From: Charlie Jenkins <charlie@rivosinc.com>
To: Alexandre Ghiti <alexghiti@rivosinc.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
syzbot+afb726d49f84c8d95ee1@syzkaller.appspotmail.com
Subject: Re: [PATCH -fixes v2] riscv: Fix wrong usage of lm_alias() when splitting a huge linear mapping
Date: Fri, 15 Dec 2023 14:33:12 -0800 [thread overview]
Message-ID: <ZXzUKD95hmTPDbaq@ghost> (raw)
In-Reply-To: <20231212195400.128457-1-alexghiti@rivosinc.com>
On Tue, Dec 12, 2023 at 08:54:00PM +0100, Alexandre Ghiti wrote:
> lm_alias() can only be used on kernel mappings since it explicitly uses
> __pa_symbol(), so simply fix this by checking where the address belongs
> to before.
>
> Fixes: 311cd2f6e253 ("riscv: Fix set_memory_XX() and set_direct_map_XX() by splitting huge linear mappings")
> Reported-by: syzbot+afb726d49f84c8d95ee1@syzkaller.appspotmail.com
> Closes: https://lore.kernel.org/linux-riscv/000000000000620dd0060c02c5e1@google.com/
> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
> ---
>
> Changes in v2:
> - Fix llvm warning about unitialized return value
>
> arch/riscv/mm/pageattr.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c
> index fc5fc4f785c4..96cbda683936 100644
> --- a/arch/riscv/mm/pageattr.c
> +++ b/arch/riscv/mm/pageattr.c
> @@ -305,8 +305,13 @@ static int __set_memory(unsigned long addr, int numpages, pgprot_t set_mask,
> goto unlock;
> }
> } else if (is_kernel_mapping(start) || is_linear_mapping(start)) {
> - lm_start = (unsigned long)lm_alias(start);
> - lm_end = (unsigned long)lm_alias(end);
> + if (is_kernel_mapping(start)) {
> + lm_start = (unsigned long)lm_alias(start);
> + lm_end = (unsigned long)lm_alias(end);
> + } else {
> + lm_start = start;
> + lm_end = end;
> + }
>
> ret = split_linear_mapping(lm_start, lm_end);
> if (ret)
> --
> 2.39.2
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2023-12-15 22:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-12 19:54 [PATCH -fixes v2] riscv: Fix wrong usage of lm_alias() when splitting a huge linear mapping Alexandre Ghiti
2023-12-15 22:33 ` Charlie Jenkins [this message]
2023-12-21 3:00 ` patchwork-bot+linux-riscv
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