1. 03 Jan, 2006 4 commits
    • Trent Jaeger's avatar
      [LSM-IPSec]: Per-packet access control. · d28d1e08
      Trent Jaeger authored
      This patch series implements per packet access control via the
      extension of the Linux Security Modules (LSM) interface by hooks in
      the XFRM and pfkey subsystems that leverage IPSec security
      associations to label packets.  Extensions to the SELinux LSM are
      included that leverage the patch for this purpose.
      
      This patch implements the changes necessary to the SELinux LSM to
      create, deallocate, and use security contexts for policies
      (xfrm_policy) and security associations (xfrm_state) that enable
      control of a socket's ability to send and receive packets.
      
      Patch purpose:
      
      The patch is designed to enable the SELinux LSM to implement access
      control on individual packets based on the strongly authenticated
      IPSec security association.  Such access controls augment the existing
      ones in SELinux based on network interface and IP address.  The former
      are very coarse-grained, and the latter can be spoofed.  By using
      IPSec, the SELinux can control access to remote hosts based on
      cryptographic keys generated using the IPSec mechanism.  This enables
      access control on a per-machine basis or per-application if the remote
      machine is running the same mechanism and trusted to enforce the
      access control policy.
      
      Patch design approach:
      
      The patch's main function is to authorize a socket's access to a IPSec
      policy based on their security contexts.  Since the communication is
      implemented by a security association, the patch ensures that the
      security association's negotiated and used have the same security
      context.  The patch enables allocation and deallocation of such
      security contexts for policies and security associations.  It also
      enables copying of the security context when policies are cloned.
      Lastly, the patch ensures that packets that are sent without using a
      IPSec security assocation with a security context are allowed to be
      sent in that manner.
      
      A presentation available at
      www.selinux-symposium.org/2005/presentations/session2/2-3-jaeger.pdf
      from the SELinux symposium describes the overall approach.
      
      Patch implementation details:
      
      The function which authorizes a socket to perform a requested
      operation (send/receive) on a IPSec policy (xfrm_policy) is
      selinux_xfrm_policy_lookup.  The Netfilter and rcv_skb hooks ensure
      that if a IPSec SA with a securit y association has not been used,
      then the socket is allowed to send or receive the packet,
      respectively.
      
      The patch implements SELinux function for allocating security contexts
      when policies (xfrm_policy) are created via the pfkey or xfrm_user
      interfaces via selinux_xfrm_policy_alloc.  When a security association
      is built, SELinux allocates the security context designated by the
      XFRM subsystem which is based on that of the authorized policy via
      selinux_xfrm_state_alloc.
      
      When a xfrm_policy is cloned, the security context of that policy, if
      any, is copied to the clone via selinux_xfrm_policy_clone.
      
      When a xfrm_policy or xfrm_state is freed, its security context, if
      any is also freed at selinux_xfrm_policy_free or
      selinux_xfrm_state_free.
      
      Testing:
      
      The SELinux authorization function is tested using ipsec-tools.  We
      created policies and security associations with particular security
      contexts and added SELinux access control policy entries to verify the
      authorization decision.  We also made sure that packets for which no
      security context was supplied (which either did or did not use
      security associations) were authorized using an unlabelled context.
      Signed-off-by: default avatarTrent Jaeger <tjaeger@cse.psu.edu>
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d28d1e08
    • Trent Jaeger's avatar
      [LSM-IPSec]: Security association restriction. · df71837d
      Trent Jaeger authored
      This patch series implements per packet access control via the
      extension of the Linux Security Modules (LSM) interface by hooks in
      the XFRM and pfkey subsystems that leverage IPSec security
      associations to label packets.  Extensions to the SELinux LSM are
      included that leverage the patch for this purpose.
      
      This patch implements the changes necessary to the XFRM subsystem,
      pfkey interface, ipv4/ipv6, and xfrm_user interface to restrict a
      socket to use only authorized security associations (or no security
      association) to send/receive network packets.
      
      Patch purpose:
      
      The patch is designed to enable access control per packets based on
      the strongly authenticated IPSec security association.  Such access
      controls augment the existing ones based on network interface and IP
      address.  The former are very coarse-grained, and the latter can be
      spoofed.  By using IPSec, the system can control access to remote
      hosts based on cryptographic keys generated using the IPSec mechanism.
      This enables access control on a per-machine basis or per-application
      if the remote machine is running the same mechanism and trusted to
      enforce the access control policy.
      
