Hi Ingo,
On Thu, 9 May 2019 11:14:08 +0200
Ingo Molnar wrote:
> * Masami Hiramatsu wrote:
>
> > +static __always_inline long
> > +probe_read_common(void *dst, const void __user *src, size_t size)
> > +{
> > + long ret;
> > +
> > + pagefault_disable();
> > + ret =
* Masami Hiramatsu wrote:
> +static __always_inline long
> +probe_read_common(void *dst, const void __user *src, size_t size)
> +{
> + long ret;
> +
> + pagefault_disable();
> + ret = __copy_from_user_inatomic(dst, src, size);
> + pagefault_enable();
> +
> + return ret ?
Add probe_user_read(), strncpy_from_unsafe_user() and
strnlen_unsafe_user() which allows caller to access user-space
in IRQ context.
Current probe_kernel_read() and strncpy_from_unsafe() are
not available for user-space memory, because it sets
KERNEL_DS while accessing data. On some arch, user
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