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SUSE:SLE-12-SP1:Update
xorg-x11-server.5068
U_Xi_unvalidated_lengths_in_Xinput_extension.patch
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File U_Xi_unvalidated_lengths_in_Xinput_extension.patch of Package xorg-x11-server.5068
Subject: Xi: unvalidated lengths in Xinput extension References: bnc#907268, CVE-2014-8095 Patch-Mainline: Upstream Signed-off-by: Michal Srb <msrb@suse.com> Multiple functions in the Xinput extension handling of requests from clients failed to check that the length of the request sent by the client was large enough to perform all the required operations and thus could read or write to memory outside the bounds of the request buffer. This commit includes the creation of a new REQUEST_AT_LEAST_EXTRA_SIZE macro in include/dix.h for the common case of needing to ensure a request is large enough to include both the request itself and a minimum amount of extra data following the request header. Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com> Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net> --- Xi/chgdctl.c | 8 ++++++-- Xi/chgfctl.c | 2 ++ Xi/sendexev.c | 3 +++ Xi/xiallowev.c | 2 ++ Xi/xichangecursor.c | 2 +- Xi/xichangehierarchy.c | 35 ++++++++++++++++++++++++++++++++--- Xi/xigetclientpointer.c | 1 + Xi/xigrabdev.c | 9 ++++++++- Xi/xipassivegrab.c | 12 ++++++++++-- Xi/xiproperty.c | 14 ++++++-------- Xi/xiquerydevice.c | 1 + Xi/xiquerypointer.c | 2 ++ Xi/xiselectev.c | 8 ++++++++ Xi/xisetclientpointer.c | 3 ++- Xi/xisetdevfocus.c | 4 ++++ Xi/xiwarppointer.c | 2 ++ include/dix.h | 4 ++++ 17 files changed, 94 insertions(+), 18 deletions(-) diff --git a/Xi/chgdctl.c b/Xi/chgdctl.c index d078aa2..b3ee867 100644 --- a/Xi/chgdctl.c +++ b/Xi/chgdctl.c @@ -78,7 +78,7 @@ SProcXChangeDeviceControl(ClientPtr client) REQUEST(xChangeDeviceControlReq); swaps(&stuff->length); - REQUEST_AT_LEAST_SIZE(xChangeDeviceControlReq); + REQUEST_AT_LEAST_EXTRA_SIZE(xChangeDeviceControlReq, sizeof(xDeviceCtl)); swaps(&stuff->control); ctl = (xDeviceCtl *) &stuff[1]; swaps(&ctl->control); @@ -115,7 +115,7 @@ ProcXChangeDeviceControl(ClientPtr client) xDeviceEnableCtl *e; REQUEST(xChangeDeviceControlReq); - REQUEST_AT_LEAST_SIZE(xChangeDeviceControlReq); + REQUEST_AT_LEAST_EXTRA_SIZE(xChangeDeviceControlReq, sizeof(xDeviceCtl)); len = stuff->length - bytes_to_int32(sizeof(xChangeDeviceControlReq)); ret = dixLookupDevice(&dev, stuff->deviceid, client, DixManageAccess); @@ -192,6 +192,10 @@ ProcXChangeDeviceControl(ClientPtr client) break; case DEVICE_ENABLE: e = (xDeviceEnableCtl *) &stuff[1]; + if ((len != bytes_to_int32(sizeof(xDeviceEnableCtl)))) { + ret = BadLength; + goto out; + } if (IsXTestDevice(dev, NULL)) status = !Success; diff --git a/Xi/chgfctl.c b/Xi/chgfctl.c index 6dcf60c..224c2ba 100644 --- a/Xi/chgfctl.c +++ b/Xi/chgfctl.c @@ -467,6 +467,8 @@ ProcXChangeFeedbackControl(ClientPtr client) xStringFeedbackCtl *f = ((xStringFeedbackCtl *) &stuff[1]); if (client->swapped) { + if (len < bytes_to_int32(sizeof(xStringFeedbackCtl))) + return BadLength; swaps(&f->num_keysyms); } if (len != diff --git a/Xi/sendexev.c b/Xi/sendexev.c index 3c21386..183f88d 100644 --- a/Xi/sendexev.c +++ b/Xi/sendexev.c @@ -135,6 +135,9 @@ ProcXSendExtensionEvent(ClientPtr client) if (ret != Success) return ret; + if (stuff->num_events == 0) + return ret; + /* The client's event type must be one defined by an extension. */ first = ((xEvent *) &stuff[1]); diff --git a/Xi/xiallowev.c b/Xi/xiallowev.c index ebef233..ca263ef 100644 --- a/Xi/xiallowev.c +++ b/Xi/xiallowev.c @@ -48,6 +48,7 @@ int SProcXIAllowEvents(ClientPtr client) { REQUEST(xXIAllowEventsReq); + REQUEST_AT_LEAST_SIZE(xXIAllowEventsReq); swaps(&stuff->length); swaps(&stuff->deviceid); @@ -55,6 +56,7 @@ SProcXIAllowEvents(ClientPtr client) if (stuff->length > 3) { xXI2_2AllowEventsReq *req_xi22 = (xXI2_2AllowEventsReq *) stuff; + REQUEST_AT_LEAST_SIZE(xXI2_2AllowEventsReq); swapl(&req_xi22->touchid); swapl(&req_xi22->grab_window); } diff --git a/Xi/xichangecursor.c b/Xi/xichangecursor.c index 7a1bb7a..8e6255b 100644 --- a/Xi/xichangecursor.c +++ b/Xi/xichangecursor.c @@ -57,11 +57,11 @@ int SProcXIChangeCursor(ClientPtr client) { REQUEST(xXIChangeCursorReq); + REQUEST_SIZE_MATCH(xXIChangeCursorReq); swaps(&stuff->length); swapl(&stuff->win); swapl(&stuff->cursor); swaps(&stuff->deviceid); - REQUEST_SIZE_MATCH(xXIChangeCursorReq); return (ProcXIChangeCursor(client)); } diff --git a/Xi/xichangehierarchy.c b/Xi/xichangehierarchy.c index 9e36354..2732445 100644 --- a/Xi/xichangehierarchy.c +++ b/Xi/xichangehierarchy.c @@ -411,7 +411,7 @@ int ProcXIChangeHierarchy(ClientPtr client) { xXIAnyHierarchyChangeInfo *any; - int required_len = sizeof(xXIChangeHierarchyReq); + size_t len; /* length of data remaining in request */ int rc = Success; int flags[MAXDEVICES] = { 0 }; @@ -421,21 +421,46 @@ ProcXIChangeHierarchy(ClientPtr client) if (!stuff->num_changes) return rc; + if (stuff->length > (INT_MAX >> 2)) + return BadAlloc; + len = (stuff->length << 2) - sizeof(xXIAnyHierarchyChangeInfo); + any = (xXIAnyHierarchyChangeInfo *) &stuff[1]; while (stuff->num_changes--) { + if (len < sizeof(xXIAnyHierarchyChangeInfo)) { + rc = BadLength; + goto unwind; + } + SWAPIF(swaps(&any->type)); SWAPIF(swaps(&any->length)); - required_len += any->length; - if ((stuff->length * 4) < required_len) + if ((any->length > (INT_MAX >> 2)) || (len < (any->length << 2))) return BadLength; +#define CHANGE_SIZE_MATCH(type) \ + do { \ + if ((len < sizeof(type)) || (any->length != (sizeof(type) >> 2))) { \ + rc = BadLength; \ + goto unwind; \ + } \ + } while(0) + switch (any->type) { case XIAddMaster: { xXIAddMasterInfo *c = (xXIAddMasterInfo *) any; + /* Variable length, due to appended name string */ + if (len < sizeof(xXIAddMasterInfo)) { + rc = BadLength; + goto unwind; + } SWAPIF(swaps(&c->name_len)); + if (c->name_len > (len - sizeof(xXIAddMasterInfo))) { + rc = BadLength; + goto unwind; + } rc = add_master(client, c, flags); if (rc != Success) @@ -446,6 +471,7 @@ ProcXIChangeHierarchy(ClientPtr client) { xXIRemoveMasterInfo *r = (xXIRemoveMasterInfo *) any; + CHANGE_SIZE_MATCH(xXIRemoveMasterInfo); rc = remove_master(client, r, flags); if (rc != Success) goto unwind; @@ -455,6 +481,7 @@ ProcXIChangeHierarchy(ClientPtr client) { xXIDetachSlaveInfo *c = (xXIDetachSlaveInfo *) any; + CHANGE_SIZE_MATCH(xXIDetachSlaveInfo); rc = detach_slave(client, c, flags); if (rc != Success) goto unwind; @@ -464,6 +491,7 @@ ProcXIChangeHierarchy(ClientPtr client) { xXIAttachSlaveInfo *c = (xXIAttachSlaveInfo *) any; + CHANGE_SIZE_MATCH(xXIAttachSlaveInfo); rc = attach_slave(client, c, flags); if (rc != Success) goto unwind; @@ -471,6 +499,7 @@ ProcXIChangeHierarchy(ClientPtr client) break; } + len -= any->length * 4; any = (xXIAnyHierarchyChangeInfo *) ((char *) any + any->length * 4); } diff --git a/Xi/xigetclientpointer.c b/Xi/xigetclientpointer.c index 3c90d58..306dd39 100644 --- a/Xi/xigetclientpointer.c +++ b/Xi/xigetclientpointer.c @@ -50,6 +50,7 @@ int SProcXIGetClientPointer(ClientPtr client) { REQUEST(xXIGetClientPointerReq); + REQUEST_SIZE_MATCH(xXIGetClientPointerReq); swaps(&stuff->length); swapl(&stuff->win); diff --git a/Xi/xigrabdev.c b/Xi/xigrabdev.c index 63d95bc..e2a2ae3 100644 --- a/Xi/xigrabdev.c +++ b/Xi/xigrabdev.c @@ -47,6 +47,11 @@ int SProcXIGrabDevice(ClientPtr client) { REQUEST(xXIGrabDeviceReq); + /* + * Check here for at least the length of the struct we swap, then + * let ProcXIGrabDevice check the full size after we swap mask_len. + */ + REQUEST_AT_LEAST_SIZE(xXIGrabDeviceReq); swaps(&stuff->length); swaps(&stuff->deviceid); @@ -71,7 +76,7 @@ ProcXIGrabDevice(ClientPtr client) unsigned int pointer_mode; REQUEST(xXIGrabDeviceReq); - REQUEST_AT_LEAST_SIZE(xXIGrabDeviceReq); + REQUEST_FIXED_SIZE(xXIGrabDeviceReq, ((size_t) stuff->mask_len) * 4); ret = dixLookupDevice(&dev, stuff->deviceid, client, DixGrabAccess); if (ret != Success) @@ -131,6 +136,7 @@ int SProcXIUngrabDevice(ClientPtr client) { REQUEST(xXIUngrabDeviceReq); + REQUEST_SIZE_MATCH(xXIUngrabDeviceReq); swaps(&stuff->length); swaps(&stuff->deviceid); @@ -148,6 +154,7 @@ ProcXIUngrabDevice(ClientPtr client) TimeStamp time; REQUEST(xXIUngrabDeviceReq); + REQUEST_SIZE_MATCH(xXIUngrabDeviceReq); ret = dixLookupDevice(&dev, stuff->deviceid, client, DixGetAttrAccess); if (ret != Success) diff --git a/Xi/xipassivegrab.c b/Xi/xipassivegrab.c index 700622d..9241ffd 100644 --- a/Xi/xipassivegrab.c +++ b/Xi/xipassivegrab.c @@ -53,6 +53,7 @@ SProcXIPassiveGrabDevice(ClientPtr client) uint32_t *mods; REQUEST(xXIPassiveGrabDeviceReq); + REQUEST_AT_LEAST_SIZE(xXIPassiveGrabDeviceReq); swaps(&stuff->length); swaps(&stuff->deviceid); @@ -63,6 +64,8 @@ SProcXIPassiveGrabDevice(ClientPtr client) swaps(&stuff->mask_len); swaps(&stuff->num_modifiers); + REQUEST_FIXED_SIZE(xXIPassiveGrabDeviceReq, + ((uint32_t) stuff->mask_len + stuff->num_modifiers) *4); mods = (uint32_t *) &stuff[1] + stuff->mask_len; for (i = 0; i < stuff->num_modifiers; i++, mods++) { @@ -92,7 +95,8 @@ ProcXIPassiveGrabDevice(ClientPtr client) int mask_len; REQUEST(xXIPassiveGrabDeviceReq); - REQUEST_AT_LEAST_SIZE(xXIPassiveGrabDeviceReq); + REQUEST_FIXED_SIZE(xXIPassiveGrabDeviceReq, + ((uint32_t) stuff->mask_len + stuff->num_modifiers) * 4); if (stuff->deviceid == XIAllDevices) dev = inputInfo.all_devices; @@ -252,6 +256,7 @@ SProcXIPassiveUngrabDevice(ClientPtr client) uint32_t *modifiers; REQUEST(xXIPassiveUngrabDeviceReq); + REQUEST_AT_LEAST_SIZE(xXIPassiveUngrabDeviceReq); swaps(&stuff->length); swapl(&stuff->grab_window); @@ -259,6 +264,8 @@ SProcXIPassiveUngrabDevice(ClientPtr client) swapl(&stuff->detail); swaps(&stuff->num_modifiers); + REQUEST_FIXED_SIZE(xXIPassiveUngrabDeviceReq, + ((uint32_t) stuff->num_modifiers) << 2); modifiers = (uint32_t *) &stuff[1]; for (i = 0; i < stuff->num_modifiers; i++, modifiers++) @@ -277,7 +284,8 @@ ProcXIPassiveUngrabDevice(ClientPtr client) int i, rc; REQUEST(xXIPassiveUngrabDeviceReq); - REQUEST_AT_LEAST_SIZE(xXIPassiveUngrabDeviceReq); + REQUEST_FIXED_SIZE(xXIPassiveUngrabDeviceReq, + ((uint32_t) stuff->num_modifiers) << 2); if (stuff->deviceid == XIAllDevices) dev = inputInfo.all_devices; diff --git a/Xi/xiproperty.c b/Xi/xiproperty.c index 463607d..8e8e4b0 100644 --- a/Xi/xiproperty.c +++ b/Xi/xiproperty.c @@ -1013,10 +1013,9 @@ int SProcXListDeviceProperties(ClientPtr client) { REQUEST(xListDevicePropertiesReq); + REQUEST_SIZE_MATCH(xListDevicePropertiesReq); swaps(&stuff->length); - - REQUEST_SIZE_MATCH(xListDevicePropertiesReq); return (ProcXListDeviceProperties(client)); } @@ -1037,10 +1036,10 @@ int SProcXDeleteDeviceProperty(ClientPtr client) { REQUEST(xDeleteDevicePropertyReq); + REQUEST_SIZE_MATCH(xDeleteDevicePropertyReq); swaps(&stuff->length); swapl(&stuff->property); - REQUEST_SIZE_MATCH(xDeleteDevicePropertyReq); return (ProcXDeleteDeviceProperty(client)); } @@ -1048,13 +1047,13 @@ int SProcXGetDeviceProperty(ClientPtr client) { REQUEST(xGetDevicePropertyReq); + REQUEST_SIZE_MATCH(xGetDevicePropertyReq); swaps(&stuff->length); swapl(&stuff->property); swapl(&stuff->type); swapl(&stuff->longOffset); swapl(&stuff->longLength); - REQUEST_SIZE_MATCH(xGetDevicePropertyReq); return (ProcXGetDeviceProperty(client)); } @@ -1253,11 +1252,10 @@ int SProcXIListProperties(ClientPtr client) { REQUEST(xXIListPropertiesReq); + REQUEST_SIZE_MATCH(xXIListPropertiesReq); swaps(&stuff->length); swaps(&stuff->deviceid); - - REQUEST_SIZE_MATCH(xXIListPropertiesReq); return (ProcXIListProperties(client)); } @@ -1279,11 +1277,11 @@ int SProcXIDeleteProperty(ClientPtr client) { REQUEST(xXIDeletePropertyReq); + REQUEST_SIZE_MATCH(xXIDeletePropertyReq); swaps(&stuff->length); swaps(&stuff->deviceid); swapl(&stuff->property); - REQUEST_SIZE_MATCH(xXIDeletePropertyReq); return (ProcXIDeleteProperty(client)); } @@ -1291,6 +1289,7 @@ int SProcXIGetProperty(ClientPtr client) { REQUEST(xXIGetPropertyReq); + REQUEST_SIZE_MATCH(xXIGetPropertyReq); swaps(&stuff->length); swaps(&stuff->deviceid); @@ -1298,7 +1297,6 @@ SProcXIGetProperty(ClientPtr client) swapl(&stuff->type); swapl(&stuff->offset); swapl(&stuff->len); - REQUEST_SIZE_MATCH(xXIGetPropertyReq); return (ProcXIGetProperty(client)); } diff --git a/Xi/xiquerydevice.c b/Xi/xiquerydevice.c index 4e544f0..67a9a4f 100644 --- a/Xi/xiquerydevice.c +++ b/Xi/xiquerydevice.c @@ -54,6 +54,7 @@ int SProcXIQueryDevice(ClientPtr