Commit 79c4c728 authored by Sebastian Ene's avatar Sebastian Ene Committed by Marc Zyngier
Browse files

arm64: ptdump: Don't override the level when operating on the stage-2 tables 



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: default avatarSebastian Ene <sebastianene@google.com>
Acked-by: default avatarWill Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20240909124721.1672199-5-sebastianene@google.com


Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
parent 9182301a

arch/arm64/mm/ptdump.c

+2 −2
Original line number Diff line number Diff line
@@ -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)