* Re: [PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user()
@ 2020-05-31 18:43 ` Markus Elfring
0 siblings, 0 replies; 9+ messages in thread
From: Markus Elfring @ 2020-05-31 18:43 UTC (permalink / raw)
To: Denis Efremov, Gilles Muller, Julia Lawall, Masahiro Yamada,
Michal Marek, Nicolas Palix, Coccinelle
Cc: kernel-janitors, linux-kernel, Joe Perches
> Add vmemdup_user() transformations to the memdup_user.cocci rule.
> Commit 50fd2f298bef ("new primitive: vmemdup_user()") introduced
> vmemdup_user(). The function uses kvmalloc with GPF_USER flag.
Such a software evolution is also interesting.
> +@depends on patch@
> +- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
> ++ to = vmemdup_user(from,size);
How do you think about to achieve the desired data processing by the application
of a SmPL disjunction like the following?
to =
(
- \( kmalloc \| kzalloc \) (size, \( GFP_KERNEL \| GFP_USER \))
+ memdup_user(from, size)
|
- \( kvmalloc \| kvzalloc \) (size, \( GFP_KERNEL \| GFP_USER \))
+ vmemdup_user(from, size)
)
;
Unfortunately, the Coccinelle software does not like the following
SmPL code variant so far.
to =
(
- \( kmalloc \| kzalloc \)
+ memdup_user
|
- \( kvmalloc \| kvzalloc \)
+ vmemdup_user
)
(
- size, \( GFP_KERNEL \| GFP_USER \)
+ from, size
);
Message:
25: no available token to attach to
Regards,
Markus
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [Cocci] [PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user()
@ 2020-05-31 18:43 ` Markus Elfring
0 siblings, 0 replies; 9+ messages in thread
From: Markus Elfring @ 2020-05-31 18:43 UTC (permalink / raw)
To: Denis Efremov, Gilles Muller, Julia Lawall, Masahiro Yamada,
Michal Marek, Nicolas Palix, Coccinelle
Cc: Joe Perches, kernel-janitors, linux-kernel
> Add vmemdup_user() transformations to the memdup_user.cocci rule.
> Commit 50fd2f298bef ("new primitive: vmemdup_user()") introduced
> vmemdup_user(). The function uses kvmalloc with GPF_USER flag.
Such a software evolution is also interesting.
> +@depends on patch@
> +- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
> ++ to = vmemdup_user(from,size);
How do you think about to achieve the desired data processing by the application
of a SmPL disjunction like the following?
to =
(
- \( kmalloc \| kzalloc \) (size, \( GFP_KERNEL \| GFP_USER \))
+ memdup_user(from, size)
|
- \( kvmalloc \| kvzalloc \) (size, \( GFP_KERNEL \| GFP_USER \))
+ vmemdup_user(from, size)
)
;
Unfortunately, the Coccinelle software does not like the following
SmPL code variant so far.
to =
(
- \( kmalloc \| kzalloc \)
+ memdup_user
|
- \( kvmalloc \| kvzalloc \)
+ vmemdup_user
)
(
- size, \( GFP_KERNEL \| GFP_USER \)
+ from, size
);
Message:
25: no available token to attach to
Regards,
Markus
_______________________________________________
Cocci mailing list
Cocci@systeme.lip6.fr
https://systeme.lip6.fr/mailman/listinfo/cocci
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user()
@ 2020-05-31 18:43 ` Markus Elfring
0 siblings, 0 replies; 9+ messages in thread
From: Markus Elfring @ 2020-05-31 18:43 UTC (permalink / raw)
To: Denis Efremov, Gilles Muller, Julia Lawall, Masahiro Yamada,
Michal Marek, Nicolas Palix, Coccinelle
Cc: Joe Perches, kernel-janitors, linux-kernel
> Add vmemdup_user() transformations to the memdup_user.cocci rule.
