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/microblaze/Kconfig.platform | 71 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 arch/microblaze/Kconfig.platform (limited to 'arch/microblaze/Kconfig.platform') diff --git a/arch/microblaze/Kconfig.platform b/arch/microblaze/Kconfig.platform new file mode 100644 index 000000000..9cf9007ed --- /dev/null +++ b/arch/microblaze/Kconfig.platform @@ -0,0 +1,71 @@ +# SPDX-License-Identifier: GPL-2.0-only +# For a description of the syntax of this configuration file, +# see Documentation/kbuild/kconfig-language.rst. +# +# Platform selection Kconfig menu for MicroBlaze targets +# + +menu "Platform options" + +config OPT_LIB_FUNCTION + bool "Optimized lib function" + default y + help + Turns on optimized library functions (memcpy and memmove). + They are optimized by using word alignment. This will work + fine if both source and destination are aligned on the same + boundary. However, if they are aligned on different boundaries + shifts will be necessary. This might result in bad performance + on MicroBlaze systems without a barrel shifter. + +config OPT_LIB_ASM + bool "Optimized lib function ASM" + depends on OPT_LIB_FUNCTION && (XILINX_MICROBLAZE0_USE_BARREL = 1) + depends on CPU_BIG_ENDIAN + default n + help + Turns on optimized library functions (memcpy and memmove). + They are written in assembly. + +# Definitions for MICROBLAZE0 +comment "Definitions for MICROBLAZE0" + +config KERNEL_BASE_ADDR + hex "Physical address where Linux Kernel is" + default "0x90000000" + help + BASE Address for kernel + +config XILINX_MICROBLAZE0_FAMILY + string "Targeted FPGA family" + default "virtex5" + +config XILINX_MICROBLAZE0_USE_MSR_INSTR + int "USE_MSR_INSTR range (0:1)" + default 0 + +config XILINX_MICROBLAZE0_USE_PCMP_INSTR + int "USE_PCMP_INSTR range (0:1)" + default 0 + +config XILINX_MICROBLAZE0_USE_BARREL + int "USE_BARREL range (0:1)" + default 0 + +config XILINX_MICROBLAZE0_USE_DIV + int "USE_DIV range (0:1)" + default 0 + +config XILINX_MICROBLAZE0_USE_HW_MUL + int "USE_HW_MUL values (0=NONE, 1=MUL32, 2=MUL64)" + default 0 + +config XILINX_MICROBLAZE0_USE_FPU + int "USE_FPU values (0=NONE, 1=BASIC, 2=EXTENDED)" + default 0 + +config XILINX_MICROBLAZE0_HW_VER + string "Core version number" + default "7.10.d" + +endmenu -- cgit v1.3.1