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Message #77284
[Bug 1031718] Re: Obscure error messages caused by ubuntu patch
So. Apparently this has been "fixed" somewhere along the road to Ubuntu
14.04.
The patch is commented out in the debian/patches/series file in version 1.3.0-0ubuntu2.
However, the debian/changelog doesn't tell me when that happened (or when it was added, for that matter).
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https://bugs.launchpad.net/bugs/1031718
Title:
Obscure error messages caused by ubuntu patch
Status in “libjpeg-turbo” package in Ubuntu:
Confirmed
Bug description:
Environment:
Description: Ubuntu 12.04 LTS
Release: 12.04
libjpeg-turbo8 1.1.90+svn733-0ubuntu4.1
Ubuntu's own patch (FixLibraryStartup.patch) causes obscure "Error
opening file for reading: Permission denied" error messages.
The patch adds some auxv related stuff to the library init that
attempt to read /proc/self/auxv. If it fails the above error is
printed usually ending up to application's log that's using the
library. Looking at the log it's completely unclear where that error
came from and what file was it trying to read.
The /proc/self/auxv has 0400 permissions and is owned by the user who
started the process. If the process drops privileges and setuid()'s to
another user, the file is no longer readable.
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