> Commit 50fd2f298bef ("new primitive: vmemdup_user()") introduced
> vmemdup_user(). The function uses kvmalloc with GPF_USER flag.
Such a software evolution is also interesting.
> +@depends on patch@
> +- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
> ++ to = vmemdup_user(from,size);
How do you think about to achieve the desired data processing by the application
of a SmPL disjunction like the following?
to (
- \( kmalloc \| kzalloc \) (size, \( GFP_KERNEL \| GFP_USER \))
+ memdup_user(from, size)
|
- \( kvmalloc \| kvzalloc \) (size, \( GFP_KERNEL \| GFP_USER \))
+ vmemdup_user(from, size)
)
;
Unfortunately, the Coccinelle software does not like the following
SmPL code variant so far.
to (
- \( kmalloc \| kzalloc \)
+ memdup_user
|
- \( kvmalloc \| kvzalloc \)
+ vmemdup_user
)
(
- size, \( GFP_KERNEL \| GFP_USER \)
+ from, size
);
Message:
25: no available token to attach to
Regards,
Markus
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [2/2] Coccinelle: memdup_user: Extending data processing for special tokens
2020-05-31 18:43 ` Markus Elfring
(?)
@ 2020-06-01 5:47 ` Markus Elfring
-1 siblings, 0 replies; 9+ messages in thread
From: Markus Elfring @ 2020-06-01 5:47 UTC (permalink / raw)
To: Denis Efremov, Gilles Muller, Julia Lawall, Masahiro Yamada,
Michal Marek, Nicolas Palix, Coccinelle
Cc: kernel-janitors, linux-kernel, Joe Perches
> Unfortunately, the Coccinelle software does not like the following
> SmPL code variant so far.
>
> to =
> (
> - \( kmalloc \| kzalloc \)
> + memdup_user
> |
> - \( kvmalloc \| kvzalloc \)
> + vmemdup_user
> )
> (
> - size, \( GFP_KERNEL \| GFP_USER \)
> + from, size
> );
>
>
> Message:
> 25: no available token to attach to
I have adjusted a bit of OCaml source code.
Thus I could see where such information was provided.
https://github.com/coccinelle/coccinelle/blob/7cf2c23e64066d5249a64a316cc5347831f7a63f/parsing_cocci/insert_plus.ml#L1041
…
| (((infop,count,pcode) as p) :: ps) as all ->
(* …
modifications. for the moment, we thus give an error, asking the
user to rewrite the semantic patch. *)
if greater_than_end infop infom1 || is_minus m1 || !empty_isos
…
Will the referenced comment get any more software development attention?
Regards,
Markus
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [Cocci] [2/2] Coccinelle: memdup_user: Extending data processing for special tokens
@ 2020-06-01 5:47 ` Markus Elfring
0 siblings, 0 replies; 9+ messages in thread
From: Markus Elfring @ 2020-06-01 5:47 UTC (permalink / raw)
To: Denis Efremov, Gilles Muller, Julia Lawall, Masahiro Yamada,
Michal Marek, Nicolas Palix, Coccinelle
Cc: Joe Perches, kernel-janitors, linux-kernel
> Unfortunately, the Coccinelle software does not like the following
> SmPL code variant so far.
>
> to =
> (
> - \( kmalloc \| kzalloc \)
> + memdup_user
> |
> - \( kvmalloc \| kvzalloc \)
> + vmemdup_user
> )
> (
> - size, \( GFP_KERNEL \| GFP_USER \)
> + from, size
> );
>
>
> Message:
> 25: no available token to attach to
I have adjusted a bit of OCaml source code.
Thus I could see where such information was provided.
https://github.com/coccinelle/coccinelle/blob/7cf2c23e64066d5249a64a316cc5347831f7a63f/parsing_cocci/insert_plus.ml#L1041
…
| (((infop,count,pcode) as p) :: ps) as all ->
(* …
modifications. for the moment, we thus give an error, asking the
user to rewrite the semantic patch. *)
if greater_than_end infop infom1 || is_minus m1 || !empty_isos
…
Will the referenced comment get any more software development attention?
