From: Al Viro <viro@zeniv.linux.org.uk>
To: ritu pal <ritupal888@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Christian Brauner <brauner@kernel.org>,
NeilBrown <neil@brown.name>, Chen Ni <nichen@iscas.ac.cn>
Subject: Re: ipc/mqueue: release spinlock before freeing node_cache in mqueue_evict_inode()
Date: Thu, 3 Jul 2025 09:10:51 +0100 [thread overview]
Message-ID: <20250703081051.GK1880847@ZenIV> (raw)
In-Reply-To: <CAEy91+Z=8+MsK10uiMiAf0k-EWSd3-o33yfckc3tsEz7pvmjVA@mail.gmail.com>
On Thu, Jul 03, 2025 at 01:34:39PM +0530, ritu pal wrote:
> > That spinlock is inside the inode in question; what exactly is going to be
> > on the other side of contention? Note that none of the file methods
> > are going to run concurrent with that...
>
> Another thread that's waiting to acquire the spinlock to process the
> next item in the mqueue.
> This change reduces the hold time of "info->lock", since the kfree()
> of the node_cache does not require a spinlock to be held.
Describe the call chain in that other thread, please. If there is one,
you've got a UAF scenario.
next prev parent reply other threads:[~2025-07-03 8:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAEy91+YpzU5tKEfsjt1_Hh0fsiCfVVK099EztXOPFGHFYyA1KQ@mail.gmail.com>
2025-06-27 16:37 ` ipc/mqueue: release spinlock before freeing node_cache in mqueue_evict_inode() Al Viro
2025-07-03 8:04 ` ritu pal
2025-07-03 8:10 ` Al Viro [this message]
2025-06-27 12:46 ritu pal
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