[PATCH] scsi: fix legacy /proc parsing buffer overflow

[Tony Battersby]

(lightly modified commit message mostly by Linus Torvalds)

The parsing code for /proc/scsi/scsi is disgusting and broken.  We
should have just used 'sscanf()' or something simple like that, but the
logic may actually predate our kernel sscanf library routine for all I
know.  It certainly predates both git and BK histories.

And we can't change it to be something sane like that now, because the
string matching at the start is done case-insensitively, and the
separator parsing between numbers isn't done at all, so *any* separator
will work, including a possible terminating NUL character.

This interface is root-only, and entirely for legacy use, so there is
absolutely no point in trying to tighten up the parsing.  Because any
separator has traditionally worked, it's entirely possible that people
have used random characters rather than the suggested space.

So don't bother to try to pretty it up, and let's just make a minimal
patch that can be back-ported and we can forget about this whole sorry
thing for another two decades.

Just make it at least not read past the end of the supplied data.

Link: https://lore.kernel.org/linux-scsi/b570f5fe-cb7c-863a-6ed9-f6774c219b88@xxxxxxxxxxxxxxx/
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Martin K Petersen <martin.petersen@xxxxxxxxxx>
Cc: James Bottomley <jejb@xxxxxxxxxxxxx>
Cc: Willy Tarreau <w@xxxxxx>
Cc: stable@xxxxxxxxxx
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
---
 drivers/scsi/scsi_proc.c | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
index 4a6eb1741be0..41f23cd0bfb4 100644
--- a/drivers/scsi/scsi_proc.c
+++ b/drivers/scsi/scsi_proc.c
@@ -406,7 +406,7 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
 			       size_t length, loff_t *ppos)
 {
 	int host, channel, id, lun;
-	char *buffer, *p;
+	char *buffer, *end, *p;
 	int err;
 
 	if (!buf || length > PAGE_SIZE)
@@ -421,10 +421,14 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
 		goto out;
 
 	err = -EINVAL;
-	if (length < PAGE_SIZE)
-		buffer[length] = '\0';
-	else if (buffer[PAGE_SIZE-1])
-		goto out;
+	if (length < PAGE_SIZE) {
+		end = buffer + length;
+		*end = '\0';
+	} else {
+		end = buffer + PAGE_SIZE - 1;
+		if (*end)
+			goto out;
+	}
 
 	/*
 	 * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
@@ -433,10 +437,10 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
 	if (!strncmp("scsi add-single-device", buffer, 22)) {
 		p = buffer + 23;
 
-		host = simple_strtoul(p, &p, 0);
-		channel = simple_strtoul(p + 1, &p, 0);
-		id = simple_strtoul(p + 1, &p, 0);
-		lun = simple_strtoul(p + 1, &p, 0);
+		host    = (p     < end) ? simple_strtoul(p, &p, 0) : 0;
+		channel = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
+		id      = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
+		lun     = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
 
 		err = scsi_add_single_device(host, channel, id, lun);
 
@@ -447,10 +451,10 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
 	} else if (!strncmp("scsi remove-single-device", buffer, 25)) {
 		p = buffer + 26;
 
-		host = simple_strtoul(p, &p, 0);
-		channel = simple_strtoul(p + 1, &p, 0);
-		id = simple_strtoul(p + 1, &p, 0);
-		lun = simple_strtoul(p + 1, &p, 0);
+		host    = (p     < end) ? simple_strtoul(p, &p, 0) : 0;
+		channel = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
+		id      = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
+		lun     = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
 
 		err = scsi_remove_single_device(host, channel, id, lun);
 	}
-- 
2.25.1