* [PATCH] char: hw_random: core.c: Changed from using strncpy to strlcpy
@ 2014-10-11 22:36 Rickard Strandqvist
2014-10-12 0:27 ` Mark D Rustad
0 siblings, 1 reply; 5+ messages in thread
From: Rickard Strandqvist @ 2014-10-11 22:36 UTC (permalink / raw)
To: Matt Mackall, Herbert Xu
Cc: Rickard Strandqvist, Torsten Duwe, Theodore Ts'o,
Jason Cooper, Amit Shah, Stephen Boyd, Paul Gortmaker, Kees Cook,
Dan Carpenter, linux-kernel
Changed from using strncpy to strlcpy to simplify the code
Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
---
drivers/char/hw_random/core.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index aa30a25..1500cfd 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -281,7 +281,6 @@ static ssize_t hwrng_attr_available_show(struct device *dev,
char *buf)
{
int err;
- ssize_t ret = 0;
struct hwrng *rng;
err = mutex_lock_interruptible(&rng_mutex);
@@ -289,16 +288,13 @@ static ssize_t hwrng_attr_available_show(struct device *dev,
return -ERESTARTSYS;
buf[0] = '\0';
list_for_each_entry(rng, &rng_list, list) {
- strncat(buf, rng->name, PAGE_SIZE - ret - 1);
- ret += strlen(rng->name);
- strncat(buf, " ", PAGE_SIZE - ret - 1);
- ret++;
+ strlcat(buf, rng->name, PAGE_SIZE);
+ strlcat(buf, " ", PAGE_SIZE);
}
- strncat(buf, "\n", PAGE_SIZE - ret - 1);
- ret++;
+ strlcat(buf, "\n", PAGE_SIZE);
mutex_unlock(&rng_mutex);
- return ret;
+ return strlen(buf);
}
static DEVICE_ATTR(rng_current, S_IRUGO | S_IWUSR,
--
1.7.10.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] char: hw_random: core.c: Changed from using strncpy to strlcpy
2014-10-11 22:36 [PATCH] char: hw_random: core.c: Changed from using strncpy to strlcpy Rickard Strandqvist
@ 2014-10-12 0:27 ` Mark D Rustad
2014-10-12 2:11 ` Guenter Roeck
2014-10-12 10:32 ` Rickard Strandqvist
0 siblings, 2 replies; 5+ messages in thread
From: Mark D Rustad @ 2014-10-12 0:27 UTC (permalink / raw)
To: Rickard Strandqvist
Cc: Matt Mackall, Herbert Xu, Torsten Duwe, Theodore Ts'o,
Jason Cooper, Amit Shah, Stephen Boyd, Paul Gortmaker, Kees Cook,
Dan Carpenter, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 1520 bytes --]
On Oct 11, 2014, at 3:36 PM, Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> wrote:
> Changed from using strncpy to strlcpy to simplify the code
Actually you changed from using strncat to strlcat.
