diff options
| author | Kees Cook <keescook@chromium.org> | 2013-08-29 00:29:55 +0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-10-27 00:06:00 +0400 |
| commit | 1ccd1fd4c43407721caa38ae034359bf8d9a1b34 (patch) | |
| tree | 161255925d7a0b776cffbf437dedcc2672a6a595 /drivers/hid | |
| parent | 934796aadc4cf907d21b9346b70383d520bd0eea (diff) | |
| download | linux-1ccd1fd4c43407721caa38ae034359bf8d9a1b34.tar.xz | |
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>
[bwh: Backported to 3.2: use dbg_hid() not hid_err()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-core.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 611aafc20f90..91b8478afaaf 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -59,6 +59,8 @@ struct hid_report *hid_register_report(struct hid_device *device, unsigned type, struct hid_report_enum *report_enum = device->report_enum + type; struct hid_report *report; + if (id >= HID_MAX_IDS) + return NULL; if (report_enum->report_id_hash[id]) return report_enum->report_id_hash[id]; @@ -380,8 +382,10 @@ static int hid_parser_global(struct hid_parser *parser, struct hid_item *item) case HID_GLOBAL_ITEM_TAG_REPORT_ID: parser->global.report_id = item_udata(item); - if (parser->global.report_id == 0) { - dbg_hid("report_id 0 is invalid\n"); + if (parser->global.report_id == 0 || + parser->global.report_id >= HID_MAX_IDS) { + dbg_hid("report_id %u is invalid\n", + parser->global.report_id); return -1; } return 0; @@ -552,7 +556,7 @@ static void hid_device_release(struct device *dev) for (i = 0; i < HID_REPORT_TYPES; i++) { struct hid_report_enum *report_enum = device->report_enum + i; - for (j = 0; j < 256; j++) { + for (j = 0; j < HID_MAX_IDS; j++) { struct hid_report *report = report_enum->report_id_hash[j]; if (report) hid_free_report(report); |