Date: Fri, 16 Oct 2015 11:24:53 +0200 From: Florian Weimer <fweimer@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: CVE Request: Linux Kernel heap corruption on debug_read_tlb On 10/15/2015 03:53 PM, Greg KH wrote: > On Thu, Oct 15, 2015 at 10:30:04AM +0200, Salva Peiró wrote: >> Hello, >> >> Is there a CVE for this? If not, could one be assigned, please? >> >> https://patchwork.kernel.org/patch/6853351/ >> commit e203db293863fa15b4b1917d4398fb5bd63c4e88 >> iommu/omap: Fix debug_read_tlb() to use seq_printf() >> >> The debug_read_tlb() uses the sprintf() functions directly on the >> buffer >> allocated by buf = kmalloc(count), without taking into account the size >> of the buffer, with the consequence corrupting the heap, depending on >> the count requested by the user. >> >> The patch fixes the issue replacing sprintf() by seq_printf(). > > For a root-only-readable file? Why is a CVE needed? Fedora and downstreams do not system-level access to the root user by default, as a result of the custom Secure Boot patches. This does not matter for pure denial-of-service bugs of course, but this bug looks like something that might allow code execution. Florian
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