| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Tue, 30 Apr 2013 13:12:49 -0700
From: merez@...eaurora.org
To: "Ulf Hansson" <ulf.hansson@...aro.org>
Cc: "Maya Erez" <merez@...eaurora.org>, linux-mmc@...r.kernel.org,
linux-arm-msm@...r.kernel.org,
"Yaniv Gardi" <ygardi@...eaurora.org>,
"open list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mmc: card: Adding support for sanitize in eMMC 4.5
Hi Ulf,
You are right, the caps2 flag for Sanitize can be removed.
I will send a fix for that.
Thanks,
Maya
> On 17 April 2013 13:38, Maya Erez <merez@...eaurora.org> wrote:
>> The sanitize support is added as a user-app ioctl call, and
>> was removed from the block-device request, since its purpose is
>> to be invoked not via File-System but by a user.
>> This feature deletes the unmap memory region of the eMMC card,
>> by writing to a specific register in the EXT_CSD.
>> unmap region is the memory region that was previously deleted
>> (by erase, trim or discard operation).
>> In order to avoid timeout when sanitizing large-scale cards,
>> the timeout for sanitize operation is 240 seconds.
>>
>> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>> Signed-off-by: Maya Erez <merez@...eaurora.org>
>> ---
>> drivers/mmc/card/block.c | 68
>> +++++++++++++++++++++++++++++++--------------
>> drivers/mmc/card/queue.c | 2 +-
>> drivers/mmc/core/core.c | 21 ++++++++++++++
>> include/linux/mmc/core.h | 2 +
>> include/linux/mmc/host.h | 1 +
>> 5 files changed, 72 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>> index e12a03c..1f043ee 100644
>> --- a/drivers/mmc/card/block.c
>> +++ b/drivers/mmc/card/block.c
>> @@ -58,6 +58,8 @@ MODULE_ALIAS("mmc:block");
>> #define INAND_CMD38_ARG_SECTRIM1 0x81
>> #define INAND_CMD38_ARG_SECTRIM2 0x88
>> #define MMC_BLK_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute
>> timeout */
>> +#define MMC_SANITIZE_REQ_TIMEOUT 240000
>> +#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
>>
>> #define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
>> (req->cmd_flags & REQ_META)) && \
>> @@ -409,6 +411,35 @@ static int ioctl_rpmb_card_status_poll(struct
>> mmc_card *card, u32 *status,
>> return err;
>> }
>>
>> +static int ioctl_do_sanitize(struct mmc_card *card)
>> +{
>> + int err;
>> +
>> + if (!(mmc_can_sanitize(card) &&
>> + (card->host->caps2 & MMC_CAP2_SANITIZE))) {
>> + pr_warn("%s: %s - SANITIZE is not supported\n",
>> + mmc_hostname(card->host), __func__);
>> + err = -EOPNOTSUPP;
>> + goto out;
>> + }
>> +
>> + pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
>> + mmc_hostname(card->host), __func__);
>> +
>> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> + EXT_CSD_SANITIZE_START, 1,
>> + MMC_SANITIZE_REQ_TIMEOUT);
>> +
>> + if (err)
>> + pr_err("%s: %s - EXT_CSD_SANITIZE_START failed.
>> err=%d\n",
>> + mmc_hostname(card->host), __func__, err);
>> +
>> + pr_debug("%s: %s - SANITIZE COMPLETED\n",
>> mmc_hostname(card->host),
>> + __func__);
>> +out:
>> + return err;
>> +}
>> +
>> static int mmc_blk_ioctl_cmd(struct block_device *bdev,
>> struct mmc_ioc_cmd __user *ic_ptr)
>> {
>> @@ -511,6 +542,16 @@ static int mmc_blk_ioctl_cmd(struct block_device
>> *bdev,
>> goto cmd_rel_host;
>> }
>>
>> + if (MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) ==
>> EXT_CSD_SANITIZE_START) {
>> + err = ioctl_do_sanitize(card);
>> +
>> + if (err)
>> + pr_err("%s: ioctl_do_sanitize() failed. err =
>> %d",
>> + __func__, err);
>> +
>> + goto cmd_rel_host;
>> + }
>> +
>> mmc_wait_for_req(card->host, &mrq);
>>
>> if (cmd.error) {
>> @@ -940,10 +981,10 @@ static int mmc_blk_issue_secdiscard_rq(struct
>> mmc_queue *mq,
>> {
>> struct mmc_blk_data *md = mq->data;
>> struct mmc_card *card = md->queue.card;
>> - unsigned int from, nr, arg, trim_arg, erase_arg;
>> + unsigned int from, nr, arg;
>> int err = 0, type = MMC_BLK_SECDISCARD;
>>
>> - if (!(mmc_can_secure_erase_trim(card) ||
>> mmc_can_sanitize(card))) {
>> + if (!(mmc_can_secure_erase_trim(card))) {
>> err = -EOPNOTSUPP;
>> goto out;
>> }
>> @@ -951,23 +992,11 @@ static int mmc_blk_issue_secdiscard_rq(struct
>> mmc_queue *mq,
>> from = blk_rq_pos(req);
