| Message ID | 20240909124721.1672199-5-sebastianene@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: ptdump: View the second stage page-tables | expand |
On Mon, Sep 09, 2024 at 12:47:20PM +0000, Sebastian Ene wrote: > 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 <sebastianene@google.com> > --- > arch/arm64/mm/ptdump.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) Acked-by: Will Deacon <will@kernel.org> Will
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)
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 <sebastianene@google.com> --- arch/arm64/mm/ptdump.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)