Accessing Userspace buffer from Kernel space

lyf sci

Genius 3720 points

Hi Experts,

I would like to avoid the usage of API copy_from_user() and copy_to_user() API in my kernel driver.

Is there any means to avoid the copy of data during user space and kernel space interaction ?

over 10 years ago

0 Cvetolin Shulev-XID over 10 years ago

TI__Guru 65405 points

Hi Lyf,
There is a link to useful tutorial about accessing user space memory from the kernel:
www.ibm.com/.../l-kernel-memory-access

BR
Tsvetolin Shulev

0 Shankari G over 10 years ago

TI__Mastermind 43955 points

Hi lyf,

What causes you to think to avoid those APIs?? ( copy_from_user() and copy_to_user())
What is the problem you faced in doing so?

Regards,
Shankari

0 Titusrathinaraj Stalin over 10 years ago

TI__Guru** 116100 points

I think, you can't avoid that API from kernel since lot of drivers are using this mechanism to communicate between kernel and user space.

0 lyf sci over 10 years ago in reply to Shankari G

Genius 3720 points

Hi Shankari,

It is just to save time on doing a duplicate memcopy.

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Accessing Userspace buffer from Kernel space