From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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Subject: Re: [PATCH 1/3] module: Rename module_alloc() to text_alloc() and move to kernel proper
Date: Mon, 13 Jul 2020 19:34:10 +0100 [thread overview]
Message-ID: <20200713183410.GY1551@shell.armlinux.org.uk> (raw)
In-Reply-To: <20200713182030.1418041-1-jarkko.sakkinen@linux.intel.com>
On Mon, Jul 13, 2020 at 09:19:37PM +0300, Jarkko Sakkinen wrote:
> Rename module_alloc() to text_alloc() and module_memfree() to
> text_memfree(), and move them to kernel/text.c, which is unconditionally
> compiled to the kernel proper. This allows kprobes, ftrace and bpf to
> allocate space for executable code without requiring to compile the modules
> support (CONFIG_MODULES=y) in.
I'm not sure this is a good idea for 32-bit ARM. The code you are
moving for 32-bit ARM is quite specific to module use in that it also
supports allocating from the vmalloc area, where the module code
knows to add PLT entries.
If the other proposed users of this text_alloc() do not have the logic
to add PLT entries when branches between kernel code and this
allocation are not reachable by, e.g. a 26-bit signed offset for 32-bit
ARM code, then this code is not suitable for that use.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
next prev parent reply other threads:[~2020-07-13 22:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-13 18:19 [PATCH 1/3] module: Rename module_alloc() to text_alloc() and move to kernel proper Jarkko Sakkinen
2020-07-13 18:34 ` Russell King - ARM Linux admin [this message]
2020-07-14 9:49 ` Jarkko Sakkinen
2020-07-14 9:53 ` Russell King - ARM Linux admin
2020-07-14 11:43 ` Jarkko Sakkinen
2020-07-13 19:49 ` Ard Biesheuvel
2020-07-14 2:04 ` Steven Rostedt
2020-07-14 6:35 ` Ard Biesheuvel
2020-07-14 9:52 ` Jarkko Sakkinen
2020-07-14 10:17 ` Ard Biesheuvel
2020-07-14 10:33 ` Russell King - ARM Linux admin
2020-07-14 11:45 ` Peter Zijlstra
2020-07-14 12:11 ` Jarkko Sakkinen
2020-07-14 11:55 ` Jarkko Sakkinen
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