[PATCH] mm: thp: Replace HTTP links with HTTPS ones

[PATCH] mm: thp: Replace HTTP links with HTTPS ones

[Alexander A. Klimov]

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
            If both the HTTP and HTTPS versions
            return 200 OK and serve the same content:
              Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
---
 Continuing my work started at 93431e0607e5.
 See also: git log --oneline '--author=Alexander A. Klimov <grandmaster@al2klimov.de>' v5.7..master
 (Actually letting a shell for loop submit all this stuff for me.)

 If there are any URLs to be removed completely or at least not just HTTPSified:
 Just clearly say so and I'll *undo my change*.
 See also: https://lkml.org/lkml/2020/6/27/64

 If there are any valid, but yet not changed URLs:
 See: https://lkml.org/lkml/2020/6/26/837

 If you apply the patch, please let me know.

 Sorry again to all maintainers who complained about subject lines.
 Now I realized that you want an actually perfect prefixes,
 not just subsystem ones.
 I tried my best...
 And yes, *I could* (at least half-)automate it.
 Impossible is nothing! :)


 mm/huge_memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 78c84bee7e29..9e4b78cf73ab 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2069,7 +2069,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
 	 * free), userland could trigger a small page size TLB miss on the
 	 * small sized TLB while the hugepage TLB entry is still established in
 	 * the huge TLB. Some CPU doesn't like that.
-	 * See http://support.amd.com/us/Processor_TechDocs/41322.pdf, Erratum
+	 * See https://support.amd.com/us/Processor_TechDocs/41322.pdf, Erratum
 	 * 383 on page 93. Intel should be safe but is also warns that it's
 	 * only safe if the permission and cache attributes of the two entries
 	 * loaded in the two TLB is identical (which should be the case here).
-- 
2.27.0

Re: [PATCH] mm: thp: Replace HTTP links with HTTPS ones

[Vlastimil Babka]

On 7/13/20 6:43 PM, Alexander A. Klimov wrote:
> Rationale:
> Reduces attack surface on kernel devs opening the links for MITM
> as HTTPS traffic is much harder to manipulate.
> 
> Deterministic algorithm:
> For each file:
>   If not .svg:
>     For each line:
>       If doesn't contain `\bxmlns\b`:
>         For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
> 	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
>             If both the HTTP and HTTPS versions
>             return 200 OK and serve the same content:
>               Replace HTTP with HTTPS.
> 
> Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
> ---
>  Continuing my work started at 93431e0607e5.
>  See also: git log --oneline '--author=Alexander A. Klimov <grandmaster@al2klimov.de>' v5.7..master
>  (Actually letting a shell for loop submit all this stuff for me.)
> 
>  If there are any URLs to be removed completely or at least not just HTTPSified:
>  Just clearly say so and I'll *undo my change*.
>  See also: https://lkml.org/lkml/2020/6/27/64
> 
>  If there are any valid, but yet not changed URLs:
>  See: https://lkml.org/lkml/2020/6/26/837
> 
>  If you apply the patch, please let me know.
> 
>  Sorry again to all maintainers who complained about subject lines.
>  Now I realized that you want an actually perfect prefixes,
>  not just subsystem ones.
>  I tried my best...
>  And yes, *I could* (at least half-)automate it.
>  Impossible is nothing! :)
> 
> 
>  mm/huge_memory.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 78c84bee7e29..9e4b78cf73ab 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -2069,7 +2069,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
>  	 * free), userland could trigger a small page size TLB miss on the
>  	 * small sized TLB while the hugepage TLB entry is still established in
>  	 * the huge TLB. Some CPU doesn't like that.
> -	 * See http://support.amd.com/us/Processor_TechDocs/41322.pdf, Erratum
> +	 * See https://support.amd.com/us/Processor_TechDocs/41322.pdf, Erratum
>  	 * 383 on page 93. Intel should be safe but is also warns that it's

Well, it was a good opportunity to find out that the link doesn't work anyway.
The pdf seems to be now at
http://support.amd.com/TechDocs/41322_10h_Rev_Gd.pdf
and the erratum is on page 105

>  	 * only safe if the permission and cache attributes of the two entries
>  	 * loaded in the two TLB is identical (which should be the case here).
> 

Re: [PATCH] mm: thp: Replace HTTP links with HTTPS ones

[Andrew Morton]

On Tue, 14 Jul 2020 11:41:37 +0200 Vlastimil Babka <vbabka@suse.cz> wrote:

> > --- a/mm/huge_memory.c
> > +++ b/mm/huge_memory.c
> > @@ -2069,7 +2069,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
> >  	 * free), userland could trigger a small page size TLB miss on the
> >  	 * small sized TLB while the hugepage TLB entry is still established in
> >  	 * the huge TLB. Some CPU doesn't like that.
> > -	 * See http://support.amd.com/us/Processor_TechDocs/41322.pdf, Erratum
> > +	 * See https://support.amd.com/us/Processor_TechDocs/41322.pdf, Erratum
> >  	 * 383 on page 93. Intel should be safe but is also warns that it's
> 
> Well, it was a good opportunity to find out that the link doesn't work anyway.
> The pdf seems to be now at
> http://support.amd.com/TechDocs/41322_10h_Rev_Gd.pdf
> and the erratum is on page 105

Thanks.

From: Andrew Morton <akpm@linux-foundation.org>
Subject: mm-thp-replace-http-links-with-https-ones-fix

fix amd.com URL, per Vlastimil

Cc: "Alexander A. Klimov" <grandmaster@al2klimov.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/huge_memory.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/huge_memory.c~mm-thp-replace-http-links-with-https-ones-fix
+++ a/mm/huge_memory.c
@@ -2065,8 +2065,8 @@ static void __split_huge_pmd_locked(stru
 	 * free), userland could trigger a small page size TLB miss on the
 	 * small sized TLB while the hugepage TLB entry is still established in
 	 * the huge TLB. Some CPU doesn't like that.
-	 * See https://support.amd.com/us/Processor_TechDocs/41322.pdf, Erratum
-	 * 383 on page 93. Intel should be safe but is also warns that it's
+	 * See http://support.amd.com/TechDocs/41322_10h_Rev_Gd.pdf, Erratum
+	 * 383 on page 105. Intel should be safe but is also warns that it's
 	 * only safe if the permission and cache attributes of the two entries
 	 * loaded in the two TLB is identical (which should be the case here).
 	 * But it is generally safer to never allow small and huge TLB entries
_