[PATCH v3 0/2] Improve KASAN_VMALLOC support

[PATCH v3 0/2] Improve KASAN_VMALLOC support

[Alexandre Ghiti]

This patchset improves KASAN vmalloc implementation by fixing an
oversight where kernel page table was not flushed in patch 1 and by
reworking the kernel page table PGD level population in patch 2.

Changes in v3:
- Split into 2 patches
- Add reviewed-by

Changes in v2:
- Quiet kernel test robot warnings about missing prototypes by declaring
  the introduced functions as static.

Alexandre Ghiti (2):
  riscv: Ensure page table writes are flushed when initializing KASAN
    vmalloc
  riscv: Cleanup KASAN_VMALLOC support

 arch/riscv/mm/kasan_init.c | 61 +++++++++++++-------------------------
 1 file changed, 20 insertions(+), 41 deletions(-)

-- 
2.20.1


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[PATCH v3 1/2] riscv: Ensure page table writes are flushed when initializing KASAN vmalloc

[Alexandre Ghiti]

Make sure that writes to kernel page table during KASAN vmalloc
initialization are made visible by adding a sfence.vma.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
---
 arch/riscv/mm/kasan_init.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index 1b968855d389..57bf4ae09361 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@ -187,6 +187,8 @@ void __init kasan_shallow_populate(void *start, void *end)
 		}
 		vaddr += PAGE_SIZE;
 	}
+
+	local_flush_tlb_all();
 }
 
 void __init kasan_init(void)
-- 
2.20.1


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[PATCH v3 2/2] riscv: Cleanup KASAN_VMALLOC support

[Alexandre Ghiti]

When KASAN vmalloc region is populated, there is no userspace process and
the page table in use is swapper_pg_dir, so there is no need to read
SATP. Then we can use the same scheme used by kasan_populate_p*d
functions to go through the page table, which harmonizes the code.

In addition, make use of set_pgd that goes through all unused page table
levels, contrary to p*d_populate functions, which makes this function work
whatever the number of page table levels.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
---
 arch/riscv/mm/kasan_init.c | 59 ++++++++++++--------------------------
 1 file changed, 18 insertions(+), 41 deletions(-)

diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index 57bf4ae09361..c16178918239 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@ -11,18 +11,6 @@
 #include <asm/fixmap.h>
 #include <asm/pgalloc.h>
 
-static __init void *early_alloc(size_t size, int node)
-{
-	void *ptr = memblock_alloc_try_nid(size, size,
-		__pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, node);
-
-	if (!ptr)
-		panic("%pS: Failed to allocate %zu bytes align=%zx nid=%d from=%llx\n",
-			__func__, size, size, node, (u64)__pa(MAX_DMA_ADDRESS));
-
-	return ptr;
-}
-
 extern pgd_t early_pg_dir[PTRS_PER_PGD];
 asmlinkage void __init kasan_early_init(void)
 {
@@ -155,38 +143,27 @@ static void __init kasan_populate(void *start, void *end)
 	memset(start, KASAN_SHADOW_INIT, end - start);
 }
 
-void __init kasan_shallow_populate(void *start, void *end)
+static void __init kasan_shallow_populate_pgd(unsigned long vaddr, unsigned long end)
 {
-	unsigned long vaddr = (unsigned long)start & PAGE_MASK;
-	unsigned long vend = PAGE_ALIGN((unsigned long)end);
-	unsigned long pfn;
-	int index;
+	unsigned long next;
 	void *p;
-	pud_t *pud_dir, *pud_k;
-	pgd_t *pgd_dir, *pgd_k;
-	p4d_t *p4d_dir, *p4d_k;
-
-	while (vaddr < vend) {
-		index = pgd_index(vaddr);
-		pfn = csr_read(CSR_SATP) & SATP_PPN;
-		pgd_dir = (pgd_t *)pfn_to_virt(pfn) + index;
-		pgd_k = init_mm.pgd + index;
-		pgd_dir = pgd_offset_k(vaddr);
-		set_pgd(pgd_dir, *pgd_k);
-
-		p4d_dir = p4d_offset(pgd_dir, vaddr);
-		p4d_k  = p4d_offset(pgd_k, vaddr);
-
-		vaddr = (vaddr + PUD_SIZE) & PUD_MASK;
-		pud_dir = pud_offset(p4d_dir, vaddr);
-		pud_k = pud_offset(p4d_k, vaddr);
-
-		if (pud_present(*pud_dir)) {
-			p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
-			pud_populate(&init_mm, pud_dir, p);
+	pgd_t *pgd_k = pgd_offset_k(vaddr);
+
+	do {
+		next = pgd_addr_end(vaddr, end);
+		if (pgd_page_vaddr(*pgd_k) == (unsigned long)lm_alias(kasan_early_shadow_pmd)) {
+			p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+			set_pgd(pgd_k, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE));
 		}
-		vaddr += PAGE_SIZE;
-	}
+	} while (pgd_k++, vaddr = next, vaddr != end);
+}
+
+static void __init kasan_shallow_populate(void *start, void *end)
+{
+	unsigned long vaddr = (unsigned long)start & PAGE_MASK;
+	unsigned long vend = PAGE_ALIGN((unsigned long)end);
+
+	kasan_shallow_populate_pgd(vaddr, vend);
 
