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From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Rick Edgecombe <rick.p.edgecombe@intel.com>,
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Cc: "linux-alpha@vger.kernel.org" <linux-alpha@vger.kernel.org>,
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Subject: Re: [PATCH v2 5/9] mm: Initialize struct vm_unmapped_area_info
Date: Tue, 27 Feb 2024 07:02:59 +0000	[thread overview]
Message-ID: <94a2b919-e03b-4ade-b13e-7774849dc02b@csgroup.eu> (raw)
In-Reply-To: <20240226190951.3240433-6-rick.p.edgecombe@intel.com>



Le 26/02/2024 à 20:09, Rick Edgecombe a écrit :
> Future changes will need to add a field to struct vm_unmapped_area_info.
> This would cause trouble for any archs that don't initialize the
> struct. Currently every user sets each field, so if new fields are
> added, the core code parsing the struct will see garbage in the new
> field.
> 
> It could be possible to initialize the new field for each arch to 0, but
> instead simply inialize the field with a C99 struct inializing syntax.

Why doing a full init of the struct when all fields are re-written a few 
lines after ?

If I take the exemple of powerpc function slice_find_area_bottomup():

	struct vm_unmapped_area_info info;

	info.flags = 0;
	info.length = len;
	info.align_mask = PAGE_MASK & ((1ul << pshift) - 1);
	info.align_offset = 0;

For me it looks better to just add:

