Hi,
first which rsbac version you are using.
Appears this bug also when you try the rsbac-sources without pax?
Jens
Am 2013-07-15 03:07, schrieb Javier Juan Martínez Cabezón:
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)
