The patch titled
Subject: mm: ptdump: have ptdump_check_wx() return bool
has been added to the -mm mm-unstable branch. Its filename is
mm-ptdump-have-ptdump_check_wx-return-bool.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-ptdump-have-ptdump_check_wx-return-bool.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Subject: mm: ptdump: have ptdump_check_wx() return bool
Date: Tue, 30 Jan 2024 11:34:35 +0100
Have ptdump_check_wx() return true when the check is successful or false
otherwise.
Link: https://lkml.kernel.org/r/7943149fe955458cb7b57cd483bf41a3aad94684.1706610398.git.christophe.leroy@xxxxxxxxxx
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Cc: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@xxxxxxxxxx>
Cc: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: "Naveen N. Rao" <naveen.n.rao@xxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Phong Tran <tranmanphong@xxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Steven Price <steven.price@xxxxxxx>
Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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(-)
--- a/arch/arm64/mm/ptdump.c~mm-ptdump-have-ptdump_check_wx-return-bool
+++ a/arch/arm64/mm/ptdump.c
@@ -345,7 +345,7 @@ static struct ptdump_info kernel_ptdump_
.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)
--- a/arch/powerpc/mm/ptdump/ptdump.c~mm-ptdump-have-ptdump_check_wx-return-bool
+++ a/arch/powerpc/mm/ptdump/ptdump.c
@@ -327,7 +327,7 @@ static void __init build_pgtable_complet
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)
--- a/arch/riscv/mm/ptdump.c~mm-ptdump-have-ptdump_check_wx-return-bool
+++ a/arch/riscv/mm/ptdump.c
@@ -335,7 +335,7 @@ static void ptdump_walk(struct seq_file
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)
--- a/arch/s390/mm/dump_pagetables.c~mm-ptdump-have-ptdump_check_wx-return-bool
+++ a/arch/s390/mm/dump_pagetables.c
@@ -192,7 +192,7 @@ static void note_page(struct ptdump_stat
}
}
-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
--- a/arch/x86/include/asm/pgtable.h~mm-ptdump-have-ptdump_check_wx-return-bool
+++ a/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);
--- a/arch/x86/mm/dump_pagetables.c~mm-ptdump-have-ptdump_check_wx-return-bool
+++ a/arch/x86/mm/dump_pagetables.c
@@ -362,7 +362,7 @@ static void note_page(struct ptdump_stat
}
}
-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(s
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(
#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)
--- a/include/linux/ptdump.h~mm-ptdump-have-ptdump_check_wx-return-bool
+++ a/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)
{
_
Patches currently in -mm which might be from christophe.leroy@xxxxxxxxxx are
arm-ptdump-rename-config_debug_wx-to-config_arm_debug_wx.patch
arm64-powerpc-riscv-s390-x86-ptdump-refactor-config_debug_wx.patch
powerpcs390-ptdump-define-ptdump_check_wx-regardless-of-config_debug_wx.patch
mm-ptdump-have-ptdump_check_wx-return-bool.patch
mm-ptdump-add-check_wx_pages-debugfs-attribute.patch
