From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Dave Hansen <dave.hansen@linux.intel.com>,
Pawel Lebioda <pawel.lebioda@intel.com>,
Hugh Dickins <hughd@google.com>,
Dan Williams <dan.j.williams@intel.com>
Subject: [PATCH 4.8 11/33] device-dax: fix private mapping restriction, permit read-only
Date: Tue, 13 Dec 2016 09:16:12 -0800 [thread overview]
Message-ID: <20161213171534.646671474@linuxfoundation.org> (raw)
In-Reply-To: <20161213171534.171564506@linuxfoundation.org>
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Williams <dan.j.williams@intel.com>
commit 325896ffdf90f7cbd59fb873b7ba20d60d1ddf3c upstream.
Hugh notes in response to commit 4cb19355ea19 "device-dax: fail all
private mapping attempts":
"I think that is more restrictive than you intended: haven't tried, but I
believe it rejects a PROT_READ, MAP_SHARED, O_RDONLY fd mmap, leaving no
way to mmap /dev/dax without write permission to it."
Indeed it does restrict read-only mappings, switch to checking
VM_MAYSHARE, not VM_SHARED.
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Pawel Lebioda <pawel.lebioda@intel.com>
Fixes: 4cb19355ea19 ("device-dax: fail all private mapping attempts")
Reported-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/dax/dax.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -324,7 +324,7 @@ static int check_vma(struct dax_dev *dax
return -ENXIO;
/* prevent private mappings from being established */
- if ((vma->vm_flags & VM_SHARED) != VM_SHARED) {
+ if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {
dev_info(dev, "%s: %s: fail, attempted private mapping\n",
current->comm, func);
return -EINVAL;
next prev parent reply other threads:[~2016-12-13 17:19 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20161213171629epcas1p4dc2737fb27df6f1d6148edf348dde1c7@epcas1p4.samsung.com>
2016-12-13 17:16 ` [PATCH 4.8 00/33] 4.8.15-stable review Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 01/33] powerpc/eeh: Fix deadlock when PE frozen state cant be cleared Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 02/33] powerpc/mm: Fix lazy icache flush on pre-POWER5 Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 03/33] powerpc/boot: Fix build failure in 32-bit boot wrapper Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 04/33] fuse: fix clearing suid, sgid for chown() Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 05/33] parisc: Purge TLB before setting PTE Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 06/33] parisc: Remove unnecessary TLB purges from flush_dcache_page_asm and flush_icache_page_asm Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 07/33] parisc: Fix TLB related boot crash on SMP machines Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 08/33] zram: restrict add/remove attributes to root only Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 09/33] locking/rtmutex: Prevent dequeue vs. unlock race Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 10/33] locking/rtmutex: Use READ_ONCE() in rt_mutex_owner() Greg Kroah-Hartman
2016-12-13 17:16 ` Greg Kroah-Hartman [this message]
2016-12-13 17:16 ` [PATCH 4.8 12/33] scsi: lpfc: fix oops/BUG in lpfc_sli_ringtxcmpl_put() Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 13/33] sched/autogroup: Fix 64-bit kernel nice level adjustment Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 14/33] vhost-vsock: fix orphan connection reset Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 15/33] perf/x86: Fix full width counter, counter overflow Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 16/33] acpi, nfit: fix extended status translations for ACPI DSMs Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 17/33] acpi, nfit, libnvdimm: fix / harden ars_status output length handling Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 18/33] acpi, nfit: validate ars_status output buffer size Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 19/33] acpi, nfit: fix bus vs dimm confusion in xlat_status Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 20/33] crypto: marvell - Dont copy hash operation twice into the SRAM Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 22/33] crypto: mcryptd - Check mcryptd algorithm compatibility Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 23/33] crypto: marvell - Dont corrupt state of an STD req for re-stepped ahash Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 24/33] can: raw: raw_setsockopt: limit number of can_filter that can be set Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 26/33] Revert "ACPI: Execute _PTS before system reboot" Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 27/33] ARM: dts: orion5x: fix number of sata port for linkstation ls-gl Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 28/33] ARM: dts: imx7d: fix LCDIF clock assignment Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 29/33] ceph: dont set req->r_locked_dir in ceph_d_revalidate Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 30/33] m68k: Fix ndelay() macro Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 31/33] batman-adv: Check for alloc errors when preparing TT local data Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 32/33] hotplug: Make register and unregister notifier API symmetric Greg Kroah-Hartman
2016-12-13 17:16 ` [PATCH 4.8 33/33] crypto: rsa - Add Makefile dependencies to fix parallel builds Greg Kroah-Hartman
2016-12-13 19:32 ` [PATCH 4.8 00/33] 4.8.15-stable review Shuah Khan
2016-12-13 20:07 ` Greg Kroah-Hartman
2016-12-14 4:13 ` Guenter Roeck
2016-12-14 12:49 ` Greg Kroah-Hartman
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