Messages in this thread | | | Date | Thu, 24 Jul 2014 08:48:34 -0400 | From | Sasha Levin <> | Subject | Re: [PATCHv3 1/2] mm: introduce vm_ops->map_pages() |
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On 07/24/2014 02:53 AM, Andrey Ryabinin wrote: > On 07/24/14 07:33, Sasha Levin wrote: >> > On 02/27/2014 02:53 PM, Kirill A. Shutemov wrote: >>> >> The patch introduces new vm_ops callback ->map_pages() and uses it for >>> >> mapping easy accessible pages around fault address. >>> >> >>> >> On read page fault, if filesystem provides ->map_pages(), we try to map >>> >> up to FAULT_AROUND_PAGES pages around page fault address in hope to >>> >> reduce number of minor page faults. >>> >> >>> >> We call ->map_pages first and use ->fault() as fallback if page by the >>> >> offset is not ready to be mapped (cold page cache or something). >>> >> >>> >> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> >>> >> --- >> > >> > Hi all, >> > >> > This patch triggers use-after-free when fuzzing using trinity and the KASAN >> > patchset. >> > > I think this should be fixed already by following patch: > > From: Konstantin Khlebnikov <koct9i@gmail.com> > Subject: mm: do not call do_fault_around for non-linear fault
I don't think so. It's supposed to deal with a different issue, and it was already in my -next tree which triggered the issue I've reported.
Thanks, Sasha
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