linux-kernel - [PATCH 4.14 109/217] dev-dax: check_vma: ratelimit dev

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Message-Id: <20180823075510.388884386@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:53:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jeff Moyer <jmoyer@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 109/217] dev-dax: check_vma: ratelimit dev_info-s

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jeff Moyer <jmoyer@...hat.com>

[ Upstream commit 5a14e91d559aee5bdb0e002e1153fd9c4338a29e ]

This is easily triggered from userspace, so let's ratelimit the
messages.

Signed-off-by: Jeff Moyer <jmoyer@...hat.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/dax/device.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -188,14 +188,16 @@ static int check_vma(struct dev_dax *dev
 
 	/* prevent private mappings from being established */
 	if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {
-		dev_info(dev, "%s: %s: fail, attempted private mapping\n",
+		dev_info_ratelimited(dev,
+				"%s: %s: fail, attempted private mapping\n",
 				current->comm, func);
 		return -EINVAL;
 	}
 
 	mask = dax_region->align - 1;
 	if (vma->vm_start & mask || vma->vm_end & mask) {
-		dev_info(dev, "%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",
+		dev_info_ratelimited(dev,
+				"%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",
 				current->comm, func, vma->vm_start, vma->vm_end,
 				mask);
 		return -EINVAL;
@@ -203,13 +205,15 @@ static int check_vma(struct dev_dax *dev
 
 	if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV
 			&& (vma->vm_flags & VM_DONTCOPY) == 0) {
-		dev_info(dev, "%s: %s: fail, dax range requires MADV_DONTFORK\n",
+		dev_info_ratelimited(dev,
+				"%s: %s: fail, dax range requires MADV_DONTFORK\n",
 				current->comm, func);
 		return -EINVAL;
 	}
 
 	if (!vma_is_dax(vma)) {
-		dev_info(dev, "%s: %s: fail, vma is not DAX capable\n",
+		dev_info_ratelimited(dev,
+				"%s: %s: fail, vma is not DAX capable\n",
 				current->comm, func);
 		return -EINVAL;
 	}