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
> ---
> drivers/char/hw_random/core.c | 12 ++++--------
> 1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
> index aa30a25..1500cfd 100644
> --- a/drivers/char/hw_random/core.c
> +++ b/drivers/char/hw_random/core.c
> @@ -281,7 +281,6 @@ static ssize_t hwrng_attr_available_show(struct device *dev,
> char *buf)
> {
> int err;
> - ssize_t ret = 0;
> struct hwrng *rng;
>
> err = mutex_lock_interruptible(&rng_mutex);
> @@ -289,16 +288,13 @@ static ssize_t hwrng_attr_available_show(struct device *dev,
> return -ERESTARTSYS;
> buf[0] = '\0';
> list_for_each_entry(rng, &rng_list, list) {
> - strncat(buf, rng->name, PAGE_SIZE - ret - 1);
> - ret += strlen(rng->name);
> - strncat(buf, " ", PAGE_SIZE - ret - 1);
> - ret++;
> + strlcat(buf, rng->name, PAGE_SIZE);
> + strlcat(buf, " ", PAGE_SIZE);
> }
> - strncat(buf, "\n", PAGE_SIZE - ret - 1);
> - ret++;
> + strlcat(buf, "\n", PAGE_SIZE);
> mutex_unlock(&rng_mutex);
>
> - return ret;
> + return strlen(buf);
> }
>
> static DEVICE_ATTR(rng_current, S_IRUGO | S_IWUSR,
> --
> 1.7.10.4
--
Mark Rustad, MRustad@gmail.com
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] char: hw_random: core.c: Changed from using strncpy to strlcpy
2014-10-12 0:27 ` Mark D Rustad
@ 2014-10-12 2:11 ` Guenter Roeck
2014-10-12 2:25 ` Guenter Roeck
2014-10-12 10:32 ` Rickard Strandqvist
1 sibling, 1 reply; 5+ messages in thread
From: Guenter Roeck @ 2014-10-12 2:11 UTC (permalink / raw)
To: Mark D Rustad
Cc: Rickard Strandqvist, Matt Mackall, Herbert Xu, Torsten Duwe,
Theodore Ts'o, Jason Cooper, Amit Shah, Stephen Boyd,
Paul Gortmaker, Kees Cook, Dan Carpenter, linux-kernel
On Sat, Oct 11, 2014 at 05:27:41PM -0700, Mark D Rustad wrote:
> On Oct 11, 2014, at 3:36 PM, Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> wrote:
>
> > Changed from using strncpy to strlcpy to simplify the code
>
> Actually you changed from using strncat to strlcat.
>
... and changed the length parameter along the way, making the length check
overall quite worthless and introducing a _real_ problem.
Guenter
> > Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
> > ---
> > drivers/char/hw_random/core.c | 12 ++++--------
> > 1 file changed, 4 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
> > index aa30a25..1500cfd 100644
> > --- a/drivers/char/hw_random/core.c
> > +++ b/drivers/char/hw_random/core.c
> > @@ -281,7 +281,6 @@ static ssize_t hwrng_attr_available_show(struct device *dev,
> > char *buf)
> > {
> > int err;
> > - ssize_t ret = 0;
> > struct hwrng *rng;
> >
> > err = mutex_lock_interruptible(&rng_mutex);
> > @@ -289,16 +288,13 @@ static ssize_t hwrng_attr_available_show(struct device *dev,
> > return -ERESTARTSYS;
> > buf[0] = '\0';
> > list_for_each_entry(rng, &rng_list, list) {
> > - strncat(buf, rng->name, PAGE_SIZE - ret - 1);
> > - ret += strlen(rng->name);
> > - strncat(buf, " ", PAGE_SIZE - ret - 1);
> > - ret++;
> > + strlcat(buf, rng->name, PAGE_SIZE);
> > + strlcat(buf, " ", PAGE_SIZE);
> > }
> > - strncat(buf, "\n", PAGE_SIZE - ret - 1);
> > - ret++;
> > + strlcat(buf, "\n", PAGE_SIZE);
> > mutex_unlock(&rng_mutex);
> >
> > - return ret;
> > + return strlen(buf);
> > }
> >
> > static DEVICE_ATTR(rng_current, S_IRUGO | S_IWUSR,
> > --
> > 1.7.10.4
>
> --
> Mark Rustad, MRustad@gmail.com
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] char: hw_random: core.c: Changed from using strncpy to strlcpy
2014-10-12 2:11 ` Guenter Roeck
@ 2014-10-12 2:25 ` Guenter Roeck
0 siblings, 0 replies; 5+ messages in thread
From: Guenter Roeck @ 2014-10-12 2:25 UTC (permalink / raw)
To: Mark D Rustad
Cc: Rickard Strandqvist, Matt Mackall, Herbert Xu, Torsten Duwe,
Theodore Ts'o, Jason Cooper, Amit Shah, Stephen Boyd,
Paul Gortmaker, Kees Cook, Dan Carpenter, linux-kernel
On Sat, Oct 11, 2014 at 07:11:22PM -0700, Guenter Roeck wrote:
> On Sat, Oct 11, 2014 at 05:27:41PM -0700, Mark D Rustad wrote:
> > On Oct 11, 2014, at 3:36 PM, Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> wrote:
> >
> > > Changed from using strncpy to strlcpy to simplify the code
> >
> > Actually you changed from using strncat to strlcat.
