This bug was fixed in the package procps - 1:3.3.9-1ubuntu5.1 --------------- procps (1:3.3.9-1ubuntu5.1) utopic; urgency=medium
* Copy 10-zeropage.conf.armhf to 10-zeropage.conf.arm64 (LP: #1415481) -- Adam Conrad <[email protected]> Wed, 28 Jan 2015 10:17:09 -0700 ** Changed in: procps (Ubuntu Utopic) Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to procps in Ubuntu. https://bugs.launchpad.net/bugs/1415481 Title: default mmap_min_addr for arm64 prevents running arm32 applications Status in procps package in Ubuntu: Fix Released Status in procps source package in Trusty: Fix Released Status in procps source package in Utopic: Fix Released Bug description: [ SRU Justification ] Executing 32-bit arm binaries as user fails on arm64. Turns out, this is bad. [ Test Case ] Grab a 32-bit binary (either multiarch via armhf, or compile a quick static hello) and try to run it. Also, check /proc/sys/vm/mmap_min_addr is set to 32k instead of 64k after boot. [ Regression Potential ] Shouldn't be any issue with 4k pagesize kernels, and this was already the default on 32-bit ARM for the same reasons. It could, potentially, mean that the zero page is no longer entirely protected from mmap when running a 64k pagesize kernel, however we don't currently ship such a kernel, preferring instead to have 32-bit compatibility. [ Original Bug Report ] Executing 32-bit arm binaries as user fails on arm64: # file hello hello: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, for GNU/Linux 2.6.32, BuildID[sha1]=c37a3b366d645eee600963a535370fa0bad9b2c0, not stripped # ./hello hello world # su - linaro $ /root/hello Segmentation fault Root cause was identified to /etc/sysctl.d/10-zeropage.conf, which is set on arm64 to 65536. To run legacy binaries, this should be set to 32768 like on armhf anr armel. Reference discussion: http://lists.infradead.org/pipermail/linux-arm- kernel/2015-January/320454.html Affects trusty, utopic and vivid To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/procps/+bug/1415481/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
