On Wed, 2020-10-07 at 09:53 -0300, Jason Gunthorpe wrote:
> On Wed, Oct 07, 2020 at 12:16:01AM -0700, Kees Cook wrote:
> > On Tue, Oct 06, 2020 at 09:28:17AM -0700, Joe Perches wrote:
> > > Convert the various uses of sprintf/snprintf/scnprintf to
> > > format sysfs output to sysfs_emit and sysfs_emit_at to make
> > > clear the output is sysfs related and to avoid any possible
> > > buffer overrun of the PAGE_SIZE buffer.
> > >
> > > Done with cocci scripts and some typing.
> >
> > Can you include the cocci script in the commit log? It might be nicer to
> > split the "manual" changes from the cocci changes, as that makes review
> > much easier too.
> >
> > Regardless, yes, I'm a fan of switching these all around to
> > sysfs_emit*(). :)
>
> Yah, +1, I'd welcome patches for drivers/infiniband as well next cycle
The script to change <foo>_show(struct device *, ...)
function uses of
sprintf to sysfs_emit is attached.
The cocci script is coarse and doesn't find nor change all
the possible variants of the sprintf uses in these functions.
It could be run using:
$ spatch --in-place -sp-file sysfs_emit.cocci drivers/infiniband/
Against next-20201007 it produces:
$ git diff --shortstat drivers/infiniband
25 files changed, 322 insertions(+), 303 deletions(-)
Because it touches a lot of drivers, the 'cc' list is
pretty large for the diff.
Given the size of the cc list, unless there's a single
acceptable patch, I will not submit individual patches as
I really dislike the back and forth of this sub-maintainer
will but this sub-maintainer will not apply a patch.
Doug Ledford <dledford@xxxxxxxxxx> (supporter:INFINIBAND SUBSYSTEM)
Jason Gunthorpe <jgg@xxxxxxxx> (supporter:INFINIBAND SUBSYSTEM)
Selvin Xavier <selvin.xavier@xxxxxxxxxxxx> (supporter:BROADCOM NETXTREME-E ROCE DRIVER)
Devesh Sharma <devesh.sharma@xxxxxxxxxxxx> (supporter:BROADCOM NETXTREME-E ROCE DRIVER)
Somnath Kotur <somnath.kotur@xxxxxxxxxxxx> (supporter:BROADCOM NETXTREME-E ROCE DRIVER)
Sriharsha Basavapatna <sriharsha.basavapatna@xxxxxxxxxxxx> (supporter:BROADCOM NETXTREME-E ROCE DRIVER)
Naresh Kumar PBS <nareshkumar.pbs@xxxxxxxxxxxx> (supporter:BROADCOM NETXTREME-E ROCE DRIVER)
Potnuri Bharat Teja <bharat@xxxxxxxxxxx> (supporter:CXGB4 IWARP RNIC DRIVER (IW_CXGB4))
Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx> (supporter:HFI1 DRIVER)
Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx> (supporter:HFI1 DRIVER)
Faisal Latif <faisal.latif@xxxxxxxxx> (supporter:INTEL RDMA RNIC DRIVER)
Shiraz Saleem <shiraz.saleem@xxxxxxxxx> (supporter:INTEL RDMA RNIC DRIVER)
Yishai Hadas <yishaih@xxxxxxxxxx> (supporter:MELLANOX MLX4 IB driver)
Leon Romanovsky <leon@xxxxxxxxxx> (supporter:MELLANOX MLX5 IB driver)
Michal Kalderon <mkalderon@xxxxxxxxxxx> (supporter:QLOGIC QL4xxx RDMA DRIVER)
Ariel Elior <aelior@xxxxxxxxxxx> (supporter:QLOGIC QL4xxx RDMA DRIVER)
Christian Benvenuti <benve@xxxxxxxxx> (supporter:CISCO VIC LOW LATENCY NIC DRIVER)
Nelson Escobar <neescoba@xxxxxxxxx> (supporter:CISCO VIC LOW LATENCY NIC DRIVER)
Parvi Kaustubhi <pkaustub@xxxxxxxxx> (supporter:CISCO VIC LOW LATENCY NIC DRIVER)
Adit Ranadive <aditr@xxxxxxxxxx> (maintainer:VMWARE PVRDMA DRIVER)
VMware PV-Drivers <pv-drivers@xxxxxxxxxx> (maintainer:VMWARE PVRDMA DRIVER)
Zhu Yanjun <yanjunz@xxxxxxxxxx> (supporter:SOFT-ROCE DRIVER (rxe))
Danil Kipnis <danil.kipnis@xxxxxxxxxxxxxxx> (maintainer:RTRS TRANSPORT DRIVERS)
Jack Wang <jinpu.wang@xxxxxxxxxxxxxxx> (maintainer:RTRS TRANSPORT DRIVERS)
Bart Van Assche <bvanassche@xxxxxxx> (supporter:SCSI RDMA PROTOCOL (SRP) INITIATOR)
linux-rdma@xxxxxxxxxxxxxxx (open list:INFINIBAND SUBSYSTEM)
linux-kernel@xxxxxxxxxxxxxxx (open list)
@@
//identifier d_show =~ "^.*show.*$";
identifier d_show;
identifier arg1, arg2, arg3;
@@
ssize_t d_show(struct device *
- arg1
+ dev
, struct device_attribute *
- arg2
+ attr
, char *
- arg3
+ buf
)
{
<...