> >
> ... and changed the length parameter along the way, making the length check
> overall quite worthless and introducing a _real_ problem.
>
Me talking nonsense; ignore this noise.
Guenter
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] char: hw_random: core.c: Changed from using strncpy to strlcpy
2014-10-12 0:27 ` Mark D Rustad
2014-10-12 2:11 ` Guenter Roeck
@ 2014-10-12 10:32 ` Rickard Strandqvist
1 sibling, 0 replies; 5+ messages in thread
From: Rickard Strandqvist @ 2014-10-12 10:32 UTC (permalink / raw)
To: Mark D Rustad
Cc: Matt Mackall, Herbert Xu, Torsten Duwe, Theodore Ts'o,
Jason Cooper, Amit Shah, Stephen Boyd, Paul Gortmaker, Kees Cook,
Dan Carpenter, linux-kernel@vger.kernel.org
Hi
Oops, sorry.
New patch on the way!
Kind regards
Rickard Strandqvist
2014-10-12 2:27 GMT+02:00 Mark D Rustad <mrustad@gmail.com>:
> On Oct 11, 2014, at 3:36 PM, Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> wrote:
>
>> Changed from using strncpy to strlcpy to simplify the code
>
> Actually you changed from using strncat to strlcat.
>
>> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
>> ---
>> drivers/char/hw_random/core.c | 12 ++++--------
>> 1 file changed, 4 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
>> index aa30a25..1500cfd 100644
>> --- a/drivers/char/hw_random/core.c
>> +++ b/drivers/char/hw_random/core.c
>> @@ -281,7 +281,6 @@ static ssize_t hwrng_attr_available_show(struct device *dev,
>> char *buf)
>> {
>> int err;
>> - ssize_t ret = 0;
>> struct hwrng *rng;
>>
>> err = mutex_lock_interruptible(&rng_mutex);
>> @@ -289,16 +288,13 @@ static ssize_t hwrng_attr_available_show(struct device *dev,
>> return -ERESTARTSYS;
>> buf[0] = '\0';
>> list_for_each_entry(rng, &rng_list, list) {
>> - strncat(buf, rng->name, PAGE_SIZE - ret - 1);
>> - ret += strlen(rng->name);
>> - strncat(buf, " ", PAGE_SIZE - ret - 1);
>> - ret++;
>> + strlcat(buf, rng->name, PAGE_SIZE);
>> + strlcat(buf, " ", PAGE_SIZE);
>> }
>> - strncat(buf, "\n", PAGE_SIZE - ret - 1);
>> - ret++;
>> + strlcat(buf, "\n", PAGE_SIZE);
>> mutex_unlock(&rng_mutex);
>>
>> - return ret;
>> + return strlen(buf);
>> }
>>
>> static DEVICE_ATTR(rng_current, S_IRUGO | S_IWUSR,
>> --
>> 1.7.10.4
>
> --
> Mark Rustad, MRustad@gmail.com
>
^ permalink raw reply [flat|nested] 5+ messages in thread
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2014-10-11 22:36 [PATCH] char: hw_random: core.c: Changed from using strncpy to strlcpy Rickard Strandqvist
2014-10-12 0:27 ` Mark D Rustad
2014-10-12 2:11 ` Guenter Roeck
2014-10-12 2:25 ` Guenter Roeck
2014-10-12 10:32 ` Rickard Strandqvist
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