* [Cocci] [PATCH v3 0/3] Update memdup_user.cocci
@ 2020-07-20 16:22 ` Denis Efremov
0 siblings, 0 replies; 18+ messages in thread
From: Denis Efremov @ 2020-07-20 16:22 UTC (permalink / raw)
To: Julia Lawall; +Cc: cocci, linux-kernel
Add GFP_USER to the allocation flags and handle vmemdup_user().
Changes in v2:
- memdup_user/vmemdup_user matching suppressed
- PoC for selfcheck virtual rule
Changes in v3:
- add missing '-' for patch rule in kmalloc/kzalloc call args
- selfcheck rule dropped from patchset
Denis Efremov (3):
coccinelle: api: extend memdup_user transformation with GFP_USER
coccinelle: api: extend memdup_user rule with vmemdup_user()
coccinelle: api: filter out memdup_user definitions
scripts/coccinelle/api/memdup_user.cocci | 64 ++++++++++++++++++++++--
1 file changed, 61 insertions(+), 3 deletions(-)
--
2.26.2
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^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v3 1/3] coccinelle: api: extend memdup_user transformation with GFP_USER
2020-07-20 16:22 ` [Cocci] " Denis Efremov
@ 2020-07-20 16:22 ` Denis Efremov
-1 siblings, 0 replies; 18+ messages in thread
From: Denis Efremov @ 2020-07-20 16:22 UTC (permalink / raw)
To: Julia Lawall; +Cc: Denis Efremov, cocci, linux-kernel
Match GFP_USER and optional __GFP_NOWARN allocations with
memdup_user.cocci rule.
Commit 6c2c97a24f09 ("memdup_user(): switch to GFP_USER") switched
memdup_user() from GFP_KERNEL to GFP_USER. In almost all cases it
is still a good idea to recommend memdup_user() for GFP_KERNEL
allocations. The motivation behind altering memdup_user() to GFP_USER:
https://lkml.org/lkml/2018/1/6/333
Signed-off-by: Denis Efremov <efremov@linux.com>
---
scripts/coccinelle/api/memdup_user.cocci | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index c809ab10bbce..0e29d41ecab8 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -20,7 +20,9 @@ expression from,to,size;
identifier l1,l2;
@@
-- to = \(kmalloc\|kzalloc\)(size,GFP_KERNEL);
+- to = \(kmalloc\|kzalloc\)
+- (size,\(GFP_KERNEL\|GFP_USER\|
+- \(GFP_KERNEL\|GFP_USER\)|__GFP_NOWARN\));
+ to = memdup_user(from,size);
if (
- to==NULL
@@ -43,7 +45,9 @@ position p;
statement S1,S2;
@@
-* to = \(kmalloc@p\|kzalloc@p\)(size,GFP_KERNEL);
+* to = \(kmalloc@p\|kzalloc@p\)
+ (size,\(GFP_KERNEL\|GFP_USER\|
+ \(GFP_KERNEL\|GFP_USER\)|__GFP_NOWARN\));
if (to==NULL || ...) S1
if (copy_from_user(to, from, size) != 0)
S2
--
2.26.2
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [Cocci] [PATCH v3 1/3] coccinelle: api: extend memdup_user transformation with GFP_USER
@ 2020-07-20 16:22 ` Denis Efremov
0 siblings, 0 replies; 18+ messages in thread
From: Denis Efremov @ 2020-07-20 16:22 UTC (permalink / raw)
To: Julia Lawall; +Cc: cocci, linux-kernel
Match GFP_USER and optional __GFP_NOWARN allocations with
memdup_user.cocci rule.
