** Information type changed from Private Security to Public Security -- 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/2027846
Title: tmpfs: Deleted files keep reappearing Status in linux package in Ubuntu: New Bug description: I am trying to do a number of compilations, including bisects, etc. As part of the process I delete all the files from a compilation so that everything is nice and clean. However, some of these files keep reappearing! In this case I am bisecting Wine. To help I added an ltrace to the Wine shell script... I am compiling to /tmp/wine. /tmp is a tmpfs mount. I added ltrace to /tmp/wine/wine64/wine, which is a shell script. The last line of that script being: exec ltrace "$WINELOADER" "$@" I have then deleted everything in this directory (multiple times). When attempting to access /tmp/wine/wine64/wine I am told that the file does not exist, as expected. I then run a compilation. On checking /tmp/wine/wine64/wine it contains the ltrace: exec ltrace "$WINELOADER" "$@" I thought it might just be bash, but I checked with Pluma and this file contains ltrace – data I have deleted multiple times and should have been overwritten. I tried multiple "sync"s and dropping the caches, but it makes no difference. Why does this data keep reappearing? Why can't I delete a file? What kind of madness is this? There are no words for just how bad this is. In particular: this is definitely a security issue. If a user deletes a file, all I have to do is recreate a file with the same name and I have access to all that user's data. I've spent hours bisecting, but it turns out I cannot trust any of the results as I have no guarantee that any of the files have actually changed. I haven't checked the upstream kernel yet, but I am aware that this is required. It could take many hours. ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-5.15.0-76-generic 5.15.0-76.83 ProcVersionSignature: Ubuntu 5.15.0-76.83-generic 5.15.99 Uname: Linux 5.15.0-76-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu82.5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ken 8889 F.... pulseaudio /dev/snd/controlC1: ken 8889 F.... pulseaudio /dev/snd/pcmC1D7p: ken 8889 F...m pulseaudio CasperMD5CheckResult: unknown CurrentDesktop: MATE Date: Sat Jul 15 06:32:07 2023 MachineType: LENOVO 0606AD5 ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-5.15.0-76-generic root=UUID=bc8de7a2-4160-4017-937e-3d4126551687 ro rootflags=subvol=@ root=/dev/sdb10 quiet splash zswap.enabled=1 zswap.compressor=lz4 zswap.max_pool_percent=50 zswap.zpool=z3fold module_blacklist=mei_me hugepagesz=1G hugepages=3 hugepagesz=2M hugepages=100 vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.15.0-76-generic N/A linux-backports-modules-5.15.0-76-generic N/A linux-firmware 20220329.git681281e4-0ubuntu3.14 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to jammy on 2022-09-26 (291 days ago) dmi.bios.date: 12/15/2016 dmi.bios.release: 0.60 dmi.bios.vendor: LENOVO dmi.bios.version: A0KT60AUS dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: LENOVO dmi.board.vendor: LENOVO dmi.board.version: NONE dmi.chassis.type: 7 dmi.chassis.vendor: LENOVO dmi.chassis.version: NONE dmi.modalias: dmi:bvnLENOVO:bvrA0KT60AUS:bd12/15/2016:br0.60:svnLENOVO:pn0606AD5:pvrThinkStationS30:rvnLENOVO:rnLENOVO:rvrNONE:cvnLENOVO:ct7:cvrNONE:skuLENOVO_BI_A0: dmi.product.family: To be filled by O.E.M. dmi.product.name: 0606AD5 dmi.product.sku: LENOVO_BI_A0 dmi.product.version: ThinkStation S30 dmi.sys.vendor: LENOVO modified.conffile..etc.apport.crashdb.conf: [modified] mtime.conffile..etc.apport.crashdb.conf: 2019-08-06T11:56:22.315382 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2027846/+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
