Debdif to disable pie for bash builds ** Patch added: "bash_4.3-14ubuntu2.debdiff" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1518483/+attachment/4596747/+files/bash_4.3-14ubuntu2.debdiff
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1518483 Title: problem with PIE binaries and kernels <= 3.19 Status in bash package in Ubuntu: New Status in linux package in Ubuntu: Fix Released Status in bash source package in Vivid: Invalid Status in linux source package in Vivid: Fix Released Bug description: When bash is built as a Position Independent Executable (PIE), it very sporadically crashes due to some issue with memory layout in kernels before 4.2. I'm currently testing enabling PIE by default in gcc on amd64 for xenial, and some of my builds (e.g. cpio) are failing in the buildds with the following message emitted: bash: xmalloc: .././locale.c:81: cannot allocate 2 bytes (0 bytes allocated) when the bash that is used is built as PIE. I have seen these failures on buildds where the host is running 3.13 and 3.19. I am also able to reproduce this locally on a machine running trusty with the stock trusty kernel. However, when I boot that same machine with the linux- lts-wily (4.2) kernel and retry the build with everything else exactly the same, the failure disappears. I discussed this a bit with Kees Cook, and he noted that some cleanups to the kernel's ASLR code happened in 4.1. Specifically, he noted: commit a87938b2e246b81b4fb713edb371a9fa3c5c3c86 Author: Michael Davidson <m...@google.com> fs/binfmt_elf.c: fix bug in loading of PIE binaries However, that landed in stable and has been picked up in our kernels as 668965be56ea0b2c45ed6bec84dc2088490ae6b1, landing in Ubuntu-3.13.0-56.93 and b51621abbcb4694b8d2842ce3a66006a60bba6e5 / Ubuntu-3.19.0-19.19. Kees also pointed out that he landed a series of patches from 204db6ed17743000691d930368a5abd6ea541c58 until Michael Davidson's patch (i.e. a87938b2e246b81b4fb713edb371a9fa3c5c3c86..204db6ed17743000691d930368a5abd6ea541c58 ), and in particular, there's: commit d1fd836dcf00d2028c700c7e44d2c23404062c90 Author: Kees Cook <keesc...@chromium.org> mm: split ET_DYN ASLR from mmap ASLR Other fixes that I see to fs/binfmt_elf.c and arch/x86/mm/mmap.c look like they either occurred only in 4.3 or have already been backported via the stable kernels. I should also point out that these cleanups may address some of the ASLR failed tests that occur on non-x86 architectures for pre 4.2 kernels. I am happy to test out kernels to try to address this. Thanks. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-68-generic 3.13.0-68.111 ProcVersionSignature: Ubuntu 3.13.0-68.111-generic 3.13.11-ckt27 Uname: Linux 3.13.0-68-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.18 Architecture: amd64 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/hwC0D1', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1c', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Fri Nov 20 13:58:40 2015 HibernationDevice: RESUME=UUID=dc63f523-507a-4f9d-aa30-a2e880199150 IwConfig: eth0 no wireless extensions. lo no wireless extensions. MachineType: Shuttle Inc SG33 ProcEnviron: SHELL=/bin/bash TERM=screen PATH=(custom, user) LANG=en_US.UTF-8 XDG_RUNTIME_DIR=<set> ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-68-generic root=UUID=d30e91cf-3c43-41a9-a72d-c07d1be1d53e ro loop.max_loop=64 rootflags=data=ordered nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw RelatedPackageVersions: linux-restricted-modules-3.13.0-68-generic N/A linux-backports-modules-3.13.0-68-generic N/A linux-firmware 1.127.18 RfKill: SourcePackage: linux StagingDrivers: zram UpgradeStatus: Upgraded to trusty on 2014-04-16 (583 days ago) WpaSupplicantLog: dmi.bios.date: 11/28/2007 dmi.bios.vendor: Phoenix Technologies, LTD dmi.bios.version: 6.00 PG dmi.board.name: FG33 dmi.board.vendor: Shuttle Inc dmi.board.version: V10 dmi.chassis.type: 3 dmi.chassis.vendor: Shuttle Inc dmi.chassis.version: G5 dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd11/28/2007:svnShuttleInc:pnSG33:pvrV10:rvnShuttleInc:rnFG33:rvrV10:cvnShuttleInc:ct3:cvrG5: dmi.product.name: SG33 dmi.product.version: V10 dmi.sys.vendor: Shuttle Inc To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bash/+bug/1518483/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
