From: Jason Yan yanaijie@huawei.com
hulk inclusion category: bugfix bugzilla: NA CVE: NA
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When the scsi device status is offline, mode sense command will return a result with only DID_NO_CONNECT set. Then in sd_read_write_protect_flag(), only status byte of the result is checked, we still consider the command returned good, and read sdkp->write_prot from the buffer. And because of bug [1], garbage data is copied to the buffer, the disk sometimes be set readonly. When the scsi device is set running again, users cannot write data to the disk.
Fix this by check the whole result returned by the driver.
[1] https://patchwork.kernel.org/project/linux-block/patch/20210318122621.330010...
Signed-off-by: Jason Yan yanaijie@huawei.com Reviewed-by: Yufen Yu yuyufen@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/scsi/sd.c | 6 +++--- include/scsi/scsi.h | 13 +++++++++++++ 2 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 478c2f8334d85..d466d5a4b3129 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2651,18 +2651,18 @@ sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) * 5: Illegal Request, Sense Code 24: Invalid field in * CDB. */ - if (!scsi_status_is_good(res)) + if (!scsi_result_is_good(res)) res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
/* * Third attempt: ask 255 bytes, as we did earlier. */ - if (!scsi_status_is_good(res)) + if (!scsi_result_is_good(res)) res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, &data, NULL); }
- if (!scsi_status_is_good(res)) { + if (!scsi_result_is_good(res)) { sd_first_printk(KERN_WARNING, sdkp, "Test WP failed, assume Write Enabled\n"); } else { diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h index eb7853c1a23b8..f6c2dedd7f8c9 100644 --- a/include/scsi/scsi.h +++ b/include/scsi/scsi.h @@ -55,6 +55,19 @@ static inline int scsi_status_is_good(int status) (status == SAM_STAT_COMMAND_TERMINATED)); }
+/** scsi_result_is_good - check the result return. + * + * @result: the result passed up from the driver (including host and + * driver components) + * + * Drivers may only set other bytes but not status byte. + * This checks both the status byte and other bytes. + */ +static inline int scsi_result_is_good(int result) +{ + return scsi_status_is_good(result) && (result & ~0xff) == 0; +} +
/* * standard mode-select header prepended to all mode-select commands