linux-kernel - Re: [PATCH] arm64: mm: fault: replace the behavior of fault

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: <CANTT7qi=wZvOQP4PFEi7300MbNjsJ2q=WXceHch1BUrtL-WFDQ@mail.gmail.com>
Date: Sat, 14 Dec 2024 18:38:04 +0900
From: Leesoo Ahn <lsahn@...eel.net>
To: lsahn@...eel.net
Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, Kefeng Wang <wangkefeng.wang@...wei.com>, 
	Suren Baghdasaryan <surenb@...gle.com>, Ryan Roberts <ryan.roberts@....com>, 
	Joey Gouly <joey.gouly@....com>, Mark Brown <broonie@...nel.org>, 
	Ard Biesheuvel <ardb@...nel.org>, 
	"moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" <linux-arm-kernel@...ts.infradead.org>, 
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: mm: fault: replace the behavior of fault_info[18]

I just figured out that do_sea(..) isn't the right function to deal
with VMSAv9-128.
Please ignore this patch.

BR
Leesoo

2024년 12월 14일 (토) 오후 6:20, Leesoo Ahn <lsahn@...eel.net>님이 작성:
>
> Replace the behavior of 18th element of fault_info with the 'fn' member to
> do_sea(..) and 'name' to 'level -2 (translation table walk)' based on
> the information[1] of the latest reference manual[2].
>
> The information has described in the chapter, D24.2.40 of [2] and
> DFSC[5:0] bit (stands for Data Fault Status Code).
>
> [1]: Synchronous External abort on translation table walk, level -2
> [2]: Arm Architecture Reference Manual, for A-profile architecture
>
> Signed-off-by: Leesoo Ahn <lsahn@...eel.net>
> ---
>  arch/arm64/mm/fault.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index ef63651099a9..b1c08289a5cc 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -863,7 +863,7 @@ static const struct fault_info fault_info[] = {
>         { do_page_fault,        SIGSEGV, SEGV_ACCERR,   "level 3 permission fault"      },
>         { do_sea,               SIGBUS,  BUS_OBJERR,    "synchronous external abort"    },
>         { do_tag_check_fault,   SIGSEGV, SEGV_MTESERR,  "synchronous tag check fault"   },
> -       { do_bad,               SIGKILL, SI_KERNEL,     "unknown 18"                    },
> +       { do_sea,               SIGKILL, SI_KERNEL,     "level -2 (translation table walk)"     },
>         { do_sea,               SIGKILL, SI_KERNEL,     "level -1 (translation table walk)"     },
>         { do_sea,               SIGKILL, SI_KERNEL,     "level 0 (translation table walk)"      },
>         { do_sea,               SIGKILL, SI_KERNEL,     "level 1 (translation table walk)"      },
> --
> 2.46.1
>