On Fri, Jun 21, 2024 at 08:43:01PM -0700, Charlie Jenkins wrote: > On Sat, Jun 22, 2024 at 08:45:16AM +0800, Jisheng Zhang wrote: > > On Fri, Jun 21, 2024 at 03:10:42PM -0700, Charlie Jenkins wrote: > > > On Mon, Jun 17, 2024 at 08:30:29PM +0800, Jisheng Zhang wrote: > > > > Add support for the stackleak feature. Whenever the kernel returns to user > > > > space the kernel stack is filled with a poison value. > > > > > > > > At the same time, disables the plugin in EFI stub code because EFI stub > > > > is out of scope for the protection. > > > > > > > > Tested on qemu and milkv duo: > > > > / # echo STACKLEAK_ERASING > /sys/kernel/debug/provoke-crash/DIRECT > > > > [ 38.675575] lkdtm: Performing direct entry STACKLEAK_ERASING > > > > [ 38.678448] lkdtm: stackleak stack usage: > > > > [ 38.678448] high offset: 288 bytes > > > > [ 38.678448] current: 496 bytes > > > > [ 38.678448] lowest: 1328 bytes > > > > [ 38.678448] tracked: 1328 bytes > > > > [ 38.678448] untracked: 448 bytes > > > > [ 38.678448] poisoned: 14312 bytes > > > > [ 38.678448] low offset: 8 bytes > > > > [ 38.689887] lkdtm: OK: the rest of the thread stack is properly erased > > > > > > > > Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx> > > > > --- > > > > arch/riscv/Kconfig | 1 + > > > > arch/riscv/kernel/entry.S | 4 ++++ > > > > drivers/firmware/efi/libstub/Makefile | 3 ++- > > > > 3 files changed, 7 insertions(+), 1 deletion(-) > > > > > > > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > > > > index 0525ee2d63c7..9cbfdffec96c 100644 > > > > --- a/arch/riscv/Kconfig > > > > +++ b/arch/riscv/Kconfig > > > > @@ -118,6 +118,7 @@ config RISCV > > > > select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT > > > > select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET > > > > select HAVE_ARCH_SECCOMP_FILTER > > > > + select HAVE_ARCH_STACKLEAK > > > > > > When this is selected, stackleak.h include > > > arch/riscv/include/asm/thread_info.h without sizes.h and I hit: > > > > > > ./arch/riscv/include/asm/thread_info.h:30:33: error: ‘SZ_4K’ undeclared here (not in a function) > > > 30 | #define OVERFLOW_STACK_SIZE SZ_4K > > > | ^~~~~ > > > > > > Adding "#include <linux/sizes.h>" to thread_info.h resolves the issue. > > > I am testing this based on 6.10-rc4. Did you encounter this? > > > > I didn't meet this kind of compiler error when testing. Mind > > to share your .config file? It looks strange. > > The .config exceeds the mailing list character limit, but here is the > defconfig created with savedefconfig. It is just defconfig + > CONFIG_GCC_PLUGIN_STACKLEAK with modules removed. I can reproduce the compile error. If disabling VMAP_STACK, the error would disappear. I believe the case can be reproduced under