From: "ext Ramirez Luna, Omar" <omar.ramirez@xxxxxx> Subject: RE: [PATCH 2/2] DSPBRIDGE: introduce VMA checking for cache operation Date: Tue, 4 Aug 2009 23:59:37 +0200 > Hi Doyu-san, > > >From: Hiroshi DOYU [mailto:Hiroshi.DOYU@xxxxxxxxx] > >Sent: Wednesday, July 22, 2009 3:23 AM > >To: linux-omap@xxxxxxxxxxxxxxx > >Cc: Menon, Nishanth; ameya.palande@xxxxxxxxx; Ramirez Luna, Omar; Guzman Lugo, Fernando; Kanigeri, > >Hari; Hiroshi DOYU > >Subject: [PATCH 2/2] DSPBRIDGE: introduce VMA checking for cache operation > > > >Check if the given area blongs to process virtul memory address space. > > > >Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@xxxxxxxxx> > >--- > > drivers/dsp/bridge/rmgr/proc.c | 32 ++++++++++++++++++++++++++++++++ > > 1 files changed, 32 insertions(+), 0 deletions(-) > > > > Is this patch solving any specific issue? Without this patch, there's quite serious risk that usreland applications can cause kernel crash on purpose. For exmaple, if you set NULL for "pMpuAddr", it always hits kernel oops at v7_dma_*(). It's same to any other address which doesn't belong to the process VMAs. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