>> nr = blk_rq_sectors(req);
>>
>> - /* The sanitize operation is supported at v4.5 only */
>> - if (mmc_can_sanitize(card)) {
>> - erase_arg = MMC_ERASE_ARG;
>> - trim_arg = MMC_TRIM_ARG;
>> - } else {
>> - erase_arg = MMC_SECURE_ERASE_ARG;
>> - trim_arg = MMC_SECURE_TRIM1_ARG;
>> - }
>> + if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from,
>> nr))
>> + arg = MMC_SECURE_TRIM1_ARG;
>> + else
>> + arg = MMC_SECURE_ERASE_ARG;
>>
>> - if (mmc_erase_group_aligned(card, from, nr))
>> - arg = erase_arg;
>> - else if (mmc_can_trim(card))
>> - arg = trim_arg;
>> - else {
>> - err = -EINVAL;
>> - goto out;
>> - }
>> retry:
>> if (card->quirks & MMC_QUIRK_INAND_CMD38) {
>> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> @@ -1003,9 +1032,6 @@ retry:
>> goto out;
>> }
>>
>> - if (mmc_can_sanitize(card))
>> - err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> - EXT_CSD_SANITIZE_START, 1, 0);
>> out_retry:
>> if (err && !mmc_blk_reset(md, card->host, type))
>> goto retry;
>> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
>> index 9447a0e..fa9632e 100644
>> --- a/drivers/mmc/card/queue.c
>> +++ b/drivers/mmc/card/queue.c
>> @@ -173,7 +173,7 @@ static void mmc_queue_setup_discard(struct
>> request_queue *q,
>> /* granularity must not be greater than max. discard */
>> if (card->pref_erase > max_discard)
>> q->limits.discard_granularity = 0;
>> - if (mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))
>> + if (mmc_can_secure_erase_trim(card))
>> queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
>> }
>>
>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>> index 37c5dad..dea9381 100644
>> --- a/drivers/mmc/core/core.c
>> +++ b/drivers/mmc/core/core.c
>> @@ -402,6 +402,27 @@ static int mmc_wait_for_data_req_done(struct
>> mmc_host *host,
>> context_info->is_done_rcv = false;
>> context_info->is_new_req = false;
>> cmd = mrq->cmd;
>> +
>> + /*
>> + * If host has timed out waiting for the
>> sanitize
>> + * to complete, card might be still in
>> programming state
>> + * so let's try to bring the card out of
>> programming
>> + * state.
>> + */
>> + if (cmd->sanitize_busy && cmd->error ==
>> -ETIMEDOUT) {
>> + if (!mmc_interrupt_hpi(host->card)) {
>> + pr_warning("%s: %s: Interrupted
>> "
>> + "sanitize\n",
>> + mmc_hostname(host),
>> + __func__);
>> + cmd->error = 0;
>> + break;
>> + } else {
>> + pr_err("%s: %s: Failed to
>> interrupt "
>> + "sanitize\n",
>> + mmc_hostname(host),
>> __func__);
>> + }
>> + }
>> if (!cmd->error || !cmd->retries ||
>> mmc_card_removed(host->card)) {
>> err = host->areq->err_check(host->card,
>> diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
>> index 39613b9..bd06ff5 100644
>> --- a/include/linux/mmc/core.h
>> +++ b/include/linux/mmc/core.h
>> @@ -96,6 +96,8 @@ struct mmc_command {
>> */
>>
>> unsigned int cmd_timeout_ms; /* in milliseconds */
>> + /* Set this flag only for blocking sanitize request */
>> + bool sanitize_busy;
>>
>> struct mmc_data *data; /* data segment
>> associated with cmd */
>> struct mmc_request *mrq; /* associated request */
>> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
>> index e326ae2..00c10be 100644
>> --- a/include/linux/mmc/host.h
>> +++ b/include/linux/mmc/host.h
>> @@ -281,6 +281,7 @@ struct mmc_host {
>> #define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \
>> MMC_CAP2_PACKED_WR)
>> #define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before
>> scan */
>> +#define MMC_CAP2_SANITIZE (1 << 15) /* Support
>> Sanitize */
>
> Is there a specific reason to why a cap is needed? Would it be okay to
> use this feature just if the card supports it?
>
>>
>> mmc_pm_flag_t pm_caps; /* supported pm features
>> */
>>
>> --
>> 1.7.3.3
>> --
>> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a
>> member
>> of Code Aurora Forum, hosted by The Linux Foundation
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel"
>> in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at http://www.tux.org/lkml/
>
> Kind regards
> Ulf Hansson
> --
> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
Maya Erez
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists