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xorg-x11-server/0001-Disallow-byte-swapped-clients-by-default.patch
Peter Hutterer e6bf129b81 Disallow byte-swapped clients (#2159489)
2023-01-13 15:46:50 +10:00

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From 73d6e888c6058b28a0e87ab65aa4172b17d8327d Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Mon, 19 Dec 2022 10:34:29 +1000
Subject: [PATCH xserver] Fix some indentation issues
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
---
dix/dispatch.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/dix/dispatch.c b/dix/dispatch.c
index 210df75c63..e38a8fecaa 100644
--- a/dix/dispatch.c
+++ b/dix/dispatch.c
@@ -492,10 +492,10 @@ Dispatch(void)
if (!WaitForSomething(clients_are_ready()))
continue;
- /*****************
- * Handle events in round robin fashion, doing input between
- * each round
- *****************/
+ /*****************
+ * Handle events in round robin fashion, doing input between
+ * each round
+ *****************/
if (!dispatchException && clients_are_ready()) {
client = SmartScheduleClient();
@@ -3657,11 +3657,11 @@ ProcInitialConnection(ClientPtr client)
prefix = (xConnClientPrefix *) ((char *)stuff + sz_xReq);
order = prefix->byteOrder;
if (order != 'l' && order != 'B' && order != 'r' && order != 'R')
- return client->noClientException = -1;
+ return client->noClientException = -1;
if (((*(char *) &whichbyte) && (order == 'B' || order == 'R')) ||
- (!(*(char *) &whichbyte) && (order == 'l' || order == 'r'))) {
- client->swapped = TRUE;
- SwapConnClientPrefix(prefix);
+ (!(*(char *) &whichbyte) && (order == 'l' || order == 'r'))) {
+ client->swapped = TRUE;
+ SwapConnClientPrefix(prefix);
}
stuff->reqType = 2;
stuff->length += bytes_to_int32(prefix->nbytesAuthProto) +
@@ -3670,7 +3670,7 @@ ProcInitialConnection(ClientPtr client)
swaps(&stuff->length);
}
if (order == 'r' || order == 'R') {
- client->local = FALSE;
+ client->local = FALSE;
}
ResetCurrentRequest(client);
return Success;
@@ -3781,8 +3781,8 @@ ProcEstablishConnection(ClientPtr client)
auth_string = auth_proto + pad_to_int32(prefix->nbytesAuthProto);
if ((client->req_len << 2) != sz_xReq + sz_xConnClientPrefix +
- pad_to_int32(prefix->nbytesAuthProto) +
- pad_to_int32(prefix->nbytesAuthString))
+ pad_to_int32(prefix->nbytesAuthProto) +
+ pad_to_int32(prefix->nbytesAuthString))
reason = "Bad length";
else if ((prefix->majorVersion != X_PROTOCOL) ||
(prefix->minorVersion != X_PROTOCOL_REVISION))
--
2.39.0
From f69280ddcdd3115ee4717f22e85e0f43569b60dd Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Tue, 20 Dec 2022 11:40:16 +1000
Subject: [PATCH xserver] dix: localize two variables
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
---
dix/dispatch.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/dix/dispatch.c b/dix/dispatch.c
index c651c3d887..92be773e6c 100644
--- a/dix/dispatch.c
+++ b/dix/dispatch.c
@@ -3766,14 +3766,11 @@ int
ProcEstablishConnection(ClientPtr client)
{
const char *reason;
- char *auth_proto, *auth_string;
xConnClientPrefix *prefix;
REQUEST(xReq);
prefix = (xConnClientPrefix *) ((char *) stuff + sz_xReq);
- auth_proto = (char *) prefix + sz_xConnClientPrefix;
- auth_string = auth_proto + pad_to_int32(prefix->nbytesAuthProto);
if ((client->req_len << 2) != sz_xReq + sz_xConnClientPrefix +
pad_to_int32(prefix->nbytesAuthProto) +
@@ -3782,12 +3779,15 @@ ProcEstablishConnection(ClientPtr client)
else if ((prefix->majorVersion != X_PROTOCOL) ||
(prefix->minorVersion != X_PROTOCOL_REVISION))
reason = "Protocol version mismatch";
- else
+ else {
+ char *auth_proto = (char *) prefix + sz_xConnClientPrefix;
+ char *auth_string = auth_proto + pad_to_int32(prefix->nbytesAuthProto);
reason = ClientAuthorized(client,
(unsigned short) prefix->nbytesAuthProto,
auth_proto,
(unsigned short) prefix->nbytesAuthString,
auth_string);
+ }
return (SendConnSetup(client, reason));
}
--
2.39.0
From 412777664a20dd3561b936c02c96571a756fe9b2 Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Tue, 20 Dec 2022 10:42:03 +1000
Subject: [PATCH xserver] Disallow byte-swapped clients by default
The X server swapping code is a huge attack surface, much of this code
is untested and prone to security issues. The use-case of byte-swapped
clients is very niche, so let's disable this by default and allow it
only when the respective config option or commandline flag is given.
For Xorg, this adds the ServerFlag "AllowByteSwappedClients" "on".
For all DDX, this adds the commandline options +byteswappedclients and
-byteswappedclients to enable or disable, respectively.
