ring-buffer: Fix the sub-buffer array base in rb_meta_subbuf_idx()

Overview

In the Linux kernel, the following vulnerability has been resolved:

ring-buffer: Fix the sub-buffer array base in rb_meta_subbuf_idx()

On a persistent ring buffer, rb_meta_subbuf_idx() can return an index one sub-buffer too high. rb_setup_ids_meta_page() then fills subbuf_ids[] shifted by one and leaves subbuf_ids[0] NULL, which __rb_map_vma() dereferences when userspace maps trace_pipe_raw. rb_update_meta_reader() writes two such indices into meta->buffers[], which rb_cpu_meta_valid() would reject on the next boot, discarding the previous boot's trace.

A CPU's sub-buffer array starts after its meta header and the nr_subbufs integers that follow, aligned up to a sub-buffer. rb_meta_subbuf_idx() inverts that calculation but skips only the integers, not the header, so its base is one sub-buffer low whenever the omitted header size crosses the alignment boundary.

Invert the calculation with rb_subbufs_from_meta() rather than repeating it. rb_range_buffer() maps an index back to an address through the same helper, so the two directions can no longer disagree.

Affected

• Linux >= b14d032973d4e6c36e025e96ea3437de53d072d9 < 2f1248b728b56d583ea454fedf239550c49f7b18
• Linux >= b14d032973d4e6c36e025e96ea3437de53d072d9 < 7469b3585ef5f65840d467d2caa811a9098c84b9
• Linux >= b14d032973d4e6c36e025e96ea3437de53d072d9 < 25132363c723afc39aace8b098f547ab4a0ea759
• Linux 6.12

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.