      Patch design approach:
      
      The overall approach is that policy (xfrm_policy) entries set by
      user-level programs (e.g., setkey for ipsec-tools) are extended with a
      security context that is used at policy selection time in the XFRM
      subsystem to restrict the sockets that can send/receive packets via
      security associations (xfrm_states) that are built from those
      policies.
      
      A presentation available at
      www.selinux-symposium.org/2005/presentations/session2/2-3-jaeger.pdf
      from the SELinux symposium describes the overall approach.
      
      Patch implementation details:
      
      On output, the policy retrieved (via xfrm_policy_lookup or
      xfrm_sk_policy_lookup) must be authorized for the security context of
      the socket and the same security context is required for resultant
      security association (retrieved or negotiated via racoon in
      ipsec-tools).  This is enforced in xfrm_state_find.
      
      On input, the policy retrieved must also be authorized for the socket
      (at __xfrm_policy_check), and the security context of the policy must
      also match the security association being used.
      
      The patch has virtually no impact on packets that do not use IPSec.
      The existing Netfilter (outgoing) and LSM rcv_skb hooks are used as
      before.
      
      Also, if IPSec is used without security contexts, the impact is
      minimal.  The LSM must allow such policies to be selected for the
      combination of socket and remote machine, but subsequent IPSec
      processing proceeds as in the original case.
      
      Testing:
      
      The pfkey interface is tested using the ipsec-tools.  ipsec-tools have
      been modified (a separate ipsec-tools patch is available for version
      0.5) that supports assignment of xfrm_policy entries and security
      associations with security contexts via setkey and the negotiation
      using the security contexts via racoon.
      
      The xfrm_user interface is tested via ad hoc programs that set
      security contexts.  These programs are also available from me, and
      contain programs for setting, getting, and deleting policy for testing
      this interface.  Testing of sa functions was done by tracing kernel
      behavior.
      Signed-off-by: default avatarTrent Jaeger <tjaeger@cse.psu.edu>
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      df71837d
    • Linus Torvalds's avatar
      Linux v2.6.15 · 88026842
      Linus Torvalds authored
      Hey, it's fifteen years today since I bought the machine that got Linux
      started.  January 2nd is a good date.
      88026842
    • Andi Kleen's avatar
      [PATCH] Make sure interleave masks have at least one node set · 8f493d79
      Andi Kleen authored
      Otherwise a bad mem policy system call can confuse the interleaving
      code into referencing undefined nodes.
      
      Originally reported by Doug Chapman
      
      I was told it's CVE-2005-3358
      (one has to love these security people - they make everything sound important)
      Signed-off-by: default avatarAndi Kleen <ak@suse.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      8f493d79
  2. 02 Jan, 2006 2 commits
    • Dag-Erling Smrgrav's avatar
      [PATCH] Avoid namespace pollution in <asm/param.h> · abe842eb
      Dag-Erling Smrgrav authored
      In commit 3D59121003721a8fad11ee72e646fd9d3076b5679c, the x86 and x86-64
      <asm/param.h> was changed to include <linux/config.h> for the
      configurable timer frequency.
      
      However, asm/param.h is sometimes used in userland (it is included
      indirectly from <sys/param.h>), so your commit pollutes the userland
      namespace with tons of CONFIG_FOO macros.  This greatly confuses
      software packages (such as BusyBox) which use CONFIG_FOO macros
      themselves to control the inclusion of optional features.
      
      After a short exchange, Christoph approved this patch
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      abe842eb
    • Benjamin Herrenschmidt's avatar
      [PATCH] powerpc: more g5 overtemp problem fix · f12f4d90
      Benjamin Herrenschmidt authored
      Some G5s still occasionally experience shutdowns due to overtemp
      conditions despite the recent fix. After analyzing logs from such
      machines, it appears that the overtemp code is a bit too quick at
      shutting the machine down when reaching the critical temperature (tmax +
      8) and doesn't leave the fan enough time to actually cool it down. This
      happens if the temperature of a CPU suddenly rises too high in a very
      short period of time, or occasionally on boot (that is the CPUs are
      already overtemp by the time the driver loads).
      