Regards,
Markus
_______________________________________________
Cocci mailing list
Cocci@systeme.lip6.fr
https://systeme.lip6.fr/mailman/listinfo/cocci
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [2/2] Coccinelle: memdup_user: Extending data processing for special tokens
@ 2020-06-01 5:47 ` Markus Elfring
0 siblings, 0 replies; 9+ messages in thread
From: Markus Elfring @ 2020-06-01 5:47 UTC (permalink / raw)
To: Denis Efremov, Gilles Muller, Julia Lawall, Masahiro Yamada,
Michal Marek, Nicolas Palix, Coccinelle
Cc: Joe Perches, kernel-janitors, linux-kernel
> Unfortunately, the Coccinelle software does not like the following
> SmPL code variant so far.
>
> to =
> (
> - \( kmalloc \| kzalloc \)
> + memdup_user
> |
> - \( kvmalloc \| kvzalloc \)
> + vmemdup_user
> )
> (
> - size, \( GFP_KERNEL \| GFP_USER \)
> + from, size
> );
>
>
> Message:
> 25: no available token to attach to
I have adjusted a bit of OCaml source code.
Thus I could see where such information was provided.
https://github.com/coccinelle/coccinelle/blob/7cf2c23e64066d5249a64a316cc5347831f7a63f/parsing_cocci/insert_plus.ml#L1041
…
| (((infop,count,pcode) as p) :: ps) as all ->
(* …
modifications. for the moment, we thus give an error, asking the
user to rewrite the semantic patch. *)
if greater_than_end infop infom1 || is_minus m1 || !empty_isos
…
Will the referenced comment get any more software development attention?
Regards,
Markus
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user()
@ 2020-06-01 6:24 ` Markus Elfring
0 siblings, 0 replies; 9+ messages in thread
From: Markus Elfring @ 2020-06-01 6:24 UTC (permalink / raw)
To: Denis Efremov, Gilles Muller, Julia Lawall, Masahiro Yamada,
Michal Marek, Nicolas Palix, Coccinelle
Cc: kernel-janitors, linux-kernel, Joe Perches
> +@rv depends on !patch@
> +expression from,to,size;
> +position p;
> +statement S1,S2;
> +@@
> +
> +* to = \(kvmalloc@p\|kvzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));
> + if (to==NULL || ...) S1
> + if (copy_from_user(to, from, size) != 0)
> + S2
How does the SmPL asterisk functionality fit to the operation
modes “org” and “report”?
> +@script:python depends on org && r@
I find the modification of SmPL rule dependencies also interesting.
Are these specifications really required?
Regards,
Markus
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user()
@ 2020-06-01 6:24 ` Markus Elfring
0 siblings, 0 replies; 9+ messages in thread
From: Markus Elfring @ 2020-06-01 6:24 UTC (permalink / raw)
To: Denis Efremov, Gilles Muller, Julia Lawall, Masahiro Yamada,
Michal Marek, Nicolas Palix, Coccinelle
Cc: Joe Perches, kernel-janitors, linux-kernel
> +@rv depends on !patch@
> +expression from,to,size;
> +position p;
> +statement S1,S2;
> +@@
> +
> +* to = \(kvmalloc@p\|kvzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));
> + if (to==NULL || ...) S1
> + if (copy_from_user(to, from, size) != 0)
> + S2
How does the SmPL asterisk functionality fit to the operation
modes “org” and “report”?
> +@script:python depends on org && r@
I find the modification of SmPL rule dependencies also interesting.
Are these specifications really required?
Regards,
Markus
^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH 0/2] Update memdup_user.cocci
@ 2020-05-30 20:53 Denis Efremov
2020-05-30 20:53 ` [PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user() Denis Efremov
0 siblings, 1 reply; 9+ messages in thread
From: Denis Efremov @ 2020-05-30 20:53 UTC (permalink / raw)
To: Julia Lawall, Joe Perches; +Cc: Denis Efremov, cocci, linux-kernel
Add GFP_USER to the allocation flags and handle vmemdup_user().
