diff options
| author | Kees Cook <keescook@chromium.org> | 2017-02-13 16:25:26 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-02-14 08:29:56 -0700 |
| commit | 853fe1bf7554155376bb3b231112cdff9ff79177 (patch) | |
| tree | 7d8b38a77574919d078443cecffcae9dd380a692 /Documentation/cdrom | |
| parent | d1a987f35ebf859a771ac530e95a89933b6fcce8 (diff) | |
cdrom: Make device operations read-only
Since function tables are a common target for attackers, it's best to keep
them in read-only memory. As such, this makes the CDROM device ops tables
const. This drops additionally n_minors, since it isn't used meaningfully,
and sets the only user of cdrom_dummy_generic_packet explicitly so the
variables can all be const.
Inspired by similar changes in grsecurity/PaX.
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'Documentation/cdrom')
| -rw-r--r-- | Documentation/cdrom/cdrom-standard.tex | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/Documentation/cdrom/cdrom-standard.tex b/Documentation/cdrom/cdrom-standard.tex index c06233fe52ac..8f85b0e41046 100644 --- a/Documentation/cdrom/cdrom-standard.tex +++ b/Documentation/cdrom/cdrom-standard.tex @@ -249,7 +249,6 @@ struct& cdrom_device_ops\ \{ \hidewidth\cr unsigned\ long);\cr \noalign{\medskip} &const\ int& capability;& capability flags \cr - &int& n_minors;& number of active minor devices \cr \};\cr } $$ @@ -258,13 +257,7 @@ it should add a function pointer to this $struct$. When a particular function is not implemented, however, this $struct$ should contain a NULL instead. The $capability$ flags specify the capabilities of the \cdrom\ hardware and/or low-level \cdrom\ driver when a \cdrom\ drive -is registered with the \UCD. The value $n_minors$ should be a positive -value indicating the number of minor devices that are supported by -the low-level device driver, normally~1. Although these two variables -are `informative' rather than `operational,' they are included in -$cdrom_device_ops$ because they describe the capability of the {\em -driver\/} rather than the {\em drive}. Nomenclature has always been -difficult in computer programming. +is registered with the \UCD. Note that most functions have fewer parameters than their $blkdev_fops$ counterparts. This is because very little of the |