client) { REQUEST(xXIQueryDeviceReq); + REQUEST_SIZE_MATCH(xXIQueryDeviceReq); swaps(&stuff->length); swaps(&stuff->deviceid); diff --git a/Xi/xiquerypointer.c b/Xi/xiquerypointer.c index e9bdd42..7ec0c85 100644 --- a/Xi/xiquerypointer.c +++ b/Xi/xiquerypointer.c @@ -63,6 +63,8 @@ int SProcXIQueryPointer(ClientPtr client) { REQUEST(xXIQueryPointerReq); + REQUEST_SIZE_MATCH(xXIQueryPointerReq); + swaps(&stuff->length); swaps(&stuff->deviceid); swapl(&stuff->win); diff --git a/Xi/xiselectev.c b/Xi/xiselectev.c index 45a996e..168579f 100644 --- a/Xi/xiselectev.c +++ b/Xi/xiselectev.c @@ -114,6 +114,7 @@ int SProcXISelectEvents(ClientPtr client) { int i; + int len; xXIEventMask *evmask; REQUEST(xXISelectEventsReq); @@ -122,10 +123,17 @@ SProcXISelectEvents(ClientPtr client) swapl(&stuff->win); swaps(&stuff->num_masks); + len = stuff->length - bytes_to_int32(sizeof(xXISelectEventsReq)); evmask = (xXIEventMask *) &stuff[1]; for (i = 0; i < stuff->num_masks; i++) { + if (len < bytes_to_int32(sizeof(xXIEventMask))) + return BadLength; + len -= bytes_to_int32(sizeof(xXIEventMask)); swaps(&evmask->deviceid); swaps(&evmask->mask_len); + if (len < evmask->mask_len) + return BadLength; + len -= evmask->mask_len; evmask = (xXIEventMask *) (((char *) &evmask[1]) + evmask->mask_len * 4); } diff --git a/Xi/xisetclientpointer.c b/Xi/xisetclientpointer.c index 38ff51e..24d4a53 100644 --- a/Xi/xisetclientpointer.c +++ b/Xi/xisetclientpointer.c @@ -51,10 +51,11 @@ int SProcXISetClientPointer(ClientPtr client) { REQUEST(xXISetClientPointerReq); + REQUEST_SIZE_MATCH(xXISetClientPointerReq); + swaps(&stuff->length); swapl(&stuff->win); swaps(&stuff->deviceid); - REQUEST_SIZE_MATCH(xXISetClientPointerReq); return (ProcXISetClientPointer(client)); } diff --git a/Xi/xisetdevfocus.c b/Xi/xisetdevfocus.c index 372ec24..96a9a16 100644 --- a/Xi/xisetdevfocus.c +++ b/Xi/xisetdevfocus.c @@ -44,6 +44,8 @@ int SProcXISetFocus(ClientPtr client) { REQUEST(xXISetFocusReq); + REQUEST_AT_LEAST_SIZE(xXISetFocusReq); + swaps(&stuff->length); swaps(&stuff->deviceid); swapl(&stuff->focus); @@ -56,6 +58,8 @@ int SProcXIGetFocus(ClientPtr client) { REQUEST(xXIGetFocusReq); + REQUEST_AT_LEAST_SIZE(xXIGetFocusReq); + swaps(&stuff->length); swaps(&stuff->deviceid); diff --git a/Xi/xiwarppointer.c b/Xi/xiwarppointer.c index 3f051f7..780758a 100644 --- a/Xi/xiwarppointer.c +++ b/Xi/xiwarppointer.c @@ -56,6 +56,8 @@ int SProcXIWarpPointer(ClientPtr client) { REQUEST(xXIWarpPointerReq); + REQUEST_SIZE_MATCH(xXIWarpPointerReq); + swaps(&stuff->length); swapl(&stuff->src_win); swapl(&stuff->dst_win); diff --git a/include/dix.h b/include/dix.h index e0c6ed8..21176a8 100644 --- a/include/dix.h +++ b/include/dix.h @@ -74,6 +74,10 @@ SOFTWARE. if ((sizeof(req) >> 2) > client->req_len )\ return(BadLength) +#define REQUEST_AT_LEAST_EXTRA_SIZE(req, extra) \ + if (((sizeof(req) + ((uint64_t) extra)) >> 2) > client->req_len ) \ + return(BadLength) + #define REQUEST_FIXED_SIZE(req, n)\ if (((sizeof(req) >> 2) > client->req_len) || \ ((n >> 2) >= client->req_len) || \ -- 1.7.9.2
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