 	local_flush_tlb_all();
 }
-- 
2.20.1


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Re: [PATCH v3 1/2] riscv: Ensure page table writes are flushed when initializing KASAN vmalloc

[Palmer Dabbelt]

On Sat, 13 Mar 2021 00:45:04 PST (-0800), alex@ghiti.fr wrote:
> Make sure that writes to kernel page table during KASAN vmalloc
> initialization are made visible by adding a sfence.vma.
>
> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
> Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
> ---
>  arch/riscv/mm/kasan_init.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
> index 1b968855d389..57bf4ae09361 100644
> --- a/arch/riscv/mm/kasan_init.c
> +++ b/arch/riscv/mm/kasan_init.c
> @@ -187,6 +187,8 @@ void __init kasan_shallow_populate(void *start, void *end)
>  		}
>  		vaddr += PAGE_SIZE;
>  	}
> +
> +	local_flush_tlb_all();
>  }
>
>  void __init kasan_init(void)

Thanks, this is on fixes.

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Re: [PATCH v3 2/2] riscv: Cleanup KASAN_VMALLOC support

[Palmer Dabbelt]

On Sat, 13 Mar 2021 00:45:05 PST (-0800), alex@ghiti.fr wrote:
> When KASAN vmalloc region is populated, there is no userspace process and
> the page table in use is swapper_pg_dir, so there is no need to read
> SATP. Then we can use the same scheme used by kasan_populate_p*d
> functions to go through the page table, which harmonizes the code.
>
> In addition, make use of set_pgd that goes through all unused page table
> levels, contrary to p*d_populate functions, which makes this function work
> whatever the number of page table levels.
>
> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
> Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
> ---
>  arch/riscv/mm/kasan_init.c | 59 ++++++++++++--------------------------
>  1 file changed, 18 insertions(+), 41 deletions(-)
>
> diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
> index 57bf4ae09361..c16178918239 100644
> --- a/arch/riscv/mm/kasan_init.c
> +++ b/arch/riscv/mm/kasan_init.c
> @@ -11,18 +11,6 @@
>  #include <asm/fixmap.h>
>  #include <asm/pgalloc.h>
>
> -static __init void *early_alloc(size_t size, int node)
> -{
> -	void *ptr = memblock_alloc_try_nid(size, size,
> -		__pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, node);
> -
> -	if (!ptr)
> -		panic("%pS: Failed to allocate %zu bytes align=%zx nid=%d from=%llx\n",
> -			__func__, size, size, node, (u64)__pa(MAX_DMA_ADDRESS));
> -
> -	return ptr;
> -}
> -
>  extern pgd_t early_pg_dir[PTRS_PER_PGD];
>  asmlinkage void __init kasan_early_init(void)
>  {
> @@ -155,38 +143,27 @@ static void __init kasan_populate(void *start, void *end)
>  	memset(start, KASAN_SHADOW_INIT, end - start);
>  }
>
> -void __init kasan_shallow_populate(void *start, void *end)
> +static void __init kasan_shallow_populate_pgd(unsigned long vaddr, unsigned long end)
>  {
> -	unsigned long vaddr = (unsigned long)start & PAGE_MASK;
> -	unsigned long vend = PAGE_ALIGN((unsigned long)end);
> -	unsigned long pfn;
> -	int index;
> +	unsigned long next;
>  	void *p;
> -	pud_t *pud_dir, *pud_k;
> -	pgd_t *pgd_dir, *pgd_k;
> -	p4d_t *p4d_dir, *p4d_k;
> -
> -	while (vaddr < vend) {
> -		index = pgd_index(vaddr);
> -		pfn = csr_read(CSR_SATP) & SATP_PPN;
> -		pgd_dir = (pgd_t *)pfn_to_virt(pfn) + index;
> -		pgd_k = init_mm.pgd + index;
> -		pgd_dir = pgd_offset_k(vaddr);
> -		set_pgd(pgd_dir, *pgd_k);
> -
> -		p4d_dir = p4d_offset(pgd_dir, vaddr);
> -		p4d_k  = p4d_offset(pgd_k, vaddr);
> -
> -		vaddr = (vaddr + PUD_SIZE) & PUD_MASK;
> -		pud_dir = pud_offset(p4d_dir, vaddr);
> -		pud_k = pud_offset(p4d_k, vaddr);
> -
> -		if (pud_present(*pud_dir)) {
> -			p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
> -			pud_populate(&init_mm, pud_dir, p);
> +	pgd_t *pgd_k = pgd_offset_k(vaddr);
> +
> +	do {
> +		next = pgd_addr_end(vaddr, end);
> +		if (pgd_page_vaddr(*pgd_k) == (unsigned long)lm_alias(kasan_early_shadow_pmd)) {
> +			p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
> +			set_pgd(pgd_k, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE));
>  		}
> -		vaddr += PAGE_SIZE;
> -	}
> +	} while (pgd_k++, vaddr = next, vaddr != end);
> +}
> +
> +static void __init kasan_shallow_populate(void *start, void *end)
> +{
> +	unsigned long vaddr = (unsigned long)start & PAGE_MASK;
> +	unsigned long vend = PAGE_ALIGN((unsigned long)end);
> +
> +	kasan_shallow_populate_pgd(vaddr, vend);
>
>  	local_flush_tlb_all();
>  }

