在 2024/1/20 20:22, Erick Archer 写道:
> As noted in the "Deprecated Interfaces, Language Features, Attributes,
> and Conventions" documentation [1], size calculations (especially
> multiplication) should not be performed in memory allocator (or similar)
> function arguments due to the risk of them overflowing. This could lead
> to values wrapping around and a smaller allocation being made than the
> caller was expecting. Using those allocations could lead to linear
> overflows of heap memory and other misbehaviors.
>
> So, in the example code use the purpose specific kcalloc() function
> instead of the argument size * count in the kzalloc() function.
>
> Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
> Link: https://github.com/KSPP/linux/issues/162
> Signed-off-by: Erick Archer <[email protected]>
> ---
> Documentation/translations/zh_CN/power/opp.rst | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Documentation/translations/zh_CN/power/opp.rst b/Documentation/translations/zh_CN/power/opp.rst
> index 8d6e3f6f6202..7470fa2d4c43 100644
> --- a/Documentation/translations/zh_CN/power/opp.rst
> +++ b/Documentation/translations/zh_CN/power/opp.rst
> @@ -274,7 +274,7 @@ dev_pm_opp_get_opp_count
> {
> /* 做一些事情 */
> num_available = dev_pm_opp_get_opp_count(dev);
> - speeds = kzalloc(sizeof(u32) * num_available, GFP_KERNEL);
> + speeds = kcalloc(num_available, sizeof(u32), GFP_KERNEL);
If the translated version is modified, I think the original file should
follow as well at Documentation/power/opp.rst line 308:
diff --git a/Documentation/power/opp.rst b/Documentation/power/opp.rst
index a7c03c470980..dca35018214a 100644
--- a/Documentation/power/opp.rst
+++ b/Documentation/power/opp.rst
@@ -305,7 +305,7 @@ dev_pm_opp_get_opp_count
{
/* Do things */
num_available = dev_pm_opp_get_opp_count(dev);
- speeds = kzalloc(sizeof(u32) * num_available, GFP_KERNEL);
+ speeds = kcalloc(sizeof(u32) * num_available, GFP_KERNEL);
/* populate the table in increasing order */
freq = 0;
while (!IS_ERR(opp = dev_pm_opp_find_freq_ceil(dev,
&freq))) {
Thanks,
Hu Haowen
> /* 按升序填充表 */
> freq = 0;
> while (!IS_ERR(opp = dev_pm_opp_find_freq_ceil(dev, &freq))) {
> --
> 2.25.1
>
>
>
Hi Hu and Jonathan,
On Sat, Jan 20, 2024 at 10:24:42PM +0800, Hu Haowen wrote:
>
> 在 2024/1/20 20:22, Erick Archer 写道:
> > As noted in the "Deprecated Interfaces, Language Features, Attributes,
> > and Conventions" documentation [1], size calculations (especially
> > multiplication) should not be performed in memory allocator (or similar)
> > function arguments due to the risk of them overflowing. This could lead
> > to values wrapping around and a smaller allocation being made than the
> > caller was expecting. Using those allocations could lead to linear
> > overflows of heap memory and other misbehaviors.
> >
> > So, in the example code use the purpose specific kcalloc() function
> > instead of the argument size * count in the kzalloc() function.
> >
> > Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
> > Link: https://github.com/KSPP/linux/issues/162
> > Signed-off-by: Erick Archer <[email protected]>
> > ---
> > Documentation/translations/zh_CN/power/opp.rst | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/Documentation/translations/zh_CN/power/opp.rst b/Documentation/translations/zh_CN/power/opp.rst
> > index 8d6e3f6f6202..7470fa2d4c43 100644
> > --- a/Documentation/translations/zh_CN/power/opp.rst
> > +++ b/Documentation/translations/zh_CN/power/opp.rst
> > @@ -274,7 +274,7 @@ dev_pm_opp_get_opp_count
> > {
> > /* 做一些事情 */
> > num_available = dev_pm_opp_get_opp_count(dev);
> > - speeds = kzalloc(sizeof(u32) * num_available, GFP_KERNEL);
> > + speeds = kcalloc(num_available, sizeof(u32), GFP_KERNEL);
>
>
> If the translated version is modified, I think the original file should
> follow as well at Documentation/power/opp.rst line 308:
>
> diff --git a/Documentation/power/opp.rst b/Documentation/power/opp.rst
> index a7c03c470980..dca35018214a 100644
> --- a/Documentation/power/opp.rst
> +++ b/Documentation/power/opp.rst
> @@ -305,7 +305,7 @@ dev_pm_opp_get_opp_count
> {
> /* Do things */
> num_available = dev_pm_opp_get_opp_count(dev);
> - speeds = kzalloc(sizeof(u32) * num_available, GFP_KERNEL);
> + speeds = kcalloc(sizeof(u32) * num_available, GFP_KERNEL);
> /* populate the table in increasing order */
> freq = 0;
> while (!IS_ERR(opp = dev_pm_opp_find_freq_ceil(dev, &freq)))
> {
As you both suggested, this change should be made if the original file is
changed. Therefore, before this patch I already sent another one [1] that
made the proposed changes to the original file.
[1] https://lore.kernel.org/linux-hardening/[email protected]/
But if you prefer, I can send just one patch with the two changes.
Best regards,
Erick
>
> Thanks,
> Hu Haowen
>
>
> > /* 按升序填充表 */
> > freq = 0;
> > while (!IS_ERR(opp = dev_pm_opp_find_freq_ceil(dev, &freq))) {
> > --
> > 2.25.1
> >
> >
> >