Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
scsi: target: Fix WRITE_SAME No Data Buffer crash
In newer version of the SBC specs, we have a NDOB bit that indicates there is no data buffer that gets written out. If this bit is set using commands like “sg_write_same –ndob” we will crash in target_core_iblock/file’s execute_write_same handlers when we go to access the se_cmd->t_data_sg because its NULL.
This patch adds a check for the NDOB bit in the common WRITE SAME code because we don’t support it. And, it adds a check for zero SG elements in each handler in case the initiator tries to send a normal WRITE SAME with no data buffer.
Details
- Affected product:
- CentOS 6 ELS , CentOS 7 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CloudLinux 6 ELS , Oracle Linux 6 ELS , Oracle Linux 7 ELS , RHEL 7 ELS , Ubuntu 16.04 ELS , Ubuntu 20.04 ELS
- Affected packages:
- kernel @ 2.6.32 (+10 more)
In the Linux kernel, the following vulnerability has been resolved:
scsi: target: Fix WRITE_SAME No Data Buffer crash
In newer version of the SBC specs, we have a NDOB bit that indicates there is no data buffer that gets written out. If this bit is set using commands like “sg_write_same –ndob” we will crash in target_core_iblock/file’s execute_write_same handlers when we go to access the se_cmd->t_data_sg because its NULL.
This patch adds a check for the NDOB bit in the common WRITE SAME code because we don’t support it. And, it adds a check for zero SG elements in each handler in case the initiator tries to send a normal WRITE SAME with no data buffer.