	info.new_field = 0; /* or whatever value it needs to have */

Christophe


> 
> Cc: linux-mm@kvack.org
> Cc: linux-alpha@vger.kernel.org
> Cc: linux-snps-arc@lists.infradead.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-csky@vger.kernel.org
> Cc: loongarch@lists.linux.dev
> Cc: linux-mips@vger.kernel.org
> Cc: linux-parisc@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-s390@vger.kernel.org
> Cc: linux-sh@vger.kernel.org
> Cc: sparclinux@vger.kernel.org
> Cc: x86@kernel.org
> Suggested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
> Link: https://lore.kernel.org/lkml/3ynogxcgokc6i6xojbxzzwqectg472laes24u7jmtktlxcch5e@dfytra3ia3zc/#t
> ---
> Hi archs,
> 
> For some context, this is part of a larger series to improve shadow stack
> guard gaps. It involves plumbing a new field via
> struct vm_unmapped_area_info. The first user is x86, but arm and riscv may
> likely use it as well. The change is compile tested only for non-x86 but
> seems like a relatively safe one.
> 
> Thanks,
> 
> Rick
> 
> v2:
>   - New patch
> ---
>   arch/alpha/kernel/osf_sys.c      | 2 +-
>   arch/arc/mm/mmap.c               | 2 +-
>   arch/arm/mm/mmap.c               | 4 ++--
>   arch/csky/abiv1/mmap.c           | 2 +-
>   arch/loongarch/mm/mmap.c         | 2 +-
>   arch/mips/mm/mmap.c              | 2 +-
>   arch/parisc/kernel/sys_parisc.c  | 2 +-
>   arch/powerpc/mm/book3s64/slice.c | 4 ++--
>   arch/s390/mm/hugetlbpage.c       | 4 ++--
>   arch/s390/mm/mmap.c              | 4 ++--
>   arch/sh/mm/mmap.c                | 4 ++--
>   arch/sparc/kernel/sys_sparc_32.c | 2 +-
>   arch/sparc/kernel/sys_sparc_64.c | 4 ++--
>   arch/sparc/mm/hugetlbpage.c      | 4 ++--
>   arch/x86/kernel/sys_x86_64.c     | 4 ++--
>   arch/x86/mm/hugetlbpage.c        | 4 ++--
>   fs/hugetlbfs/inode.c             | 4 ++--
>   mm/mmap.c                        | 4 ++--
>   18 files changed, 29 insertions(+), 29 deletions(-)
> 
> diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
> index 5db88b627439..dd6801bb9240 100644
> --- a/arch/alpha/kernel/osf_sys.c
> +++ b/arch/alpha/kernel/osf_sys.c
> @@ -1218,7 +1218,7 @@ static unsigned long
>   arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
>   		         unsigned long limit)
>   {
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	info.flags = 0;
>   	info.length = len;
> diff --git a/arch/arc/mm/mmap.c b/arch/arc/mm/mmap.c
> index 3c1c7ae73292..6549b3375f54 100644
> --- a/arch/arc/mm/mmap.c
> +++ b/arch/arc/mm/mmap.c
> @@ -27,7 +27,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
>   {
>   	struct mm_struct *mm = current->mm;
>   	struct vm_area_struct *vma;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	/*
>   	 * We enforce the MAP_FIXED case.
> diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
> index a0f8a0ca0788..525795578c29 100644
> --- a/arch/arm/mm/mmap.c
> +++ b/arch/arm/mm/mmap.c
> @@ -34,7 +34,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
>   	struct vm_area_struct *vma;
>   	int do_align = 0;
>   	int aliasing = cache_is_vipt_aliasing();
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	/*
>   	 * We only need to do colour alignment if either the I or D
> @@ -87,7 +87,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
>   	unsigned long addr = addr0;
>   	int do_align = 0;
>   	int aliasing = cache_is_vipt_aliasing();
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	/*
>   	 * We only need to do colour alignment if either the I or D
> diff --git a/arch/csky/abiv1/mmap.c b/arch/csky/abiv1/mmap.c
> index 6792aca49999..726659d41fa9 100644
> --- a/arch/csky/abiv1/mmap.c
> +++ b/arch/csky/abiv1/mmap.c
> @@ -28,7 +28,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
>   	struct mm_struct *mm = current->mm;
>   	struct vm_area_struct *vma;
>   	int do_align = 0;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	/*
>   	 * We only need to do colour alignment if either the I or D
> diff --git a/arch/loongarch/mm/mmap.c b/arch/loongarch/mm/mmap.c
> index a9630a81b38a..664bf4abfdcf 100644
> --- a/arch/loongarch/mm/mmap.c
> +++ b/arch/loongarch/mm/mmap.c
> @@ -24,7 +24,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
>   	struct vm_area_struct *vma;
>   	unsigned long addr = addr0;
>   	int do_color_align;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	if (unlikely(len > TASK_SIZE))
>   		return -ENOMEM;
> diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
> index 00fe90c6db3e..6321b53dc995 100644
> --- a/arch/mips/mm/mmap.c
> +++ b/arch/mips/mm/mmap.c
> @@ -34,7 +34,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
>   	struct vm_area_struct *vma;
>   	unsigned long addr = addr0;
>   	int do_color_align;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	if (unlikely(len > TASK_SIZE))
>   		return -ENOMEM;
> diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
> index 98af719d5f85..e87c0e325abf 100644
> --- a/arch/parisc/kernel/sys_parisc.c
> +++ b/arch/parisc/kernel/sys_parisc.c
> @@ -104,7 +104,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
>   	struct vm_area_struct *vma, *prev;
>   	unsigned long filp_pgoff;
>   	int do_color_align;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	if (unlikely(len > TASK_SIZE))
>   		return -ENOMEM;
> diff --git a/arch/powerpc/mm/book3s64/slice.c b/arch/powerpc/mm/book3s64/slice.c
> index c0b58afb9a47..5884f384866f 100644
> --- a/arch/powerpc/mm/book3s64/slice.c
> +++ b/arch/powerpc/mm/book3s64/slice.c
> @@ -282,7 +282,7 @@ static unsigned long slice_find_area_bottomup(struct mm_struct *mm,
>   {
>   	int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
>   	unsigned long found, next_end;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	info.flags = 0;
>   	info.length = len;
> @@ -326,7 +326,7 @@ static unsigned long slice_find_area_topdown(struct mm_struct *mm,
>   {
>   	int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
>   	unsigned long found, prev;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   	unsigned long min_addr = max(PAGE_SIZE, mmap_min_addr);
>   
>   	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
> diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
> index c2d2850ec8d5..7f68485feea0 100644
> --- a/arch/s390/mm/hugetlbpage.c
> +++ b/arch/s390/mm/hugetlbpage.c
> @@ -258,7 +258,7 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
>   		unsigned long pgoff, unsigned long flags)
>   {
>   	struct hstate *h = hstate_file(file);
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	info.flags = 0;
>   	info.length = len;
> @@ -274,7 +274,7 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
>   		unsigned long pgoff, unsigned long flags)
>   {
>   	struct hstate *h = hstate_file(file);
