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  1. 28 Sep, 2018 25 commits
  3. 24 Sep, 2018 4 commits
    • Stefan Bader's avatar
      UBUNTU: Ubuntu-4.4.0-137.163 · f299608c
      Stefan Bader authored 
      Signed-off-by: default avatarStefan Bader <stefan.bader@canonical.com>
      f299608c
    • Vincent Pelletier's avatar
      iscsi target: Use hex2bin instead of a re-implementation · 5772cc87
      Vincent Pelletier authored 
      This change has the following effects, in order of descreasing importance:
1) Prevent a stack buffer overflow.
2) Do not append an unnecessary NULL to an anyway binary buffer, which
   is writing one byte past client_digest when caller is:
     chap_string_to_hex(client_digest, chap_r, strlen(chap_r));

The latter was found by KASAN (see below) when input value hes expected
size (32 hex chars), and further analysis revealed a stack buffer overflow
can  happen when network-received value is longer, allowing an
unauthenticated remote attacker to smash up to 17 bytes after destination
buffer (16 bytes attacker-controlled and one null).
As switching to hex2bin requires specifying destination buffer length, and
does not internally append any null, it solves both issues.

This addresses CVE-2018-14633.

Beyond this:
- Validate received value length and check hex2bin accepted the input, to
  log this rejection reason instead of just failing authentication.
- Only log received CHAP_R and CHAP_C values once they passed sanity
  checks.

==================================================================
BUG: KASAN: stack-out-of-bounds in chap_string_to_hex+0x32/0x60 [iscsi_target_mod]
Write of size 1 at addr ffff8801090ef7c8 by task kworker/0:0/1021

CPU: 0 PID: 1021 Comm: kworker/0:0 Tainted: G           O      4.17.8kasan.sess.connops+ #2
Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 05/19/2014
Workqueue: events iscsi_target_do_login_rx [iscsi_target_mod]
Call Trace:
 dump_stack+0x71/0xac
 print_address_description+0x65/0x22e
 ? chap_string_to_hex+0x32/0x60 [iscsi_target_mod]
 kasan_report.cold.6+0x241/0x2fd
 chap_string_to_hex+0x32/0x60 [iscsi_target_mod]
 chap_server_compute_md5.isra.2+0x2cb/0x860 [iscsi_target_mod]
 ? chap_binaryhex_to_asciihex.constprop.5+0x50/0x50 [iscsi_target_mod]
 ? ftrace_caller_op_ptr+0xe/0xe
 ? __orc_find+0x6f/0xc0
 ? unwind_next_frame+0x231/0x850
 ? kthread+0x1a0/0x1c0
 ? ret_from_fork+0x35/0x40
 ? ret_from_fork+0x35/0x40
 ? iscsi_target_do_login_rx+0x3bc/0x4c0 [iscsi_target_mod]
 ? deref_stack_reg+0xd0/0xd0
 ? iscsi_target_do_login_rx+0x3bc/0x4c0 [iscsi_target_mod]
 ? is_module_text_address+0xa/0x11
 ? kernel_text_address+0x4c/0x110
 ? __save_stack_trace+0x82/0x100
 ? ret_from_fork+0x35/0x40
 ? save_stack+0x8c/0xb0
 ? 0xffffffffc1660000
 ? iscsi_target_do_login+0x155/0x8d0 [iscsi_target_mod]
 ? iscsi_target_do_login_rx+0x3bc/0x4c0 [iscsi_target_mod]
 ? process_one_work+0x35c/0x640
 ? worker_thread+0x66/0x5d0
 ? kthread+0x1a0/0x1c0
 ? ret_from_fork+0x35/0x40
 ? iscsi_update_param_value+0x80/0x80 [iscsi_target_mod]
 ? iscsit_release_cmd+0x170/0x170 [iscsi_target_mod]
 chap_main_loop+0x172/0x570 [iscsi_target_mod]
 ? chap_server_compute_md5.isra.2+0x860/0x860 [iscsi_target_mod]
 ? rx_data+0xd6/0x120 [iscsi_target_mod]
 ? iscsit_print_session_params+0xd0/0xd0 [iscsi_target_mod]
 ? cyc2ns_read_begin.part.2+0x90/0x90
 ? _raw_spin_lock_irqsave+0x25/0x50
 ? memcmp+0x45/0x70
 iscsi_target_do_login+0x875/0x8d0 [iscsi_target_mod]
 ? iscsi_target_check_first_request.isra.5+0x1a0/0x1a0 [iscsi_target_mod]
 ? del_timer+0xe0/0xe0
 ? memset+0x1f/0x40
 ? flush_sigqueue+0x29/0xd0
 iscsi_target_do_login_rx+0x3bc/0x4c0 [iscsi_target_mod]
 ? iscsi_target_nego_release+0x80/0x80 [iscsi_target_mod]
 ? iscsi_target_restore_sock_callbacks+0x130/0x130 [iscsi_target_mod]
 process_one_work+0x35c/0x640
 worker_thread+0x66/0x5d0
 ? flush_rcu_work+0x40/0x40
 kthread+0x1a0/0x1c0
 ? kthread_bind+0x30/0x30
 ret_from_fork+0x35/0x40

