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/configs/mmu_defconfig | 91 +++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 arch/microblaze/configs/mmu_defconfig (limited to 'arch/microblaze/configs') diff --git a/arch/microblaze/configs/mmu_defconfig b/arch/microblaze/configs/mmu_defconfig new file mode 100644 index 000000000..fbbdcb394 --- /dev/null +++ b/arch/microblaze/configs/mmu_defconfig @@ -0,0 +1,91 @@ +CONFIG_SYSVIPC=y +CONFIG_POSIX_MQUEUE=y +CONFIG_AUDIT=y +CONFIG_IKCONFIG=y +CONFIG_IKCONFIG_PROC=y +CONFIG_EXPERT=y +CONFIG_BASE_SMALL=y +CONFIG_KALLSYMS_ALL=y +CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR=1 +CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR=1 +CONFIG_XILINX_MICROBLAZE0_USE_BARREL=1 +CONFIG_XILINX_MICROBLAZE0_USE_DIV=1 +CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL=2 +CONFIG_XILINX_MICROBLAZE0_USE_FPU=2 +CONFIG_HZ_100=y +CONFIG_CMDLINE_BOOL=y +CONFIG_CMDLINE_FORCE=y +CONFIG_HIGHMEM=y +CONFIG_MODULES=y +CONFIG_MODULE_UNLOAD=y +CONFIG_PARTITION_ADVANCED=y +# CONFIG_EFI_PARTITION is not set +CONFIG_CMA=y +CONFIG_NET=y +CONFIG_PACKET=y +CONFIG_UNIX=y +CONFIG_INET=y +CONFIG_IP_PNP=y +CONFIG_IP_PNP_DHCP=y +CONFIG_IP_PNP_BOOTP=y +CONFIG_IP_PNP_RARP=y +# CONFIG_IPV6 is not set +CONFIG_BRIDGE=m +CONFIG_PCI=y +CONFIG_DEVTMPFS=y +CONFIG_DEVTMPFS_MOUNT=y +CONFIG_MTD=y +CONFIG_MTD_CFI=y +CONFIG_MTD_CFI_INTELEXT=y +CONFIG_MTD_CFI_AMDSTD=y +CONFIG_BLK_DEV_RAM=y +CONFIG_BLK_DEV_RAM_SIZE=8192 +CONFIG_NETDEVICES=y +CONFIG_XILINX_EMACLITE=y +CONFIG_XILINX_AXI_EMAC=y +CONFIG_XILINX_LL_TEMAC=y +CONFIG_MARVELL_PHY=y +# CONFIG_INPUT is not set +# CONFIG_SERIO is not set +# CONFIG_VT is not set +CONFIG_SERIAL_8250=y +CONFIG_SERIAL_8250_CONSOLE=y +CONFIG_SERIAL_OF_PLATFORM=y +CONFIG_SERIAL_UARTLITE=y +CONFIG_SERIAL_UARTLITE_CONSOLE=y +# CONFIG_HW_RANDOM is not set +CONFIG_XILINX_HWICAP=y +CONFIG_I2C=y +CONFIG_I2C_XILINX=y +CONFIG_SPI=y +CONFIG_SPI_XILINX=y +CONFIG_GPIOLIB=y +CONFIG_GPIO_SYSFS=y +CONFIG_GPIO_XILINX=y +CONFIG_POWER_RESET=y +CONFIG_POWER_RESET_GPIO_RESTART=y +# CONFIG_HWMON is not set +CONFIG_WATCHDOG=y +CONFIG_XILINX_WATCHDOG=y +CONFIG_FB=y +CONFIG_FB_XILINX=y +# CONFIG_USB_SUPPORT is not set +CONFIG_UIO=y +CONFIG_UIO_PDRV_GENIRQ=y +CONFIG_UIO_DMEM_GENIRQ=y +CONFIG_EXT4_FS=y +# CONFIG_DNOTIFY is not set +CONFIG_TMPFS=y +CONFIG_CRAMFS=y +CONFIG_ROMFS_FS=y +CONFIG_NFS_FS=y +CONFIG_ROOT_NFS=y +CONFIG_CIFS=y +CONFIG_ENCRYPTED_KEYS=y +CONFIG_DMA_CMA=y +CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y +CONFIG_KGDB=y +CONFIG_KGDB_TESTS=y +CONFIG_KGDB_KDB=y +CONFIG_DETECT_HUNG_TASK=y +CONFIG_DEBUG_SPINLOCK=y -- cgit v1.3.1