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fs: prefer kfree_rcu() in fasync_remove_entry()

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In 'fasync_remove_entry()', prefer 'kfree_rcu()' over 'call_rcu()' with dummy
'fasync_free_rcu()' callback. This is mostly intended in attempt to fix weird
https://syzkaller.appspot.com/bug?id=6a64ad907e361e49e92d1c4c114128a1bda2ed7f,
where kmemleak may consider 'fa' as unreferenced during RCU grace period. See
https://lore.kernel.org/stable/20230930174657.800551-1-joel@joelfernandes.org
as well. Comments are highly appreciated.

Ever since ae65a5211d ("mm/slab: document kfree() as allowed for
kmem_cache_alloc() objects") kfree() can be used for both kmalloc() and
kmem_cache_alloc() so this is no safe.

Do not backport this to stable, please.

Link ae65a5211d ("mm/slab: document kfree() as > allowed for kmem_cache_alloc() objects")
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Link: https://lore.kernel.org/r/20240209125220.330383-1-dmantipov@yandex.ru
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Dmitry Antipov 2024-02-09 15:52:19 +03:00 committed by Christian Brauner
parent ef560389ca
commit d0089603fa
1 changed files with 1 additions and 7 deletions
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8
fs/fcntl.c
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@ -846,12 +846,6 @@ int send_sigurg(struct fown_struct *fown)
static DEFINE_SPINLOCK(fasync_lock);
static struct kmem_cache *fasync_cache __ro_after_init;
static void fasync_free_rcu(struct rcu_head *head)
{
kmem_cache_free(fasync_cache,
container_of(head, struct fasync_struct, fa_rcu));
}
/*
* Remove a fasync entry. If successfully removed, return
* positive and clear the FASYNC flag. If no entry exists,
@ -877,7 +871,7 @@ int fasync_remove_entry(struct file *filp, struct fasync_struct **fapp)
write_unlock_irq(&fa->fa_lock);
*fp = fa->fa_next;
call_rcu(&fa->fa_rcu, fasync_free_rcu);
kfree_rcu(fa, fa_rcu);
filp->f_flags &= ~FASYNC;
result = 1;
break;