lkml.org 
[lkml]   [2018]   [Mar]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] serial: core: Make sure compiler barfs for 16-byte earlycon names
Date
As part of bringup I ended up wanting to call an earlycon driver by a
name that was exactly 16-bytes big, specifically "qcom_geni_serial".

Unfortunately, when I tried this I found that things compiled just
fine. They just didn't work.

Specifically the compiler felt perfectly justified in initting the
".name" field of "struct earlycon_id" with the full 16-bytes and just
skipping the '\0'. Needless to say, that behavior didn't seem ideal,
but I guess someone must have allowed it for a reason.

One way to fix this is to shorten the name field to 15 bytes and then
add an extra byte after that nobody touches. This should always be
initted to 0 and we're golden.

There are, of course, other ways to fix this too. We could audit all
the users of the "name" field and make them stop at both null
termination or at 16 bytes. We could also just make the name field
much bigger so that we're not likely to run into this. ...but both
seem like we'll just hit the bug again.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

include/linux/serial_core.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index b32df49a3bd5..afef67cc27d3 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -348,7 +348,8 @@ struct earlycon_device {
};

struct earlycon_id {
- char name[16];
+ char name[15];
+ char name_term; /* In case compiler didn't '\0' term name */
char compatible[128];
int (*setup)(struct earlycon_device *, const char *options);
} __aligned(32);
--
2.17.0.rc0.231.g781580f067-goog
\
 
 \ /
  Last update: 2018-03-23 18:59    [W:0.027 / U:6.128 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site