Thanks, this is on for-next.

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Re: [PATCH v3 2/2] riscv: Cleanup KASAN_VMALLOC support

[Geert Uytterhoeven]

Hi Palmer,

On Tue, Mar 30, 2021 at 7:08 AM Palmer Dabbelt <palmer@dabbelt.com> wrote:
> On Sat, 13 Mar 2021 00:45:05 PST (-0800), alex@ghiti.fr wrote:
> > When KASAN vmalloc region is populated, there is no userspace process and
> > the page table in use is swapper_pg_dir, so there is no need to read
> > SATP. Then we can use the same scheme used by kasan_populate_p*d
> > functions to go through the page table, which harmonizes the code.
> >
> > In addition, make use of set_pgd that goes through all unused page table
> > levels, contrary to p*d_populate functions, which makes this function work
> > whatever the number of page table levels.
> >
> > Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
> > Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
> > ---
> >  arch/riscv/mm/kasan_init.c | 59 ++++++++++++--------------------------
> >  1 file changed, 18 insertions(+), 41 deletions(-)
> >
> > diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
> > index 57bf4ae09361..c16178918239 100644
> > --- a/arch/riscv/mm/kasan_init.c
> > +++ b/arch/riscv/mm/kasan_init.c
> > @@ -11,18 +11,6 @@
> >  #include <asm/fixmap.h>
> >  #include <asm/pgalloc.h>
> >
> > -static __init void *early_alloc(size_t size, int node)
> > -{
> > -     void *ptr = memblock_alloc_try_nid(size, size,
> > -             __pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, node);
> > -
> > -     if (!ptr)
> > -             panic("%pS: Failed to allocate %zu bytes align=%zx nid=%d from=%llx\n",
> > -                     __func__, size, size, node, (u64)__pa(MAX_DMA_ADDRESS));
> > -
> > -     return ptr;
> > -}
> > -
> >  extern pgd_t early_pg_dir[PTRS_PER_PGD];
> >  asmlinkage void __init kasan_early_init(void)
> >  {
> > @@ -155,38 +143,27 @@ static void __init kasan_populate(void *start, void *end)
> >       memset(start, KASAN_SHADOW_INIT, end - start);
> >  }
> >
> > -void __init kasan_shallow_populate(void *start, void *end)
> > +static void __init kasan_shallow_populate_pgd(unsigned long vaddr, unsigned long end)
> >  {
> > -     unsigned long vaddr = (unsigned long)start & PAGE_MASK;
> > -     unsigned long vend = PAGE_ALIGN((unsigned long)end);
> > -     unsigned long pfn;
> > -     int index;
> > +     unsigned long next;
> >       void *p;
> > -     pud_t *pud_dir, *pud_k;
> > -     pgd_t *pgd_dir, *pgd_k;
> > -     p4d_t *p4d_dir, *p4d_k;
> > -
> > -     while (vaddr < vend) {
> > -             index = pgd_index(vaddr);
> > -             pfn = csr_read(CSR_SATP) & SATP_PPN;
> > -             pgd_dir = (pgd_t *)pfn_to_virt(pfn) + index;
> > -             pgd_k = init_mm.pgd + index;
> > -             pgd_dir = pgd_offset_k(vaddr);
> > -             set_pgd(pgd_dir, *pgd_k);
> > -
> > -             p4d_dir = p4d_offset(pgd_dir, vaddr);
> > -             p4d_k  = p4d_offset(pgd_k, vaddr);
> > -
> > -             vaddr = (vaddr + PUD_SIZE) & PUD_MASK;
> > -             pud_dir = pud_offset(p4d_dir, vaddr);
> > -             pud_k = pud_offset(p4d_k, vaddr);
> > -
> > -             if (pud_present(*pud_dir)) {
> > -                     p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
> > -                     pud_populate(&init_mm, pud_dir, p);
> > +     pgd_t *pgd_k = pgd_offset_k(vaddr);
> > +
> > +     do {
> > +             next = pgd_addr_end(vaddr, end);
> > +             if (pgd_page_vaddr(*pgd_k) == (unsigned long)lm_alias(kasan_early_shadow_pmd)) {
> > +                     p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
> > +                     set_pgd(pgd_k, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE));
> >               }
> > -             vaddr += PAGE_SIZE;
> > -     }
> > +     } while (pgd_k++, vaddr = next, vaddr != end);
> > +}
> > +
> > +static void __init kasan_shallow_populate(void *start, void *end)
> > +{
> > +     unsigned long vaddr = (unsigned long)start & PAGE_MASK;
> > +     unsigned long vend = PAGE_ALIGN((unsigned long)end);
> > +
> > +     kasan_shallow_populate_pgd(vaddr, vend);
> >
> >       local_flush_tlb_all();
> >  }
>
> Thanks, this is on for-next.

Your for-next does not include your fixes branch, hence they now conflict,
and for-next lacks the local_flush_tlb_all().

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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Re: [PATCH v3 2/2] riscv: Cleanup KASAN_VMALLOC support

[Palmer Dabbelt]

