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crash: fix crash memory reserve exceed system memory bug

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On x86_32 Qemu machine with 1GB memory, the cmdline "crashkernel=4G" is ok
as below:
	crashkernel reserved: 0x0000000020000000 - 0x0000000120000000 (4096 MB)

It's similar on other architectures, such as ARM32 and RISCV32.

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 crash_size is greater than system RAM size and
return error if so.

After this patch, there is no above confusing reserve success info.

Link: https://lkml.kernel.org/r/20240729115252.1659112-1-ruanjinjie@huawei.com
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Suggested-by: Mike Rapoport <rppt@kernel.org>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Dave Young <dyoung@redhat.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jinjie Ruan 2024-07-29 19:52:52 +08:00 committed by Andrew Morton
parent 00bd8ec2f7
commit 59d58189f3
1 changed files with 3 additions and 0 deletions
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3
kernel/crash_reserve.c
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@ -335,6 +335,9 @@ int __init parse_crashkernel(char *cmdline,
if (!*crash_size) if (!*crash_size)
ret = -EINVAL; ret = -EINVAL;
if (*crash_size >= system_ram)
ret = -EINVAL;
return ret; return ret;
} }