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Message-ID: <09d01980-aedf-f62b-4729-2a30c422cf63@opensource.wdc.com>
Date: Thu, 10 Feb 2022 20:46:07 +0900
From: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To: John Garry <john.garry@...wei.com>, jejb@...ux.ibm.com,
martin.petersen@...cle.com, artur.paszkiewicz@...el.com,
jinpu.wang@...ud.ionos.com
Cc: chenxiang66@...ilicon.com, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org, linuxarm@...wei.com, hch@....de
Subject: Re: [PATCH 2/2] scsi: libsas: Drop SAS_TASK_AT_INITIATOR
On 2/10/22 19:43, John Garry wrote:
> This flag is now only ever set, so delete it.
>
> This also avoids a use-after-free in the pm8001 queue path, as reported
> in the following:
> https://lore.kernel.org/linux-scsi/c3cb7228-254e-9584-182b-007ac5e6fe0a@huawei.com/T/#m28c94c6d3ff582ec4a9fa54819180740e8bd4cfb
> https://lore.kernel.org/linux-scsi/0cc0c435-b4f2-9c76-258d-865ba50a29dd@huawei.com/
>
> Signed-off-by: John Garry <john.garry@...wei.com>
No mor use-after-free, finally :)
Reviewed-by: Damien Le Moal <damien.lemoal@....com>
> ---
> drivers/scsi/aic94xx/aic94xx_task.c | 9 ---------
> drivers/scsi/hisi_sas/hisi_sas_main.c | 8 +-------
> drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 3 +--
> drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 3 +--
> drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 3 +--
> drivers/scsi/isci/request.c | 3 +--
> drivers/scsi/isci/task.c | 10 +++-------
> drivers/scsi/mvsas/mv_sas.c | 6 +-----
> drivers/scsi/pm8001/pm8001_hwi.c | 7 -------
> drivers/scsi/pm8001/pm8001_sas.c | 4 ----
> drivers/scsi/pm8001/pm80xx_hwi.c | 5 -----
> include/scsi/libsas.h | 1 -
> 12 files changed, 9 insertions(+), 53 deletions(-)
>
> diff --git a/drivers/scsi/aic94xx/aic94xx_task.c b/drivers/scsi/aic94xx/aic94xx_task.c
> index c6b63eae28f5..ed119a3f6f2e 100644
> --- a/drivers/scsi/aic94xx/aic94xx_task.c
> +++ b/drivers/scsi/aic94xx/aic94xx_task.c
> @@ -322,7 +322,6 @@ static void asd_task_tasklet_complete(struct asd_ascb *ascb,
>
> spin_lock_irqsave(&task->task_state_lock, flags);
> task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> struct completion *completion = ascb->completion;
> @@ -532,7 +531,6 @@ int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
> struct sas_task *t = task;
> struct asd_ascb *ascb = NULL, *a;
> struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
> - unsigned long flags;
>
> res = asd_can_queue(asd_ha, 1);
> if (res)
> @@ -575,10 +573,6 @@ int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
> }
> if (res)
> goto out_err_unmap;
> -
> - spin_lock_irqsave(&t->task_state_lock, flags);
> - t->task_state_flags |= SAS_TASK_AT_INITIATOR;
> - spin_unlock_irqrestore(&t->task_state_lock, flags);
> }
> list_del_init(&alist);
>
> @@ -597,9 +591,6 @@ int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
> if (a == b)
> break;
> t = a->uldd_task;
> - spin_lock_irqsave(&t->task_state_lock, flags);
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> - spin_unlock_irqrestore(&t->task_state_lock, flags);
> switch (t->task_proto) {
> case SAS_PROTOCOL_SATA:
> case SAS_PROTOCOL_STP:
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
> index ebf5ec38891b..1873707ca599 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_main.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
> @@ -405,7 +405,6 @@ void hisi_sas_task_deliver(struct hisi_hba *hisi_hba,
> struct hisi_sas_cmd_hdr *cmd_hdr_base;
> int dlvry_queue_slot, dlvry_queue;
> struct sas_task *task = slot->task;
> - unsigned long flags;
> int wr_q_index;
>
> spin_lock(&dq->lock);
> @@ -457,10 +456,6 @@ void hisi_sas_task_deliver(struct hisi_hba *hisi_hba,
> break;
> }
>
> - spin_lock_irqsave(&task->task_state_lock, flags);
> - task->task_state_flags |= SAS_TASK_AT_INITIATOR;
> - spin_unlock_irqrestore(&task->task_state_lock, flags);
> -
> WRITE_ONCE(slot->ready, 1);
>
> spin_lock(&dq->lock);
> @@ -1035,8 +1030,7 @@ static void hisi_sas_do_release_task(struct hisi_hba *hisi_hba, struct sas_task
> ts->resp = SAS_TASK_COMPLETE;
> ts->stat = SAS_ABORTED_TASK;
> spin_lock_irqsave(&task->task_state_lock, flags);
> - task->task_state_flags &=
> - ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
> + task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> if (!slot->is_internal && task->task_proto != SAS_PROTOCOL_SMP)
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> spin_unlock_irqrestore(&task->task_state_lock, flags);
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
> index 3059d19e4368..6914e992a02e 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
> @@ -1200,8 +1200,7 @@ static void slot_complete_v1_hw(struct hisi_hba *hisi_hba,
> sas_dev = device->lldd_dev;
>
> spin_lock_irqsave(&task->task_state_lock, flags);
> - task->task_state_flags &=
> - ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
> + task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> spin_unlock_irqrestore(&task->task_state_lock, flags);
