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Message-ID: <5816d4d5-e038-c90b-5ac2-1a3b3a8b9e46@huawei.com>
Date: Mon, 22 Jul 2024 15:08:29 +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>,
<aou@...s.berkeley.edu>, <tglx@...utronix.de>, <mingo@...hat.com>,
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<julian.stecklina@...erus-technology.de>, <rafael.j.wysocki@...el.com>,
<linux-arm-kernel@...ts.infradead.org>, <linux-riscv@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
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()?
>
> This check should be there and parse_crashkernel() should return error in
> this case.
Hi, Mike
How about the folling rough patch?
--- a/kernel/crash_reserve.c
+++ b/kernel/crash_reserve.c
@@ -313,7 +313,7 @@ int __init parse_crashkernel(char *cmdline,
if (high && ret == -ENOENT) {
ret = __parse_crashkernel(cmdline, 0, crash_size,
crash_base, suffix_tbl[SUFFIX_HIGH]);
- if (ret || !*crash_size)
+ if (ret || !*crash_size || crash_size >= system_ram)
return -EINVAL;
/*
@@ -332,7 +332,7 @@ int __init parse_crashkernel(char *cmdline,
*high = true;
}
#endif
- if (!*crash_size)
+ if (!*crash_size || crash_size >= system_ram)
ret = -EINVAL;
>
>> reserve_crashkernel_generic(cmdline, crash_size, crash_base,
>> low_size, high);
>> }
>> --
>> 2.34.1
>>
>
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