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Wed, 19 Jun 2019 15:55:59 +0000 Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x5JFtpTh010454; Wed, 19 Jun 2019 15:55:51 GMT Received: from [10.65.164.174] (/10.65.164.174) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 19 Jun 2019 08:55:51 -0700 Subject: Re: [PATCH v17 04/15] mm, arm64: untag user pointers passed to memory syscalls To: Andrey Konovalov , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy References: From: Khalid Aziz Organization: Oracle Corp Message-ID: Date: Wed, 19 Jun 2019 09:55:45 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9293 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906190128 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9293 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906190128 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: On 6/12/19 5:43 AM, Andrey Konovalov wrote: > This patch is a part of a series that extends arm64 kernel ABI to allow= to > pass tagged user pointers (with the top byte set to something else othe= r > than 0x00) as syscall arguments. >=20 > This patch allows tagged pointers to be passed to the following memory > syscalls: get_mempolicy, madvise, mbind, mincore, mlock, mlock2, mprote= ct, > mremap, msync, munlock, move_pages. >=20 > The mmap and mremap syscalls do not currently accept tagged addresses. > Architectures may interpret the tag as a background colour for the > corresponding vma. >=20 > Reviewed-by: Catalin Marinas > Reviewed-by: Kees Cook > Signed-off-by: Andrey Konovalov > --- Reviewed-by: Khalid Aziz > mm/madvise.c | 2 ++ > mm/mempolicy.c | 3 +++ > mm/migrate.c | 2 +- > mm/mincore.c | 2 ++ > mm/mlock.c | 4 ++++ > mm/mprotect.c | 2 ++ > mm/mremap.c | 7 +++++++ > mm/msync.c | 2 ++ > 8 files changed, 23 insertions(+), 1 deletion(-) >=20 > diff --git a/mm/madvise.c b/mm/madvise.c > index 628022e674a7..39b82f8a698f 100644 > --- a/mm/madvise.c > +++ b/mm/madvise.c > @@ -810,6 +810,8 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size= _t, len_in, int, behavior) > size_t len; > struct blk_plug plug; > =20 > + start =3D untagged_addr(start); > + > if (!madvise_behavior_valid(behavior)) > return error; > =20 > diff --git a/mm/mempolicy.c b/mm/mempolicy.c > index 01600d80ae01..78e0a88b2680 100644 > --- a/mm/mempolicy.c > +++ b/mm/mempolicy.c > @@ -1360,6 +1360,7 @@ static long kernel_mbind(unsigned long start, uns= igned long len, > int err; > unsigned short mode_flags; > =20 > + start =3D untagged_addr(start); > mode_flags =3D mode & MPOL_MODE_FLAGS; > mode &=3D ~MPOL_MODE_FLAGS; > if (mode >=3D MPOL_MAX) > @@ -1517,6 +1518,8 @@ static int kernel_get_mempolicy(int __user *polic= y, > int uninitialized_var(pval); > nodemask_t nodes; > =20 > + addr =3D untagged_addr(addr); > + > if (nmask !=3D NULL && maxnode < nr_node_ids) > return -EINVAL; > =20 > diff --git a/mm/migrate.c b/mm/migrate.c > index f2ecc2855a12..d22c45cf36b2 100644 > --- a/mm/migrate.c > +++ b/mm/migrate.c > @@ -1616,7 +1616,7 @@ static int do_pages_move(struct mm_struct *mm, no= demask_t task_nodes, > goto out_flush; > if (get_user(node, nodes + i)) > goto out_flush; > - addr =3D (unsigned long)p; > + addr =3D (unsigned long)untagged_addr(p); > =20 > err =3D -ENODEV; > if (node < 0 || node >=3D MAX_NUMNODES) > diff --git a/mm/mincore.c b/mm/mincore.c > index c3f058bd0faf..64c322ed845c 100644 > --- a/mm/mincore.c > +++ b/mm/mincore.c > @@ -249,6 +249,8 @@ SYSCALL_DEFINE3(mincore, unsigned long, start, size= _t, len, > unsigned long pages; > unsigned char *tmp; > =20 > + start =3D untagged_addr(start); > + > /* Check the start address: needs to be page-aligned.. */ > if (start & ~PAGE_MASK) > return -EINVAL; > diff --git a/mm/mlock.c b/mm/mlock.c > index 080f3b36415b..e82609eaa428 100644 > --- a/mm/mlock.c > +++ b/mm/mlock.c > @@ -674,6 +674,8 @@ static __must_check int do_mlock(unsigned long star= t, size_t len, vm_flags_t fla > unsigned long lock_limit; > int error =3D -ENOMEM; > =20 > + start =3D untagged_addr(start); > + > if (!can_do_mlock()) > return -EPERM; > =20 > @@ -735,6 +737,8 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size= _t, len) > { > int ret; > =20 > + start =3D untagged_addr(start); > + > len =3D PAGE_ALIGN(len + (offset_in_page(start))); > start &=3D PAGE_MASK; > =20 > diff --git a/mm/mprotect.c b/mm/mprotect.c > index bf38dfbbb4b4..19f981b733bc 100644 > --- a/mm/mprotect.c > +++ b/mm/mprotect.c > @@ -465,6 +465,8 @@ static int do_mprotect_pkey(unsigned long start, si= ze_t len, > const bool rier =3D (current->personality & READ_IMPLIES_EXEC) && > (prot & PROT_READ); > =20 > + start =3D untagged_addr(start); > + > prot &=3D ~(PROT_GROWSDOWN|PROT_GROWSUP); > if (grows =3D=3D (PROT_GROWSDOWN|PROT_GROWSUP)) /* can't be both */ > return -EINVAL; > diff --git a/mm/mremap.c b/mm/mremap.c > index fc241d23cd97..64c9a3b8be0a 100644 > --- a/mm/mremap.c > +++ b/mm/mremap.c > @@ -606,6 +606,13 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsig= ned long, old_len, > LIST_HEAD(uf_unmap_early); > LIST_HEAD(uf_unmap); > =20 > + /* > + * Architectures may interpret the tag passed to mmap as a background= > + * colour for the corresponding vma. For mremap we don't allow tagged= > + * new_addr to preserve similar behaviour to mmap. > + */ > + addr =3D untagged_addr(addr); > + > if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE)) > return ret; > =20 > diff --git a/mm/msync.c b/mm/msync.c > index ef30a429623a..c3bd3e75f687 100644 > --- a/mm/msync.c > +++ b/mm/msync.c > @@ -37,6 +37,8 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, = len, int, flags) > int unmapped_error =3D 0; > int error =3D -EINVAL; > =20 > + start =3D untagged_addr(start); > + > if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC)) > goto out; > if (offset_in_page(start)) >=20