>
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> index 64ed3e472e65..eaaf9e8b4ca4 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> @@ -2344,8 +2344,7 @@ static void slot_complete_v2_hw(struct hisi_hba *hisi_hba,
> sas_dev = device->lldd_dev;
>
> spin_lock_irqsave(&task->task_state_lock, flags);
> - task->task_state_flags &=
> - ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
> + task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> spin_unlock_irqrestore(&task->task_state_lock, flags);
>
> memset(ts, 0, sizeof(*ts));
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> index a01a3a7b706b..52e306c1ece2 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> @@ -2217,8 +2217,7 @@ static void slot_complete_v3_hw(struct hisi_hba *hisi_hba,
> sas_dev = device->lldd_dev;
>
> spin_lock_irqsave(&task->task_state_lock, flags);
> - task->task_state_flags &=
> - ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
> + task->task_state_flags &= ~SAS_TASK_STATE_PENDING ;
> spin_unlock_irqrestore(&task->task_state_lock, flags);
>
> memset(ts, 0, sizeof(*ts));
> diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
> index b48ec64f745a..b45e4e81dd19 100644
> --- a/drivers/scsi/isci/request.c
> +++ b/drivers/scsi/isci/request.c
> @@ -2934,8 +2934,7 @@ static void isci_request_io_request_complete(struct isci_host *ihost,
> if (test_bit(IREQ_COMPLETE_IN_TARGET, &request->flags)) {
> /* Normal notification (task_done) */
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> - task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
> - SAS_TASK_STATE_PENDING);
> + task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> }
> spin_unlock_irqrestore(&task->task_state_lock, task_flags);
>
> diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c
> index 14738702d4c9..c82d07978532 100644
> --- a/drivers/scsi/isci/task.c
> +++ b/drivers/scsi/isci/task.c
> @@ -91,8 +91,7 @@ static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task,
>
> /* Normal notification (task_done) */
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> - task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
> - SAS_TASK_STATE_PENDING);
> + task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> task->lldd_task = NULL;
> spin_unlock_irqrestore(&task->task_state_lock, flags);
>
> @@ -164,7 +163,6 @@ int isci_task_execute_task(struct sas_task *task, gfp_t gfp_flags)
> } else {
> struct isci_request *ireq;
>
> - task->task_state_flags |= SAS_TASK_AT_INITIATOR;
> /* do common allocation and init of request object. */
> ireq = isci_io_request_from_tag(ihost, task, tag);
> spin_unlock_irqrestore(&task->task_state_lock, flags);
> @@ -531,8 +529,7 @@ int isci_task_abort_task(struct sas_task *task)
> */
> spin_lock_irqsave(&task->task_state_lock, flags);
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> - task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
> - SAS_TASK_STATE_PENDING);
> + task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> spin_unlock_irqrestore(&task->task_state_lock, flags);
>
> ret = TMF_RESP_FUNC_COMPLETE;
> @@ -580,8 +577,7 @@ int isci_task_abort_task(struct sas_task *task)
> test_bit(IDEV_GONE, &idev->flags));
>
> spin_lock_irqsave(&task->task_state_lock, flags);
> - task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
> - SAS_TASK_STATE_PENDING);
> + task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> spin_unlock_irqrestore(&task->task_state_lock, flags);
>
> diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
> index 1e52bc7febfa..a8d1f3dd607a 100644
> --- a/drivers/scsi/mvsas/mv_sas.c
> +++ b/drivers/scsi/mvsas/mv_sas.c
> @@ -815,9 +815,6 @@ static int mvs_task_prep(struct sas_task *task, struct mvs_info *mvi, int is_tmf
> slot->port = tei.port;
> task->lldd_task = slot;
> list_add_tail(&slot->entry, &tei.port->list);
> - spin_lock(&task->task_state_lock);
> - task->task_state_flags |= SAS_TASK_AT_INITIATOR;
> - spin_unlock(&task->task_state_lock);
>
> mvi_dev->running_req++;
> ++(*pass);
> @@ -1721,8 +1718,7 @@ int mvs_slot_complete(struct mvs_info *mvi, u32 rx_desc, u32 flags)
> mvi_dev = dev->lldd_dev;
>
> spin_lock(&task->task_state_lock);
> - task->task_state_flags &=
> - ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
> + task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> /* race condition*/
> aborted = task->task_state_flags & SAS_TASK_STATE_ABORTED;
> diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c
> index 9ec310b795c3..4683fee87b84 100644
> --- a/drivers/scsi/pm8001/pm8001_hwi.c
> +++ b/drivers/scsi/pm8001/pm8001_hwi.c
> @@ -1561,7 +1561,6 @@ void pm8001_work_fn(struct work_struct *work)
> atomic_dec(&pm8001_dev->running_req);
> spin_lock_irqsave(&t->task_state_lock, flags1);
> t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> t->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> spin_unlock_irqrestore(&t->task_state_lock, flags1);
> @@ -2105,7 +2104,6 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
