[PATCH v2 3/5] powerpc,s390: ptdump: Define ptdump_check_wx() regardless of CONFIG_DEBUG_WX

Christophe Leroy
2024-01-30T10:37:17Z

Following patch will use ptdump_check_wx() regardless of
CONFIG_DEBUG_WX, so define it at all times on powerpc and s390
just like other architectures. Though keep the WARN_ON_ONCE()
only when CONFIG_DEBUG_WX is set.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/mm/ptdump/ptdump.c | 7 +++----
arch/s390/mm/dump_pagetables.c | 7 ++-----
2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
index 620d4917ebe8..b835c80371cd 100644
--- a/arch/powerpc/mm/ptdump/ptdump.c
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -184,13 +184,14 @@ static void note_prot_wx(struct pg_state *st, unsigned long addr)
{
pte_t pte = __pte(st->current_flags);

- if (!IS_ENABLED(CONFIG_DEBUG_WX) || !st->check_wx)
+ if (!st->check_wx)
return;

if (!pte_write(pte) || !pte_exec(pte))
return;

- WARN_ONCE(1, "powerpc/mm: Found insecure W+X mapping at address %p/%pS\n",
+ WARN_ONCE(IS_ENABLED(CONFIG_DEBUG_WX),
+ "powerpc/mm: Found insecure W+X mapping at address %p/%pS\n",
(void *)st->start_address, (void *)st->start_address);

st->wx_pages += (addr - st->start_address) / PAGE_SIZE;
@@ -326,7 +327,6 @@ static void __init build_pgtable_complete_mask(void)
pg_level[i].mask |= pg_level[i].flag[j].mask;
}

-#ifdef CONFIG_DEBUG_WX
void ptdump_check_wx(void)
{
struct pg_state st = {
@@ -354,7 +354,6 @@ void ptdump_check_wx(void)
else
pr_info("Checked W+X mappings: passed, no W+X pages found\n");
}
-#endif

static int __init ptdump_init(void)
{
diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index 8dcb4e0c71bd..99da5a5602a8 100644
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -121,7 +121,6 @@ static void print_prot(struct seq_file *m, unsigned int pr, int level)

static void note_prot_wx(struct pg_state *st, unsigned long addr)
{
-#ifdef CONFIG_DEBUG_WX
if (!st->check_wx)
return;
if (st->current_prot & _PAGE_INVALID)
@@ -138,10 +137,10 @@ static void note_prot_wx(struct pg_state *st, unsigned long addr)
*/
if (addr == PAGE_SIZE && (nospec_uses_trampoline() || !static_key_enabled(&cpu_has_bear)))
return;
- WARN_ONCE(1, "s390/mm: Found insecure W+X mapping at address %pS\n",
+ WARN_ONCE(IS_ENABLED(CONFIG_DEBUG_WX),
+ "s390/mm: Found insecure W+X mapping at address %pS\n",
(void *)st->start_address);
st->wx_pages += (addr - st->start_address) / PAGE_SIZE;
-#endif /* CONFIG_DEBUG_WX */
}

static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level, u64 val)
@@ -193,7 +192,6 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
}
}

-#ifdef CONFIG_DEBUG_WX
void ptdump_check_wx(void)
{
struct pg_state st = {
@@ -226,7 +224,6 @@ void ptdump_check_wx(void)
(nospec_uses_trampoline() || !static_key_enabled(&cpu_has_bear)) ?
"unexpected " : "");
}
-#endif /* CONFIG_DEBUG_WX */

#ifdef CONFIG_PTDUMP_DEBUGFS
static int ptdump_show(struct seq_file *m, void *v)