lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20230930-unnoticed-slacked-0bf5696cc265@spud>
Date:   Sat, 30 Sep 2023 10:14:34 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Alexandre Ghiti <alexghiti@...osinc.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Jones <ajones@...tanamicro.com>,
        Qinglin Pan <panqinglin2020@...as.ac.cn>,
        Ryan Roberts <ryan.roberts@....com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -fixes 2/2] riscv: Fix set_huge_pte_at() for NAPOT
 mappings when a swap entry is set

On Thu, Sep 28, 2023 at 05:18:46PM +0200, Alexandre Ghiti wrote:
> We used to determine the number of page table entries to set for a NAPOT
> hugepage by using the pte value which actually fails when the pte to set is
> a swap entry.
> 
> So take advantage of a recent fix for arm64 reported in [1] which
> introduces the size of the mapping as an argument of set_huge_pte_at(): we
> can then use this size to compute the number of page table entries to set
> for a NAPOT region.
> 
> Fixes: 82a1a1f3bfb6 ("riscv: mm: support Svnapot in hugetlb page")
> Reported-by: Ryan Roberts <ryan.roberts@....com>
> Closes: https://lore.kernel.org/linux-arm-kernel/20230922115804.2043771-1-ryan.roberts@arm.com/ [1]
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>

Breaks the build. Your $subject marks this for -fixes, but this will not
build there, as it relies on content that's not yet in that branch.
AFAICT, you're going to have to resend this with akpm on CC, as the
dependency is in his tree...

Thanks,
Conor.

> ---
>  arch/riscv/mm/hugetlbpage.c | 19 +++++++++++++------
>  1 file changed, 13 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
> index e4a2ace92dbe..b52f0210481f 100644
> --- a/arch/riscv/mm/hugetlbpage.c
> +++ b/arch/riscv/mm/hugetlbpage.c
> @@ -183,15 +183,22 @@ void set_huge_pte_at(struct mm_struct *mm,
>  		     pte_t pte,
>  		     unsigned long sz)
>  {
> +	unsigned long hugepage_shift;
>  	int i, pte_num;
>  
> -	if (!pte_napot(pte)) {
> -		set_pte_at(mm, addr, ptep, pte);
> -		return;
> -	}
> +	if (sz >= PGDIR_SIZE)
> +		hugepage_shift = PGDIR_SHIFT;
> +	else if (sz >= P4D_SIZE)
> +		hugepage_shift = P4D_SHIFT;
> +	else if (sz >= PUD_SIZE)
> +		hugepage_shift = PUD_SHIFT;
> +	else if (sz >= PMD_SIZE)
> +		hugepage_shift = PMD_SHIFT;
> +	else
> +		hugepage_shift = PAGE_SHIFT;
>  
> -	pte_num = napot_pte_num(napot_cont_order(pte));
> -	for (i = 0; i < pte_num; i++, ptep++, addr += PAGE_SIZE)
> +	pte_num = sz >> hugepage_shift;
> +	for (i = 0; i < pte_num; i++, ptep++, addr += (1 << hugepage_shift))
>  		set_pte_at(mm, addr, ptep, pte);
>  }
>  
> -- 
> 2.39.2
> 
> 
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