Re: [gentoo-hardened] Weird coincidental PAX crashes

[Michael Orlitzky]

On 05/09/2014 11:29 AM, Mark Gomersbach wrote:
> Maybe a bug somewhere else too, which combination kernel/grsec/pax was used?
>

Whatever came with sys-kernel/hardened-sources-3.11.7-r1:

  # uname -a
  Linux mmmc2 3.11.7-hardened-r1 #1 SMP Fri Jan 3 23:13:48 EST 2014
  x86_64 Intel(R) Xeon(R) CPU 5160 @ 3.00GHz GenuineIntel GNU/Linux

Here's the hardened portion of the kernel .config for the web server
that blew up today. The config for the mail server should be almost
identical. I maintain the kernel configs for different hardware in
different repos, but unless I've made a mistake, the hardening options
should be the same.


#
# Security options
#

#
# Grsecurity
#
CONFIG_PAX_KERNEXEC_PLUGIN=y
CONFIG_PAX_PER_CPU_PGD=y
CONFIG_TASK_SIZE_MAX_SHIFT=42
CONFIG_PAX_USERCOPY_SLABS=y
CONFIG_GRKERNSEC=y
# CONFIG_GRKERNSEC_CONFIG_AUTO is not set
CONFIG_GRKERNSEC_CONFIG_CUSTOM=y

#
# Customize Configuration
#

#
# PaX
#
CONFIG_PAX=y

#
# PaX Control
#
# CONFIG_PAX_SOFTMODE is not set
# CONFIG_PAX_PT_PAX_FLAGS is not set
CONFIG_PAX_XATTR_PAX_FLAGS=y
CONFIG_PAX_NO_ACL_FLAGS=y
# CONFIG_PAX_HAVE_ACL_FLAGS is not set
# CONFIG_PAX_HOOK_ACL_FLAGS is not set

#
# Non-executable pages
#
CONFIG_PAX_NOEXEC=y
CONFIG_PAX_PAGEEXEC=y
# CONFIG_PAX_EMUTRAMP is not set
CONFIG_PAX_MPROTECT=y
# CONFIG_PAX_MPROTECT_COMPAT is not set
# CONFIG_PAX_ELFRELOCS is not set
CONFIG_PAX_KERNEXEC=y
# CONFIG_PAX_KERNEXEC_PLUGIN_METHOD_BTS is not set
CONFIG_PAX_KERNEXEC_PLUGIN_METHOD_OR=y
CONFIG_PAX_KERNEXEC_PLUGIN_METHOD="or"

#
# Address Space Layout Randomization
#
CONFIG_PAX_ASLR=y
# CONFIG_PAX_RANDKSTACK is not set
CONFIG_PAX_RANDUSTACK=y
CONFIG_PAX_RANDMMAP=y

#
# Miscellaneous hardening features
#
# CONFIG_PAX_MEMORY_SANITIZE is not set
# CONFIG_PAX_MEMORY_STACKLEAK is not set
CONFIG_PAX_MEMORY_STRUCTLEAK=y
CONFIG_PAX_MEMORY_UDEREF=y
CONFIG_PAX_REFCOUNT=y
CONFIG_PAX_CONSTIFY_PLUGIN=y
CONFIG_PAX_USERCOPY=y
# CONFIG_PAX_USERCOPY_DEBUG is not set
CONFIG_PAX_SIZE_OVERFLOW=y
# CONFIG_PAX_LATENT_ENTROPY is not set

#
# Memory Protections
#
CONFIG_GRKERNSEC_KMEM=y
CONFIG_GRKERNSEC_IO=y
CONFIG_GRKERNSEC_PERF_HARDEN=y
CONFIG_GRKERNSEC_RAND_THREADSTACK=y
CONFIG_GRKERNSEC_PROC_MEMMAP=y
CONFIG_GRKERNSEC_BRUTE=y
CONFIG_GRKERNSEC_MODHARDEN=y
# CONFIG_GRKERNSEC_HIDESYM is not set
# CONFIG_GRKERNSEC_KERN_LOCKOUT is not set

#
# Role Based Access Control Options
#
CONFIG_GRKERNSEC_NO_RBAC=y
# CONFIG_GRKERNSEC_ACL_HIDEKERN is not set
CONFIG_GRKERNSEC_ACL_MAXTRIES=3
CONFIG_GRKERNSEC_ACL_TIMEOUT=30