On Tue, 30 Mar 2021 02:47:30 PDT (-0700), geert@linux-m68k.org wrote:
> Hi Palmer,
>
> On Tue, Mar 30, 2021 at 7:08 AM Palmer Dabbelt <palmer@dabbelt.com> wrote:
>> On Sat, 13 Mar 2021 00:45:05 PST (-0800), alex@ghiti.fr wrote:
>> > When KASAN vmalloc region is populated, there is no userspace process and
>> > the page table in use is swapper_pg_dir, so there is no need to read
>> > SATP. Then we can use the same scheme used by kasan_populate_p*d
>> > functions to go through the page table, which harmonizes the code.
>> >
>> > In addition, make use of set_pgd that goes through all unused page table
>> > levels, contrary to p*d_populate functions, which makes this function work
>> > whatever the number of page table levels.
>> >
>> > Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
>> > Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
>> > ---
>> >  arch/riscv/mm/kasan_init.c | 59 ++++++++++++--------------------------
>> >  1 file changed, 18 insertions(+), 41 deletions(-)
>> >
>> > diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
>> > index 57bf4ae09361..c16178918239 100644
>> > --- a/arch/riscv/mm/kasan_init.c
>> > +++ b/arch/riscv/mm/kasan_init.c
>> > @@ -11,18 +11,6 @@
>> >  #include <asm/fixmap.h>
>> >  #include <asm/pgalloc.h>
>> >
>> > -static __init void *early_alloc(size_t size, int node)
>> > -{
>> > -     void *ptr = memblock_alloc_try_nid(size, size,
>> > -             __pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, node);
>> > -
>> > -     if (!ptr)
>> > -             panic("%pS: Failed to allocate %zu bytes align=%zx nid=%d from=%llx\n",
>> > -                     __func__, size, size, node, (u64)__pa(MAX_DMA_ADDRESS));
>> > -
>> > -     return ptr;
>> > -}
>> > -
>> >  extern pgd_t early_pg_dir[PTRS_PER_PGD];
>> >  asmlinkage void __init kasan_early_init(void)
>> >  {
>> > @@ -155,38 +143,27 @@ static void __init kasan_populate(void *start, void *end)
>> >       memset(start, KASAN_SHADOW_INIT, end - start);
>> >  }
>> >
>> > -void __init kasan_shallow_populate(void *start, void *end)
>> > +static void __init kasan_shallow_populate_pgd(unsigned long vaddr, unsigned long end)
>> >  {
>> > -     unsigned long vaddr = (unsigned long)start & PAGE_MASK;
>> > -     unsigned long vend = PAGE_ALIGN((unsigned long)end);
>> > -     unsigned long pfn;
>> > -     int index;
>> > +     unsigned long next;
>> >       void *p;
>> > -     pud_t *pud_dir, *pud_k;
>> > -     pgd_t *pgd_dir, *pgd_k;
>> > -     p4d_t *p4d_dir, *p4d_k;
>> > -
>> > -     while (vaddr < vend) {
>> > -             index = pgd_index(vaddr);
>> > -             pfn = csr_read(CSR_SATP) & SATP_PPN;
>> > -             pgd_dir = (pgd_t *)pfn_to_virt(pfn) + index;
>> > -             pgd_k = init_mm.pgd + index;
