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[193.116.119.33]) by smtp.gmail.com with ESMTPSA id a25sm923809pfo.200.2021.08.25.19.46.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Aug 2021 19:46:40 -0700 (PDT) Date: Thu, 26 Aug 2021 12:46:34 +1000 From: Nicholas Piggin Subject: Re: [PATCH 2/2] mm: don't allow executable ioremap mappings To: Andrew Morton , Christoph Hellwig Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Peter Zijlstra References: <20210824091259.1324527-1-hch@lst.de> <20210824091259.1324527-3-hch@lst.de> In-Reply-To: <20210824091259.1324527-3-hch@lst.de> MIME-Version: 1.0 Message-Id: <1629945413.hwbzjjtfbl.astroid@bobo.none> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 79B18D017A7F Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=KqdjzpEY; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf21.hostedemail.com: domain of npiggin@gmail.com designates 209.85.215.180 as permitted sender) smtp.mailfrom=npiggin@gmail.com X-Rspamd-Server: rspam01 X-Stat-Signature: x6yodwis4i4n6fzfdeq54in1ikwd7agx X-HE-Tag: 1629946001-93984 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Excerpts from Christoph Hellwig's message of August 24, 2021 7:12 pm: > There is no need to execute from iomem (and most platforms it is > impossible anyway), so add the pgprot_nx() call similar to vmap. >=20 > Signed-off-by: Christoph Hellwig > --- > mm/vmalloc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) >=20 > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > index e44983fb2d15..3055f04b486b 100644 > --- a/mm/vmalloc.c > +++ b/mm/vmalloc.c > @@ -316,7 +316,7 @@ int ioremap_page_range(unsigned long addr, unsigned l= ong end, > { > int err; > =20 > - err =3D vmap_range_noflush(addr, end, phys_addr, prot, > + err =3D vmap_range_noflush(addr, end, phys_addr, pgprot_nx(prot), > ioremap_max_page_shift); I can't see why this is a problem. powerpcs can but it seems like a bad=20 idea anyway. Any point to a WARN_ON or return -EINVAL? Hmm, maybe that doesn't work=20 for archs that don't support NX. We could add a check for ones that do=20 support it though... But that's for another patch. Thanks, Nick