diff options
| author | Kees Cook <keescook@chromium.org> | 2013-08-28 22:29:55 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-26 17:21:46 -0700 |
| commit | eedeac300ac807db2f7b035b93b4644e894656d7 (patch) | |
| tree | 7a4ccdace5bde373a785627f0241f11836e241fd /include | |
| parent | 0c268dc93631a821dc5cc323e77b8be51bc58ea5 (diff) | |
HID: validate HID report id size
commit 43622021d2e2b82ea03d883926605bdd0525e1d1 upstream.
The "Report ID" field of a HID report is used to build indexes of
reports. The kernel's index of these is limited to 256 entries, so any
malicious device that sets a Report ID greater than 255 will trigger
memory corruption on the host:
[ 1347.156239] BUG: unable to handle kernel paging request at ffff88094958a878
[ 1347.156261] IP: [<ffffffff813e4da0>] hid_register_report+0x2a/0x8b
CVE-2013-2888
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/hid.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/hid.h b/include/linux/hid.h index 0c48991b040..ff545cc33c3 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -393,10 +393,12 @@ struct hid_report { struct hid_device *device; /* associated device */ }; +#define HID_MAX_IDS 256 + struct hid_report_enum { unsigned numbered; struct list_head report_list; - struct hid_report *report_id_hash[256]; + struct hid_report *report_id_hash[HID_MAX_IDS]; }; #define HID_REPORT_TYPES 3 |