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Date:   Thu, 27 Oct 2022 07:26:18 -0500
From:   Dimitri Sivanich <sivanich@hpe.com>
To:     Zheng Wang <zyytlz.wz@163.com>
Cc:     gregkh@linuxfoundation.org, zhengyejian1@huawei.com,
        dimitri.sivanich@hpe.com, arnd@arndb.de,
        linux-kernel@vger.kernel.org, hackerzheng666@gmail.com,
        alex000young@gmail.com, security@kernel.org, lkp@intel.com
Subject: Re: [PATCH v6] misc: sgi-gru: fix use-after-free error in
  gru_set_context_option, gru_fault and gru_handle_user_call_os
Message-ID: <20221027122618.GA27734@hpe.com>
References: <20221027071453.118394-1-zyytlz.wz@163.com>
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Acked-by: Dimitri Sivanich <sivanich@hpe.com>

On Thu, Oct 27, 2022 at 03:14:53PM +0800, Zheng Wang wrote:
> Gts may be freed in gru_check_chiplet_assignment.
> The caller still use it after that, UAF happens.
> 
> Fix it by introducing a return value to see if it's in error path or not.
> Free the gts in caller if gru_check_chiplet_assignment check failed.
> 
> Fixes: 55484c45dbec ("gru: allow users to specify gru chiplet 2")
> Reported-by: Zheng Wang <hackerzheng666@gmail.com>
> Reported-by: kernel test robot <lkp@intel.com>
> 
> Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
> ---
> v6:
> - remove unused var checked by kernel test robot
> 
> v5:
> - fix logical issue and remove unnecessary variable suggested by Dimitri Sivanich
> 
> v4:
> - use VM_FAULT_NOPAGE as failure code in gru_fault and -EINVAL in other functions suggested by Yejian
> 
> v3:
> - add preempt_enable and use VM_FAULT_NOPAGE as failure code suggested by Yejian
> 
> v2:
> - commit message changes suggested by Greg
> 
> v1: https://lore.kernel.org/lkml/CAJedcCzY72jqgF-pCPtx66vXXwdPn-KMagZnqrxcpWw1NxTLaA@mail.gmail.com/
> ---
>  drivers/misc/sgi-gru/grufault.c  | 14 ++++++++++++--
>  drivers/misc/sgi-gru/grumain.c   | 16 ++++++++++++----
>  drivers/misc/sgi-gru/grutables.h |  2 +-
>  3 files changed, 25 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
> index d7ef61e602ed..bdd515d33225 100644
> --- a/drivers/misc/sgi-gru/grufault.c
> +++ b/drivers/misc/sgi-gru/grufault.c
> @@ -656,7 +656,9 @@ int gru_handle_user_call_os(unsigned long cb)
>  	if (ucbnum >= gts->ts_cbr_au_count * GRU_CBR_AU_SIZE)
>  		goto exit;
>  
> -	gru_check_context_placement(gts);
> +	ret = gru_check_context_placement(gts);
> +	if (ret)
> +		goto err;
>  
>  	/*
>  	 * CCH may contain stale data if ts_force_cch_reload is set.
> @@ -677,6 +679,10 @@ int gru_handle_user_call_os(unsigned long cb)
>  exit:
>  	gru_unlock_gts(gts);
>  	return ret;
> +err:
> +	gru_unlock_gts(gts);
> +	gru_unload_context(gts, 1);
> +	return -EINVAL;
>  }
>  
>  /*
> @@ -874,7 +880,11 @@ int gru_set_context_option(unsigned long arg)
>  		} else {
>  			gts->ts_user_blade_id = req.val1;
>  			gts->ts_user_chiplet_id = req.val0;
> -			gru_check_context_placement(gts);
> +			if (gru_check_context_placement(gts)) {
> +				gru_unlock_gts(gts);
> +				gru_unload_context(gts, 1);
> +				return -EINVAL;
> +			}
>  		}
>  		break;
>  	case sco_gseg_owner:
> diff --git a/drivers/misc/sgi-gru/grumain.c b/drivers/misc/sgi-gru/grumain.c
> index 9afda47efbf2..beba69fc3cd7 100644
> --- a/drivers/misc/sgi-gru/grumain.c
> +++ b/drivers/misc/sgi-gru/grumain.c
> @@ -716,9 +716,10 @@ static int gru_check_chiplet_assignment(struct gru_state *gru,
>   * chiplet. Misassignment can occur if the process migrates to a different
>   * blade or if the user changes the selected blade/chiplet.
>   */
> -void gru_check_context_placement(struct gru_thread_state *gts)
> +int gru_check_context_placement(struct gru_thread_state *gts)
>  {
>  	struct gru_state *gru;
> +	int ret = 0;
>  
>  	/*
>  	 * If the current task is the context owner, verify that the
> @@ -727,14 +728,16 @@ void gru_check_context_placement(struct gru_thread_state *gts)
>  	 */
>  	gru = gts->ts_gru;
>  	if (!gru || gts->ts_tgid_owner != current->tgid)
> -		return;
> +		return ret;
>  
>  	if (!gru_check_chiplet_assignment(gru, gts)) {
>  		STAT(check_context_unload);
> -		gru_unload_context(gts, 1);
> +		ret = -EINVAL;
>  	} else if (gru_retarget_intr(gts)) {
>  		STAT(check_context_retarget_intr);
>  	}
> +
> +	return ret;
>  }
>  
>  
> @@ -934,7 +937,12 @@ vm_fault_t gru_fault(struct vm_fault *vmf)
>  	mutex_lock(&gts->ts_ctxlock);
>  	preempt_disable();
>  
> -	gru_check_context_placement(gts);
> +	if (gru_check_context_placement(gts)) {
> +		preempt_enable();
> +		mutex_unlock(&gts->ts_ctxlock);
> +		gru_unload_context(gts, 1);
> +		return VM_FAULT_NOPAGE;
> +	}
>  
>  	if (!gts->ts_gru) {
>  		STAT(load_user_context);
> diff --git a/drivers/misc/sgi-gru/grutables.h b/drivers/misc/sgi-gru/grutables.h
> index 5efc869fe59a..f4a5a787685f 100644
> --- a/drivers/misc/sgi-gru/grutables.h
> +++ b/drivers/misc/sgi-gru/grutables.h
> @@ -632,7 +632,7 @@ extern int gru_user_flush_tlb(unsigned long arg);
>  extern int gru_user_unload_context(unsigned long arg);
>  extern int gru_get_exception_detail(unsigned long arg);
>  extern int gru_set_context_option(unsigned long address);
> -extern void gru_check_context_placement(struct gru_thread_state *gts);
> +extern int gru_check_context_placement(struct gru_thread_state *gts);
>  extern int gru_cpu_fault_map_id(void);
>  extern struct vm_area_struct *gru_find_vma(unsigned long vaddr);
>  extern void gru_flush_all_tlb(struct gru_state *gru);
> -- 
> 2.25.1