Date: Thu, 15 Mar 2018 23:01:04 +0000 (UTC) From: Marius Strobl <marius@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r331037 - stable/10/sys/dev/mmc Message-ID: <201803152301.w2FN14Hs073093@repo.freebsd.org>
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Author: marius Date: Thu Mar 15 23:01:04 2018 New Revision: 331037 URL: https://svnweb.freebsd.org/changeset/base/331037 Log: MFC: r327355, r327926 - Don't allow userland to switch partitions; it's next to impossible to recover from that, especially when something goes wrong. - When userland changes EXT_CSD, update the kernel copy before using relevant EXT_CSD bits in mmcsd_switch_part(). Modified: stable/10/sys/dev/mmc/mmcsd.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/dev/mmc/mmcsd.c ============================================================================== --- stable/10/sys/dev/mmc/mmcsd.c Thu Mar 15 23:01:00 2018 (r331036) +++ stable/10/sys/dev/mmc/mmcsd.c Thu Mar 15 23:01:04 2018 (r331037) @@ -914,6 +914,16 @@ mmcsd_ioctl_cmd(struct mmcsd_part *part, struct mmc_io default: break; } + /* + * No partition switching in userland; it's almost impossible + * to recover from that, especially if things go wrong. + */ + if (cmd.opcode == MMC_SWITCH_FUNC && dp != NULL && + (((uint8_t *)dp)[EXT_CSD_PART_CONFIG] & + EXT_CSD_PART_CONFIG_ACC_MASK) != part->type) { + err = EINVAL; + goto out; + } } dev = sc->dev; mmcbus = sc->mmcbus; @@ -934,7 +944,7 @@ mmcsd_ioctl_cmd(struct mmcsd_part *part, struct mmc_io if (part->type == EXT_CSD_PART_CONFIG_ACC_RPMB) { /* * If the request went to the RPMB partition, try to ensure - * that the command actually has completed ... + * that the command actually has completed. */ retries = MMCSD_CMD_RETRIES; do { @@ -946,13 +956,6 @@ mmcsd_ioctl_cmd(struct mmcsd_part *part, struct mmc_io break; DELAY(1000); } while (retries-- > 0); - -switch_back: - /* ... and always switch back to the default partition. */ - err = mmcsd_switch_part(mmcbus, dev, rca, - EXT_CSD_PART_CONFIG_ACC_DEFAULT); - if (err != MMC_ERR_NONE) - goto release; } /* * If EXT_CSD was changed, our copy is outdated now. Specifically, @@ -961,6 +964,17 @@ switch_back: */ if (cmd.opcode == MMC_SWITCH_FUNC) { err = mmc_send_ext_csd(mmcbus, dev, sc->ext_csd); + if (err != MMC_ERR_NONE) + goto release; + } +switch_back: + if (part->type == EXT_CSD_PART_CONFIG_ACC_RPMB) { + /* + * If the request went to the RPMB partition, always switch + * back to the default partition (see mmcsd_switch_part()). + */ + err = mmcsd_switch_part(mmcbus, dev, rca, + EXT_CSD_PART_CONFIG_ACC_DEFAULT); if (err != MMC_ERR_NONE) goto release; }
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