جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one Sashiko notes: > regarding the bounds check in snp_filter_reserved_mem_regions() > called via walk_iomem_res_desc(): does the check > if ((range_list->num_elements * 16 + 8) > PAGE_SIZE) > allow an off-by-one heap buffer overflow? > > If range_list->num_elements is 255, 255 * 16 + 8 = 4088, which is <= 4096. > Writing range->base (8 bytes) fills 4088-4095, but writing range->page_count > (4 bytes) would write to 4096-4099, overflowing the kzalloc-allocated > PAGE_SIZE buffer. Fix this by accounting for the entry about to be written to, in addition to the entries that are already allocated.

• https://git.kernel.org/stable/c/830c1f3e71989448652973375ef5e39b6ede47a3
• https://git.kernel.org/stable/c/c5c79d92da0f9a09f48be5e2aabed2d6d1a96294
• https://git.kernel.org/stable/c/af7341616b742ad2c374a90998bd650a035f694d
• https://git.kernel.org/stable/c/1b864b6cb213bbd7b406e9b2e98c962077f300df