netdev - Re: [PATCH net 3/9] mlxsw: spectrum_acl_tcam: Fix possible use-after-free during activity update

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Date: Wed, 24 Apr 2024 15:49:16 +0100
From: Simon Horman <horms@...nel.org>
To: Petr Machata <petrm@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, Ido Schimmel <idosch@...dia.com>,
	Jiri Pirko <jiri@...nulli.us>, Alexander Zubkov <green@...tor.net>,
	mlxsw@...dia.com
Subject: Re: [PATCH net 3/9] mlxsw: spectrum_acl_tcam: Fix possible
 use-after-free during activity update

On Mon, Apr 22, 2024 at 05:25:56PM +0200, Petr Machata wrote:
> From: Ido Schimmel <idosch@...dia.com>
> 
> The rule activity update delayed work periodically traverses the list of
> configured rules and queries their activity from the device.
> 
> As part of this task it accesses the entry pointed by 'ventry->entry',
> but this entry can be changed concurrently by the rehash delayed work,
> leading to a use-after-free [1].
> 
> Fix by closing the race and perform the activity query under the
> 'vregion->lock' mutex.
> 
> [1]
> BUG: KASAN: slab-use-after-free in mlxsw_sp_acl_tcam_flower_rule_activity_get+0x121/0x140

...

> Fixes: 2bffc5322fd8 ("mlxsw: spectrum_acl: Don't take mutex in mlxsw_sp_acl_tcam_vregion_rehash_work()")
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> Tested-by: Alexander Zubkov <green@...tor.net>
> Reviewed-by: Petr Machata <petrm@...dia.com>
> Signed-off-by: Petr Machata <petrm@...dia.com>

Reviewed-by: Simon Horman <horms@...nel.org>

...