Commit 6c2c97a24f09 ("memdup_user(): switch to GFP_USER") switched
memdup_user() from GFP_KERNEL to GFP_USER. In almost all cases it
is still a good idea to recommend memdup_user() for GFP_KERNEL
allocations. The motivation behind altering memdup_user() to GFP_USER:
https://lkml.org/lkml/2018/1/6/333
Signed-off-by: Denis Efremov <efremov@linux.com>
---
scripts/coccinelle/api/memdup_user.cocci | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index c809ab10bbce..0e29d41ecab8 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -20,7 +20,9 @@ expression from,to,size;
identifier l1,l2;
@@
-- to = \(kmalloc\|kzalloc\)(size,GFP_KERNEL);
+- to = \(kmalloc\|kzalloc\)
+- (size,\(GFP_KERNEL\|GFP_USER\|
+- \(GFP_KERNEL\|GFP_USER\)|__GFP_NOWARN\));
+ to = memdup_user(from,size);
if (
- to==NULL
@@ -43,7 +45,9 @@ position p;
statement S1,S2;
@@
-* to = \(kmalloc@p\|kzalloc@p\)(size,GFP_KERNEL);
+* to = \(kmalloc@p\|kzalloc@p\)
+ (size,\(GFP_KERNEL\|GFP_USER\|
+ \(GFP_KERNEL\|GFP_USER\)|__GFP_NOWARN\));
if (to==NULL || ...) S1
if (copy_from_user(to, from, size) != 0)
S2
--
2.26.2
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^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user()
2020-07-20 16:22 ` [Cocci] " Denis Efremov
@ 2020-07-20 16:22 ` Denis Efremov
-1 siblings, 0 replies; 18+ messages in thread
From: Denis Efremov @ 2020-07-20 16:22 UTC (permalink / raw)
To: Julia Lawall; +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 | 45 ++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index 0e29d41ecab8..60027e21c5e6 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -39,6 +39,28 @@ 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;
@@ -52,6 +74,17 @@ statement S1,S2;
if (copy_from_user(to, from, size) != 0)
S2
+@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@
p << r.p;
@@
@@ -63,3 +96,15 @@ p << r.p;
@@
coccilib.report.print_report(p[0], "WARNING opportunity for memdup_user")
+
+@script:python depends on org@
+p << rv.p;
+@@
+
+coccilib.org.print_todo(p[0], "WARNING opportunity for vmemdup_user")
+
+@script:python depends on report@
+p << rv.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING opportunity for vmemdup_user")
--
2.26.2
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [Cocci] [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user()
@ 2020-07-20 16:22 ` Denis Efremov
0 siblings, 0 replies; 18+ messages in thread
From: Denis Efremov @ 2020-07-20 16:22 UTC (permalink / raw)
To: Julia Lawall; +Cc: 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 | 45 ++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index 0e29d41ecab8..60027e21c5e6 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -39,6 +39,28 @@ 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;
@@ -52,6 +74,17 @@ statement S1,S2;
if (copy_from_user(to, from, size) != 0)
S2
+@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@
p << r.p;
@@
@@ -63,3 +96,15 @@ p << r.p;
@@
coccilib.report.print_report(p[0], "WARNING opportunity for memdup_user")
+
+@script:python depends on org@
+p << rv.p;
+@@
+
+coccilib.org.print_todo(p[0], "WARNING opportunity for vmemdup_user")
+
+@script:python depends on report@
+p << rv.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING opportunity for vmemdup_user")
--
2.26.2
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Cocci@systeme.lip6.fr
https://systeme.lip6.fr/mailman/listinfo/cocci
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v3 3/3] coccinelle: api: filter out memdup_user definitions
2020-07-20 16:22 ` [Cocci] " Denis Efremov
@ 2020-07-20 16:22 ` Denis Efremov
-1 siblings, 0 replies; 18+ messages in thread
From: Denis Efremov @ 2020-07-20 16:22 UTC (permalink / raw)
To: Julia Lawall; +Cc: Denis Efremov, cocci, linux-kernel
Don't match memdup_user/vmemdup_user.
