Re: [gentoo-hardened] Problem with (?) hardened-sources-3.15.x on kvm-vm

[Alex Xu]

On 26/08/14 06:23 AM, Marcin Mirosław wrote:
> Hello!
> I suspect that I've got problem with hardened-sources in KVM VM. I'm not
> sure if I should fill a bug for this. I'd like to post it here before
> using b.g.o.
> I've got VM (it's KVM with qemu-2.0.0-r1), with
> hardened-sources-3.15.{5-r2,8}. I'm observing a kind of memory
> corruption. After a couple of hours of uptime I'm starting seeing random
> segfaults, general protection traps especially when process uses a lot
> of CPU and do many I/O operations (masscheck scripts written in perl for
> spamassasin rules).
> In log I've got e.g.:
>
> 2014-08-25T13:05:23.243062+02:00 mohikanin kernel: [45571.239703] PAX:
> From 88.198.102.195: execution attempt in: (null), 00000000-00000000
> 00000000
> 2014-08-25T13:05:23.243088+02:00 mohikanin kernel: [45571.239707] PAX:
> terminating task: /usr/libexec/dovecot/pop3-login(pop3-login):2507,
> uid/euid: 105/105, PC:            (nil), SP: 000003a8574e4c00
> 2014-08-25T13:05:23.243093+02:00 mohikanin kernel: [45571.239709] PAX:
> bytes at PC: ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??
> 2014-08-25T13:05:23.243095+02:00 mohikanin kernel: [45571.239735] PAX:
> bytes at SP-8: 0000000000000000 0000000000000000 00000059c6deceb0
> 0000000000000000 00000316027bc540 0000000000000001 000003160271dbb5
> 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> 2014-08-25T13:24:42.943001+02:00 mohikanin kernel: [46730.931353] traps:
> spamd child[19681] general protection ip:2c572b6e163 sp:3ca7d000be0
> error:0 in libc-2.19.so[2c572aee000+19e000]
> 2014-08-25T13:24:42.943007+02:00 mohikanin kernel: [46730.931371] grsec:
> Segmentation fault occurred at            (nil) in /usr/sbin/spamd[spamd
> child:19681] uid/euid:999/999 gid/egid:100/100, parent
> /usr/sbin/spamd[/usr/sbin/spamd:1255] uid/euid:0/0 gid/egid:0/0
> 2014-08-25T13:55:22.383032+02:00 mohikanin kernel: [48570.375917] traps:
> freshclam[6594] general protection ip:344cceb368d sp:3d5f5ced520 error:0
> in libclamav.so.6.1.23[344ccdf1000+9d1000]
> 2014-08-25T13:55:22.383050+02:00 mohikanin kernel: [48570.375968] grsec:
> Segmentation fault occurred at            (nil) in
> /usr/bin/freshclam[freshclam:6594] uid/euid:104/104 gid/egid:115/115,
> parent /usr/bin/freshclam[freshclam:1159] uid/euid:104/104 gid/egid:115/115
>
> Yesterday I switched kernel to gentoo-sources-3.14.14 and I don't see
> any unwanted behavior. This is why I suspect hardened-sources. Should I
> fill a bug? What should I do help find out the root of problem?
> (gcc is: gcc version 4.7.3 (Gentoo Hardened 4.7.3-r1 p1.4, pie-0.5.5) ,
> with ld.gold)

I've also been having similar issues with
sys-kernel/hardened-sources-3.15.{5-r[12],10-r1}, manifesting typically
as malloc/free errors in python, bash, or gcc, but particularly in g++.
No MAC, just PaX.

$ grep 'GRK|PAX' /boot/config
CONFIG_PAX_KERNEXEC_PLUGIN=y
CONFIG_PAX_PER_CPU_PGD=y
CONFIG_PAX_USERCOPY_SLABS=y
CONFIG_GRKERNSEC=y
# CONFIG_GRKERNSEC_CONFIG_AUTO is not set
CONFIG_GRKERNSEC_CONFIG_CUSTOM=y
CONFIG_PAX=y
# CONFIG_PAX_SOFTMODE is not set
CONFIG_PAX_PT_PAX_FLAGS=y
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
CONFIG_PAX_NOEXEC=y
CONFIG_PAX_PAGEEXEC=y
CONFIG_PAX_EMUTRAMP=y
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=y
CONFIG_PAX_KERNEXEC_PLUGIN_METHOD="bts"
CONFIG_PAX_ASLR=y
CONFIG_PAX_RANDKSTACK=y
CONFIG_PAX_RANDUSTACK=y
CONFIG_PAX_RANDMMAP=y
# 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
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_KSTACKOVERFLOW is not set
# CONFIG_GRKERNSEC_BRUTE is not set
CONFIG_GRKERNSEC_HIDESYM=y
CONFIG_GRKERNSEC_RANDSTRUCT=y
CONFIG_GRKERNSEC_RANDSTRUCT_PERFORMANCE=y
CONFIG_GRKERNSEC_KERN_LOCKOUT=y
CONFIG_GRKERNSEC_NO_RBAC=y
CONFIG_GRKERNSEC_ACL_HIDEKERN=y
CONFIG_GRKERNSEC_ACL_MAXTRIES=3
CONFIG_GRKERNSEC_ACL_TIMEOUT=30
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=y
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_AUDIT_GROUP is not set
# CONFIG_GRKERNSEC_EXECLOG is not set
# CONFIG_GRKERNSEC_RESLOG is not set
# 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 is not set
# CONFIG_GRKERNSEC_FORKFAIL is not set
# CONFIG_GRKERNSEC_TIME is not set
# CONFIG_GRKERNSEC_PROC_IPADDR is not set
CONFIG_GRKERNSEC_RWXMAP_LOG=y
CONFIG_GRKERNSEC_DMESG=y
CONFIG_GRKERNSEC_HARDEN_PTRACE=y
CONFIG_GRKERNSEC_PTRACE_READEXEC=y
CONFIG_GRKERNSEC_SETXID=y
CONFIG_GRKERNSEC_HARDEN_IPC=y
# CONFIG_GRKERNSEC_TPE is not set
CONFIG_GRKERNSEC_RANDNET=y
# CONFIG_GRKERNSEC_BLACKHOLE is not set
CONFIG_GRKERNSEC_NO_SIMULT_CONNECT=y
# CONFIG_GRKERNSEC_SOCKET is not set
CONFIG_GRKERNSEC_SYSCTL=y
# CONFIG_GRKERNSEC_SYSCTL_DISTRO is not set
CONFIG_GRKERNSEC_SYSCTL_ON=y
CONFIG_GRKERNSEC_FLOODTIME=10
CONFIG_GRKERNSEC_FLOODBURST=6