From 2a7e737278a83721fef8b2a7b1a4fa3abfe7b3c4 Mon Sep 17 00:00:00 2001 From: "Brian P. Hinz" Date: Sun, 1 Mar 2015 14:03:48 -0500 Subject: [PATCH] Apply Xorg CVE-2015-0255 patches to el5 & generic build --- .../rpm/el5/SOURCES/CVE-2015-0255.patch | 240 ++++++++++++++++++ contrib/packages/rpm/el5/SPECS/tigervnc.spec | 2 + 2 files changed, 242 insertions(+) create mode 100644 contrib/packages/rpm/el5/SOURCES/CVE-2015-0255.patch diff --git a/contrib/packages/rpm/el5/SOURCES/CVE-2015-0255.patch b/contrib/packages/rpm/el5/SOURCES/CVE-2015-0255.patch new file mode 100644 index 00000000..32e56812 --- /dev/null +++ b/contrib/packages/rpm/el5/SOURCES/CVE-2015-0255.patch @@ -0,0 +1,240 @@ +From 81c90dc8f0aae3b65730409b1b615b5fa7280ebd Mon Sep 17 00:00:00 2001 +From: Olivier Fourdan +Date: Fri, 16 Jan 2015 20:08:59 +0100 +Subject: xkb: Don't swap XkbSetGeometry data in the input buffer + +The XkbSetGeometry request embeds data which needs to be swapped when the +server and the client have different endianess. + +_XkbSetGeometry() invokes functions that swap these data directly in the +input buffer. + +However, ProcXkbSetGeometry() may call _XkbSetGeometry() more than once +(if there is more than one keyboard), thus causing on swapped clients the +same data to be swapped twice in memory, further causing a server crash +because the strings lengths on the second time are way off bounds. + +To allow _XkbSetGeometry() to run reliably more than once with swapped +clients, do not swap the data in the buffer, use variables instead. + +Signed-off-by: Olivier Fourdan +Signed-off-by: Peter Hutterer + +diff --git a/xkb/xkb.c b/xkb/xkb.c +index 15c7f34..b9a3ac4 100644 +--- a/xkb/xkb.c ++++ b/xkb/xkb.c +@@ -4961,14 +4961,13 @@ static char * + _GetCountedString(char **wire_inout, Bool swap) + { + char *wire, *str; +- CARD16 len, *plen; ++ CARD16 len; + + wire = *wire_inout; +- plen = (CARD16 *) wire; ++ len = *(CARD16 *) wire; + if (swap) { +- swaps(plen); ++ swaps(&len); + } +- len = *plen; + str = malloc(len + 1); + if (str) { + memcpy(str, &wire[2], len); +@@ -4985,25 +4984,28 @@ _CheckSetDoodad(char **wire_inout, + { + char *wire; + xkbDoodadWireDesc *dWire; ++ xkbAnyDoodadWireDesc any; ++ xkbTextDoodadWireDesc text; + XkbDoodadPtr doodad; + + dWire = (xkbDoodadWireDesc *) (*wire_inout); ++ any = dWire->any; + wire = (char *) &dWire[1]; + if (client->swapped) { +- swapl(&dWire->any.name); +- swaps(&dWire->any.top); +- swaps(&dWire->any.left); +- swaps(&dWire->any.angle); ++ swapl(&any.name); ++ swaps(&any.top); ++ swaps(&any.left); ++ swaps(&any.angle); + } + CHK_ATOM_ONLY(dWire->any.name); +- doodad = XkbAddGeomDoodad(geom, section, dWire->any.name); ++ doodad = XkbAddGeomDoodad(geom, section, any.name); + if (!doodad) + return BadAlloc; + doodad->any.type = dWire->any.type; + doodad->any.priority = dWire->any.priority; +- doodad->any.top = dWire->any.top; +- doodad->any.left = dWire->any.left; +- doodad->any.angle = dWire->any.angle; ++ doodad->any.top = any.top; ++ doodad->any.left = any.left; ++ doodad->any.angle = any.angle; + switch (doodad->any.type) { + case XkbOutlineDoodad: + case XkbSolidDoodad: +@@ -5026,12 +5028,13 @@ _CheckSetDoodad(char **wire_inout, + dWire->text.colorNdx); + return BadMatch; + } ++ text = dWire->text; + if (client->swapped) { +- swaps(&dWire->text.width); +- swaps(&dWire->text.height); ++ swaps(&text.width); ++ swaps(&text.height); + } +- doodad->text.width = dWire->text.width; +- doodad->text.height = dWire->text.height; ++ doodad->text.width = text.width; ++ doodad->text.height = text.height; + doodad->text.color_ndx = dWire->text.colorNdx; + doodad->text.text = _GetCountedString(&wire, client->swapped); + doodad->text.font = _GetCountedString(&wire, client->swapped); +-- +cgit v0.10.2 + +From 20079c36cf7d377938ca5478447d8b9045cb7d43 Mon Sep 17 00:00:00 2001 +From: Olivier Fourdan +Date: Fri, 16 Jan 2015 08:44:45 +0100 +Subject: xkb: Check strings length against request size + +Ensure that the given strings length in an XkbSetGeometry request remain +within the limits of the size of the request. + +Signed-off-by: Olivier Fourdan +Reviewed-by: Peter Hutterer +Signed-off-by: Peter Hutterer + +diff --git a/xkb/xkb.c b/xkb/xkb.c +index b9a3ac4..f3988f9 100644 +--- a/xkb/xkb.c ++++ b/xkb/xkb.c +@@ -4957,25 +4957,29 @@ ProcXkbGetGeometry(ClientPtr