On Wed, 6 Oct 2021 19:46:57 -0700 Suren Baghdasaryan [off-list ref] wrote:

quoted

quoted

quoted

quoted

I wish it was that simple and for some names like [anon:.bss] or
[anon:dalvik-zygote space] reserving a unique id would work, however
some names like [anon:dalvik-/system/framework/boot-core-icu4j.art]
are generated dynamically at runtime and include package name.

Valuable information

Yeah, I should have described it clearer the first time around.

If it gets this fancy then the 80 char limit is likely to become a
significant limitation and the choice should be explained & justified.

Why not 97?  1034?  Why not just strndup_user() and be done with it?

The original patch from 8 years ago used 256 as the limit but Rasmus
argued that the string content should be human-readable, so 80 chars
seems to be a reasonable limit (see:
https://lore.kernel.org/all/d8619a98-2380-ca96-001e-60fe9c6204a6@rasmusvillemoes.dk (local)),
which makes sense to me. We should be able to handle the 80 char limit
by trimming it before calling prctl().

What's the downside to making it unlimited?