The patch titled
Subject: mm: pass vm_flags to generic_get_unmapped_area()
has been added to the -mm mm-unstable branch. Its filename is
mm-pass-vm_flags-to-generic_get_unmapped_area.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-pass-vm_flags-to-generic_get_unmapped_area.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Mark Brown <broonie@xxxxxxxxxx>
Subject: mm: pass vm_flags to generic_get_unmapped_area()
Date: Wed, 04 Sep 2024 17:58:00 +0100
In preparation for using vm_flags to ensure guard pages for shadow stacks
supply them as an argument to generic_get_unmapped_area(). The only user
outside of the core code is the PowerPC book3s64 implementation which is
trivially wrapping the generic implementation in the radix_enabled() case.
No functional changes.
Link: https://lkml.kernel.org/r/20240904-mm-generic-shadow-stack-guard-v2-2-a46b8b6dc0ed@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Acked-by: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Cc: Andreas Larsson <andreas@xxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Chris Zankel <chris@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: "Edgecombe, Rick P" <rick.p.edgecombe@xxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Cc: Guo Ren <guoren@xxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Cc: Matt Turner <mattst88@xxxxxxxxx>
Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Naveen N Rao <naveen@xxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Richard Henderson <richard.henderson@xxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Vineet Gupta <vgupta@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: WANG Xuerui <kernel@xxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/book3s64/slice.c | 4 ++--
include/linux/sched/mm.h | 4 ++--
mm/mmap.c | 10 ++++++----
3 files changed, 10 insertions(+), 8 deletions(-)
--- a/arch/powerpc/mm/book3s64/slice.c~mm-pass-vm_flags-to-generic_get_unmapped_area
+++ a/arch/powerpc/mm/book3s64/slice.c
@@ -641,7 +641,7 @@ unsigned long arch_get_unmapped_area(str
vm_flags_t vm_flags)
{
if (radix_enabled())
- return generic_get_unmapped_area(filp, addr, len, pgoff, flags);
+ return generic_get_unmapped_area(filp, addr, len, pgoff, flags, vm_flags);
return slice_get_unmapped_area(addr, len, flags,
mm_ctx_user_psize(¤t->mm->context), 0);
@@ -655,7 +655,7 @@ unsigned long arch_get_unmapped_area_top
vm_flags_t vm_flags)
{
if (radix_enabled())
- return generic_get_unmapped_area_topdown(filp, addr0, len, pgoff, flags);
+ return generic_get_unmapped_area_topdown(filp, addr0, len, pgoff, flags, vm_flags);
return slice_get_unmapped_area(addr0, len, flags,
mm_ctx_user_psize(¤t->mm->context), 1);
--- a/include/linux/sched/mm.h~mm-pass-vm_flags-to-generic_get_unmapped_area
+++ a/include/linux/sched/mm.h
@@ -204,11 +204,11 @@ unsigned long mm_get_unmapped_area_vmfla
unsigned long
generic_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
- unsigned long flags);
+ unsigned long flags, vm_flags_t vm_flags);
unsigned long
generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
- unsigned long flags);
+ unsigned long flags, vm_flags_t vm_flags);
#else
static inline void arch_pick_mmap_layout(struct mm_struct *mm,
struct rlimit *rlim_stack) {}
--- a/mm/mmap.c~mm-pass-vm_flags-to-generic_get_unmapped_area
+++ a/mm/mmap.c
@@ -738,7 +738,7 @@ unsigned long vm_unmapped_area(struct vm
unsigned long
generic_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
- unsigned long flags)
+ unsigned long flags, vm_flags_t vm_flags)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma, *prev;
@@ -772,7 +772,8 @@ arch_get_unmapped_area(struct file *filp
unsigned long len, unsigned long pgoff,
unsigned long flags, vm_flags_t vm_flags)
{
- return generic_get_unmapped_area(filp, addr, len, pgoff, flags);
+ return generic_get_unmapped_area(filp, addr, len, pgoff, flags,
+ vm_flags);
}
#endif
@@ -783,7 +784,7 @@ arch_get_unmapped_area(struct file *filp
unsigned long
generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
- unsigned long flags)
+ unsigned long flags, vm_flags_t vm_flags)
{
struct vm_area_struct *vma, *prev;
struct mm_struct *mm = current->mm;
@@ -836,7 +837,8 @@ arch_get_unmapped_area_topdown(struct fi
unsigned long len, unsigned long pgoff,
unsigned long flags, vm_flags_t vm_flags)
{
- return generic_get_unmapped_area_topdown(filp, addr, len, pgoff, flags);
+ return generic_get_unmapped_area_topdown(filp, addr, len, pgoff, flags,
+ vm_flags);
}
#endif
_
Patches currently in -mm which might be from broonie@xxxxxxxxxx are
mm-make-arch_get_unmapped_area-take-vm_flags-by-default.patch
mm-pass-vm_flags-to-generic_get_unmapped_area.patch
mm-care-about-shadow-stack-guard-gap-when-getting-an-unmapped-area.patch
