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From: Florian Weimer <fweimer@redhat.com>
To: Kees Cook <keescook@chromium.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>,
	 Andrew Morton <akpm@linux-foundation.org>,
	 linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	 linux-api@vger.kernel.org,  x86@kernel.org
Subject: Re: [PATCH v2] ELF: supply userspace with available page shifts (AT_PAGE_SHIFT_MASK)
Date: Fri, 08 Dec 2023 19:35:25 +0100	[thread overview]
Message-ID: <87lea4czki.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <202312081027.BA44B7B3@keescook> (Kees Cook's message of "Fri, 8 Dec 2023 10:29:25 -0800")

* Kees Cook:

> I significantly prefer APIs not being arch-specific, so I'd prefer we
> always include AT_PAGE_SHIFT_MASK. For an architecture that doesn't
> define its own ARCH_AT_PAGE_SHIFT_MASK, it's not _inaccurate_ to report
> 1 << PAGE_SHIFT, but it might be incomplete.

The downside is that as an application programmer, I have to go and
chase for the information the legacy way if I encounter
getauxval(AT_PAGE_SHIFT_MASK) == getpagesize() for a longer time
because the interface does not signal the absence of any extended
page sizes.

Thanks,
Florian


  reply	other threads:[~2023-12-08 18:35 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-12-04 17:18 [PATCH] ELF: supply userspace with available page shifts (AT_PAGE_SHIFT_LIST) Alexey Dobriyan
2023-12-05  9:51 ` Florian Weimer
2023-12-05 14:26   ` Alexey Dobriyan
2023-12-05 16:01   ` [PATCH v2] ELF: supply userspace with available page shifts (AT_PAGE_SHIFT_MASK) Alexey Dobriyan
2023-12-06 20:47     ` Kees Cook
2023-12-06 21:05       ` Florian Weimer
2023-12-06 21:09         ` Kees Cook
2023-12-07 15:04           ` Alexey Dobriyan
2023-12-07 14:57       ` Alexey Dobriyan
2023-12-07 15:32         ` Florian Weimer
2023-12-08 18:29         ` Kees Cook
2023-12-08 18:35           ` Florian Weimer [this message]
2023-12-08 18:38             ` Kees Cook
2023-12-09  9:44           ` Alexey Dobriyan
2023-12-07 18:44     ` [PATCH v3] ELF: AT_PAGE_SHIFT_MASK -- supply userspace with available page shifts Alexey Dobriyan
2023-12-12 21:09       ` Kees Cook

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