← Feed

Posts

• View post

  So recvmsg(2) says that if you receive a Unix socket message and its ancillary data does not fit in the buffer, it still returns success but sets MSG_CTRUNC in the output flags. A bit error-prone, but OK. What it doesn't tell you is that if you receive file descriptors in the ancillary data (SCM_RIGHTS) and the Linux security subsystem decides that you don't have access to those file descriptors, it just removes them from the list and sets MSG_CTRUNC. Took a long time to figure out...

• View post

  Oh no he did it again https://tom7.org/httpv/httpv.pdf (I checked with Wireshark and it works as advertised, when you load the site every byte sent by the server is visible in cleartext in the TLS stream)

• View post

  Encountered an interesting way to generate a temporary file name today: take the original file name, and increment the last character's byte https://github.com/servo/nss/blob/3d07e85/lib/util/utilmod.c#L467

• View post

  Just a random thought for no particular reason, if you work at Nvidia you might be a bit biased about so-called AI so maybe don’t try to sell LLMs as being great for open source software?

• View post

  Writing this so I can remember it later: If you try to run sudo in a chroot/systemd-nspawn rootfs of a foreign architecture (via binfmt) and get sudo: effective uid is not 0, is /usr/bin/sudo on a file system with the 'nosuid' option set or an NFS file system without root privileges? it’s because binfmt doesn’t honor the setuid bit by default. Copy /usr/lib/binfmt.d/qemu-<arch>.conf to /etc/binfmt.d/, edit the copy, add a C at the end and restart systemd-binfmt.service.

• View post

  Good job

• View post

  RE: https://corteximplant.com/@codinginquarantine/116460826954446199 I’ve seen this a few times and that made me wonder… Was analog “snow” black and white or color? I’m pretty sure it was B&W, but maybe it depends on the TV standard (I’ve only seen SECAM TVs back in the day…)

• View post

  TIL that in C++ you can specify a default parameter value in a function/method declaration even if you omit the parameter name. This is valid: void f(int = 3); (The code I was reading was something like void f(..., timestamp = 0) and it took me a while to realize that timestamp was a custom type and not a parameter name…)

• View post

  Me: return some_list[start:end] Python formatting tool #1: Hey you need spaces around colons, I changed the line to "return some_list[start : end]" Python formatting tool #2: Error! whitespace before ':' Me: ... Me: return some_list[slice(start, end)] Thanks, formatting tools...