#
# Filesystem Protections
#
CONFIG_GRKERNSEC_PROC=y
CONFIG_GRKERNSEC_PROC_USER=y
CONFIG_GRKERNSEC_PROC_ADD=y
CONFIG_GRKERNSEC_LINK=y
# CONFIG_GRKERNSEC_SYMLINKOWN is not set
CONFIG_GRKERNSEC_FIFO=y
CONFIG_GRKERNSEC_SYSFS_RESTRICT=y
# CONFIG_GRKERNSEC_ROFS is not set
CONFIG_GRKERNSEC_DEVICE_SIDECHANNEL=y
CONFIG_GRKERNSEC_CHROOT=y
CONFIG_GRKERNSEC_CHROOT_MOUNT=y
CONFIG_GRKERNSEC_CHROOT_DOUBLE=y
CONFIG_GRKERNSEC_CHROOT_PIVOT=y
CONFIG_GRKERNSEC_CHROOT_CHDIR=y
CONFIG_GRKERNSEC_CHROOT_CHMOD=y
CONFIG_GRKERNSEC_CHROOT_FCHDIR=y
CONFIG_GRKERNSEC_CHROOT_MKNOD=y
CONFIG_GRKERNSEC_CHROOT_SHMAT=y
CONFIG_GRKERNSEC_CHROOT_UNIX=y
CONFIG_GRKERNSEC_CHROOT_FINDTASK=y
CONFIG_GRKERNSEC_CHROOT_NICE=y
CONFIG_GRKERNSEC_CHROOT_SYSCTL=y
CONFIG_GRKERNSEC_CHROOT_CAPS=y
# CONFIG_GRKERNSEC_CHROOT_INITRD is not set

#
# Kernel Auditing
#
# CONFIG_GRKERNSEC_AUDIT_GROUP is not set
# CONFIG_GRKERNSEC_EXECLOG is not set
CONFIG_GRKERNSEC_RESLOG=y
# CONFIG_GRKERNSEC_CHROOT_EXECLOG is not set
# CONFIG_GRKERNSEC_AUDIT_PTRACE is not set
# CONFIG_GRKERNSEC_AUDIT_CHDIR is not set
# CONFIG_GRKERNSEC_AUDIT_MOUNT is not set
CONFIG_GRKERNSEC_SIGNAL=y
CONFIG_GRKERNSEC_FORKFAIL=y
# CONFIG_GRKERNSEC_TIME is not set
CONFIG_GRKERNSEC_PROC_IPADDR=y
CONFIG_GRKERNSEC_RWXMAP_LOG=y

#
# Executable Protections
#
CONFIG_GRKERNSEC_DMESG=y
CONFIG_GRKERNSEC_HARDEN_PTRACE=y
CONFIG_GRKERNSEC_PTRACE_READEXEC=y
# CONFIG_GRKERNSEC_SETXID is not set
# CONFIG_GRKERNSEC_TPE is not set

#
# Network Protections
#
CONFIG_GRKERNSEC_RANDNET=y
# CONFIG_GRKERNSEC_BLACKHOLE is not set
CONFIG_GRKERNSEC_NO_SIMULT_CONNECT=y
# CONFIG_GRKERNSEC_SOCKET is not set

#
# Physical Protections
#
# CONFIG_GRKERNSEC_DENYUSB is not set

#
# Sysctl Support
#
# CONFIG_GRKERNSEC_SYSCTL is not set

#
# Logging Options
#
CONFIG_GRKERNSEC_FLOODTIME=1
CONFIG_GRKERNSEC_FLOODBURST=4
# CONFIG_KEYS is not set
CONFIG_SECURITY_DMESG_RESTRICT=y
CONFIG_SECURITY=y
# CONFIG_SECURITYFS is not set
# CONFIG_SECURITY_NETWORK is not set
# CONFIG_SECURITY_PATH is not set
# CONFIG_INTEL_TXT is not set
# CONFIG_SECURITY_SMACK is not set
# CONFIG_SECURITY_TOMOYO is not set
# CONFIG_SECURITY_APPARMOR is not set
# CONFIG_IMA is not set