1. 13 Sep, 2019 2 commits
  2. 10 Sep, 2019 1 commit
  3. 29 Jul, 2019 1 commit
  4. 09 Jul, 2019 4 commits
  5. 29 Jun, 2019 1 commit
  6. 24 May, 2019 1 commit
  7. 15 Apr, 2019 1 commit
  8. 12 Apr, 2019 1 commit
  9. 20 Mar, 2019 1 commit
    • Xin Long's avatar
      sctp: use memdup_user instead of vmemdup_user · ef82bcfa
      Xin Long authored
      In sctp_setsockopt_bindx()/__sctp_setsockopt_connectx(), it allocates
      memory with addrs_size which is passed from userspace. We used flag
      GFP_USER to put some more restrictions on it in Commit cacc0621
      ("sctp: use GFP_USER for user-controlled kmalloc").
      
      However, since Commit c981f254
      
       ("sctp: use vmemdup_user() rather
      than badly open-coding memdup_user()"), vmemdup_user() has been used,
      which doesn't check GFP_USER flag when goes to vmalloc_*(). So when
      addrs_size is a huge value, it could exhaust memory and even trigger
      oom killer.
      
      This patch is to use memdup_user() instead, in which GFP_USER would
      work to limit the memory allocation with a huge addrs_size.
      
      Note we can't fix it by limiting 'addrs_size', as there's no demand
      for it from RFC.
      
      Reported-by: default avatar <syzbot+ec1b7575afef85a0e5ca@syzkaller.appspotmail.com>
      Fixes: c981f254
      
       ("sctp: use vmemdup_user() rather than badly open-coding memdup_user()")
      Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
      Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ef82bcfa
  10. 19 Mar, 2019 14 commits
  11. 08 Mar, 2019 2 commits
    • Xin Long's avatar
      sctp: call sctp_auth_init_hmacs() in sctp_sock_migrate() · c6f33e05
      Xin Long authored
      
      
      New ep's auth_hmacs should be set if old ep's is set, in case that
      net->sctp.auth_enable has been changed to 0 by users and new ep's
      auth_hmacs couldn't be set in sctp_endpoint_init().
      
      It can even crash kernel by doing:
      
        1. on server: sysctl -w net.sctp.auth_enable=1,
                      sysctl -w net.sctp.addip_enable=1,
                      sysctl -w net.sctp.addip_noauth_enable=0,
                      listen() on server,
                      sysctl -w net.sctp.auth_enable=0.
        2. on client: connect() to server.
        3. on server: accept() the asoc,
                      sysctl -w net.sctp.auth_enable=1.
        4. on client: send() asconf packet to server.
      
      The call trace:
      
        [  245.280251] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
        [  245.286872] RIP: 0010:sctp_auth_calculate_hmac+0xa3/0x140 [sctp]
        [  245.304572] Call Trace:
        [  245.305091]  <IRQ>
        [  245.311287]  sctp_sf_authenticate+0x110/0x160 [sctp]
        [  245.312311]  sctp_sf_eat_auth+0xf2/0x230 [sctp]
        [  245.313249]  sctp_do_sm+0x9a/0x2d0 [sctp]
        [  245.321483]  sctp_assoc_bh_rcv+0xed/0x1a0 [sctp]
        [  245.322495]  sctp_rcv+0xa66/0xc70 [sctp]
      
      It's because the old ep->auth_hmacs wasn't copied to the new ep while
      ep->auth_hmacs is used in sctp_auth_calculate_hmac() when processing
      the incoming auth chunks, and it should have been done when migrating
      sock.
      
      Reported-by: default avatarYing Xu <yinxu@redhat.com>
      Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
      Acked-by: default avatarNeil Horman <nhorman@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c6f33e05
    • Xin Long's avatar
      sctp: sctp_sock_migrate() returns error if sctp_bind_addr_dup() fails · 89664c62
      Xin Long authored
      
      
      It should fail to create the new sk if sctp_bind_addr_dup() fails
      when accepting or peeloff an association.
      
      Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      89664c62
  12. 04 Mar, 2019 1 commit
  13. 01 Feb, 2019 1 commit
  14. 30 Jan, 2019 9 commits