The buggy address belongs to the page:
page:ffffea0004243bc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x17fffc000000000()
raw: 017fffc000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: ffffea0004243c20 ffffea0004243ba0 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801090ef680: f2 f2 f2 f2 f2 f2 f2 01 f2 f2 f2 f2 f2 f2 f2 00
 ffff8801090ef700: f2 f2 f2 f2 f2 f2 f2 00 02 f2 f2 f2 f2 f2 f2 00
>ffff8801090ef780: 00 f2 f2 f2 f2 f2 f2 00 00 f2 f2 f2 f2 f2 f2 00
                                              ^
 ffff8801090ef800: 00 f2 f2 f2 f2 f2 f2 00 00 00 00 02 f2 f2 f2 f2
 ffff8801090ef880: f2 f2 f2 00 00 00 00 00 00 00 00 f2 f2 f2 f2 00
==================================================================
Signed-off-by: default avatarVincent Pelletier <plr.vincent@gmail.com>

CVE-2018-14633
Signed-off-by: default avatarTyler Hicks <tyhicks@canonical.com>
Signed-off-by: default avatarStefan Bader <stefan.bader@canonical.com>
      5772cc87
    • Linus Torvalds's avatar
      mm: get rid of vmacache_flush_all() entirely · 7ed926e6
      Linus Torvalds authored 
      Jann Horn points out that the vmacache_flush_all() function is not only
potentially expensive, it's buggy too.  It also happens to be entirely
unnecessary, because the sequence number overflow case can be avoided by
simply making the sequence number be 64-bit.  That doesn't even grow the
data structures in question, because the other adjacent fields are
already 64-bit.

So simplify the whole thing by just making the sequence number overflow
case go away entirely, which gets rid of all the complications and makes
the code faster too.  Win-win.

[ Oleg Nesterov points out that the VMACACHE_FULL_FLUSHES statistics
  also just goes away entirely with this ]
Reported-by: default avatarJann Horn <jannh@google.com>
Suggested-by: default avatarWill Deacon <will.deacon@arm.com>
Acked-by: default avatarDavidlohr Bueso <dave@stgolabs.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: stable@kernel.org
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>

CVE-2018-17182

(backported from commit 7a9cdebd)
Signed-off-by: default avatarTyler Hicks <tyhicks@canonical.com>
Signed-off-by: default avatarStefan Bader <stefan.bader@canonical.com>
      7ed926e6
    • Stefan Bader's avatar
      UBUNTU: Start new release · fff97d72
      Stefan Bader authored 
      Ignore: yes
Signed-off-by: default avatarStefan Bader <stefan.bader@canonical.com>
      fff97d72
  5. 11 Sep, 2018 7 commits
  7. 10 Sep, 2018 4 commits
    • Peter Zijlstra's avatar
      x86/paravirt: Fix spectre-v2 mitigations for paravirt guests · 14493b56
      Peter Zijlstra authored 
      CVE-2018-15594

Nadav reported that on guests we're failing to rewrite the indirect
calls to CALLEE_SAVE paravirt functions. In particular the
pv_queued_spin_unlock() call is left unpatched and that is all over the
place. This obviously wrecks Spectre-v2 mitigation (for paravirt
guests) which relies on not actually having indirect calls around.

The reason is an incorrect clobber test in paravirt_patch_call(); this
function rewrites an indirect call with a direct call to the _SAME_
function, there is no possible way the clobbers can be different
because of this.

Therefore remove this clobber check. Also put WARNs on the other patch
failure case (not enough room for the instruction) which I've not seen
trigger in my (limited) testing.

Three live kernel image disassemblies for lock_sock_nested (as a small
function that illustrates the problem nicely). PRE is the current
situation for guests, POST is with this patch applied and NATIVE is with
or without the patch for !guests.