      This patches makes the code a bit more relaxed, leaving a few seconds to
      the fans to do their job before kicking the machine shutown.
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      f12f4d90
  3. 01 Jan, 2006 2 commits
  4. 31 Dec, 2005 3 commits
    • Linus Torvalds's avatar
      35f349ee
    • Yi Yang's avatar
      [PATCH] Fix false old value return of sysctl · 82c9df82
      Yi Yang authored
      For the sysctl syscall, if the user wants to get the old value of a
      sysctl entry and set a new value for it in the same syscall, the old
      value is always overwritten by the new value if the sysctl entry is of
      string type and if the user sets its strategy to sysctl_string.  This
      issue lies in the strategy being run twice if the strategy is set to
      sysctl_string, the general strategy sysctl_string always returns 0 if
      success.
      
      Such strategy routines as sysctl_jiffies and sysctl_jiffies_ms return 1
      because they do read and write for the sysctl entry.
      
      The strategy routine sysctl_string return 0 although it actually read
      and write the sysctl entry.
      
      According to my analysis, if a strategy routine do read and write, it
      should return 1, if it just does some necessary check but not read and
      write, it should return 0, for example sysctl_intvec.
      Signed-off-by: default avatarYi Yang <yang.y.yi@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      82c9df82
    • Linus Torvalds's avatar
      sysctl: don't overflow the user-supplied buffer with '\0' · 8febdd85
      Linus Torvalds authored
      If the string was too long to fit in the user-supplied buffer,
      the sysctl layer would zero-terminate it by writing past the
      end of the buffer. Don't do that.
      
      Noticed by Yi Yang <yang.y.yi@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      8febdd85
  5. 30 Dec, 2005 5 commits
  6. 29 Dec, 2005 14 commits
  7. 28 Dec, 2005 6 commits
  8. 27 Dec, 2005 4 commits
    • David L Stevens's avatar
      [IPV6] mcast: Fix multiple issues in MLDv2 reports. · 5ab4a6c8
      David L Stevens authored
      The below "jumbo" patch fixes the following problems in MLDv2.
      
      1) Add necessary "ntohs" to recent "pskb_may_pull" check [breaks
              all nonzero source queries on little-endian (!)]
      
      2) Add locking to source filter list [resend of prior patch]
      
      3) fix "mld_marksources()" to
              a) send nothing when all queried sources are excluded
              b) send full exclude report when source queried sources are
                      not excluded
              c) don't schedule a timer when there's nothing to report
      
      NOTE: RFC 3810 specifies the source list should be saved and each
        source reported individually as an IS_IN. This is an obvious DOS
        path, requiring the host to store and then multicast as many sources
        as are queried (e.g., millions...). This alternative sends a full, 
        relevant report that's limited to number of sources present on the
        machine.
      
      4) fix "add_grec()" to send empty-source records when it should
              The original check doesn't account for a non-empty source
              list with all sources inactive; the new code keeps that
              short-circuit case, and also generates the group header
              with an empty list if needed.
      
      5) fix mca_crcount decrement to be after add_grec(), which needs
              its original value
      
      These issues (other than item #1 ;-) ) were all found by Yan Zheng,
      much thanks!
      Signed-off-by: default avatarDavid L Stevens <dlstevens@us.ibm.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5ab4a6c8
    • David S. Miller's avatar
      [NET]: Validate socket filters against BPF_MAXINSNS in one spot. · 1b93ae64
      David S. Miller authored
      Currently the checks are scattered all over and this leads
      to inconsistencies and even cases where the check is not made.
      
      Based upon a patch from Kris Katterjohn.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1b93ae64
    • YOSHIFUJI Hideaki's avatar
      [IPV6]: Fix addrconf dead lock. · 6732bade
      YOSHIFUJI Hideaki authored
      We need to release idev->lcok before we call addrconf_dad_stop().
      It calls ipv6_addr_del(), which will hold idev->lock.
      
      Bug spotted by Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>.
      Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6732bade
    • Russell King's avatar
      [SERIAL] Fix AMBA PL011 sysrq character handling · a710ce08
      Russell King authored
      We only want the received character without the status bits for
      sysrq handling.
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      a710ce08