diff mbox series

[v6,36/37] sg: warn v3 write system call users

Message ID 20200112235755.14197-37-dgilbert@interlog.com (mailing list archive)
State Deferred
Headers show
Series sg: add v4 interface | expand

Commit Message

Douglas Gilbert Jan. 12, 2020, 11:57 p.m. UTC 
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@interlog.com>
---
 drivers/scsi/sg.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index e26efcbb1a41..5b0de8dab05d 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -684,6 +684,10 @@  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;
 	}