sg allowed any command for TYPE_SCANNER. The cmd_filter patchset
doesn't. We can't change sg's permission since it might break the
existing software.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
---
drivers/scsi/sg.c | 22 ++++++++++++++--------
1 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 207c357..2973773 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -217,6 +217,18 @@ static int sg_last_dev(void);
#define SZ_SG_IOVEC sizeof(sg_iovec_t)
#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
+static int sg_allow_access(struct file *filp, unsigned char *cmd)
+{
+ struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
+ struct request_queue *q = sfp->parentdp->device->request_queue;
+
+ if (sfp->parentdp->device->type == TYPE_SCANNER)
+ return 0;
+
+ return blk_verify_command(&q->cmd_filter,
+ cmd, filp->f_mode & FMODE_WRITE);
+}
+
static int
sg_open(struct inode *inode, struct file *filp)
{
@@ -641,7 +653,6 @@ sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
unsigned char cmnd[MAX_COMMAND_SIZE];
int timeout;
unsigned long ul_timeout;
- struct request_queue *q;
if (count < SZ_SG_IO_HDR)
return -EINVAL;
@@ -690,9 +701,7 @@ sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
sg_remove_request(sfp, srp);
return -EFAULT;
}
- q = sfp->parentdp->device->request_queue;
- if (read_only && blk_verify_command(&q->cmd_filter, cmnd,
- file->f_mode & FMODE_WRITE)) {
+ if (read_only && sg_allow_access(file, cmnd)) {
sg_remove_request(sfp, srp);
return -EPERM;
}
@@ -1061,14 +1070,11 @@ sg_ioctl(struct inode *inode, struct file *filp,
return -ENODEV;
if (read_only) {
unsigned char opcode = WRITE_6;
- struct request_queue *q = sdp->device->request_queue;
Scsi_Ioctl_Command __user *siocp = p;
if (copy_from_user(&opcode, siocp->data, 1))
return -EFAULT;
- if (blk_verify_command(&q->cmd_filter,
- &opcode,
- filp->f_mode & FMODE_WRITE))
+ if (sg_allow_access(filp, &opcode))
return -EPERM;
}
return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);
--
1.5.4.2
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