> psspPayload->ssp_resp_iu.status);
> spin_lock_irqsave(&t->task_state_lock, flags);
> t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> t->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> spin_unlock_irqrestore(&t->task_state_lock, flags);
> @@ -2273,7 +2271,6 @@ static void mpi_ssp_event(struct pm8001_hba_info *pm8001_ha, void *piomb)
> }
> spin_lock_irqsave(&t->task_state_lock, flags);
> t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> t->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> spin_unlock_irqrestore(&t->task_state_lock, flags);
> @@ -2665,7 +2662,6 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
> }
> spin_lock_irqsave(&t->task_state_lock, flags);
> t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> t->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> spin_unlock_irqrestore(&t->task_state_lock, flags);
> @@ -3022,7 +3018,6 @@ mpi_smp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
> }
> spin_lock_irqsave(&t->task_state_lock, flags);
> t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> t->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> spin_unlock_irqrestore(&t->task_state_lock, flags);
> @@ -3696,7 +3691,6 @@ int pm8001_mpi_task_abort_resp(struct pm8001_hba_info *pm8001_ha, void *piomb)
> }
> spin_lock_irqsave(&t->task_state_lock, flags);
> t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> t->task_state_flags |= SAS_TASK_STATE_DONE;
> spin_unlock_irqrestore(&t->task_state_lock, flags);
> pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
> @@ -4336,7 +4330,6 @@ static int pm8001_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
> ts->resp = SAS_TASK_COMPLETE;
> ts->stat = SAS_SAM_STAT_GOOD;
> task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((task->task_state_flags &
> SAS_TASK_STATE_ABORTED))) {
> diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
> index 32edda3e55c6..8c12fbb9c476 100644
> --- a/drivers/scsi/pm8001/pm8001_sas.c
> +++ b/drivers/scsi/pm8001/pm8001_sas.c
> @@ -487,9 +487,6 @@ static int pm8001_task_exec(struct sas_task *task,
> goto err_out_tag;
> }
> /* TODO: select normal or high priority */
> - spin_lock(&t->task_state_lock);
> - t->task_state_flags |= SAS_TASK_AT_INITIATOR;
> - spin_unlock(&t->task_state_lock);
> } while (0);
> rc = 0;
> goto out_done;
> @@ -983,7 +980,6 @@ void pm8001_open_reject_retry(
> atomic_dec(&pm8001_dev->running_req);
> spin_lock_irqsave(&task->task_state_lock, flags1);
> task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((task->task_state_flags
> & SAS_TASK_STATE_ABORTED))) {
> diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
> index 9d20f8009b89..b83500ef3d86 100644
> --- a/drivers/scsi/pm8001/pm80xx_hwi.c
> +++ b/drivers/scsi/pm8001/pm80xx_hwi.c
> @@ -2178,7 +2178,6 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
> psspPayload->ssp_resp_iu.status);
> spin_lock_irqsave(&t->task_state_lock, flags);
> t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> t->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> spin_unlock_irqrestore(&t->task_state_lock, flags);
> @@ -2362,7 +2361,6 @@ static void mpi_ssp_event(struct pm8001_hba_info *pm8001_ha, void *piomb)
> }
> spin_lock_irqsave(&t->task_state_lock, flags);
> t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> t->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> spin_unlock_irqrestore(&t->task_state_lock, flags);
> @@ -2787,7 +2785,6 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha,
> }
> spin_lock_irqsave(&t->task_state_lock, flags);
> t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> t->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> spin_unlock_irqrestore(&t->task_state_lock, flags);
> @@ -3199,7 +3196,6 @@ mpi_smp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
> }
> spin_lock_irqsave(&t->task_state_lock, flags);
> t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> t->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> spin_unlock_irqrestore(&t->task_state_lock, flags);
> @@ -4722,7 +4718,6 @@ static int pm80xx_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
> ts->resp = SAS_TASK_COMPLETE;
> ts->stat = SAS_SAM_STAT_GOOD;
> task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> - task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> task->task_state_flags |= SAS_TASK_STATE_DONE;
> if (unlikely((task->task_state_flags &
> SAS_TASK_STATE_ABORTED))) {
> diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
> index 698f2032807b..549232d66b40 100644
> --- a/include/scsi/libsas.h
> +++ b/include/scsi/libsas.h
> @@ -617,7 +617,6 @@ struct sas_task_slow {
> #define SAS_TASK_STATE_DONE 2
> #define SAS_TASK_STATE_ABORTED 4
> #define SAS_TASK_NEED_DEV_RESET 8
> -#define SAS_TASK_AT_INITIATOR 16
>
> extern struct sas_task *sas_alloc_task(gfp_t flags);
> extern struct sas_task *sas_alloc_slow_task(gfp_t flags);
--
Damien Le Moal
Western Digital Research
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