On 2021/08/31 15:48, Geert Uytterhoeven wrote: > Furthermore, this restricts the virtual frame buffer size on 64-bit, > too, while graphics cards can have much more than 4 GiB of RAM. Excuse me, but do you mean that some hardware allows allocating more than UINT_MAX bytes of memory for kernel frame buffer drivers? > IMHO that should be fixed in vga16fb, too. According to https://elixir.bootlin.com/linux/v5.14/A/ident/fb_check_var , there are 89 files. Randomly picking up drivers/video/fbdev/udlfb.c as an example. dlfb_is_valid_mode() from dlfb_ops_check_var() is doing if (mode->xres * mode->yres > dlfb->sku_pixel_limit) return 0; return 1; where max dlfb->sku_pixel_limit seems to be 2048 * 1152 but I think we need same overflow check. I want to avoid patching individual modules if possible. That depends on whether some hardware needs to allocate more than UINT_MAX bytes of memory.
