linux-kernel - Re: [PATCH 1/2] arm64: efi: Fix NULL pointer dereference by initializing user

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Message-ID: <a060d8ec023cb7b8dbec0cb4105d03fb24c57a3d.camel@surriel.com>
Date: Tue, 23 Dec 2025 14:24:33 -0500
From: Rik van Riel <riel@...riel.com>
To: Breno Leitao <leitao@...ian.org>, Ard Biesheuvel <ardb@...nel.org>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, puranjay@...nel.org, 
	usamaarif642@...il.com, kernel-team@...a.com
Subject: Re: [PATCH 1/2] arm64: efi: Fix NULL pointer dereference by
 initializing user_ns

On Tue, 2025-12-23 at 02:55 -0800, Breno Leitao wrote:
> 
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index a9070d00b833..55452e61af31 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -73,6 +73,7 @@ struct mm_struct efi_mm = {
>  	MMAP_LOCK_INITIALIZER(efi_mm)
>  	.page_table_lock	=
> __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
>  	.mmlist			=
> LIST_HEAD_INIT(efi_mm.mmlist),
> +	.user_ns		= &init_user_ns,
>  	.cpu_bitmap		= { [BITS_TO_LONGS(NR_CPUS)] = 0},
>  #ifdef CONFIG_SCHED_MM_CID
>  	.mm_cid.lock		=
> __RAW_SPIN_LOCK_UNLOCKED(efi_mm.mm_cid.lock),

Seems legit?

Acked-by: Rik van Riel <riel@...riel.com>

-- 
All Rights Reversed.