I send related PaX .config if you need it:
# # PaX # CONFIG_ARCH_TRACK_EXEC_LIMIT=y CONFIG_PAX_PER_CPU_PGD=y CONFIG_PAX=y # # PaX Control # CONFIG_PAX_SOFTMODE=y # CONFIG_PAX_EI_PAX is not set CONFIG_PAX_PT_PAX_FLAGS=y # CONFIG_PAX_XATTR_PAX_FLAGS is not set # CONFIG_PAX_NO_ACL_FLAGS is not set CONFIG_PAX_HAVE_ACL_FLAGS=y # CONFIG_PAX_HOOK_ACL_FLAGS is not set # # Non-executable pages # CONFIG_PAX_NOEXEC=y CONFIG_PAX_PAGEEXEC=y # CONFIG_PAX_SEGMEXEC is not set CONFIG_PAX_EMUTRAMP=y CONFIG_PAX_MPROTECT=y # CONFIG_PAX_ELFRELOCS is not set CONFIG_PAX_KERNEXEC=y CONFIG_PAX_KERNEXEC_PLUGIN_METHOD="" # # Address Space Layout Randomization # CONFIG_PAX_ASLR=y CONFIG_PAX_RANDKSTACK=y 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_UDEREF is not set CONFIG_PAX_REFCOUNT=y # CONFIG_PAX_USERCOPY is not set # CONFIG_PAX_CONSTIFY_PLUGIN is not set # CONFIG_PAX_SIZE_OVERFLOW is not set # CONFIG_KEYS is not set CONFIG_SECURITY_DMESG_RESTRICT=y # CONFIG_SECURITY is not set # CONFIG_SECURITYFS is not set CONFIG_DEFAULT_SECURITY_DAC=y CONFIG_DEFAULT_SECURITY="" CONFIG_XOR_BLOCKS=y CONFIG_ASYNC_CORE=y CONFIG_ASYNC_MEMCPY=y CONFIG_ASYNC_XOR=y CONFIG_ASYNC_PQ=y CONFIG_ASYNC_RAID6_RECOV=y CONFIG_CRYPTO=y # 2013/7/15 Javier Juan Martínez Cabezón <[email protected]> > > Hi all > > I'm with this several months and I still without knowing if it was mistake > from me while patching PaX with rsbac at hand or is a kernel bug, or it's > from VirtualBox (the behaviour is horrible, sorry): > > After the bug hits system guest gets unusable, hard reset is required, > every command executed gets segfaulted from there. > > I can reproduce it easily, using backup_all (a shell script that makes the > sec policy backup (as in this case)) or with ./configure when compiling (as > emerge does something), so emerge usually does seg fault. The EIP is always > at the same, strnlen+0x6/0x18 > > Jul 13 22:50:02 orion kernel: BUG: unable to handle kernel paging request > at 00001033 > Jul 13 22:50:02 orion kernel: IP: [<001aa8e2>] strnlen+0x6/0x18 > Jul 13 22:50:02 orion kernel: *pdpt = 000000000e965001 *pde = > 0000000000000000 > Jul 13 22:50:02 orion kernel: Oops: 0000 [#1] > Jul 13 22:50:02 orion kernel: > Jul 13 22:50:02 orion kernel: Pid: 4147, comm: bash Not tainted > 3.4.0-rsbac #9 innotek GmbH VirtualBox > Jul 13 22:50:02 orion kernel: EIP: 0060:[<001aa8e2>] EFLAGS: 00010217 CPU: > 0 > Jul 13 22:50:02 orion kernel: EIP is at strnlen+0x6/0x18 > Jul 13 22:50:02 orion kernel: EAX: 00001033 EBX: ce9c0069 ECX: 00001033 > EDX: 0000000e > Jul 13 22:50:02 orion kernel: ESI: 00001033 EDI: ce9c0069 EBP: ce9c07f5 > ESP: c66d3b38 > Jul 13 22:50:02 orion kernel: DS: 0068 ES: 0068 FS: 0000 GS: 0000 SS: 0068 > Jul 13 22:50:02 orion kernel: CR0: 8005003b CR2: 00001033 CR3: 01415000 > CR4: 000006f0 > Jul 13 22:50:02 orion kernel: DR0: 00000000 DR1: 00000000 DR2: 00000000 > DR3: 00000000 > Jul 13 22:50:02 orion kernel: DR6: ffff0ff0 DR7: 00000400 > Jul 13 22:50:02 orion kernel: Process bash (pid: 4147, ti=e738ee3c > task=e738ebd0 task.ti=e738ee3c) > Jul 13 22:50:02 orion kernel: Stack: > Jul 13 22:50:02 orion kernel: 001a884b c66d3bb4 c66d3bb0 c66d3bb4 ce9c0069 > ce9c0069 001a916e 000fff00 > Jul 13 22:50:02 orion kernel: 000fffff 0000000f ce9c07f5 ce9c000b c1514bcb > 000007ea ff0a0004 000fffff > Jul 13 22:50:02 orion kernel: ce9c0000 c66d3bdc c66d3bac c66d3bdc 0004dfc6 > c66d3ba8 e702a4c0 c66d3bdc > Jul 13 22:50:02 orion kernel: Call Trace: > Jul 13 22:50:02 orion kernel: [<001a884b>] ? string.isra.1+0x25/0x8c > Jul 13 22:50:02 orion kernel: [<001a916e>] ? vsnprintf+0x139/0x257 > Jul 13 22:50:02 orion kernel: [<000fff00>] ? bio_map_user+0x13/0x25 > Jul 13 22:50:02 orion kernel: [<000fffff>] ? bio_map_kern+0xb0/0xd9 > Jul 13 22:50:02 orion kernel: [<000fffff>] ? bio_map_kern+0xb0/0xd9 > Jul 13 22:50:02 orion kernel: [<0004dfc6>] ? rsbac_printk+0x52/0x18e > Jul 13 22:50:02 orion kernel: [<0007d3ee>] ? > rsbac_adf_set_attr_cap+0x680/0x9a6 > Jul 13 22:50:02 orion kernel: [<00038a00>] ? > smp_apic_timer_interrupt+0x62/0x6a > Jul 13 22:50:02 orion kernel: [<00407f91>] ? resume_userspace_sig+0x1b/0x2a > Jul 13 22:50:02 orion kernel: [<0007148e>] ? > rsbac_adf_set_attr+0x45f/0x12b3 > Jul 13 22:50:02 orion kernel: [<00800001>] ? 0x800000 > Jul 13 22:50:02 orion kernel: [<0009fa4f>] ? do_adjtimex+0x2ab/0x550 > Jul 13 22:50:02 orion kernel: [<000e85ec>] ? do_path_lookup+0x17/0x4a > Jul 13 22:50:02 orion kernel: [<000e8963>] ? user_path_at_empty+0x4b/0x69 > Jul 13 22:50:02 orion kernel: [<000e8963>] ? user_path_at_empty+0x4b/0x69 > Jul 13 22:50:02 orion kernel: [<000c6a52>] ? __do_fault+0x357/0x389 > Jul 13 22:50:02 orion kernel: [<0002cc9e>] ? free_thread_xstate+0x17/0x23 > Jul 13 22:50:02 orion kernel: [<00110c60>] ? load_elf_binary+0xf05/0xfbf > Jul 13 22:50:02 orion kernel: [<00110c60>] ? load_elf_binary+0xf05/0xfbf > Jul 13 22:50:02 orion kernel: [<00030502>] ? x86_pmu_event_init+0x23c/0x2d1 > Jul 13 22:50:02 orion kernel: [<000e2f53>] ? do_execve_common+0x363/0x45e > Jul 13 22:50:02 orion kernel: [<00800001>] ? 0x800000 > Jul 13 22:50:02 orion kernel: [<0009fa4f>] ? do_adjtimex+0x2ab/0x550 > Jul 13 22:50:02 orion kernel: [<000e85ec>] ? do_path_lookup+0x17/0x4a > Jul 13 22:50:02 orion kernel: [<000e8963>] ? user_path_at_empty+0x4b/0x69 > Jul 13 22:50:02 orion kernel: [<000e8963>] ? user_path_at_empty+0x4b/0x69 > Jul 13 22:50:02 orion kernel: [<000c6a52>] ? __do_fault+0x357/0x389 > Jul 13 22:50:02 orion kernel: [<00800001>] ? 0x800000 > Jul 13 22:50:02 orion kernel: [<0009fa4f>] ? do_adjtimex+0x2ab/0x550 > Jul 13 22:50:02 orion kernel: [<00800001>] ? 0x800000 > Jul 13 22:50:02 orion kernel: [<0009fa4f>] ? do_adjtimex+0x2ab/0x550 > Jul 13 22:50:02 orion kernel: [<000e85ec>] ? do_path_lookup+0x17/0x4a > Jul 13 22:50:02 orion kernel: [<000e8963>] ? user_path_at_empty+0x4b/0x69 > Jul 13 22:50:02 orion kernel: [<000e8963>] ? user_path_at_empty+0x4b/0x69 > Jul 13 22:50:02 orion kernel: [<00800001>] ? 