(
- arg1
+ dev
|
- arg2
+ attr
|
- arg3
+ buf
)
...>
}
@@
//identifier d_show =~ "^.*show.*$";
identifier d_show;
identifier dev, attr, buf;
@@
ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
return
- sprintf(buf,
+ sysfs_emit(buf,
...);
...>
}
@@
//identifier d_show =~ "^.*show.*$";
identifier d_show;
identifier dev, attr, buf;
@@
ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
return
- snprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
}
@@
//identifier d_show =~ "^.*show.*$";
identifier d_show;
identifier dev, attr, buf;
@@
ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
return
- scnprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
}
@@
//identifier d_show =~ "^.*show.*$";
identifier d_show;
identifier dev, attr, buf;
expression chr;
@@
ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
return
- strcpy(buf, chr);
+ sysfs_emit(buf, chr);
...>
}
@@
//identifier d_show =~ "^.*show.*$";
identifier d_show;
identifier dev, attr, buf;
identifier len;
@@
ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
len =
- sprintf(buf,
+ sysfs_emit(buf,
...);
...>
return len;
}
@@
//identifier d_show =~ "^.*show.*$";
identifier d_show;
identifier dev, attr, buf;
identifier len;
@@
ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
len =
- snprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
return len;
}
@@
//identifier d_show =~ "^.*show.*$";
identifier d_show;
identifier dev, attr, buf;
identifier len;
@@
ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
len =
- scnprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
return len;
}
@@
//identifier d_show =~ "^.*show.*$";
identifier d_show;
identifier dev, attr, buf;
identifier len;
@@
ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
- len += scnprintf(buf + len, PAGE_SIZE - len,
+ len += sysfs_emit_at(buf, len,
...);
...>
return len;
}
@@
//identifier d_show =~ "^.*show.*$";
identifier d_show;
identifier dev, attr, buf;
expression chr;
@@
ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
- strcpy(buf, chr);
- return strlen(buf);
+ return sysfs_emit(buf, chr);
}
@@
identifier k_show =~ "^.*show.*$";
identifier arg1, arg2, arg3;
@@
ssize_t k_show(struct kobject *
- arg1
+ kobj
, struct kobj_attribute *
- arg2
+ attr
, char *
- arg3
+ buf
)
{
...
(
- arg1
+ kobj
|
- arg2
+ attr
|
- arg3
+ buf
)
...
}
@@
identifier k_show =~ "^.*show.*$";
identifier kobj, attr, buf;
@@
ssize_t k_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
<...
return
- sprintf(buf,
+ sysfs_emit(buf,
...);
...>
}
@@
identifier k_show =~ "^.*show.*$";
identifier kobj, attr, buf;
@@
ssize_t k_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
<...
return
- snprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
}
@@
identifier k_show =~ "^.*show.*$";
identifier kobj, attr, buf;
@@
ssize_t k_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
<...
return
- scnprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
}
@@
identifier k_show =~ "^.*show.*$";
identifier kobj, attr, buf;
expression chr;
@@
ssize_t k_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
<...
return
- strcpy(buf, chr);
+ sysfs_emit(buf, chr);
...>
}
@@
identifier k_show =~ "^.*show.*$";
identifier kobj, attr, buf;
identifier len;
@@
ssize_t k_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
<...
len =
- sprintf(buf,
+ sysfs_emit(buf,
...);
...>
return len;
}
@@
identifier k_show =~ "^.*show.*$";
identifier kobj, attr, buf;
identifier len;
@@
ssize_t k_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
<...
len =
- snprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
return len;
}
@@
identifier k_show =~ "^.*show.*$";
identifier kobj, attr, buf;
identifier len;
@@
ssize_t k_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
<...
len =
- scnprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
return len;
}
@@
identifier k_show =~ "^.*show.*$";
identifier kobj, attr, buf;
identifier len;
@@
ssize_t k_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
<...
- len += scnprintf(buf + len, PAGE_SIZE - len,
+ len += sysfs_emit_at(buf, len,
...);
...>
return len;
}
@@
identifier k_show =~ "^.*show.*$";
identifier kobj, attr, buf;
expression chr;
@@
ssize_t k_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
- strcpy(buf, chr);
- return strlen(buf);
+ return sysfs_emit(buf, chr);
}
// Rename the sysfs_emit assigned variables not named len and not already int
// and set the name to len and type to int
@not_int_not_len exists@
type T != int;
identifier x != len;
position p;
identifier sysfs =~ "^sysfs_emit.*$";
assignment operator aop;
@@
T x@p;
...
x aop sysfs(...)
...
@@
type not_int_not_len.T;
identifier not_int_not_len.x;
position not_int_not_len.p;
@@
- T x@p;
+ int len;
<...
- x
+ len
...>
// Rename the already int sysfs_emit assigned variables not named len
// and set the name to len
@int_not_len exists@
type T = int;
identifier x != len;
position p;
identifier sysfs =~ "^sysfs_emit.*$";
assignment operator aop;
@@
T x@p;
...
x aop sysfs(...)
...
@@
type int_not_len.T;
identifier int_not_len.x;
position int_not_len.p;
@@
- T x@p;
+ int len;
<...
- x
+ len
...>
// Rename the non-int int sysfs_emit assigned variables named len
// and set the type to int
@not_int_has_len exists@
type T != int;
identifier x = len;
position p;
identifier sysfs =~ "^sysfs_emit.*$";
assignment operator aop;
@@
T x@p;
...
x aop sysfs(...)
...
@@
type not_int_has_len.T;
identifier not_int_has_len.x;
position not_int_has_len.p;
@@
- T x@p;
+ int len;
