serial: core: Make sure compiler barfs for 16-byte earlycon names
authorDouglas Anderson <dianders@chromium.org>
Fri, 23 Mar 2018 17:58:31 +0000 (10:58 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 3 Aug 2018 05:50:39 +0000 (07:50 +0200)
commit62079c8371aaa08f072a3e41628e753f9696d6df
tree42a97569524f7711d4193348d546e36960438dbb
parent41e1f1feee0634c0acb3727980607c7784c7d494
serial: core: Make sure compiler barfs for 16-byte earlycon names

[ Upstream commit c1c734cb1f54b062f7e67ffc9656d82f5b412b9c ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
include/linux/serial_core.h