client) + + /***====================================================================***/ + +-static char * +-_GetCountedString(char **wire_inout, Bool swap) ++static Status ++_GetCountedString(char **wire_inout, ClientPtr client, char **str) + { +- char *wire, *str; ++ char *wire, *next; + CARD16 len; + + wire = *wire_inout; + len = *(CARD16 *) wire; +- if (swap) { ++ if (client->swapped) { + swaps(&len); + } +- str = malloc(len + 1); +- if (str) { +- memcpy(str, &wire[2], len); +- str[len] = '\0'; +- } +- wire += XkbPaddedSize(len + 2); +- *wire_inout = wire; +- return str; ++ next = wire + XkbPaddedSize(len + 2); ++ /* Check we're still within the size of the request */ ++ if (client->req_len < ++ bytes_to_int32(next - (char *) client->requestBuffer)) ++ return BadValue; ++ *str = malloc(len + 1); ++ if (!*str) ++ return BadAlloc; ++ memcpy(*str, &wire[2], len); ++ *(*str + len) = '\0'; ++ *wire_inout = next; ++ return Success; + } + + static Status +@@ -4987,6 +4991,7 @@ _CheckSetDoodad(char **wire_inout, + xkbAnyDoodadWireDesc any; + xkbTextDoodadWireDesc text; + XkbDoodadPtr doodad; ++ Status status; + + dWire = (xkbDoodadWireDesc *) (*wire_inout); + any = dWire->any; +@@ -5036,8 +5041,14 @@ _CheckSetDoodad(char **wire_inout, + doodad->text.width = text.width; + doodad->text.height = text.height; + doodad->text.color_ndx = dWire->text.colorNdx; +- doodad->text.text = _GetCountedString(&wire, client->swapped); +- doodad->text.font = _GetCountedString(&wire, client->swapped); ++ status = _GetCountedString(&wire, client, &doodad->text.text); ++ if (status != Success) ++ return status; ++ status = _GetCountedString(&wire, client, &doodad->text.font); ++ if (status != Success) { ++ free (doodad->text.text); ++ return status; ++ } + break; + case XkbIndicatorDoodad: + if (dWire->indicator.onColorNdx >= geom->num_colors) { +@@ -5072,7 +5083,9 @@ _CheckSetDoodad(char **wire_inout, + } + doodad->logo.color_ndx = dWire->logo.colorNdx; + doodad->logo.shape_ndx = dWire->logo.shapeNdx; +- doodad->logo.logo_name = _GetCountedString(&wire, client->swapped); ++ status = _GetCountedString(&wire, client, &doodad->logo.logo_name); ++ if (status != Success) ++ return status; + break; + default: + client->errorValue = _XkbErrCode2(0x4F, dWire->any.type); +@@ -5304,18 +5317,20 @@ _CheckSetGeom(XkbGeometryPtr geom, xkbSetGeometryReq * req, ClientPtr client) + char *wire; + + wire = (char *) &req[1]; +- geom->label_font = _GetCountedString(&wire, client->swapped); ++ status = _GetCountedString(&wire, client, &geom->label_font); ++ if (status != Success) ++ return status; + + for (i = 0; i < req->nProperties; i++) { + char *name, *val; + +- name = _GetCountedString(&wire, client->swapped); +- if (!name) +- return BadAlloc; +- val = _GetCountedString(&wire, client->swapped); +- if (!val) { ++ status = _GetCountedString(&wire, client, &name); ++ if (status != Success) ++ return status; ++ status = _GetCountedString(&wire, client, &val); ++ if (status != Success) { + free(name); +- return BadAlloc; ++ return status; + } + if (XkbAddGeomProperty(geom, name, val) == NULL) { + free(name); +@@ -5349,9 +5364,9 @@ _CheckSetGeom(XkbGeometryPtr geom, xkbSetGeometryReq * req, ClientPtr client) + for (i = 0; i < req->nColors; i++) { + char *name; + +- name = _GetCountedString(&wire, client->swapped); +- if (!name) +- return BadAlloc; ++ status = _GetCountedString(&wire, client, &name); ++ if (status != Success) ++ return status; + if (!XkbAddGeomColor(geom, name, geom->num_colors)) { + free(name); + return BadAlloc; +-- +cgit v0.10.2 + diff --git a/contrib/packages/rpm/el5/SPECS/tigervnc.spec b/contrib/packages/rpm/el5/SPECS/tigervnc.spec index 2c8bc718..774bc25b 100644 --- a/contrib/packages/rpm/el5/SPECS/tigervnc.spec +++ b/contrib/packages/rpm/el5/SPECS/tigervnc.spec @@ -182,6 +182,7 @@ Patch121: freetype-2.3.11-CVE-2012-5669.patch # https://release.debian.org/proposed-updates/stable_diffs/xorg-server_1.12.4-6+deb7u5.debdiff Patch10000: 16_CVE-2014-mult.diff Patch10001: 17_CVE-regressions.diff +Patch10002: CVE-2015-0255.patch %description Virtual Network Computing (VNC) is a remote display system which @@ -396,6 +397,7 @@ tar xjf %SOURCE204 pushd xorg-server-1* %patch10000 -p1 -b .CVE-2014-mult %patch10001 -p1 -b .CVE-regressions +%patch10002 -p1 -b .CVE-2015-0255 for f in `find . -type f -perm -000`; do chmod +r "$f" done -- 2.39.5