[PATCH v7 37/38] sg: warn v3 write system call users

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Should generate one log message per kernel run when the write()
system call is used with the sg interface version 3. Due to
security concerns suggest that they use ioctl(SG_SUBMIT_v3)
instead.

Sg interface version 1 or 2 based code may also be calling
write() in this context. There is no easy solution for them
(short of upgrading their interface to version 3 or 4), so
don't produce a warning suggesting the conversion will be
simple.

Signed-off-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
---
 drivers/scsi/sg.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 18066aabd195..24c4a539eae0 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -646,6 +646,10 @@ sg_write(struct file *filp, const char __user *p, size_t count, loff_t *ppos)
 				     __func__);
 			return -EPERM;
 		}
+		WARN_ONCE(true, "Please use %s instead of write(),\n%s\n",
+			  "ioctl(SG_SUBMIT_V3)",
+			  "  See: http://sg.danny.cz/sg/sg_v40.html";);
+
 		res = sg_v3_submit(filp, sfp, h3p, false, NULL);
 		return res < 0 ? res : (int)count;
 	}
-- 
2.25.1




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