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riscv: mm: Take memory hotplug read-lock during kernel page table dump

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During memory hot remove, the ptdump functionality can end up touching
stale data. Avoid any potential crashes (or worse), by holding the
memory hotplug read-lock while traversing the page table.

This change is analogous to arm64's commit bf2b59f60e ("arm64/mm:
Hold memory hotplug lock while walking for kernel page table dump").

Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20240605114100.315918-8-bjorn@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Björn Töpel 2024-06-05 13:40:50 +02:00 committed by Palmer Dabbelt
parent c75a74f4ba
commit 37992b7f10
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1 changed files with 3 additions and 0 deletions
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3
arch/riscv/mm/ptdump.c
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@ -6,6 +6,7 @@
#include <linux/efi.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/memory_hotplug.h>
#include <linux/seq_file.h>
#include <linux/ptdump.h>
@ -370,7 +371,9 @@ bool ptdump_check_wx(void)
static int ptdump_show(struct seq_file *m, void *v)
{
get_online_mems();
ptdump_walk(m, m->private);
put_online_mems();
return 0;
}