>> > -             pgd_dir = pgd_offset_k(vaddr);
>> > -             set_pgd(pgd_dir, *pgd_k);
>> > -
>> > -             p4d_dir = p4d_offset(pgd_dir, vaddr);
>> > -             p4d_k  = p4d_offset(pgd_k, vaddr);
>> > -
>> > -             vaddr = (vaddr + PUD_SIZE) & PUD_MASK;
>> > -             pud_dir = pud_offset(p4d_dir, vaddr);
>> > -             pud_k = pud_offset(p4d_k, vaddr);
>> > -
>> > -             if (pud_present(*pud_dir)) {
>> > -                     p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
>> > -                     pud_populate(&init_mm, pud_dir, p);
>> > +     pgd_t *pgd_k = pgd_offset_k(vaddr);
>> > +
>> > +     do {
>> > +             next = pgd_addr_end(vaddr, end);
>> > +             if (pgd_page_vaddr(*pgd_k) == (unsigned long)lm_alias(kasan_early_shadow_pmd)) {
>> > +                     p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
>> > +                     set_pgd(pgd_k, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE));
>> >               }
>> > -             vaddr += PAGE_SIZE;
>> > -     }
>> > +     } while (pgd_k++, vaddr = next, vaddr != end);
>> > +}
>> > +
>> > +static void __init kasan_shallow_populate(void *start, void *end)
>> > +{
>> > +     unsigned long vaddr = (unsigned long)start & PAGE_MASK;
>> > +     unsigned long vend = PAGE_ALIGN((unsigned long)end);
>> > +
>> > +     kasan_shallow_populate_pgd(vaddr, vend);
>> >
>> >       local_flush_tlb_all();
>> >  }
>>
>> Thanks, this is on for-next.
>
> Your for-next does not include your fixes branch, hence they now conflict,
> and for-next lacks the local_flush_tlb_all().

This came up before and I don't think we ever sorted out what the right 
thing to do is.  Right now I'm keeping for-next pinned an at early RC, 
but fast-forwarding fixes to the latest RC every time I sent a PR.  I 
don't have fixes merged back into for-next because I don't want those 
merges to show up when I send my merge window PRs.

For this one I purposefully left out the local_flush_tlb_all() whene I 
pulled in this patch, and was planning on fixing it up along with any 
other merge conflicts when I send along the PR.  It does all seem like a 
bit of a song and dance here, though, so I'm open to suggestions as to 
how to run this better -- though last time I went through that exercise 
it seemed like everyone had their own way of doing it, they all had a 
different set of issues, and I was at least familiar with this flavor of 
craziness.

I was kind of tempted to convert for-next over into a branch that only 
contains merges, though, which would make it a bit easier to merge fixes 
in.

>
> Gr{oetje,eeting}s,
>
>                         Geert

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