From: ira.weiny@intel.com To: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org> Cc: x86@kernel.org, Dave Hansen <dave.hansen@linux.intel.com>, Andrew Morton <akpm@linux-foundation.org>, Fenghua Yu <fenghua.yu@intel.com>, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: [RFC PATCH 10/15] drivers/dax: Expand lock scope to cover the use of addresses Date: Tue, 14 Jul 2020 00:02:15 -0700 [thread overview] Message-ID: <20200714070220.3500839-11-ira.weiny@intel.com> (raw) In-Reply-To: <20200714070220.3500839-1-ira.weiny@intel.com> From: Ira Weiny <ira.weiny@intel.com> The addition of PKS protection to dax read lock/unlock will require that the address returned by dax_direct_access() be protected by this lock. While not technically necessary for this series, this corrects the locking by ensuring that the use of kaddr and end_kaddr are covered by the dax read lock/unlock. Change the lock scope to cover the kaddr and end_kaddr use. Reviewed-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> --- drivers/dax/super.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 8e32345be0f7..021739768093 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -103,11 +103,11 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev, id = dax_read_lock(); len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn); len2 = dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn); - dax_read_unlock(id); if (len < 1 || len2 < 1) { pr_debug("%s: error: dax access failed (%ld)\n", bdevname(bdev, buf), len < 1 ? len : len2); + dax_read_unlock(id); return false; } @@ -137,6 +137,7 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev, put_dev_pagemap(end_pgmap); } + dax_read_unlock(id); if (!dax_enabled) { pr_debug("%s: error: dax support not enabled\n", -- 2.25.1 _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org
WARNING: multiple messages have this Message-ID (diff)
From: ira.weiny@intel.com To: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org> Cc: Ira Weiny <ira.weiny@intel.com>, Dan Williams <dan.j.williams@intel.com>, x86@kernel.org, Dave Hansen <dave.hansen@linux.intel.com>, Vishal Verma <vishal.l.verma@intel.com>, Andrew Morton <akpm@linux-foundation.org>, Fenghua Yu <fenghua.yu@intel.com>, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: [RFC PATCH 10/15] drivers/dax: Expand lock scope to cover the use of addresses Date: Tue, 14 Jul 2020 00:02:15 -0700 [thread overview] Message-ID: <20200714070220.3500839-11-ira.weiny@intel.com> (raw) In-Reply-To: <20200714070220.3500839-1-ira.weiny@intel.com> From: Ira Weiny <ira.weiny@intel.com> The addition of PKS protection to dax read lock/unlock will require that the address returned by dax_direct_access() be protected by this lock. While not technically necessary for this series, this corrects the locking by ensuring that the use of kaddr and end_kaddr are covered by the dax read lock/unlock. Change the lock scope to cover the kaddr and end_kaddr use. Reviewed-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> --- drivers/dax/super.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 8e32345be0f7..021739768093 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -103,11 +103,11 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev, id = dax_read_lock(); len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn); len2 = dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn); - dax_read_unlock(id); if (len < 1 || len2 < 1) { pr_debug("%s: error: dax access failed (%ld)\n", bdevname(bdev, buf), len < 1 ? len : len2); + dax_read_unlock(id); return false; } @@ -137,6 +137,7 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev, put_dev_pagemap(end_pgmap); } + dax_read_unlock(id); if (!dax_enabled) { pr_debug("%s: error: dax support not enabled\n", -- 2.25.1
next prev parent reply other threads:[~2020-07-14 7:04 UTC|newest] Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-14 7:02 [RFC PATCH 00/15] PKS: Add Protection Keys Supervisor (PKS) support ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 01/15] x86/pkeys: Create pkeys_internal.h ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 02/15] x86/fpu: Refactor arch_set_user_pkey_access() for PKS support ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 03/15] x86/pks: Enable Protection Keys Supervisor (PKS) ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 04/15] x86/pks: Preserve the PKRS MSR on context switch ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 8:27 ` Peter Zijlstra 2020-07-14 8:27 ` Peter Zijlstra 2020-07-14 18:53 ` Ira Weiny 2020-07-14 18:53 ` Ira Weiny 2020-07-14 18:56 ` Dave Hansen 2020-07-14 18:56 ` Dave Hansen 2020-07-14 19:05 ` Peter Zijlstra 2020-07-14 19:05 ` Peter Zijlstra 2020-07-14 19:09 ` Ira Weiny 2020-07-14 19:09 ` Ira Weiny 2020-07-16 8:37 ` [x86/pks] 061e3e0b92: leaking-addresses.dmesg.uncheckedMSRaccesserror:WRMSRto0x6e1(triedtowrite0x0000000055555554)atrIP:(write_pkrs+0x15/0x2b) kernel test robot 2020-07-16 8:37 ` kernel test robot 2020-07-14 7:02 ` [RFC PATCH 05/15] x86/pks: Add PKS kernel API ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 06/15] x86/pks: Add a debugfs file for allocated PKS keys ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 07/15] Documentation/pkeys: Update documentation for kernel pkeys ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 08/15] x86/pks: Add PKS Test code ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 09/15] fs/dax: Remove unused size parameter ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` ira.weiny [this message] 2020-07-14 7:02 ` [RFC PATCH 10/15] drivers/dax: Expand lock scope to cover the use of addresses ira.weiny 2020-07-14 7:02 ` [RFC PATCH 11/15] memremap: Add zone device access protection ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 8:40 ` Peter Zijlstra 2020-07-14 8:40 ` Peter Zijlstra 2020-07-14 19:10 ` Ira Weiny 2020-07-14 19:10 ` Ira Weiny 2020-07-14 19:40 ` Peter Zijlstra 2020-07-14 19:40 ` Peter Zijlstra 2020-07-14 7:02 ` [RFC PATCH 12/15] kmap: Add stray write protection for device pages ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 8:44 ` Peter Zijlstra 2020-07-14 8:44 ` Peter Zijlstra 2020-07-14 19:06 ` Ira Weiny 2020-07-14 19:06 ` Ira Weiny 2020-07-14 19:29 ` Peter Zijlstra 2020-07-14 19:29 ` Peter Zijlstra 2020-07-14 19:42 ` Dave Hansen 2020-07-14 19:42 ` Dave Hansen 2020-07-14 19:49 ` Peter Zijlstra 2020-07-14 19:49 ` Peter Zijlstra 2020-07-14 20:00 ` Ira Weiny 2020-07-14 20:00 ` Ira Weiny 2020-07-14 7:02 ` [RFC PATCH 13/15] dax: Stray write protection for dax_direct_access() ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 14/15] nvdimm/pmem: Stray write protection for pmem->virt_addr ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 15/15] [dax|pmem]: Enable stray write protection ira.weiny 2020-07-14 7:02 ` ira.weiny
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20200714070220.3500839-11-ira.weiny@intel.com \ --to=ira.weiny@intel.com \ --cc=akpm@linux-foundation.org \ --cc=bp@alien8.de \ --cc=dave.hansen@linux.intel.com \ --cc=fenghua.yu@intel.com \ --cc=linux-doc@vger.kernel.org \ --cc=linux-fsdevel@vger.kernel.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-kselftest@vger.kernel.org \ --cc=linux-mm@kvack.org \ --cc=linux-nvdimm@lists.01.org \ --cc=luto@kernel.org \ --cc=mingo@redhat.com \ --cc=peterz@infradead.org \ --cc=tglx@linutronix.de \ --cc=x86@kernel.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.