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mm: pass vm_flags to generic_get_unmapped_area()

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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@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Chris Zankel <chris@zankel.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Naveen N Rao <naveen@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Mark Brown 2024-09-04 17:58:00 +01:00 committed by Andrew Morton
parent 25d4054cc9
commit 540e00a729
3 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/mm/book3s64/slice.c
View File

@ -641,7 +641,7 @@ unsigned long arch_get_unmapped_area(struct file *filp,
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(&current->mm->context), 0);
@ -655,7 +655,7 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp,
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(&current->mm->context), 1);

4
include/linux/sched/mm.h
View File

@ -204,11 +204,11 @@ unsigned long mm_get_unmapped_area_vmflags(struct mm_struct *mm,
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) {}

10
mm/mmap.c
View File

@ -738,7 +738,7 @@ unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info)
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 addr,
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 addr,
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 file *filp, unsigned long addr,
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