diff options
Diffstat (limited to 'gnu/packages/patches/libxtst-CVE-2016-7951-CVE-2016-7952.patch')
| -rw-r--r-- | gnu/packages/patches/libxtst-CVE-2016-7951-CVE-2016-7952.patch | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/gnu/packages/patches/libxtst-CVE-2016-7951-CVE-2016-7952.patch b/gnu/packages/patches/libxtst-CVE-2016-7951-CVE-2016-7952.patch new file mode 100644 index 0000000000..9df6cf3f4d --- /dev/null +++ b/gnu/packages/patches/libxtst-CVE-2016-7951-CVE-2016-7952.patch @@ -0,0 +1,152 @@ +Fix CVE-2016-7951 and CVE-2016-7952 + +https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7951 +https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7952 + +Patch copied from upstream source repository: + +https://cgit.freedesktop.org/xorg/lib/libXtst/commit/?id=9556ad67af3129ec4a7a4f4b54a0d59701beeae3 + +From 9556ad67af3129ec4a7a4f4b54a0d59701beeae3 Mon Sep 17 00:00:00 2001 +From: Tobias Stoeckmann <tobias@stoeckmann.org> +Date: Sun, 25 Sep 2016 21:37:01 +0200 +Subject: [PATCH] Out of boundary access and endless loop in libXtst + +A lack of range checks in libXtst allows out of boundary accesses. +The checks have to be done in-place here, because it cannot be done +without in-depth knowledge of the read data. + +If XRecordStartOfData, XRecordEndOfData, or XRecordClientDied +without a client sequence have attached data, an endless loop would +occur. The do-while-loop continues until the current index reaches +the end. But in these cases, the current index would not be +incremented, leading to an endless processing. + +Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org> +Reviewed-by: Matthieu Herrb <matthieu@herrb.eu> +--- + src/XRecord.c | 43 +++++++++++++++++++++++++++++++++++++++---- + 1 file changed, 39 insertions(+), 4 deletions(-) + +diff --git a/src/XRecord.c b/src/XRecord.c +index 50420c0..fefd842 100644 +--- a/src/XRecord.c ++++ b/src/XRecord.c +@@ -749,15 +749,23 @@ parse_reply_call_callback( + switch (rep->category) { + case XRecordFromServer: + if (rep->elementHeader&XRecordFromServerTime) { ++ if (current_index + 4 > rep->length << 2) ++ return Error; + EXTRACT_CARD32(rep->clientSwapped, + reply->buf+current_index, + data->server_time); + current_index += 4; + } ++ if (current_index + 1 > rep->length << 2) ++ return Error; + switch (reply->buf[current_index]) { + case X_Reply: /* reply */ ++ if (current_index + 8 > rep->length << 2) ++ return Error; + EXTRACT_CARD32(rep->clientSwapped, + reply->buf+current_index+4, datum_bytes); ++ if (datum_bytes < 0 || datum_bytes > ((INT_MAX >> 2) - 8)) ++ return Error; + datum_bytes = (datum_bytes+8) << 2; + break; + default: /* error or event */ +@@ -766,52 +774,73 @@ parse_reply_call_callback( + break; + case XRecordFromClient: + if (rep->elementHeader&XRecordFromClientTime) { ++ if (current_index + 4 > rep->length << 2) ++ return Error; + EXTRACT_CARD32(rep->clientSwapped, + reply->buf+current_index, + data->server_time); + current_index += 4; + } + if (rep->elementHeader&XRecordFromClientSequence) { ++ if (current_index + 4 > rep->length << 2) ++ return Error; + EXTRACT_CARD32(rep->clientSwapped, + reply->buf+current_index, + data->client_seq); + current_index += 4; + } ++ if (current_index + 4 > rep->length<<2) ++ return Error; + if (reply->buf[current_index+2] == 0 + && reply->buf[current_index+3] == 0) /* needn't swap 0 */ + { /* BIG-REQUESTS */ ++ if (current_index + 8 > rep->length << 2) ++ return Error; + EXTRACT_CARD32(rep->clientSwapped, + reply->buf+current_index+4, datum_bytes); + } else { + EXTRACT_CARD16(rep->clientSwapped, + reply->buf+current_index+2, datum_bytes); + } ++ if (datum_bytes < 0 || datum_bytes > INT_MAX >> 2) ++ return Error; + datum_bytes <<= 2; + break; + case XRecordClientStarted: ++ if (current_index + 8 > rep->length << 2) ++ return Error; + EXTRACT_CARD16(rep->clientSwapped, + reply->buf+current_index+6, datum_bytes); + datum_bytes = (datum_bytes+2) << 2; + break; + case XRecordClientDied: + if (rep->elementHeader&XRecordFromClientSequence) { ++ if (current_index + 4 > rep->length << 2) ++ return Error; + EXTRACT_CARD32(rep->clientSwapped, + reply->buf+current_index, + data->client_seq); + current_index += 4; +- } +- /* fall through */ ++ } else if (current_index < rep->length << 2) ++ return Error; ++ datum_bytes = 0; ++ break; + case XRecordStartOfData: + case XRecordEndOfData: ++ if (current_index < rep->length << 2) ++ return Error; + datum_bytes = 0; ++ break; + } + + if (datum_bytes > 0) { +- if (current_index + datum_bytes > rep->length << 2) ++ if (INT_MAX - datum_bytes < (rep->length << 2) - current_index) { + fprintf(stderr, + "XRecord: %lu-byte reply claims %d-byte element (seq %lu)\n", +- (long)rep->length << 2, current_index + datum_bytes, ++ (unsigned long)rep->length << 2, current_index + datum_bytes, + dpy->last_request_read); ++ return Error; ++ } + /* + * This assignment (and indeed the whole buffer sharing + * scheme) assumes arbitrary 4-byte boundaries are +@@ -863,6 +892,12 @@ XRecordEnableContext(Display *dpy, XRecordContext context, + return 0; + } + ++ if (rep.length > INT_MAX >> 2) { ++ UnlockDisplay(dpy); ++ SyncHandle(); ++ return 0; ++ } ++ + if (rep.length > 0) { + reply = alloc_reply_buffer(info, rep.length<<2); + if (!reply) { +-- +2.10.1 + |