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Message-ID: <53ECEFF5.1040800@zytor.com> Date: Thu, 14 Aug 2014 10:20:53 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Dave Hansen <dave.hansen@...el.com>, Frantisek Hrbata <fhrbata@...hat.com>, linux-kernel@...r.kernel.org CC: linux-mm@...ck.org, tglx@...utronix.de, mingo@...hat.com, x86@...nel.org, oleg@...hat.com, kamaleshb@...ibm.com, hechjie@...ibm.com, akpm@...ux-foundation.org, dvlasenk@...hat.com, prarit@...hat.com, lwoodman@...hat.com, hannsj_uhl@...ibm.com Subject: Re: [PATCH 1/1] x86: add phys addr validity check for /dev/mem mmap On 08/14/2014 09:36 AM, Dave Hansen wrote: > Thanks for dredging this back up! > > On 08/14/2014 07:18 AM, Frantisek Hrbata wrote: >> +int valid_phys_addr_range(phys_addr_t addr, size_t count) >> +{ >> + return addr + count <= __pa(high_memory); >> +} > > Is this correct on 32-bit? It would limit /dev/mem to memory below 896MB. > Last I checked, /dev/mem was already broken for highmem... which is actually a problem. I would prefer to see it fixed. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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