diff mbox series

[v11,38/44] sg: warn v3 write system call users

Message ID 20201015020643.432908-39-dgilbert@interlog.com
State Superseded
Headers show
Series [v11,01/44] sg: move functions around | expand

Commit Message

Douglas Gilbert Oct. 15, 2020, 2:06 a.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.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
---
 drivers/scsi/sg.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index da10e6d32f53..b95eb87a3c43 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -645,6 +645,9 @@  sg_write(struct file *filp, const char __user *p, size_t count, loff_t *ppos)
 				     __func__);
 			return -EPERM;
 		}
+		pr_warn_once("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;
 	}