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   	unsigned long addr;
>   
>   	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
> diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
> index cd52d72b59cf..df88496e2903 100644
> --- a/arch/s390/mm/mmap.c
> +++ b/arch/s390/mm/mmap.c
> @@ -77,7 +77,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
>   {
>   	struct mm_struct *mm = current->mm;
>   	struct vm_area_struct *vma;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	if (len > TASK_SIZE - mmap_min_addr)
>   		return -ENOMEM;
> @@ -116,7 +116,7 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp, unsigned long ad
>   {
>   	struct vm_area_struct *vma;
>   	struct mm_struct *mm = current->mm;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	/* requested length too big for entire address space */
>   	if (len > TASK_SIZE - mmap_min_addr)
> diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c
> index b82199878b45..6aee5f761e08 100644
> --- a/arch/sh/mm/mmap.c
> +++ b/arch/sh/mm/mmap.c
> @@ -57,7 +57,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
>   	struct mm_struct *mm = current->mm;
>   	struct vm_area_struct *vma;
>   	int do_colour_align;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	if (flags & MAP_FIXED) {
>   		/* We do not accept a shared mapping if it would violate
> @@ -106,7 +106,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
>   	struct mm_struct *mm = current->mm;
>   	unsigned long addr = addr0;
>   	int do_colour_align;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	if (flags & MAP_FIXED) {
>   		/* We do not accept a shared mapping if it would violate
> diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
> index 082a551897ed..7e781dbfd052 100644
> --- a/arch/sparc/kernel/sys_sparc_32.c
> +++ b/arch/sparc/kernel/sys_sparc_32.c
> @@ -41,7 +41,7 @@ SYSCALL_DEFINE0(getpagesize)
>   
>   unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
>   {
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	if (flags & MAP_FIXED) {
>   		/* We do not accept a shared mapping if it would violate
> diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
> index 1dbf7211666e..fc48ab3f83af 100644
> --- a/arch/sparc/kernel/sys_sparc_64.c
> +++ b/arch/sparc/kernel/sys_sparc_64.c
> @@ -93,7 +93,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
>   	struct vm_area_struct * vma;
>   	unsigned long task_size = TASK_SIZE;
>   	int do_color_align;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	if (flags & MAP_FIXED) {
>   		/* We do not accept a shared mapping if it would violate
> @@ -154,7 +154,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
>   	unsigned long task_size = STACK_TOP32;
>   	unsigned long addr = addr0;
>   	int do_color_align;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	/* This should only ever run for 32-bit processes.  */
>   	BUG_ON(!test_thread_flag(TIF_32BIT));
> diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
> index 38a1bef47efb..614e2c46d781 100644
> --- a/arch/sparc/mm/hugetlbpage.c
> +++ b/arch/sparc/mm/hugetlbpage.c
> @@ -31,7 +31,7 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
>   {
>   	struct hstate *h = hstate_file(filp);
>   	unsigned long task_size = TASK_SIZE;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	if (test_thread_flag(TIF_32BIT))
>   		task_size = STACK_TOP32;
> @@ -63,7 +63,7 @@ hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
>   	struct hstate *h = hstate_file(filp);
>   	struct mm_struct *mm = current->mm;
>   	unsigned long addr = addr0;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	/* This should only ever run for 32-bit processes.  */
>   	BUG_ON(!test_thread_flag(TIF_32BIT));
> diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c
> index c783aeb37dce..6e5d4fa5fc42 100644
> --- a/arch/x86/kernel/sys_x86_64.c
> +++ b/arch/x86/kernel/sys_x86_64.c
> @@ -125,7 +125,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
>   {
>   	struct mm_struct *mm = current->mm;
>   	struct vm_area_struct *vma;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   	unsigned long begin, end;
>   
>   	if (flags & MAP_FIXED)
> @@ -165,7 +165,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
>   	struct vm_area_struct *vma;
>   	struct mm_struct *mm = current->mm;
>   	unsigned long addr = addr0;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	/* requested length too big for entire address space */
>   	if (len > TASK_SIZE)
> diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
> index 6d77c0039617..88726bd1f72d 100644
> --- a/arch/x86/mm/hugetlbpage.c
> +++ b/arch/x86/mm/hugetlbpage.c
> @@ -51,7 +51,7 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
>   		unsigned long pgoff, unsigned long flags)
>   {
>   	struct hstate *h = hstate_file(file);
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	info.flags = 0;
>   	info.length = len;
> @@ -74,7 +74,7 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
>   		unsigned long pgoff, unsigned long flags)
>   {
>   	struct hstate *h = hstate_file(file);
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
>   	info.length = len;
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index a63d2eee086f..848b2239a215 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -165,7 +165,7 @@ hugetlb_get_unmapped_area_bottomup(struct file *file, unsigned long addr,
>   		unsigned long len, unsigned long pgoff, unsigned long flags)
>   {
>   	struct hstate *h = hstate_file(file);
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	info.flags = 0;
>   	info.length = len;
> @@ -181,7 +181,7 @@ hugetlb_get_unmapped_area_topdown(struct file *file, unsigned long addr,
>   		unsigned long len, unsigned long pgoff, unsigned long flags)
>   {
>   	struct hstate *h = hstate_file(file);
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   
>   	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
>   	info.length = len;
> diff --git a/mm/mmap.c b/mm/mmap.c
> index e02bb17fef5b..33af683a643f 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -1699,7 +1699,7 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr,
>   {
>   	struct mm_struct *mm = current->mm;
>   	struct vm_area_struct *vma, *prev;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
>   
>   	if (len > mmap_end - mmap_min_addr)
> @@ -1747,7 +1747,7 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
>   {
>   	struct vm_area_struct *vma, *prev;
>   	struct mm_struct *mm = current->mm;
> -	struct vm_unmapped_area_info info;
> +	struct vm_unmapped_area_info info = {};
>   	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
>   
>   	/* requested length too big for entire address space */