Signed-off-by: Denis Efremov <efremov@linux.com>
---
scripts/coccinelle/api/memdup_user.cocci | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index 60027e21c5e6..e01e95108405 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -15,12 +15,20 @@ virtual context
virtual org
virtual report
+@initialize:python@
+@@
+filter = frozenset(['memdup_user', 'vmemdup_user'])
+
+def relevant(p):
+ return not (filter & {el.current_element for el in p})
+
@depends on patch@
expression from,to,size;
identifier l1,l2;
+position p : script:python() { relevant(p) };
@@
-- to = \(kmalloc\|kzalloc\)
+- to = \(kmalloc@p\|kzalloc@p\)
- (size,\(GFP_KERNEL\|GFP_USER\|
- \(GFP_KERNEL\|GFP_USER\)|__GFP_NOWARN\));
+ to = memdup_user(from,size);
@@ -42,9 +50,10 @@ identifier l1,l2;
@depends on patch@
expression from,to,size;
identifier l1,l2;
+position p : script:python() { relevant(p) };
@@
-- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
+- to = \(kvmalloc@p\|kvzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));
+ to = vmemdup_user(from,size);
if (
- to==NULL
@@ -63,7 +72,7 @@ identifier l1,l2;
@r depends on !patch@
expression from,to,size;
-position p;
+position p : script:python() { relevant(p) };
statement S1,S2;
@@
@@ -76,7 +85,7 @@ statement S1,S2;
@rv depends on !patch@
expression from,to,size;
-position p;
+position p : script:python() { relevant(p) };
statement S1,S2;
@@
--
2.26.2
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [Cocci] [PATCH v3 3/3] coccinelle: api: filter out memdup_user definitions
@ 2020-07-20 16:22 ` Denis Efremov
0 siblings, 0 replies; 18+ messages in thread
From: Denis Efremov @ 2020-07-20 16:22 UTC (permalink / raw)
To: Julia Lawall; +Cc: cocci, linux-kernel
Don't match memdup_user/vmemdup_user.
Signed-off-by: Denis Efremov <efremov@linux.com>
---
scripts/coccinelle/api/memdup_user.cocci | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index 60027e21c5e6..e01e95108405 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -15,12 +15,20 @@ virtual context
virtual org
virtual report
+@initialize:python@
+@@
+filter = frozenset(['memdup_user', 'vmemdup_user'])
+
+def relevant(p):
+ return not (filter & {el.current_element for el in p})
+
@depends on patch@
expression from,to,size;
identifier l1,l2;
+position p : script:python() { relevant(p) };
@@
-- to = \(kmalloc\|kzalloc\)
+- to = \(kmalloc@p\|kzalloc@p\)
- (size,\(GFP_KERNEL\|GFP_USER\|
- \(GFP_KERNEL\|GFP_USER\)|__GFP_NOWARN\));
+ to = memdup_user(from,size);
@@ -42,9 +50,10 @@ identifier l1,l2;
@depends on patch@
expression from,to,size;
identifier l1,l2;
+position p : script:python() { relevant(p) };
@@
-- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
+- to = \(kvmalloc@p\|kvzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));
+ to = vmemdup_user(from,size);
if (
- to==NULL
@@ -63,7 +72,7 @@ identifier l1,l2;
@r depends on !patch@
expression from,to,size;
-position p;
+position p : script:python() { relevant(p) };
statement S1,S2;
@@
@@ -76,7 +85,7 @@ statement S1,S2;
@rv depends on !patch@
expression from,to,size;
-position p;
+position p : script:python() { relevant(p) };
statement S1,S2;
@@
--
2.26.2
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^ permalink raw reply related [flat|nested] 18+ messages in thread
* Re: [PATCH v3 0/3] Update memdup_user.cocci
2020-07-20 16:22 ` [Cocci] " Denis Efremov
@ 2020-07-24 20:02 ` Julia Lawall
-1 siblings, 0 replies; 18+ messages in thread
From: Julia Lawall @ 2020-07-24 20:02 UTC (permalink / raw)
To: Denis Efremov; +Cc: cocci, linux-kernel
On Mon, 20 Jul 2020, Denis Efremov wrote:
> Add GFP_USER to the allocation flags and handle vmemdup_user().
