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From: Alexey Izbyshev <izbyshev@ispras.ru>
To: musl@lists.openwall.com
Subject: [musl] Why is setrlimit() considered to have per-thread effect?
Date: Thu, 15 Oct 2020 08:01:00 +0300	[thread overview]
Message-ID: <948f6fc6f3458f18152c0f8b505beec0@ispras.ru> (raw)

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

             reply	other threads:[~2020-10-15  5:01 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-15  5:01 Alexey Izbyshev [this message]
2020-10-15  8:50 ` Szabolcs Nagy
2020-10-15 15:49   ` Rich Felker
2020-10-15 16:13     ` Alexey Izbyshev
2020-10-15 17:13       ` Rich Felker
2020-10-15 18:26         ` Alexey Izbyshev
2020-10-15 20:03           ` Rich Felker
2020-10-15 15:50   ` Alexey Izbyshev
2020-10-15 20:05     ` Rich Felker
2020-10-15 15:43 ` Rich Felker

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