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KFunc bpf_copy_from_user_str_dynptr

v6.16

Sleepable, copies user-space string into a dynptr for the current task

Definition

Signature

int bpf_copy_from_user_str_dynptr(struct bpf_dynptr *dptr, u32 off, u32 size, const void *unsafe_ptr__ign)

Note

This function may sleep, and therefore can only be used from sleepable programs.

Usage

This kfunc can be used to probe a string from kernel memory directly into a dynptr buffer. The max size of which can be dynamic (not known at verification time).

Program types

The following program types can make use of this kfunc:

Example

Docs could be improved

This part of the docs is incomplete, contributions are very welcome