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CVE-2013-7439).
MakeBigReq inserts a length field after the first 4 bytes of the request
(after req->length), pushing everything else back by 4 bytes.
The current memmove moves everything but the first 4 bytes back. If a
request aligns to the end of the buffer pointer when MakeBigReq is
invoked for that request, this runs over the buffer. Instead, we need to
memmove minus the first 4 bytes (which aren't moved), minus the last 4
bytes (so we still align to the previous tail).
The 4 bytes that fell out are already handled with Data32, which will
handle the buffermax correctly.
The case where req->length = 1 was already not functional.
Reported by Abhishek Arya <inferno@chromium.org> (against X.Org BTS).
https://bugzilla.mozilla.org/show_bug.cgi?id=803762
Reviewed-by: Jeff Muizelaar <jmuizelaar@mozilla.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Rebased-for-NX: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
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WORD64, WORD64ALIGN, MUSTCOPY, UNSIGNEDBITFIELDS definitions).
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Summary: Imported nx-X11-3.5.0-1.tar.gz
Keywords:
Imported nx-X11-3.5.0-1.tar.gz
into Git repository
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Summary: Imported nx-X11-3.4.0-3.tar.gz
Keywords:
Imported nx-X11-3.4.0-3.tar.gz
into Git repository
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Summary: Imported nx-X11-3.4.0-1.tar.gz
Keywords:
Imported nx-X11-3.4.0-1.tar.gz
into Git repository
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Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:
Imported nx-X11-3.1.0-1.tar.gz
into Git repository
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