From 0ccf8f1cbcec01271334ec78208f0b7a17f263bd Mon Sep 17 00:00:00 2001 From: gennyble Date: Sun, 14 Apr 2024 02:41:40 -0500 Subject: Make a things page for memoryleak my beloved --- served/things/memoryleak/memoryleak.html | 117 +++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 served/things/memoryleak/memoryleak.html (limited to 'served/things/memoryleak/memoryleak.html') diff --git a/served/things/memoryleak/memoryleak.html b/served/things/memoryleak/memoryleak.html new file mode 100644 index 0000000..bacbe5e --- /dev/null +++ b/served/things/memoryleak/memoryleak.html @@ -0,0 +1,117 @@ +--- +template=post +title=Memoryleak was +style=/styles/post.css +style=memoryleak.css +--- + +A virtual machine slowly decaying. Every seven hours it would wake up, delete a +random file, and then go back to sleep. It posted about it at +amble.quest/memoryleak + +a screenshot of memoryleak's profile on amble.quest + +[@paragraphs off] +
+ a DDR2 module broken in half at it's notch. you can see the fibre of the PCB. on the side facing the camera there is a memory chip split in half and peaking open. + +

+ It's face is a RAM module that I broke in half. I processed the raw photo + through my perpetually-in-process image processing project. + I am very happy with how it came out! The split-and-just-peaking-open + memory chip is my favourite bit of it.

+
+ +

The virtual machine was an Alpine + Linux + virtual image with curl installed. It was configured to run a script called + pull on boot through the pull_service OpenRC script +

+ +
+
+

downloads

+

logs

+ +

scripts

+ +

images

+ +
+ +

+ pull would get a list of every file on the system and pick one at + random to delete. It'd then post that message to amble.quest through a relay I + made (but was realistically not needed) and actually delete that file. Then + it would turn itself off. +

+ +

+ memoryleak was started from an Arch Linux host with a systemd service, memoryleak.service that + launched qemu (through memoryleak.sh) +

+ +

+ It was really nice watching it run! The 7 hour spacing worked a treat. It was often + enough that I wasn't annoyed at it's slowness and it wasn't a factor of 24 which had + it drifting around the day. +

+

+ Every file on the system had an even shot at getting deleted, even the ephemeral ones! The + rare occasion it hit a persist file was very exciting. In the end it was the musl + at the heart of it that finally gave up. +

+

+ A total of 625 files were deleted. 354 of them were from /sys, 240 were from /proc, and + 31 were persistent files. I've filtered the logs (from the did file) + and picked out the persistent paths. They're in persistent as well as + in the little box below. +

+ 
+ 23: /lib/modules/5.15.94-0-virt/kernel/net/netfilter/xt_connlabel.ko.gz
+ 25: /lib/modules/5.15.94-0-virt/kernel/net/netfilter/ipset/ip_set_bitmap_ip.ko.gz
+ 30: /usr/share/ca-certificates/mozilla/emSign_Root_CA_-_C1.crt
+ 46: /lib/modules/5.15.94-0-virt/kernel/drivers/net/mdio/fwnode_mdio.ko.gz
+ 56: /lib/modules/5.15.94-0-virt/kernel/drivers/video/fbdev/core/fb.ko.gz
+ 63: /lib/dasd-functions.sh
+116: /usr/share/syslinux/cpuid.c32
+137: /usr/share/syslinux/lpxelinux.0
+139: /usr/share/ca-certificates/mozilla/TWCA_Root_Certification_Authority.crt
+161: /lib/apk/db/installed
+198: /usr/share/syslinux/isolinux.bin
+208: /lib/modules/5.15.94-0-virt/kernel/crypto/cryptd.ko.gz
+237: /lib/modules/5.15.94-0-virt/kernel/net/netfilter/ipvs/ip_vs_lblcr.ko.gz
+276: /lib/modules/5.15.94-0-virt/kernel/net/netfilter/nft_quota.ko.gz
+298: /lib/modules/5.15.94-0-virt/kernel/fs/ksmbd/ksmbd.ko.gz
+299: /lib/modules/5.15.94-0-virt/kernel/net/netfilter/xt_physdev.ko.gz
+310: /usr/share/syslinux/syslinux.com
+313: /lib/rc/bin/checkpath
+327: /etc/secfixes.d/alpine
+401: /lib/modules/5.15.94-0-virt/kernel/fs/nls/nls_cp869.ko.gz
+411: /etc/mkinitfs/features.d/ocfs2.modules
+443: /lib/modules/5.15.94-0-virt/kernel/net/netfilter/nf_conncount.ko.gz
+452: /usr/share/ca-certificates/mozilla/TrustCor_ECA-1.crt
+491: /sbin/rc-service
+541: /lib/modules/5.15.94-0-virt/kernel/net/vmw_vsock/vmw_vsock_virtio_transport.ko.gz
+561: /lib/modules/5.15.94-0-virt/kernel/net/netfilter/xt_osf.ko.gz
+580: /lib/rc/bin/service_starting
+589: /lib/modules/5.15.94-0-virt/kernel/net/netfilter/xt_policy.ko.gz
+599: /usr/share/ca-certificates/mozilla/DigiCert_Trusted_Root_G4.crt
+616: /lib/modules/5.15.94-0-virt/kernel/crypto/algif_hash.ko.gz
+625: /lib/ld-musl-x86_64.so.1
+
+
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