Denis Efremov (2):
Coccinelle: extend memdup_user transformation with GFP_USER
Coccinelle: extend memdup_user rule with vmemdup_user()
scripts/coccinelle/api/memdup_user.cocci | 53 ++++++++++++++++++++++--
1 file changed, 49 insertions(+), 4 deletions(-)
--
2.26.2
^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user()
2020-05-30 20:53 [PATCH 0/2] Update memdup_user.cocci Denis Efremov
@ 2020-05-30 20:53 ` Denis Efremov
0 siblings, 0 replies; 9+ messages in thread
From: Denis Efremov @ 2020-05-30 20:53 UTC (permalink / raw)
To: Julia Lawall, Joe Perches; +Cc: Denis Efremov, cocci, linux-kernel
Add vmemdup_user() transformations to the memdup_user.cocci rule.
Commit 50fd2f298bef ("new primitive: vmemdup_user()") introduced
vmemdup_user(). The function uses kvmalloc with GPF_USER flag.
Signed-off-by: Denis Efremov <efremov@linux.com>
---
scripts/coccinelle/api/memdup_user.cocci | 49 +++++++++++++++++++++++-
1 file changed, 47 insertions(+), 2 deletions(-)
diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index 49f487e6a5c8..a50def35136e 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -37,6 +37,28 @@ identifier l1,l2;
- ...+>
- }
+@depends on patch@
+expression from,to,size;
+identifier l1,l2;
+@@
+
+- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
++ to = vmemdup_user(from,size);
+ if (
+- to==NULL
++ IS_ERR(to)
+ || ...) {
+ <+... when != goto l1;
+- -ENOMEM
++ PTR_ERR(to)
+ ...+>
+ }
+- if (copy_from_user(to, from, size) != 0) {
+- <+... when != goto l2;
+- -EFAULT
+- ...+>
+- }
+
@r depends on !patch@
expression from,to,size;
position p;
@@ -48,14 +70,37 @@ statement S1,S2;
if (copy_from_user(to, from, size) != 0)
S2
-@script:python depends on org@
+@rv depends on !patch@
+expression from,to,size;
+position p;
+statement S1,S2;
+@@
+
+* to = \(kvmalloc@p\|kvzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));
+ if (to==NULL || ...) S1
+ if (copy_from_user(to, from, size) != 0)
+ S2
+
+@script:python depends on org && r@
p << r.p;
@@
coccilib.org.print_todo(p[0], "WARNING opportunity for memdup_user")
-@script:python depends on report@
+@script:python depends on report && r@
p << r.p;
@@
coccilib.report.print_report(p[0], "WARNING opportunity for memdup_user")
+
+@script:python depends on org && rv@
+p << rv.p;
+@@
+
+coccilib.org.print_todo(p[0], "WARNING opportunity for vmemdup_user")
+
+@script:python depends on report && rv@
+p << rv.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING opportunity for vmemdup_user")
--
2.26.2
^ permalink raw reply related [flat|nested] 9+ messages in thread
end of thread, other threads:[~2020-06-01 6:24 UTC | newest]
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2020-05-31 18:43 [PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user() Markus Elfring
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2020-05-31 18:43 ` Markus Elfring
2020-06-01 5:47 ` [2/2] Coccinelle: memdup_user: Extending data processing for special tokens Markus Elfring
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2020-06-01 6:24 [PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user() Markus Elfring
2020-06-01 6:24 ` Markus Elfring
2020-05-30 20:53 [PATCH 0/2] Update memdup_user.cocci Denis Efremov
2020-05-30 20:53 ` [PATCH 2/2] Coccinelle: extend memdup_user rule with vmemdup_user() Denis Efremov
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