linux-kernel - [PATCH] writeback: tracing: prefer strlcpy to strncpy

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Date:   Mon, 28 May 2018 23:37:47 -0700
From:   Nick Desaulniers <nick.desaulniers@...il.com>
To:     rostedt@...dmis.org, mingo@...hat.com
Cc:     Nick Desaulniers <nick.desaulniers@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jens Axboe <axboe@...nel.dk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Shaohua Li <shli@...com>, linux-kernel@...r.kernel.org
Subject: [PATCH] writeback: tracing: prefer strlcpy to strncpy

Fixes a stringop-truncation warning from gcc-8.

Signed-off-by: Nick Desaulniers <nick.desaulniers@...il.com>
---
 include/trace/events/writeback.h | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index 32db72c..cfaf57d 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -66,7 +66,7 @@ TRACE_EVENT(writeback_dirty_page,
 	),
 
 	TP_fast_assign(
-		strncpy(__entry->name,
+		strlcpy(__entry->name,
 			mapping ? dev_name(inode_to_bdi(mapping->host)->dev) : "(unknown)", 32);
 		__entry->ino = mapping ? mapping->host->i_ino : 0;
 		__entry->index = page->index;
@@ -96,7 +96,7 @@ DECLARE_EVENT_CLASS(writeback_dirty_inode_template,
 		struct backing_dev_info *bdi = inode_to_bdi(inode);
 
 		/* may be called for files on pseudo FSes w/ unregistered bdi */
-		strncpy(__entry->name,
+		strlcpy(__entry->name,
 			bdi->dev ? dev_name(bdi->dev) : "(unknown)", 32);
 		__entry->ino		= inode->i_ino;
 		__entry->state		= inode->i_state;
@@ -176,7 +176,7 @@ DECLARE_EVENT_CLASS(writeback_write_inode_template,
 	),
 
 	TP_fast_assign(
-		strncpy(__entry->name,
+		strlcpy(__entry->name,
 			dev_name(inode_to_bdi(inode)->dev), 32);
 		__entry->ino		= inode->i_ino;
 		__entry->sync_mode	= wbc->sync_mode;
@@ -220,7 +220,7 @@ DECLARE_EVENT_CLASS(writeback_work_class,
 		__field(unsigned int, cgroup_ino)
 	),
 	TP_fast_assign(
-		strncpy(__entry->name,
+		strlcpy(__entry->name,
 			wb->bdi->dev ? dev_name(wb->bdi->dev) : "(unknown)", 32);
 		__entry->nr_pages = work->nr_pages;
 		__entry->sb_dev = work->sb ? work->sb->s_dev : 0;
@@ -274,7 +274,7 @@ DECLARE_EVENT_CLASS(writeback_class,
 		__field(unsigned int, cgroup_ino)
 	),
 	TP_fast_assign(
-		strncpy(__entry->name, dev_name(wb->bdi->dev), 32);
+		strlcpy(__entry->name, dev_name(wb->bdi->dev), 32);
 		__entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
 	),
 	TP_printk("bdi %s: cgroup_ino=%u",
@@ -296,7 +296,7 @@ TRACE_EVENT(writeback_bdi_register,
 		__array(char, name, 32)
 	),
 	TP_fast_assign(
-		strncpy(__entry->name, dev_name(bdi->dev), 32);
+		strlcpy(__entry->name, dev_name(bdi->dev), 32);
 	),
 	TP_printk("bdi %s",
 		__entry->name
@@ -321,7 +321,7 @@ DECLARE_EVENT_CLASS(wbc_class,
 	),
 
 	TP_fast_assign(
-		strncpy(__entry->name, dev_name(bdi->dev), 32);
+		strlcpy(__entry->name, dev_name(bdi->dev), 32);
 		__entry->nr_to_write	= wbc->nr_to_write;
 		__entry->pages_skipped	= wbc->pages_skipped;
 		__entry->sync_mode	= wbc->sync_mode;
@@ -372,7 +372,7 @@ TRACE_EVENT(writeback_queue_io,
 	),
 	TP_fast_assign(
 		unsigned long *older_than_this = work->older_than_this;
-		strncpy(__entry->name, dev_name(wb->bdi->dev), 32);
+		strlcpy(__entry->name, dev_name(wb->bdi->dev), 32);
 		__entry->older	= older_than_this ?  *older_than_this : 0;
 		__entry->age	= older_than_this ?
 				  (jiffies - *older_than_this) * 1000 / HZ : -1;
@@ -583,7 +583,7 @@ TRACE_EVENT(writeback_sb_inodes_requeue,
 	),
 
 	TP_fast_assign(
-		strncpy(__entry->name,
+		strlcpy(__entry->name,
 		        dev_name(inode_to_bdi(inode)->dev), 32);
 		__entry->ino		= inode->i_ino;
 		__entry->state		= inode->i_state;
@@ -657,7 +657,7 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
 	),
 
 	TP_fast_assign(
-		strncpy(__entry->name,
+		strlcpy(__entry->name,
 			dev_name(inode_to_bdi(inode)->dev), 32);
 		__entry->ino		= inode->i_ino;
 		__entry->state		= inode->i_state;
-- 
2.7.4