From: Pedro Alves <pedro@palves.net>
To: Tom de Vries <tdevries@suse.de>, gdb-patches@sourceware.org
Subject: Re: [PATCH v2] [gdb/testsuite] Handle ptrace operation not permitted in can_spawn_for_attach
Date: Wed, 24 Apr 2024 20:40:49 +0100 [thread overview]
Message-ID: <cda05bd4-134c-405b-86b3-70a2235488d4@palves.net> (raw)
In-Reply-To: <20240418063237.1545-1-tdevries@suse.de>
On 2024-04-18 07:32, Tom de Vries wrote:
> When running the testsuite on a system with kernel.yama.ptrace_scope set to 1,
> we run into attach failures.
>
> Fix this by recognizing "ptrace: Operation not permitted" in
> can_spawn_for_attach.
>
> Tested on aarch64-linux.
I really don't like relying on "attach" 's behavior to decide whether to test attach.
It's an inversion of responsibilities.
can_spawn_for_attach means "can I spawn a process, such that I will attach to it later", a
simple atomic thing.
Also, with this change, it means, "can I spawn a process and does attaching to it work?"
So it ends up misnamed.
Someone tried to add something very much like this a while ago, and I objected then:
https://inbox.sourceware.org/gdb-patches/e5f08136-fa4d-2f21-ff83-8adf4d3a158e@palves.net/
We ended up with gdb_attach, added in a7e6a19e87f3, which handles the "ptrace: Operation not permitted"
scenarios too. Some testcases have meanwhile been converted to use gdb_attach, but there are more,
of course. IMO we should continue that direction. gdb_attach is not unlike "gdb_run_cmd" for example.
See also:
https://inbox.sourceware.org/gdb-patches/3b845985-cbd4-4996-145e-14191338b095@polymtl.ca/
Pedro Alves
next prev parent reply other threads:[~2024-04-24 19:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-18 6:32 Tom de Vries
2024-04-24 19:40 ` Pedro Alves [this message]
2024-04-24 21:35 ` Tom de Vries
2024-04-26 18:50 ` Pedro Alves
2024-05-01 8:42 ` Tom de Vries
2024-05-01 8:34 Tom de Vries
2024-05-01 9:08 ` Tom de Vries
2024-05-06 11:33 ` Pedro Alves
2024-05-17 3:42 ` Simon Marchi
2024-05-17 9:54 ` Tom de Vries
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