PRE:

(gdb) disassemble lock_sock_nested
Dump of assembler code for function lock_sock_nested:
   0xffffffff817be970 <+0>:     push   %rbp
   0xffffffff817be971 <+1>:     mov    %rdi,%rbp
   0xffffffff817be974 <+4>:     push   %rbx
   0xffffffff817be975 <+5>:     lea    0x88(%rbp),%rbx
   0xffffffff817be97c <+12>:    callq  0xffffffff819f7160 <_cond_resched>
   0xffffffff817be981 <+17>:    mov    %rbx,%rdi
   0xffffffff817be984 <+20>:    callq  0xffffffff819fbb00 <_raw_spin_lock_bh>
   0xffffffff817be989 <+25>:    mov    0x8c(%rbp),%eax
   0xffffffff817be98f <+31>:    test   %eax,%eax
   0xffffffff817be991 <+33>:    jne    0xffffffff817be9ba <lock_sock_nested+74>
   0xffffffff817be993 <+35>:    movl   $0x1,0x8c(%rbp)
   0xffffffff817be99d <+45>:    mov    %rbx,%rdi
   0xffffffff817be9a0 <+48>:    callq  *0xffffffff822299e8
   0xffffffff817be9a7 <+55>:    pop    %rbx
   0xffffffff817be9a8 <+56>:    pop    %rbp
   0xffffffff817be9a9 <+57>:    mov    $0x200,%esi
   0xffffffff817be9ae <+62>:    mov    $0xffffffff817be993,%rdi
   0xffffffff817be9b5 <+69>:    jmpq   0xffffffff81063ae0 <__local_bh_enable_ip>
   0xffffffff817be9ba <+74>:    mov    %rbp,%rdi
   0xffffffff817be9bd <+77>:    callq  0xffffffff817be8c0 <__lock_sock>
   0xffffffff817be9c2 <+82>:    jmp    0xffffffff817be993 <lock_sock_nested+35>
End of assembler dump.

POST:

(gdb) disassemble lock_sock_nested
Dump of assembler code for function lock_sock_nested:
   0xffffffff817be970 <+0>:     push   %rbp
   0xffffffff817be971 <+1>:     mov    %rdi,%rbp
   0xffffffff817be974 <+4>:     push   %rbx
   0xffffffff817be975 <+5>:     lea    0x88(%rbp),%rbx
   0xffffffff817be97c <+12>:    callq  0xffffffff819f7160 <_cond_resched>
   0xffffffff817be981 <+17>:    mov    %rbx,%rdi
   0xffffffff817be984 <+20>:    callq  0xffffffff819fbb00 <_raw_spin_lock_bh>
   0xffffffff817be989 <+25>:    mov    0x8c(%rbp),%eax
   0xffffffff817be98f <+31>:    test   %eax,%eax
   0xffffffff817be991 <+33>:    jne    0xffffffff817be9ba <lock_sock_nested+74>
   0xffffffff817be993 <+35>:    movl   $0x1,0x8c(%rbp)
   0xffffffff817be99d <+45>:    mov    %rbx,%rdi
   0xffffffff817be9a0 <+48>:    callq  0xffffffff810a0c20 <__raw_callee_save___pv_queued_spin_unlock>
   0xffffffff817be9a5 <+53>:    xchg   %ax,%ax
   0xffffffff817be9a7 <+55>:    pop    %rbx
   0xffffffff817be9a8 <+56>:    pop    %rbp
   0xffffffff817be9a9 <+57>:    mov    $0x200,%esi
   0xffffffff817be9ae <+62>:    mov    $0xffffffff817be993,%rdi
   0xffffffff817be9b5 <+69>:    jmpq   0xffffffff81063aa0 <__local_bh_enable_ip>
   0xffffffff817be9ba <+74>:    mov    %rbp,%rdi
   0xffffffff817be9bd <+77>:    callq  0xffffffff817be8c0 <__lock_sock>
   0xffffffff817be9c2 <+82>:    jmp    0xffffffff817be993 <lock_sock_nested+35>
End of assembler dump.

