcount_t untracked;
+ bool dead;
struct list_head list; /* List of active trackers */
struct list_head quarantine; /* List of dead trackers */
#endif
@@ -26,6 +27,7 @@ static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir,
INIT_LIST_HEAD(&dir->quarantine);
spin_lock_init(&dir->lock);
dir->quarantine_avail = quarantine_count;
+ dir->dead = false;
refcount_set(&dir->untracked, 1);
stack_depot_init();
}