linux-kernel - duplicate check for CAP_SYS

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Date:   Tue, 25 Sep 2018 13:27:05 -0400
From:   Tong Zhang <ztong@...edu>
To:     axboe@...nel.dk, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, Wenbo Shen <shenwenbosmile@...il.com>
Subject: duplicate check for CAP_SYS_RAWIO

Kernel Version: 4.18.5

Problem Description:

We found a path where duplicate capability checks are observed,
the path is :

scsi_ioctl<- require CAP_SYS_ADMIN and CAP_SYS_RAWIO
     `->sg_scsi_ioctl() 
                `->blk_verify_command() <- require CAP_SYS_RAWIO

CAP_SYS_RAWIO is checked twice.

related file: 
  block/scsi_ioctl.c:215 
  block/scsi_ioctl.c:471
  drivers/scsi/scsi_ioctl.c:240
  drivers/scsi/scsi_ioctl.c:242

- Tong