** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1396907
Title:
Unconditionally exchanging short filenames breaks userspace
/proc/$$/exe links
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Utopic:
Confirmed
Bug description:
SRU Justification:
Impact: Since v3.15 the link of /proc/<pid>/exe will unconditionally
be renamed to the previous name of a binary when the filename is short
and the binary was running. For example foo is a daemon and running
while dpkg installs a new version. dpkg will unpack as foo.dpkg-new
first and then rename to foo. After that /proc/<pid>/exe of the
running foo daemon will point to the (no non-existent) foo.dpkg-new.
Which in turn causes start-stop-daemon if that is used post-install to
fail finding the running instance.
Fix: Backport of the following upstream change (which came with v3.17):
From d2fa4a8476b911782f7e5167db18770222ac40c3 Mon Sep 17 00:00:00 2001
From: Mikhail Efremov <s...@altlinux.org>
Date: Wed, 24 Sep 2014 22:14:33 +0400
Subject: [PATCH] vfs: Don't exchange "short" filenames unconditionally.
Only exchange source and destination filenames
if flags contain RENAME_EXCHANGE.
In case if executable file was running and replaced by
other file /proc/PID/exe should still show correct file name,
not the old name of the file by which it was replaced.
Testcase: Any binary running that has a short (<= DNAME_INLINE_LEN)
filename), copy the current binary to <oldname>.new and then move
<oldname>.new to <oldname>. Now /proc/<pid>/exe of the running process
points to <oldname>.new wihtout the change but remains to be <oldname>
with the patch.
break-fix: da1ce0670c14d8380e423a3239e562a1dc15fa9e
d2fa4a8476b911782f7e5167db18770222ac40c3
break-fix: da1ce0670c14d8380e423a3239e562a1dc15fa9e
a28ddb87cdddb0db57466ba7f59f831002f4340c
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