From: Alexey Izbyshev <izbyshev@ispras.ru>
To: musl@lists.openwall.com
Cc: Bruno Haible <bruno@clisp.org>
Subject: Re: [musl] insufficient checking in posix_spawn_file_actions_add{open,dup2}
Date: Mon, 25 Jan 2021 22:33:15 +0300 [thread overview]
Message-ID: <2af5be3e5cda425b3f65a2b9485c7f0a@ispras.ru> (raw)
In-Reply-To: <20210125161512.GW23432@brightrain.aerifal.cx>
On 2021-01-25 19:15, Rich Felker wrote:
> On Mon, Jan 25, 2021 at 05:07:36PM +0100, Bruno Haible wrote:
>> Do you know why even simple syscalls like getpid()
>> exist in the vdso only for ia64?
>
> In the case of getpid, because glibc does (or at least did? not sure
> if they still do) cache it themselves in the TCB, adding it to vdso
> offered no additional concrete benefit.
>
Glibc dropped PID caching long ago[1], and it famously regressed systemd
at the time[2].
[1]
https://sourceware.org/git/?p=glibc.git;a=commit;h=c579f48edba88380635ab98cb612030e3ed8691e
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1469670
Alexey
next prev parent reply other threads:[~2021-01-25 19:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-25 8:31 Bruno Haible
2021-01-25 8:40 ` [musl] insufficient checking in posix_spawn_file_actions_addclose Bruno Haible
2021-01-25 14:42 ` [musl] insufficient checking in posix_spawn_file_actions_add{open,dup2} Rich Felker
2021-01-25 16:07 ` Bruno Haible
2021-01-25 16:15 ` Rich Felker
2021-01-25 17:58 ` Bruno Haible
2021-01-25 19:33 ` Alexey Izbyshev [this message]
2021-01-25 19:37 ` Markus Wichmann
2021-01-25 19:48 ` Florian Weimer
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