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Message-ID: <7943149fe955458cb7b57cd483bf41a3aad94684.1706610398.git.christophe.leroy@csgroup.eu>
Date: Tue, 30 Jan 2024 11:34:35 +0100
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Andrew Morton <akpm@...ux-foundation.org>,
Kees Cook <keescook@...omium.org>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
"Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
Andy Lutomirski <luto@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org,
linux-riscv@...ts.infradead.org,
linux-s390@...r.kernel.org,
linux-mm@...ck.org,
steven.price@....com,
Phong Tran <tranmanphong@...il.com>,
mark.rutland@....com,
Greg KH <greg@...ah.com>
Subject: [PATCH v2 4/5] mm: ptdump: Have ptdump_check_wx() return bool
Have ptdump_check_wx() return true when the check is successful
or false otherwise.
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
v2: New
---
arch/arm64/mm/ptdump.c | 11 ++++++++---
arch/powerpc/mm/ptdump/ptdump.c | 13 +++++++++----
arch/riscv/mm/ptdump.c | 11 ++++++++---
arch/s390/mm/dump_pagetables.c | 13 +++++++++----
arch/x86/include/asm/pgtable.h | 2 +-
arch/x86/mm/dump_pagetables.c | 19 ++++++++++++-------
include/linux/ptdump.h | 2 +-
7 files changed, 48 insertions(+), 23 deletions(-)
diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c
index e305b6593c4e..696822f75582 100644
--- a/arch/arm64/mm/ptdump.c
+++ b/arch/arm64/mm/ptdump.c
@@ -345,7 +345,7 @@ static struct ptdump_info kernel_ptdump_info = {
.base_addr = PAGE_OFFSET,
};
-void ptdump_check_wx(void)
+bool ptdump_check_wx(void)
{
struct pg_state st = {
.seq = NULL,
@@ -366,11 +366,16 @@ void ptdump_check_wx(void)
ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
- if (st.wx_pages || st.uxn_pages)
+ if (st.wx_pages || st.uxn_pages) {
pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found, %lu non-UXN pages found\n",
st.wx_pages, st.uxn_pages);
- else
+
+ return false;
+ } else {
pr_info("Checked W+X mappings: passed, no W+X pages found\n");
+
+ return true;
+ }
}
static int __init ptdump_init(void)
diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
index b835c80371cd..9dc239967b77 100644
--- a/arch/powerpc/mm/ptdump/ptdump.c
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -327,7 +327,7 @@ static void __init build_pgtable_complete_mask(void)
pg_level[i].mask |= pg_level[i].flag[j].mask;
}
-void ptdump_check_wx(void)
+bool ptdump_check_wx(void)
{
struct pg_state st = {
.seq = NULL,
@@ -344,15 +344,20 @@ void ptdump_check_wx(void)
};
if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && !mmu_has_feature(MMU_FTR_KERNEL_RO))
- return;
+ return true;
ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
- if (st.wx_pages)
+ if (st.wx_pages) {
pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found\n",
st.wx_pages);
- else
+
+ return false;
+ } else {
pr_info("Checked W+X mappings: passed, no W+X pages found\n");
+
+ return true;
+ }
}
static int __init ptdump_init(void)
diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
index 075265603313..1289cc6d3700 100644
--- a/arch/riscv/mm/ptdump.c
+++ b/arch/riscv/mm/ptdump.c
@@ -335,7 +335,7 @@ static void ptdump_walk(struct seq_file *s, struct ptd_mm_info *pinfo)
ptdump_walk_pgd(&st.ptdump, pinfo->mm, NULL);
}
-void ptdump_check_wx(void)
+bool ptdump_check_wx(void)
{
struct pg_state st = {
.seq = NULL,
@@ -356,11 +356,16 @@ void ptdump_check_wx(void)
ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
- if (st.wx_pages)
+ if (st.wx_pages) {
pr_warn("Checked W+X mappings: failed, %lu W+X pages found\n",
st.wx_pages);
- else
+
+ return false;
+ } else {
pr_info("Checked W+X mappings: passed, no W+X pages found\n");
+
+ return true;
+ }
}
static int ptdump_show(struct seq_file *m, void *v)
diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index 99da5a5602a8..ffd07ed7b4af 100644
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -192,7 +192,7 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
}
}
-void ptdump_check_wx(void)
+bool ptdump_check_wx(void)
{
struct pg_state st = {
.ptdump = {
@@ -215,14 +215,19 @@ void ptdump_check_wx(void)
};
if (!MACHINE_HAS_NX)
- return;
+ return true;
ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
- if (st.wx_pages)
+ if (st.wx_pages) {
pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found\n", st.wx_pages);
- else
+
+ return false;
+ } else {
pr_info("Checked W+X mappings: passed, no %sW+X pages found\n",
(nospec_uses_trampoline() || !static_key_enabled(&cpu_has_bear)) ?
"unexpected " : "");
+
+ return true;
+ }
}
#ifdef CONFIG_PTDUMP_DEBUGFS
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 6c979028e521..b50b2ef63672 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -31,7 +31,7 @@ struct seq_file;
void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm);
void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm,
bool user);
-void ptdump_walk_pgd_level_checkwx(void);
+bool ptdump_walk_pgd_level_checkwx(void);
#define ptdump_check_wx ptdump_walk_pgd_level_checkwx
void ptdump_walk_user_pgd_level_checkwx(void);
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 0008524eebe9..c58c01f560fd 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -362,7 +362,7 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
}
}
-static void ptdump_walk_pgd_level_core(struct seq_file *m,
+bool void ptdump_walk_pgd_level_core(struct seq_file *m,
struct mm_struct *mm, pgd_t *pgd,
bool checkwx, bool dmesg)
{
@@ -391,12 +391,17 @@ static void ptdump_walk_pgd_level_core(struct seq_file *m,
ptdump_walk_pgd(&st.ptdump, mm, pgd);
if (!checkwx)
- return;
- if (st.wx_pages)
+ return true;
+ if (st.wx_pages) {
pr_info("x86/mm: Checked W+X mappings: FAILED, %lu W+X pages found.\n",
st.wx_pages);
- else
+
+ return false;
+ } else {
pr_info("x86/mm: Checked W+X mappings: passed, no W+X pages found.\n");
+
+ return true;
+ }
}
void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm)
@@ -431,12 +436,12 @@ void ptdump_walk_user_pgd_level_checkwx(void)
#endif
}
-void ptdump_walk_pgd_level_checkwx(void)
+bool ptdump_walk_pgd_level_checkwx(void)
{
if (!(__supported_pte_mask & _PAGE_NX))
- return;
+ return true;
- ptdump_walk_pgd_level_core(NULL, &init_mm, INIT_PGD, true, false);
+ return ptdump_walk_pgd_level_core(NULL, &init_mm, INIT_PGD, true, false);
}
static int __init pt_dump_init(void)
diff --git a/include/linux/ptdump.h b/include/linux/ptdump.h
index c10513739bf9..953b61696ccf 100644
--- a/include/linux/ptdump.h
+++ b/include/linux/ptdump.h
@@ -19,7 +19,7 @@ struct ptdump_state {
};
void ptdump_walk_pgd(struct ptdump_state *st, struct mm_struct *mm, pgd_t *pgd);
-void ptdump_check_wx(void);
+bool ptdump_check_wx(void);
static inline void debug_checkwx(void)
{
--
2.43.0
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