From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- drivers/video/fbdev/carminefb.h | 65 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 drivers/video/fbdev/carminefb.h (limited to 'drivers/video/fbdev/carminefb.h') diff --git a/drivers/video/fbdev/carminefb.h b/drivers/video/fbdev/carminefb.h new file mode 100644 index 000000000..c9825481d --- /dev/null +++ b/drivers/video/fbdev/carminefb.h @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef CARMINE_CARMINE_H +#define CARMINE_CARMINE_H + +#define CARMINE_MEMORY_BAR 2 +#define CARMINE_CONFIG_BAR 3 + +#define MAX_DISPLAY 2 +#define CARMINE_DISPLAY_MEM (800 * 600 * 4) +#define CARMINE_TOTAL_DISPLAY_MEM (CARMINE_DISPLAY_MEM * MAX_DISPLAY) + +#define CARMINE_USE_DISPLAY0 (1 << 0) +#define CARMINE_USE_DISPLAY1 (1 << 1) + +/* + * This values work on the eval card. Custom boards may use different timings, + * here an example :) + */ + +/* DRAM initialization values */ +#ifdef CONFIG_FB_CARMINE_DRAM_EVAL + +#define CARMINE_DFLT_IP_CLOCK_ENABLE (0x03ff) +#define CARMINE_DFLT_IP_DCTL_ADD (0x05c3) +#define CARMINE_DFLT_IP_DCTL_MODE (0x0121) +#define CARMINE_DFLT_IP_DCTL_EMODE (0x8000) +#define CARMINE_DFLT_IP_DCTL_SET_TIME1 (0x4749) +#define CARMINE_DFLT_IP_DCTL_SET_TIME2 (0x2a22) +#define CARMINE_DFLT_IP_DCTL_REFRESH (0x0042) +#define CARMINE_DFLT_IP_DCTL_STATES (0x0003) +#define CARMINE_DFLT_IP_DCTL_RESERVE0 (0x0020) +#define CARMINE_DFLT_IP_DCTL_FIFO_DEPTH (0x000f) +#define CARMINE_DFLT_IP_DCTL_RESERVE2 (0x0000) +#define CARMINE_DFLT_IP_DCTL_DDRIF1 (0x6646) +#define CARMINE_DFLT_IP_DCTL_DDRIF2 (0x0055) +#define CARMINE_DFLT_IP_DCTL_MODE_AFT_RST (0x0021) +#define CARMINE_DFLT_IP_DCTL_STATES_AFT_RST (0x0002) +#define CARMINE_DFLT_IP_DCTL_IO_CONT0 (0x0555) +#define CARMINE_DFLT_IP_DCTL_IO_CONT1 (0x0555) +#define CARMINE_DCTL_DLL_RESET (1) +#endif + +#ifdef CONFIG_CARMINE_DRAM_CUSTOM + +#define CARMINE_DFLT_IP_CLOCK_ENABLE (0x03ff) +#define CARMINE_DFLT_IP_DCTL_ADD (0x03b2) +#define CARMINE_DFLT_IP_DCTL_MODE (0x0161) +#define CARMINE_DFLT_IP_DCTL_EMODE (0x8000) +#define CARMINE_DFLT_IP_DCTL_SET_TIME1 (0x2628) +#define CARMINE_DFLT_IP_DCTL_SET_TIME2 (0x1a09) +#define CARMINE_DFLT_IP_DCTL_REFRESH (0x00fe) +#define CARMINE_DFLT_IP_DCTL_STATES (0x0003) +#define CARMINE_DFLT_IP_DCTL_RESERVE0 (0x0020) +#define CARMINE_DFLT_IP_DCTL_FIFO_DEPTH (0x000f) +#define CARMINE_DFLT_IP_DCTL_RESERVE2 (0x0000) +#define CARMINE_DFLT_IP_DCTL_DDRIF1 (0x0646) +#define CARMINE_DFLT_IP_DCTL_DDRIF2 (0x55aa) +#define CARMINE_DFLT_IP_DCTL_MODE_AFT_RST (0x0061) +#define CARMINE_DFLT_IP_DCTL_STATES_AFT_RST (0x0002) +#define CARMINE_DFLT_IP_DCTL_IO_CONT0 (0x0555) +#define CARMINE_DFLT_IP_DCTL_IO_CONT1 (0x0555) +#define CARMINE_DCTL_DLL_RESET (1) +#endif + +#endif -- cgit v1.3.1