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Date: Thu, 15 Oct 2020 08:01:00 +0300
From: Alexey Izbyshev <izbyshev@...ras.ru>
To: musl@...ts.openwall.com
Subject: Why is setrlimit() considered to have per-thread effect?
Hello,
Commit 544ee752cd[1] claims that setrlimit() is per-thread on Linux,
similarly to setxid() calls, so it should be called via __synccall().
But this appears to be wrong: the kernel code operates on
tsk->signal[2], which is a per-thread-group structure. Glibc doesn't
call setrlimit() for each thread either. Am I missing something?
Tangentially, setgroups() is not called via __synccall(), though it does
have per-thread effect. Is this intentional?
Alexey
[1]
https://git.musl-libc.org/cgit/musl/commit/?id=544ee752cd38febfa3aa3798b4dfb6fabd13846b
[2] https://elixir.bootlin.com/linux/v5.9/source/kernel/sys.c#L1566
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