other config combinations but we didn't find it so far ;) I will send a v2. Thanks a lot. > > CONFIG_SYSVIPC=y > CONFIG_POSIX_MQUEUE=y > CONFIG_NO_HZ_IDLE=y > CONFIG_HIGH_RES_TIMERS=y > CONFIG_BPF_SYSCALL=y > CONFIG_IKCONFIG=y > CONFIG_IKCONFIG_PROC=y > CONFIG_CGROUPS=y > CONFIG_MEMCG=y > CONFIG_CGROUP_SCHED=y > CONFIG_CFS_BANDWIDTH=y > CONFIG_RT_GROUP_SCHED=y > CONFIG_CGROUP_PIDS=y > CONFIG_CGROUP_FREEZER=y > CONFIG_CGROUP_HUGETLB=y > CONFIG_CPUSETS=y > CONFIG_CGROUP_DEVICE=y > CONFIG_CGROUP_CPUACCT=y > CONFIG_CGROUP_PERF=y > CONFIG_CGROUP_BPF=y > CONFIG_NAMESPACES=y > CONFIG_USER_NS=y > CONFIG_CHECKPOINT_RESTORE=y > CONFIG_BLK_DEV_INITRD=y > CONFIG_EXPERT=y > # CONFIG_SYSFS_SYSCALL is not set > CONFIG_PROFILING=y > CONFIG_ARCH_MICROCHIP=y > CONFIG_ARCH_RENESAS=y > CONFIG_ARCH_SIFIVE=y > CONFIG_ARCH_SOPHGO=y > CONFIG_SOC_STARFIVE=y > CONFIG_ARCH_SUNXI=y > CONFIG_ARCH_THEAD=y > CONFIG_ARCH_VIRT=y > CONFIG_ARCH_CANAAN=y > CONFIG_SMP=y > CONFIG_CPU_FREQ=y > CONFIG_CPU_FREQ_STAT=y > CONFIG_CPU_FREQ_GOV_USERSPACE=y > CONFIG_CPU_FREQ_GOV_ONDEMAND=y > CONFIG_CPUFREQ_DT=y > CONFIG_VIRTUALIZATION=y > CONFIG_ACPI=y > CONFIG_JUMP_LABEL=y > CONFIG_MODULES=y > CONFIG_MODULE_UNLOAD=y > CONFIG_SPARSEMEM_MANUAL=y > CONFIG_NET=y > CONFIG_PACKET=y > CONFIG_IP_MULTICAST=y > CONFIG_IP_ADVANCED_ROUTER=y > CONFIG_IP_PNP=y > CONFIG_IP_PNP_DHCP=y > CONFIG_IP_PNP_BOOTP=y > CONFIG_IP_PNP_RARP=y > CONFIG_NETFILTER=y > CONFIG_NET_SCHED=y > CONFIG_NETLINK_DIAG=y > CONFIG_NET_L3_MASTER_DEV=y > CONFIG_CGROUP_NET_PRIO=y > CONFIG_CGROUP_NET_CLASSID=y > CONFIG_NET_9P=y > CONFIG_NET_9P_VIRTIO=y > CONFIG_PCI=y > CONFIG_PCIEPORTBUS=y > CONFIG_PCI_HOST_GENERIC=y > CONFIG_PCIE_XILINX=y > CONFIG_PCIE_FU740=y > CONFIG_DEVTMPFS=y > CONFIG_DEVTMPFS_MOUNT=y > CONFIG_MTD=y > CONFIG_MTD_BLOCK=y > CONFIG_MTD_CFI=y > CONFIG_MTD_CFI_ADV_OPTIONS=y > CONFIG_MTD_SPI_NOR=y > CONFIG_BLK_DEV_LOOP=y > CONFIG_VIRTIO_BLK=y > CONFIG_BLK_DEV_SD=y > CONFIG_BLK_DEV_SR=y > CONFIG_SCSI_VIRTIO=y > CONFIG_ATA=y > CONFIG_SATA_AHCI=y > CONFIG_SATA_AHCI_PLATFORM=y > CONFIG_MD=y > CONFIG_NETDEVICES=y > CONFIG_VIRTIO_NET=y > CONFIG_MACB=y > CONFIG_E1000E=y > CONFIG_R8169=y > CONFIG_RAVB=y > CONFIG_MICREL_PHY=y > CONFIG_MICROSEMI_PHY=y > CONFIG_INPUT_MOUSEDEV=y > CONFIG_SERIAL_8250=y > CONFIG_SERIAL_8250_CONSOLE=y > CONFIG_SERIAL_8250_DW=y > CONFIG_SERIAL_OF_PLATFORM=y > CONFIG_SERIAL_EARLYCON_RISCV_SBI=y > CONFIG_SERIAL_SH_SCI=y > CONFIG_VIRTIO_CONSOLE=y > CONFIG_HW_RANDOM=y > CONFIG_HW_RANDOM_VIRTIO=y > CONFIG_SPI=y > CONFIG_SPI_SIFIVE=y > CONFIG_SPI_SUN6I=y > # CONFIG_PTP_1588_CLOCK is not set > CONFIG_GPIO_SIFIVE=y > CONFIG_CPU_THERMAL=y > CONFIG_RZG2L_THERMAL=y > CONFIG_WATCHDOG=y > CONFIG_SUNXI_WATCHDOG=y > CONFIG_RENESAS_RZG2LWDT=y > CONFIG_REGULATOR=y > CONFIG_REGULATOR_FIXED_VOLTAGE=y > CONFIG_REGULATOR_GPIO=y > CONFIG_FB=y > CONFIG_FRAMEBUFFER_CONSOLE=y > CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y > CONFIG_SOUND=y > CONFIG_SND=y > CONFIG_SND_SOC=y > CONFIG_USB=y > CONFIG_USB_OTG=y > CONFIG_USB_XHCI_HCD=y > CONFIG_USB_XHCI_PLATFORM=y > CONFIG_USB_EHCI_HCD=y > CONFIG_USB_EHCI_HCD_PLATFORM=y > CONFIG_USB_OHCI_HCD=y > CONFIG_USB_OHCI_HCD_PLATFORM=y > CONFIG_USB_STORAGE=y > CONFIG_USB_UAS=y > CONFIG_USB_GADGET=y > CONFIG_MMC=y > CONFIG_MMC_SDHCI=y > CONFIG_MMC_SDHCI_PLTFM=y > CONFIG_MMC_SDHCI_OF_DWCMSHC=y > CONFIG_MMC_SDHCI_CADENCE=y > CONFIG_MMC_SPI=y > CONFIG_MMC_SDHI=y > CONFIG_MMC_DW=y > CONFIG_MMC_DW_STARFIVE=y > CONFIG_MMC_SUNXI=y > CONFIG_RTC_CLASS=y > CONFIG_RTC_DRV_SUN6I=y > CONFIG_DMADEVICES=y > CONFIG_DW_AXI_DMAC=y > CONFIG_SYNC_FILE=y > CONFIG_VIRTIO_PCI=y > CONFIG_VIRTIO_BALLOON=y > CONFIG_VIRTIO_INPUT=y > CONFIG_VIRTIO_MMIO=y > CONFIG_CLK_SOPHGO_CV1800=y > # CONFIG_CLK_STARFIVE_JH7100_AUDIO is not set > # CONFIG_CLK_STARFIVE_JH7110_AON is not set > # CONFIG_CLK_STARFIVE_JH7110_STG is not set > # CONFIG_CLK_STARFIVE_JH7110_ISP is not set > # CONFIG_CLK_STARFIVE_JH7110_VOUT is not set > # CONFIG_SUN8I_DE2_CCU is not set > CONFIG_RENESAS_OSTM=y > CONFIG_MAILBOX=y > CONFIG_PCC=y > CONFIG_SUN50I_IOMMU=y > CONFIG_RPMSG_CHAR=y > CONFIG_RPMSG_CTRL=y > CONFIG_RPMSG_VIRTIO=y > CONFIG_EXTCON=y > CONFIG_IIO=y > CONFIG_PHY_RCAR_GEN3_USB2=y > CONFIG_LIBNVDIMM=y > CONFIG_NVMEM_SUNXI_SID=y > CONFIG_EXT4_FS=y > CONFIG_EXT4_FS_POSIX_ACL=y > CONFIG_EXT4_FS_SECURITY=y > CONFIG_AUTOFS_FS=y > CONFIG_ISO9660_FS=y > CONFIG_JOLIET=y > CONFIG_ZISOFS=y > CONFIG_MSDOS_FS=y > CONFIG_VFAT_FS=y > CONFIG_TMPFS=y > CONFIG_TMPFS_POSIX_ACL=y > CONFIG_HUGETLBFS=y > # CONFIG_EFIVAR_FS is not set > CONFIG_NFS_FS=y > CONFIG_NFS_V4=y > CONFIG_NFS_V4_1=y > CONFIG_NFS_V4_2=y > CONFIG_ROOT_NFS=y > CONFIG_9P_FS=y > CONFIG_NLS_CODEPAGE_437=y > CONFIG_SECURITY=y > CONFIG_SECURITY_SELINUX=y > CONFIG_SECURITY_APPARMOR=y > CONFIG_DEFAULT_SECURITY_DAC=y > CONFIG_GCC_PLUGIN_STACKLEAK=y > CONFIG_CRYPTO_USER_API_HASH=y > CONFIG_CRYPTO_DEV_VIRTIO=y > CONFIG_PRINTK_TIME=y > CONFIG_DEBUG_FS=y > CONFIG_DEBUG_PAGEALLOC=y > CONFIG_SCHED_STACK_END_CHECK=y > CONFIG_DEBUG_VM=y > CONFIG_DEBUG_VM_PGFLAGS=y > CONFIG_DEBUG_MEMORY_INIT=y > CONFIG_DEBUG_PER_CPU_MAPS=y > CONFIG_SOFTLOCKUP_DETECTOR=y > CONFIG_WQ_WATCHDOG=y > CONFIG_DEBUG_TIMEKEEPING=y > CONFIG_DEBUG_RT_MUTEXES=y > CONFIG_DEBUG_SPINLOCK=y > CONFIG_DEBUG_MUTEXES=y > CONFIG_DEBUG_RWSEMS=y > CONFIG_DEBUG_ATOMIC_SLEEP=y > CONFIG_DEBUG_LIST=y > CONFIG_DEBUG_PLIST=y > CONFIG_DEBUG_SG=y > # CONFIG_RCU_TRACE is not set > CONFIG_RCU_EQS_DEBUG=y > # CONFIG_FTRACE is not set > # CONFIG_RUNTIME_TESTING_MENU is not set > CONFIG_MEMTEST=y >
