[PATCH v10 4/5] arm64: ptdump: Don't override the level when operating on the stage-2 tables
From: Sebastian Ene <hidden>
Date: 2024-09-09 12:47:35
Also in:
kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Ptdump uses the init_mm structure directly to dump the kernel pagetables. When ptdump is called on the stage-2 pagetables, this mm argument is not used. Prevent the level from being overwritten by checking the argument against NULL. Signed-off-by: Sebastian Ene <redacted> --- arch/arm64/mm/ptdump.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c
index ca53ef274a8b..264c5f9b97d8 100644
--- a/arch/arm64/mm/ptdump.c
+++ b/arch/arm64/mm/ptdump.c@@ -197,8 +197,8 @@ void note_page(struct ptdump_state *pt_st, unsigned long addr, int level, u64 prot = 0; /* check if the current level has been folded dynamically */ - if ((level == 1 && mm_p4d_folded(st->mm)) || - (level == 2 && mm_pud_folded(st->mm))) + if (st->mm && ((level == 1 && mm_p4d_folded(st->mm)) || + (level == 2 && mm_pud_folded(st->mm)))) level = 0; if (level >= 0)
--
2.46.0.469.g59c65b2a67-goog