linux-kernel - Re: [PATCH 3/4] arm64: separate code and data virtual memory allocation

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Message-ID: <dc1ebba5-c4a4-496d-8a46-1e58a796e4ad@csgroup.eu>
Date: Wed, 21 Feb 2024 07:20:09 +0000
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Maxwell Bland <mbland@...orola.com>,
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Subject: Re: [PATCH 3/4] arm64: separate code and data virtual memory
 allocation



Le 20/02/2024 à 21:32, Maxwell Bland a écrit :
> [Vous ne recevez pas souvent de courriers de mbland@...orola.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> 
> Current BPF and kprobe instruction allocation interfaces do not match
> the base kernel and intermingle code and data pages within the same
> sections. In the case of BPF, this appears to be a result of code
> duplication between the kernel's JIT compiler and arm64's JIT.  However,
> This is no longer necessary given the possibility of overriding vmalloc
> wrapper functions.

Why do you need to override vmalloc wrapper functions for that ?

See powerpc, for kprobes, alloc_insn_page() uses module_alloc().
On powerpc, the approach is that vmalloc() provides non-exec memory 
while module_alloc() provides executable memory.

Christophe