@tj@altelectron.org.uk
@tj@altelectron.org.uk avatar

tj

@tj@altelectron.org.uk

co-host of bsdnow.tv
Militant Internet Engineer, (network|kernel)hacker, adventurist.
#freebsd #wifi MM6IRQ

Consular Officer in the scottishconsulate.org
Cyberpunk and op in #n-o-d-e on libera. Come say hello

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azonenberg, to random
@azonenberg@ioc.exchange avatar

How crazy/horrible/stupid would it be to write a single-pass streaming parser for ELF as part of a firmware updater?

More specifically, you're given a chance to look at each byte of data once. You can either write it to flash immediately, update some local variables (like "offset of .text"), or ignore it.

But once you've seen a given part of the file, you can't rewind and look at it again later (since I'm flashing an image that might be larger than available RAM).

How likely is this to fail in practice? I'm not asking if one of the POC||GTFO editors could craft an ELF that would break this, I'm sure they could. But if I control the linker script generating the file, and have the parser simply refuse to process any file that doesn't play by my rules, am I probably OK?

tj,
@tj@altelectron.org.uk avatar

@azonenberg Does SFTP guarantee that file transfers are correct? TCP only promises that segments are delivered to the receiving application has to ensure they are delivered and processed correctly. Sadly all the layers below will just save corruption in those layers and could easily miss a crash between a valid segment and the data making it to where it needs to go

tj, to random
@tj@altelectron.org.uk avatar

Now I have a 8 second build/test kernel debug cycle having to do a 3 minute clean build is really jarring

tj,
@tj@altelectron.org.uk avatar

@red it is an incremental build, but the 200 second clean build time isn't too bad.

I cannot understand the 40 minute to 3 hour linux kernel builds

tj, to FreeBSD
@tj@altelectron.org.uk avatar

Can someone explain this reference to me?

tj, to random
@tj@altelectron.org.uk avatar

Got an absolute deal on some small computers.

Not sure I’d recommend them, but I have read their entire datasheet while adding support for the intel soc in the gpd pocket

Lazarou, to UKpolitics
@Lazarou@mastodon.social avatar

Can we ban that cokehead from public life? Surely he's done enough damage to the nation already, time to retire the Pob-faced twat

tj,
@tj@altelectron.org.uk avatar

@Lazarou @cstross I’ve no idea how such a Tory could come from the primary school I went to. Must be a prior idiot

tj, to random
@tj@altelectron.org.uk avatar

Coffee with the birds

A balmy -5

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