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From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Jens Remus <jremus@linux.ibm.com>, Steven Rostedt <rostedt@goodmis.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Linux Trace Kernel <linux-trace-kernel@vger.kernel.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Andrii Nakryiko <andrii@kernel.org>,
	Indu Bhagat <indu.bhagat@oracle.com>,
	"Jose E. Marchesi" <jemarch@gnu.org>,
	Beau Belgrave <beaub@linux.microsoft.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Florian Weimer <fweimer@redhat.com>, Kees Cook <kees@kernel.org>,
	Carlos O'Donell <codonell@redhat.com>, Sam James <sam@gentoo.org>,
	Dylan Hatch <dylanbhatch@google.com>,
	Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	David Hildenbrand <david@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Liam R. Howlett" <Liam.Howlett@oracle.com>,
	Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
	Michal Hocko <mhocko@suse.com>, Mike Rapoport <rppt@kernel.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>
Subject: Re: [RFC][PATCH] unwind: Add stacktrace_setup system call
Date: Thu, 30 Apr 2026 12:26:33 -0400	[thread overview]
Message-ID: <7d2e8876-b72b-468d-a5ec-56222b5ad5b9@efficios.com> (raw)
In-Reply-To: <46aa63d3-0ebf-4062-aefb-86cf0f05dea1@linux.ibm.com>

On 2026-04-30 12:23, Jens Remus wrote:
> On 4/29/2026 10:03 PM, Steven Rostedt wrote:
>> On Wed, 29 Apr 2026 14:58:15 -0400
>> Steven Rostedt <rostedt@goodmis.org> wrote:
>>
>>>> If the main executable doesn't have a sframe section, I don't see why this
>>>> shouldn't be allowed to add one.
>>>
>>> The address is added via mtree_insert_range() which states it will return
>>> -EEXISTS if the range is occupied.
>>
>> I confirmed this. I changed the test program to load its own sframe section
>> again, and it errors out with -EEXISTS.
> 
> Should an executable be allowed to remove its main executable sframe
> section?  Currently the kernel takes care of registering/unregistering
> that.

I wonder if there are programs out there that replace their exec'd
image with mmap MAP_FIXED, or just rewrite their code without exec ?
If so, it would be good to allow those program to unregister the
initial sframe and perhaps re-register a new one. JITs perhaps ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com

  reply	other threads:[~2026-04-30 16:26 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-29 15:43 [RFC][PATCH] unwind: Add stacktrace_setup system call Steven Rostedt
2026-04-29 15:47 ` Steven Rostedt
2026-04-29 18:32   ` Mathieu Desnoyers
2026-04-30  7:26     ` Geert Uytterhoeven
2026-04-29 18:42 ` Mathieu Desnoyers
2026-04-29 18:55   ` Steven Rostedt
2026-04-29 18:58     ` Steven Rostedt
2026-04-29 20:03       ` Steven Rostedt
2026-04-30 16:23         ` Jens Remus
2026-04-30 16:26           ` Mathieu Desnoyers [this message]
2026-04-30 17:33           ` Steven Rostedt
2026-04-30 17:38 ` Steven Rostedt

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