NATIVE:

(gdb) disassemble lock_sock_nested
Dump of assembler code for function lock_sock_nested:
   0xffffffff817be970 <+0>:     push   %rbp
   0xffffffff817be971 <+1>:     mov    %rdi,%rbp
   0xffffffff817be974 <+4>:     push   %rbx
   0xffffffff817be975 <+5>:     lea    0x88(%rbp),%rbx
   0xffffffff817be97c <+12>:    callq  0xffffffff819f7160 <_cond_resched>
   0xffffffff817be981 <+17>:    mov    %rbx,%rdi
   0xffffffff817be984 <+20>:    callq  0xffffffff819fbb00 <_raw_spin_lock_bh>
   0xffffffff817be989 <+25>:    mov    0x8c(%rbp),%eax
   0xffffffff817be98f <+31>:    test   %eax,%eax
   0xffffffff817be991 <+33>:    jne    0xffffffff817be9ba <lock_sock_nested+74>
   0xffffffff817be993 <+35>:    movl   $0x1,0x8c(%rbp)
   0xffffffff817be99d <+45>:    mov    %rbx,%rdi
   0xffffffff817be9a0 <+48>:    movb   $0x0,(%rdi)
   0xffffffff817be9a3 <+51>:    nopl   0x0(%rax)
   0xffffffff817be9a7 <+55>:    pop    %rbx
   0xffffffff817be9a8 <+56>:    pop    %rbp
   0xffffffff817be9a9 <+57>:    mov    $0x200,%esi
   0xffffffff817be9ae <+62>:    mov    $0xffffffff817be993,%rdi
   0xffffffff817be9b5 <+69>:    jmpq   0xffffffff81063ae0 <__local_bh_enable_ip>
   0xffffffff817be9ba <+74>:    mov    %rbp,%rdi
   0xffffffff817be9bd <+77>:    callq  0xffffffff817be8c0 <__lock_sock>
   0xffffffff817be9c2 <+82>:    jmp    0xffffffff817be993 <lock_sock_nested+35>
End of assembler dump.

Fixes: 63f70270 ("[PATCH] i386: PARAVIRT: add common patching machinery")
Fixes: 3010a066 ("x86/paravirt, objtool: Annotate indirect calls")
Reported-by: default avatarNadav Amit <namit@vmware.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarJuergen Gross <jgross@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: stable@vger.kernel.org
(cherry picked from commit 5800dc5c)
Signed-off-by: default avatarKleber Sacilotto de Souza <kleber.souza@canonical.com>
Acked-by: default avatarTyler Hicks <tyhicks@canonical.com>
Acked-by: default avatarStefan Bader <stefan.bader@canonical.com>
Signed-off-by: default avatarKleber Sacilotto de Souza <kleber.souza@canonical.com>
      14493b56
    • Greg Kroah-Hartman's avatar
      Linux 4.4.144 · e3f1595b
      Greg Kroah-Hartman authored 
      BugLink: https://bugs.launchpad.net/bugs/1791080Signed-off-by: default avatarStefan Bader <stefan.bader@canonical.com>
Signed-off-by: default avatarKleber Sacilotto de Souza <kleber.souza@canonical.com>
      e3f1595b
    • Sascha Hauer's avatar
      ubi: fastmap: Erase outdated anchor PEBs during attach · b986efbe
      Sascha Hauer authored 
      BugLink: https://bugs.launchpad.net/bugs/1791080

commit f78e5623 upstream.

The fastmap update code might erase the current fastmap anchor PEB
in case it doesn't find any new free PEB. When a power cut happens
in this situation we must not have any outdated fastmap anchor PEB
on the device, because that would be used to attach during next
boot.
The easiest way to make that sure is to erase all outdated fastmap
anchor PEBs synchronously during attach.
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: default avatarRichard Weinberger <richard@nod.at>
Fixes: dbb7d2a8 ("UBI: Add fastmap core")
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarStefan Bader <stefan.bader@canonical.com>
Signed-off-by: default avatarKleber Sacilotto de Souza <kleber.souza@canonical.com>
      b986efbe
    • Richard Weinberger's avatar
      ubi: Fix Fastmap's update_vol() · b5902a56
      Richard Weinberger authored 
      BugLink: https://bugs.launchpad.net/bugs/1791080

commit f7d11b33 upstream.

Usually Fastmap is free to consider every PEB in one of the pools
as newer than the existing PEB. Since PEBs in a pool are by definition
newer than everything else.
But update_vol() missed the case that a pool can contain more than
one candidate.

Cc: <stable@vger.kernel.org>
Fixes: dbb7d2a8 ("UBI: Add fastmap core")
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
Reviewed-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarStefan Bader <stefan.bader@canonical.com>
Signed-off-by: default avatarKleber Sacilotto de Souza <kleber.souza@canonical.com>
      b5902a56
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