>
> Changes in v2:
> - memdup_user/vmemdup_user matching suppressed
> - PoC for selfcheck virtual rule
> Changes in v3:
> - add missing '-' for patch rule in kmalloc/kzalloc call args
> - selfcheck rule dropped from patchset
>
> Denis Efremov (3):
> coccinelle: api: extend memdup_user transformation with GFP_USER
> coccinelle: api: extend memdup_user rule with vmemdup_user()
> coccinelle: api: filter out memdup_user definitions
All three applied. Thanks.
julia
>
> scripts/coccinelle/api/memdup_user.cocci | 64 ++++++++++++++++++++++--
> 1 file changed, 61 insertions(+), 3 deletions(-)
>
> --
> 2.26.2
>
>
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [Cocci] [PATCH v3 0/3] Update memdup_user.cocci
@ 2020-07-24 20:02 ` Julia Lawall
0 siblings, 0 replies; 18+ messages in thread
From: Julia Lawall @ 2020-07-24 20:02 UTC (permalink / raw)
To: Denis Efremov; +Cc: cocci, linux-kernel
On Mon, 20 Jul 2020, Denis Efremov wrote:
> Add GFP_USER to the allocation flags and handle vmemdup_user().
>
> Changes in v2:
> - memdup_user/vmemdup_user matching suppressed
> - PoC for selfcheck virtual rule
> Changes in v3:
> - add missing '-' for patch rule in kmalloc/kzalloc call args
> - selfcheck rule dropped from patchset
>
> Denis Efremov (3):
> coccinelle: api: extend memdup_user transformation with GFP_USER
> coccinelle: api: extend memdup_user rule with vmemdup_user()
> coccinelle: api: filter out memdup_user definitions
All three applied. Thanks.
julia
>
> scripts/coccinelle/api/memdup_user.cocci | 64 ++++++++++++++++++++++--
> 1 file changed, 61 insertions(+), 3 deletions(-)
>
> --
> 2.26.2
>
>
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^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user()
@ 2020-07-21 9:30 ` Markus Elfring
0 siblings, 0 replies; 18+ messages in thread
From: Markus Elfring @ 2020-07-21 9:30 UTC (permalink / raw)
To: Denis Efremov, Coccinelle, Gilles Muller, Julia Lawall,
Masahiro Yamada, Michal Marek, Nicolas Palix
Cc: linux-kernel, kernel-janitors
…
> +++ b/scripts/coccinelle/api/memdup_user.cocci
> @@ -39,6 +39,28 @@ …
…
> +@depends on patch@
> +expression from,to,size;
> +identifier l1,l2;
> +@@
> +
> +- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
> ++ to = vmemdup_user(from,size);
I propose to combine the desired adjustment with the previous SmPL rule
by using another disjunction.
> +@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
* Can it be helpful to omit the SmPL asterisk functionality from
the operation modes “org” and “report”?
* Should the operation mode “context” work without an extra position metavariable?
Regards,
Markus
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user()
2020-07-21 9:30 ` Markus Elfring
@ 2020-07-21 9:58 ` Julia Lawall
-1 siblings, 0 replies; 18+ messages in thread
From: Julia Lawall @ 2020-07-21 9:58 UTC (permalink / raw)
To: Markus Elfring
Cc: Denis Efremov, Coccinelle, Gilles Muller, Masahiro Yamada,
Michal Marek, Nicolas Palix, linux-kernel, kernel-janitors
[-- Attachment #1: Type: text/plain, Size: 980 bytes --]
On Tue, 21 Jul 2020, Markus Elfring wrote:
> …
> > +++ b/scripts/coccinelle/api/memdup_user.cocci
> > @@ -39,6 +39,28 @@ …
> …
> > +@depends on patch@
> > +expression from,to,size;
> > +identifier l1,l2;
> > +@@
> > +
> > +- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
> > ++ to = vmemdup_user(from,size);
>
> I propose to combine the desired adjustment with the previous SmPL rule
> by using another disjunction.