  reply	other threads:[~2024-02-27  7:03 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-26 19:09 [PATCH v2 0/9] Cover a guard gap corner case Rick Edgecombe
2024-02-26 19:09 ` [PATCH v2 1/9] mm: Switch mm->get_unmapped_area() to a flag Rick Edgecombe
2024-02-26 19:09 ` [PATCH v2 2/9] mm: Introduce arch_get_unmapped_area_vmflags() Rick Edgecombe
2024-02-26 19:09 ` [PATCH v2 3/9] mm: Use get_unmapped_area_vmflags() Rick Edgecombe
2024-02-26 19:09 ` [PATCH v2 4/9] thp: Add thp_get_unmapped_area_vmflags() Rick Edgecombe
2024-02-26 19:09 ` [PATCH v2 5/9] mm: Initialize struct vm_unmapped_area_info Rick Edgecombe
2024-02-27  7:02   ` Christophe Leroy [this message]
2024-02-27 15:00     ` Edgecombe, Rick P
2024-02-27 18:07     ` Kees Cook
2024-02-27 18:16       ` Christophe Leroy
2024-02-27 20:25         ` Edgecombe, Rick P
2024-02-28 13:22           ` Christophe Leroy
2024-02-28 17:01             ` Edgecombe, Rick P
2024-02-28 23:10               ` Christophe Leroy
2024-02-28 17:21             ` Kees Cook
2024-03-02  0:47               ` Edgecombe, Rick P
2024-03-02  1:51                 ` Kees Cook
2024-03-04 18:00                   ` Christophe Leroy
2024-03-04 18:03                     ` Edgecombe, Rick P
2024-02-28 11:51   ` Kirill A. Shutemov
     [not found]   ` <20240302001714.674091-1-rick.p.edgecombe@intel.com>
2024-03-02  0:17     ` [RFC v2.1 12/12] hugetlbfs: Use initializer for " Rick Edgecombe
2024-02-26 19:09 ` [PATCH v2 6/9] mm: Take placement mappings gap into account Rick Edgecombe
2024-02-26 19:09 ` [PATCH v2 7/9] x86/mm: Implement HAVE_ARCH_UNMAPPED_AREA_VMFLAGS Rick Edgecombe
2024-02-26 19:09 ` [PATCH v2 8/9] x86/mm: Care about shadow stack guard gap during placement Rick Edgecombe
2024-02-26 19:09 ` [PATCH v2 9/9] selftests/x86: Add placement guard gap test for shstk Rick Edgecombe

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