From: Lisa Robinson <lisa@bytefly.space>
To: r@hev.cc
Cc: ardb@kernel.org, chenhuacai@kernel.org,
ilias.apalodimas@linaro.org, kernel@xen0n.name,
linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
loongarch@lists.linux.dev, Lisa Robinson <lisa@bytefly.space>
Subject: Re: [RFC PATCH 2/3] efi/loongarch: Randomize kernel preferred address for KASLR
Date: Mon, 27 Apr 2026 05:07:35 +0000 [thread overview]
Message-ID: <20260427050735.3410-1-lisa@bytefly.space> (raw)
In-Reply-To: <20260426120231.532644-3-r@hev.cc>
Hi Rui
> diff --git a/drivers/firmware/efi/libstub/loongarch.c b/drivers/firmware/efi/libstub/loongarch.c
> index 9825f5218137..80ba7d69e1b3 100644
> --- a/drivers/firmware/efi/libstub/loongarch.c
> +++ b/drivers/firmware/efi/libstub/loongarch.c
> @@ -38,6 +38,21 @@ static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
> return EFI_SUCCESS;
> }
>
> +unsigned long efi_get_kimg_kaslr_address(void)
> +{
> + unsigned int random_offset = 0;
> +
> +#ifdef CONFIG_RANDOMIZE_BASE
> + if (!efi_nokaslr) {
> + efi_get_random_bytes(sizeof(random_offset), (u8 *)&random_offset);
> + random_offset ^= (rdtime_l() << 16);
random_offset &= ~(efi_get_kimg_min_align() - 1);
> + random_offset &= (CONFIG_RANDOMIZE_BASE_MAX_OFFSET - 1);
> + }
> +#endif
> +
> + return PHYSADDR(VMLINUX_LOAD_ADDRESS) + random_offset;
> +}
> +
> unsigned long __weak kernel_entry_address(unsigned long kernel_addr,
> efi_loaded_image_t *image)
> {
--
Lisa
next prev parent reply other threads:[~2026-04-27 5:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-26 12:02 [RFC PATCH 0/3] LoongArch: Move KASLR to EFI stub to avoid initrd overlap WANG Rui
2026-04-26 12:02 ` [RFC PATCH 1/3] LoongArch: Allow rdtime_h and rdtime_l in 64-bit builds WANG Rui
2026-04-26 12:02 ` [RFC PATCH 2/3] efi/loongarch: Randomize kernel preferred address for KASLR WANG Rui
2026-04-27 5:07 ` Lisa Robinson [this message]
2026-04-27 7:49 ` hev
2026-04-26 12:02 ` [RFC PATCH 3/3] LoongArch: Remove KASLR handling from relocate_kernel WANG Rui
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