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Message-ID: <32100260-53a3-cebc-9aaf-a94a6ac07793@huawei.com>
Date: Mon, 22 Jul 2024 15:04:39 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: Mike Rapoport <rppt@...nel.org>
CC: <linux@...linux.org.uk>, <paul.walmsley@...ive.com>, <palmer@...belt.com>,
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<linux-arm-kernel@...ts.infradead.org>, <linux-riscv@...ts.infradead.org>,
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Subject: Re: [PATCH v4 3/3] riscv: kdump: Fix crash memory reserve exceed
system memory bug
On 2024/7/22 14:38, Mike Rapoport wrote:
> Hi,
>
> On Mon, Jul 22, 2024 at 11:57:01AM +0800, Jinjie Ruan wrote:
>> Similar with x86_32, on Riscv32 Qemu "virt" machine with 1GB memory, the
>> crash kernel "crashkernel=4G" is ok as below:
>> crashkernel reserved: 0x00000000bf400000 - 0x00000001bf400000 (4096 MB)
>>
>> The cause is that the crash_size is parsed and printed with "unsigned long
>> long" data type which is 8 bytes but allocated used with "phys_addr_t"
>> which is 4 bytes in memblock_phys_alloc_range().
>>
>> Fix it by checking if the crash_size is greater than system RAM size and
>> warn out as parse_crashkernel_mem() do it if so.
>>
>> After this patch, it fails and there is no above confusing reserve
>> success info.
>>
>> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
>> ---
>> arch/riscv/mm/init.c | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
>> index bfa2dea95354..5d66a4937fcd 100644
>> --- a/arch/riscv/mm/init.c
>> +++ b/arch/riscv/mm/init.c
>> @@ -1381,6 +1381,11 @@ static void __init arch_reserve_crashkernel(void)
>> if (ret)
>> return;
>>
>> + if (crash_size >= memblock_phys_mem_size()) {
>> + pr_warn("Crashkernel: invalid size.");
>> + return;
>> + }
>> +
>
> What the point of adding three identical checks right after the call to
> parse_crashkernel()?
Maybe you are right, the original version checks in parse_crashkernel
(), but there's a problem.
>
> This check should be there and parse_crashkernel() should return error in
> this case.
Thank you very much, I'll fix it like this in v5.
>
>> reserve_crashkernel_generic(cmdline, crash_size, crash_base,
>> low_size, high);
>> }
>> --
>> 2.34.1
>>
>
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