linux-kernel - [PATCH][next] dm ioctl: rate limit a couple of ioctl based error messages

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Message-Id: <20241024110431.1906858-1-colin.i.king@gmail.com>
Date: Thu, 24 Oct 2024 12:04:31 +0100
From: Colin Ian King <colin.i.king@...il.com>
To: Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>,
	dm-devel@...ts.linux.dev
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH][next] dm ioctl: rate limit a couple of ioctl based error messages

It is possible to spam the kernel log with a misbehaving user process that
is passing incorrect dm ioctls to /dev/mapper/control. Use a rate limit
on these error messages to reduce the noise.

Signed-off-by: Colin Ian King <colin.i.king@...il.com>
---
 drivers/md/dm-ioctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index f299ff393a6a..d42eac944eb5 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1912,7 +1912,7 @@ static int check_version(unsigned int cmd, struct dm_ioctl __user *user,
 
 	if ((kernel_params->version[0] != DM_VERSION_MAJOR) ||
 	    (kernel_params->version[1] > DM_VERSION_MINOR)) {
-		DMERR("ioctl interface mismatch: kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)",
+		DMERR_LIMIT("ioctl interface mismatch: kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)",
 		      DM_VERSION_MAJOR, DM_VERSION_MINOR,
 		      DM_VERSION_PATCHLEVEL,
 		      kernel_params->version[0],
@@ -1961,7 +1961,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
 
 	if (unlikely(param_kernel->data_size < minimum_data_size) ||
 	    unlikely(param_kernel->data_size > DM_MAX_TARGETS * DM_MAX_TARGET_PARAMS)) {
-		DMERR("Invalid data size in the ioctl structure: %u",
+		DMERR_LIMIT("Invalid data size in the ioctl structure: %u",
 		      param_kernel->data_size);
 		return -EINVAL;
 	}
-- 
2.39.5