Date: Mon, 2 May 2011 14:59:01 -0400 (EDT) From: Josh Bressers <bressers@...hat.com> To: oss-security@...ts.openwall.com Cc: coley <coley@...re.org> Subject: Re: CVE request: kernel (ARM): heap corruption in OABI semtimedop ----- Original Message ----- > The OABI wrapper for semtimedop does not bound the nsops argument. A > sufficiently large value will cause an integer overflow in allocation > size, followed by copying too much data into the allocated buffer. > This only affects ARM systems with CONFIG_OABI_COMPAT set. > > This is exploitable for local privilege escalation, but successful > exploitation requires winning a race. Because user-to-kernel copy > functions on ARM zero the destination buffer even on failure to access > the provided user pointer, the copy loop in the vulnerable function > that causes the overflow will zero out large amounts of kernel heap if > not interrupted, crashing the system. This should be possible to work > around though. > > -Dan > >  http://marc.info/?l=linux-kernel&m=130408851326428&w=2 Please use CVE-2011-1759. Thanks. -- JB
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