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 --- arch/m68k/Kconfig.debug | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 arch/m68k/Kconfig.debug (limited to 'arch/m68k/Kconfig.debug') diff --git a/arch/m68k/Kconfig.debug b/arch/m68k/Kconfig.debug new file mode 100644 index 000000000..d036f9038 --- /dev/null +++ b/arch/m68k/Kconfig.debug @@ -0,0 +1,45 @@ +# SPDX-License-Identifier: GPL-2.0 + +config BOOTPARAM + bool "Compiled-in Kernel Boot Parameter" + +config BOOTPARAM_STRING + string "Kernel Boot Parameter" + default "console=ttyS0,19200" + depends on BOOTPARAM + +config EARLY_PRINTK + bool "Early printk" + depends on MMU_MOTOROLA + help + Write kernel log output directly to a serial port. + Where implemented, output goes to the framebuffer as well. + PROM console functionality on Sun 3x is not affected by this option. + + Pass "earlyprintk" on the kernel command line to get a + boot console. + + This is useful for kernel debugging when your machine crashes very + early, i.e. before the normal console driver is loaded. + You should normally say N here, unless you want to debug such a crash. + +if !MMU + +config FULLDEBUG + bool "Full Symbolic/Source Debugging support" + help + Enable debugging symbols on kernel build. + +config HIGHPROFILE + bool "Use fast second timer for profiling" + depends on COLDFIRE + help + Use a fast secondary clock to produce profiling information. + +config BDM_DISABLE + bool "Disable BDM signals" + depends on COLDFIRE + help + Disable the ColdFire CPU's BDM signals. + +endif -- cgit v1.3.1