>
>
> > +@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
>
> * Can it be helpful to omit the SmPL asterisk functionality from
> the operation modes “org” and “report”?
>
> * Should the operation mode “context” work without an extra position metavariable?
This is fine as is in all three aspects.
julia
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user()
@ 2020-07-21 9:58 ` Julia Lawall
0 siblings, 0 replies; 18+ messages in thread
From: Julia Lawall @ 2020-07-21 9:58 UTC (permalink / raw)
To: Markus Elfring
Cc: Michal Marek, Gilles Muller, kernel-janitors, Nicolas Palix,
linux-kernel, Coccinelle
[-- Attachment #1: Type: text/plain, Size: 980 bytes --]
On Tue, 21 Jul 2020, Markus Elfring wrote:
> …
> > +++ b/scripts/coccinelle/api/memdup_user.cocci
> > @@ -39,6 +39,28 @@ …
> …
> > +@depends on patch@
> > +expression from,to,size;
> > +identifier l1,l2;
> > +@@
> > +
> > +- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
> > ++ to = vmemdup_user(from,size);
>
> I propose to combine the desired adjustment with the previous SmPL rule
> by using another disjunction.
>
>
> > +@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
>
> * Can it be helpful to omit the SmPL asterisk functionality from
> the operation modes “org” and “report”?
>
> * Should the operation mode “context” work without an extra position metavariable?
This is fine as is in all three aspects.
julia
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user()
2020-07-21 9:58 ` Julia Lawall
@ 2020-07-22 5:50 ` Markus Elfring
-1 siblings, 0 replies; 18+ messages in thread
From: Markus Elfring @ 2020-07-22 5:50 UTC (permalink / raw)
To: Julia Lawall, Denis Efremov, Coccinelle
Cc: Gilles Muller, Masahiro Yamada, Michal Marek, Nicolas Palix,
linux-kernel, kernel-janitors
>>> +@depends on patch@
>>> +expression from,to,size;
>>> +identifier l1,l2;
>>> +@@
>>> +
>>> +- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
>>> ++ to = vmemdup_user(from,size);
>>
>> I propose to combine the desired adjustment with the previous SmPL rule
>> by using another disjunction.
How do you think about to check run time characteristics for
the following SmPL script sketches?
A)
@R1@
@@
// Change something
@R2@
@@
// Change another thing
B)
@Replacement_with_disjunction@
@@
(
// R1: Change something
|
// R2: Change another thing
)
>>> +@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
>>
>> * Can it be helpful to omit the SmPL asterisk functionality from
>> the operation modes “org” and “report”?
>>
>> * Should the operation mode “context” work without an extra position metavariable?
>
> This is fine as is in all three aspects.
Is every technique from the Coccinelle software required for
each operation mode in such data processing approaches?
Regards,
Markus
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user()
@ 2020-07-22 5:50 ` Markus Elfring
0 siblings, 0 replies; 18+ messages in thread
From: Markus Elfring @ 2020-07-22 5:50 UTC (permalink / raw)
To: Julia Lawall, Denis Efremov, Coccinelle
Cc: Gilles Muller, Masahiro Yamada, Michal Marek, Nicolas Palix,
linux-kernel, kernel-janitors
>>> +@depends on patch@
>>> +expression from,to,size;
>>> +identifier l1,l2;
>>> +@@
>>> +
>>> +- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
>>> ++ to = vmemdup_user(from,size);
>>
>> I propose to combine the desired adjustment with the previous SmPL rule
>> by using another disjunction.
How do you think about to check run time characteristics for
the following SmPL script sketches?