Fixes #1201
https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1029
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
---
dix/dispatch.c | 4 +++-
hw/xfree86/common/xf86Config.c | 8 ++++++++
hw/xfree86/man/xorg.conf.man | 2 ++
hw/xwayland/xwayland.pc.in | 1 +
include/opaque.h | 2 ++
man/Xserver.man | 6 ++++++
os/utils.c | 9 +++++++++
7 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/dix/dispatch.c b/dix/dispatch.c
index 92be773e6c..9c26753a96 100644
--- a/dix/dispatch.c
+++ b/dix/dispatch.c
@@ -3772,7 +3772,9 @@ ProcEstablishConnection(ClientPtr client)
prefix = (xConnClientPrefix *) ((char *) stuff + sz_xReq);
- if ((client->req_len << 2) != sz_xReq + sz_xConnClientPrefix +
+ if (client->swapped && !AllowByteSwappedClients) {
+ reason = "Prohibited client endianess, see the Xserver man page ";
+ } else if ((client->req_len << 2) != sz_xReq + sz_xConnClientPrefix +
pad_to_int32(prefix->nbytesAuthProto) +
pad_to_int32(prefix->nbytesAuthString))
reason = "Bad length";
diff --git a/hw/xfree86/common/xf86Config.c b/hw/xfree86/common/xf86Config.c
index 5d814c1485..41acb25aa2 100644
--- a/hw/xfree86/common/xf86Config.c
+++ b/hw/xfree86/common/xf86Config.c
@@ -646,6 +646,7 @@ typedef enum {
FLAG_MAX_CLIENTS,
FLAG_IGLX,
FLAG_DEBUG,
+ FLAG_ALLOW_BYTE_SWAPPED_CLIENTS,
} FlagValues;
/**
@@ -705,6 +706,8 @@ static OptionInfoRec FlagOptions[] = {
{0}, FALSE},
{FLAG_DEBUG, "Debug", OPTV_STRING,
{0}, FALSE},
+ {FLAG_ALLOW_BYTE_SWAPPED_CLIENTS, "AllowByteSwappedClients", OPTV_BOOLEAN,
+ {0}, FALSE},
{-1, NULL, OPTV_NONE,
{0}, FALSE},
};
@@ -746,6 +749,11 @@ configServerFlags(XF86ConfFlagsPtr flagsconf, XF86OptionPtr layoutopts)
xf86Msg(X_CONFIG, "Ignoring ABI Version\n");
}
+ xf86GetOptValBool(FlagOptions, FLAG_ALLOW_BYTE_SWAPPED_CLIENTS, &AllowByteSwappedClients);
+ if (AllowByteSwappedClients) {
+ xf86Msg(X_CONFIG, "Allowing byte-swapped clients\n");
+ }
+
if (xf86IsOptionSet(FlagOptions, FLAG_AUTO_ADD_DEVICES)) {
xf86GetOptValBool(FlagOptions, FLAG_AUTO_ADD_DEVICES,
&xf86Info.autoAddDevices);
diff --git a/hw/xfree86/man/xorg.conf.man b/hw/xfree86/man/xorg.conf.man
index 01b47247ee..d057f26ecd 100644
--- a/hw/xfree86/man/xorg.conf.man
+++ b/hw/xfree86/man/xorg.conf.man
@@ -677,6 +677,8 @@ Possible values are
or
.BR sync .
Unset by default.
+.BI "Option \*qAllowByteSwappedClients\*q \*q" boolean \*q
+Allow clients with a different byte-order than the server. Disabled by default.
.SH "MODULE SECTION"
The
.B Module
diff --git a/include/opaque.h b/include/opaque.h
index 256261c2ad..398d4b4e51 100644
--- a/include/opaque.h
+++ b/include/opaque.h
@@ -74,4 +74,6 @@ extern _X_EXPORT Bool bgNoneRoot;
extern _X_EXPORT Bool CoreDump;
extern _X_EXPORT Bool NoListenAll;
+extern _X_EXPORT Bool AllowByteSwappedClients;
+
#endif /* OPAQUE_H */
diff --git a/man/Xserver.man b/man/Xserver.man
index 764bd1d907..e7adf9eb35 100644
--- a/man/Xserver.man
+++ b/man/Xserver.man
@@ -114,6 +114,12 @@ pattern. This is the default unless -retro or -wr is specified.
.B \-bs
disables backing store support on all screens.
.TP 8
+.B \+byteswappedclients
+Allow connections from clients with an endianess different to that of the server.
+.TP 8
+.B \-byteswappedclients
+Prohibit connections from clients with an endianess different to that of the server.
+.TP 8
.B \-c
turns off key-click.
.TP 8
diff --git a/os/utils.c b/os/utils.c
index fe94912f34..405bf7d8b4 100644
--- a/os/utils.c
+++ b/os/utils.c
@@ -189,6 +189,8 @@ Bool CoreDump;
Bool enableIndirectGLX = FALSE;
+Bool AllowByteSwappedClients = FALSE;
+
#ifdef PANORAMIX
Bool PanoramiXExtensionDisabledHack = FALSE;
#endif
@@ -523,6 +525,8 @@ UseMsg(void)
ErrorF("-br create root window with black background\n");
ErrorF("+bs enable any backing store support\n");
ErrorF("-bs disable any backing store support\n");
+ ErrorF("+byteswappedclients Allow clients with endianess different to that of the server\n");
+ ErrorF("-byteswappedclients Prohibit clients with endianess different to that of the server\n");
ErrorF("-c turns off key-click\n");
ErrorF("c # key-click volume (0-100)\n");
ErrorF("-cc int default color visual class\n");
@@ -720,6 +724,11 @@ ProcessCommandLine(int argc, char *argv[])
else
UseMsg();
}
+ else if (strcmp(argv[i], "-byteswappedclients") == 0) {
+ AllowByteSwappedClients = FALSE;
+ } else if (strcmp(argv[i], "+byteswappedclients") == 0) {
+ AllowByteSwappedClients = TRUE;
+ }
else if (strcmp(argv[i], "-br") == 0); /* default */
else if (strcmp(argv[i], "+bs") == 0)
enableBackingStore = TRUE;
--
2.39.0
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