Patch "scripts: recordmcount: break hardlinks" has been added to the 3.18-stable tree

Patch "scripts: recordmcount: break hardlinks" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    scripts: recordmcount: break hardlinks

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     scripts-recordmcount-break-hardlinks.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From dd39a26538e37f6c6131e829a4a510787e43c783 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Fri, 11 Dec 2015 12:09:03 +0000
Subject: scripts: recordmcount: break hardlinks

From: Russell King <rmk+kernel@arm.linux.org.uk>

commit dd39a26538e37f6c6131e829a4a510787e43c783 upstream.

recordmcount edits the file in-place, which can cause problems when
using ccache in hardlink mode.  Arrange for recordmcount to break a
hardlinked object.

Link: http://lkml.kernel.org/r/E1a7MVT-0000et-62@rmk-PC.arm.linux.org.uk

Cc: stable@vger.kernel.org # 2.6.37+
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 scripts/recordmcount.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -201,6 +201,20 @@ static void *mmap_file(char const *fname
 		addr = umalloc(sb.st_size);
 		uread(fd_map, addr, sb.st_size);
 	}
+	if (sb.st_nlink != 1) {
+		/* file is hard-linked, break the hard link */
+		close(fd_map);
+		if (unlink(fname) < 0) {
+			perror(fname);
+			fail_file();
+		}
+		fd_map = open(fname, O_RDWR | O_CREAT, sb.st_mode);
+		if (fd_map < 0) {
+			perror(fname);
+			fail_file();
+		}
+		uwrite(fd_map, addr, sb.st_size);
+	}
 	return addr;
 }
 


Patches currently in stable-queue which might be from rmk+kernel@arm.linux.org.uk are

queue-3.18/scripts-recordmcount-break-hardlinks.patch