A)
@R1@
@@
// Change something
@R2@
@@
// Change another thing
B)
@Replacement_with_disjunction@
@@
(
// R1: Change something
|
// R2: Change another thing
)
>>> +@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
>>
>> * Can it be helpful to omit the SmPL asterisk functionality from
>> the operation modes “org” and “report”?
>>
>> * Should the operation mode “context” work without an extra position metavariable?
>
> This is fine as is in all three aspects.
Is every technique from the Coccinelle software required for
each operation mode in such data processing approaches?
Regards,
Markus
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user()
2020-07-22 5:50 ` Markus Elfring
@ 2020-07-22 6:02 ` Julia Lawall
-1 siblings, 0 replies; 18+ messages in thread
From: Julia Lawall @ 2020-07-22 6:02 UTC (permalink / raw)
To: Markus Elfring
Cc: Denis Efremov, Coccinelle, Gilles Muller, Masahiro Yamada,
Michal Marek, Nicolas Palix, linux-kernel, kernel-janitors
[-- Attachment #1: Type: text/plain, Size: 1496 bytes --]
On Wed, 22 Jul 2020, Markus Elfring wrote:
> >>> +@depends on patch@
> >>> +expression from,to,size;
> >>> +identifier l1,l2;
> >>> +@@
> >>> +
> >>> +- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
> >>> ++ to = vmemdup_user(from,size);
> >>
> >> I propose to combine the desired adjustment with the previous SmPL rule
> >> by using another disjunction.
>
> How do you think about to check run time characteristics for
> the following SmPL script sketches?
>
> A)
> @R1@
> @@
> // Change something
>
> @R2@
> @@
> // Change another thing
>
>
> B)
> @Replacement_with_disjunction@
> @@
> (
> // R1: Change something
> |
> // R2: Change another thing
> )
Markus, you are welcome to try this since you are concerned about it.
But it doesn't matter.
julia
>
>
> >>> +@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
> >>
> >> * Can it be helpful to omit the SmPL asterisk functionality from
> >> the operation modes “org” and “report”?
> >>
> >> * Should the operation mode “context” work without an extra position metavariable?
> >
> > This is fine as is in all three aspects.
>
> Is every technique from the Coccinelle software required for
> each operation mode in such data processing approaches?
>
> Regards,
> Markus
>
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup_user()
@ 2020-07-22 6:02 ` Julia Lawall
0 siblings, 0 replies; 18+ messages in thread
From: Julia Lawall @ 2020-07-22 6:02 UTC (permalink / raw)
To: Markus Elfring
Cc: Michal Marek, Gilles Muller, kernel-janitors, Nicolas Palix,
linux-kernel, Coccinelle
[-- Attachment #1: Type: text/plain, Size: 1496 bytes --]
On Wed, 22 Jul 2020, Markus Elfring wrote:
> >>> +@depends on patch@
> >>> +expression from,to,size;
> >>> +identifier l1,l2;
> >>> +@@
> >>> +
> >>> +- to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
> >>> ++ to = vmemdup_user(from,size);
> >>
> >> I propose to combine the desired adjustment with the previous SmPL rule
> >> by using another disjunction.
>
> How do you think about to check run time characteristics for
> the following SmPL script sketches?
>
> A)
> @R1@
> @@
> // Change something
>
> @R2@
> @@
> // Change another thing
>
>
> B)
> @Replacement_with_disjunction@
> @@
> (
> // R1: Change something
> |
> // R2: Change another thing
> )
Markus, you are welcome to try this since you are concerned about it.
But it doesn't matter.
julia
>
>
> >>> +@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
> >>
> >> * Can it be helpful to omit the SmPL asterisk functionality from
> >> the operation modes “org” and “report”?
> >>
> >> * Should the operation mode “context” work without an extra position metavariable?
> >
> > This is fine as is in all three aspects.
>
> Is every technique from the Coccinelle software required for
> each operation mode in such data processing approaches?
>
> Regards,
> Markus
>
^ permalink raw reply [flat|nested] 18+ messages in thread