0x800000 > Jul 13 22:50:02 orion kernel: [<0009fa4f>] ? do_adjtimex+0x2ab/0x550 > Jul 13 22:50:02 orion kernel: [<000c6a52>] ? __do_fault+0x357/0x389 > Jul 13 22:50:02 orion kernel: [<000e626c>] ? getname_flags+0x1b/0xbf > Jul 13 22:50:02 orion kernel: [<000e3057>] ? do_execve+0x9/0xb > Jul 13 22:50:02 orion kernel: [<0002d0f1>] ? sys_execve+0x2c/0x50 > Jul 13 22:50:02 orion kernel: [<004087f2>] ? ptregs_execve+0x12/0x20 > Jul 13 22:50:02 orion kernel: [<00408009>] ? syscall_call+0x7/0xb > Jul 13 22:50:02 orion kernel: [<00408024>] ? restore_all_pax+0x7/0x7 > Jul 13 22:50:02 orion kernel: [<000290d5>] ? math_state_restore+0x96/0x96 > Jul 13 22:50:02 orion kernel: [<00010206>] ? > kvm_arch_vcpu_ioctl_run+0x79a/0xbdc > Jul 13 22:50:02 orion kernel: [<0003c0a9>] ? vmalloc_sync_all+0x1/0x1 > Jul 13 22:50:02 orion kernel: [<00408024>] ? restore_all_pax+0x7/0x7 > Jul 13 22:50:02 orion kernel: [<0040007b>] ? pcnet32_remove_one+0x22/0xe3 > Jul 13 22:50:02 orion kernel: [<0001007b>] ? > kvm_arch_vcpu_ioctl_run+0x60f/0xbdc > Jul 13 22:50:02 orion kernel: [<0003c0a9>] ? vmalloc_sync_all+0x1/0x1 > Jul 13 22:50:02 orion kernel: [<00010287>] ? > kvm_arch_vcpu_ioctl_run+0x81b/0xbdc > Jul 13 22:50:02 orion kernel: Code: d0 f2 ae 74 05 bf 01 00 00 00 4f eb 02 > 31 ff 89 f8 5f c3 85 c9 57 89 c7 74 07 89 d0 f2 ae 75 01 4f 89 f8 5f c3 89 > c1 89 c8 eb 06 <80> 38 00 74 07 40 4a 83 fa ff 75 f4 29 c8 c3 90 90 90 57 > 83 c9 > Jul 13 22:50:02 orion kernel: EIP: [<001aa8e2>] strnlen+0x6/0x18 SS:ESP > 0068:c66d3b38 > Jul 13 22:50:02 orion kernel: CR2: 0000000000001033 > Jul 13 22:50:02 orion kernel: ---[ end trace 4a7d8fa933a5d5dd ]--- > > Jul 13 22:59:01 orion kernel: BUG: unable to handle kernel paging request > at 000010a1 > Jul 13 22:59:01 orion kernel: IP: [<001aa8e2>] strnlen+0x6/0x18 > Jul 13 22:59:01 orion kernel: *pdpt = 000000000df00001 *pde = > 0000000000000000 > Jul 13 22:59:01 orion kernel: Oops: 0000 [#2] > Jul 13 22:59:01 orion kernel: > Jul 13 22:59:01 orion kernel: Pid: 4257, comm: bash Tainted: G D > 3.4.0-rsbac #9 innotek GmbH VirtualBox > Jul 13 22:59:01 orion kernel: EIP: 0060:[<001aa8e2>] EFLAGS: 00010217 CPU: > 0 > Jul 13 22:59:01 orion kernel: EIP is at strnlen+0x6/0x18 > Jul 13 22:59:01 orion kernel: EAX: 000010a1 EBX: ce9c0869 ECX: 000010a1 > EDX: 0000000e > Jul 13 22:59:01 orion kernel: ESI: 000010a1 EDI: ce9c0869 EBP: ce9c0ff5 > ESP: c66cfb48 > Jul 13 22:59:01 orion kernel: DS: 0068 ES: 0068 FS: 0000 GS: 0000 SS: 0068 > Jul 13 22:59:01 orion kernel: CR0: 8005003b CR2: 000010a1 CR3: 01415000 > CR4: 000006f0 > Jul 13 22:59:01 orion kernel: DR0: 00000000 DR1: 00000000 DR2: 00000000 > DR3: 00000000 > Jul 13 22:59:01 orion kernel: DR6: ffff0ff0 DR7: 00000400 > Jul 13 22:59:01 orion kernel: Process bash (pid: 4257, ti=e738ee3c > task=e738ebd0 task.ti=e738ee3c) >
