Date: Fri, 21 Jun 2024 20:43:01 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Jisheng Zhang <jszhang@...nel.org>
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Ard Biesheuvel <ardb@...nel.org>,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-efi@...r.kernel.org
Subject: Re: [PATCH] riscv: enable HAVE_ARCH_STACKLEAK

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@...nel.org>
> > > ---
> > >  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. 

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

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