diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ata/libata-core.c | 12 | ||||
| -rw-r--r-- | drivers/ata/libata-scsi.c | 18 | ||||
| -rw-r--r-- | drivers/ata/libata.h | 1 |
3 files changed, 30 insertions, 1 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 6380726f753..9b7f3c47773 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -119,6 +119,10 @@ int libata_noacpi = 0; module_param_named(noacpi, libata_noacpi, int, 0444); MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set"); +int libata_allow_tpm = 0; +module_param_named(allow_tpm, libata_allow_tpm, int, 0444); +MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands"); + MODULE_AUTHOR("Jeff Garzik"); MODULE_DESCRIPTION("Library module for ATA devices"); MODULE_LICENSE("GPL"); @@ -2161,8 +2165,14 @@ int ata_dev_configure(struct ata_device *dev) "supports DRM functions and may " "not be fully accessable.\n"); snprintf(revbuf, 7, "CFA"); - } else + } else { snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id)); + /* Warn the user if the device has TPM extensions */ + if (ata_id_has_tpm(id)) + ata_dev_printk(dev, KERN_WARNING, + "supports DRM functions and may " + "not be fully accessable.\n"); + } dev->n_sectors = ata_id_n_sectors(id); diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 14daf4848f0..f802dbce41a 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -2690,6 +2690,24 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) goto invalid_fld; + /* + * Filter TPM commands by default. These provide an + * essentially uncontrolled encrypted "back door" between + * applications and the disk. Set libata.allow_tpm=1 if you + * have a real reason for wanting to use them. This ensures + * that installed software cannot easily mess stuff up without + * user intent. DVR type users will probably ship with this enabled + * for movie content management. + * + * Note that for ATA8 we can issue a DCS change and DCS freeze lock + * for this and should do in future but that it is not sufficient as + * DCS is an optional feature set. Thus we also do the software filter + * so that we comply with the TC consortium stated goal that the user + * can turn off TC features of their system. + */ + if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) + goto invalid_fld; + /* We may not issue DMA commands if no DMA mode is set */ if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) goto invalid_fld; diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h index bbe59c2fd1e..048e26cfb33 100644 --- a/drivers/ata/libata.h +++ b/drivers/ata/libata.h @@ -60,6 +60,7 @@ extern int atapi_dmadir; extern int atapi_passthru16; extern int libata_fua; extern int libata_noacpi; +extern int libata_allow_tpm; extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev); extern int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev, u64 block, u32 n_block, unsigned int tf_flags, |