1. 26 Mar, 2014 1 commit
  2. 16 Jan, 2014 1 commit
  3. 31 Oct, 2013 2 commits
  4. 07 Oct, 2013 1 commit
    • Alexei Starovoitov's avatar
      net: fix unsafe set_memory_rw from softirq · d45ed4a4
      Alexei Starovoitov authored
      
      
      on x86 system with net.core.bpf_jit_enable = 1
      
      sudo tcpdump -i eth1 'tcp port 22'
      
      causes the warning:
      [   56.766097]  Possible unsafe locking scenario:
      [   56.766097]
      [   56.780146]        CPU0
      [   56.786807]        ----
      [   56.793188]   lock(&(&vb->lock)->rlock);
      [   56.799593]   <Interrupt>
      [   56.805889]     lock(&(&vb->lock)->rlock);
      [   56.812266]
      [   56.812266]  *** DEADLOCK ***
      [   56.812266]
      [   56.830670] 1 lock held by ksoftirqd/1/13:
      [   56.836838]  #0:  (rcu_read_lock){.+.+..}, at: [<ffffffff8118f44c>] vm_unmap_aliases+0x8c/0x380
      [   56.849757]
      [   56.849757] stack backtrace:
      [   56.862194] CPU: 1 PID: 13 Comm: ksoftirqd/1 Not tainted 3.12.0-rc3+ #45
      [   56.868721] Hardware name: System manufacturer System Product Name/P8Z77 WS, BIOS 3007 07/26/2012
      [   56.882004]  ffffffff821944c0 ffff88080bbdb8c8 ffffffff8175a145 0000000000000007
      [   56.895630]  ffff88080bbd5f40 ffff88080bbdb928 ffffffff81755b14 0000000000000001
      [   56.909313]  ffff880800000001 ffff880800000000 ffffffff8101178f 0000000000000001
      [   56.923006] Call Trace:
      [   56.929532]  [<ffffffff8175a145>] dump_stack+0x55/0x76
      [   56.936067]  [<ffffffff81755b14>] print_usage_bug+0x1f7/0x208
      [   56.942445]  [<ffffffff8101178f>] ? save_stack_trace+0x2f/0x50
      [   56.948932]  [<ffffffff810cc0a0>] ? check_usage_backwards+0x150/0x150
      [   56.955470]  [<ffffffff810ccb52>] mark_lock+0x282/0x2c0
      [   56.961945]  [<ffffffff810ccfed>] __lock_acquire+0x45d/0x1d50
      [   56.968474]  [<ffffffff810cce6e>] ? __lock_acquire+0x2de/0x1d50
      [   56.975140]  [<ffffffff81393bf5>] ? cpumask_next_and+0x55/0x90
      [   56.981942]  [<ffffffff810cef72>] lock_acquire+0x92/0x1d0
      [   56.988745]  [<ffffffff8118f52a>] ? vm_unmap_aliases+0x16a/0x380
      [   56.995619]  [<ffffffff817628f1>] _raw_spin_lock+0x41/0x50
      [   57.002493]  [<ffffffff8118f52a>] ? vm_unmap_aliases+0x16a/0x380
      [   57.009447]  [<ffffffff8118f52a>] vm_unmap_aliases+0x16a/0x380
      [   57.016477]  [<ffffffff8118f44c>] ? vm_unmap_aliases+0x8c/0x380
      [   57.023607]  [<ffffffff810436b0>] change_page_attr_set_clr+0xc0/0x460
      [   57.030818]  [<ffffffff810cfb8d>] ? trace_hardirqs_on+0xd/0x10
      [   57.037896]  [<ffffffff811a8330>] ? kmem_cache_free+0xb0/0x2b0
      [   57.044789]  [<ffffffff811b59c3>] ? free_object_rcu+0x93/0xa0
      [   57.051720]  [<ffffffff81043d9f>] set_memory_rw+0x2f/0x40
      [   57.058727]  [<ffffffff8104e17c>] bpf_jit_free+0x2c/0x40
      [   57.065577]  [<ffffffff81642cba>] sk_filter_release_rcu+0x1a/0x30
      [   57.072338]  [<ffffffff811108e2>] rcu_process_callbacks+0x202/0x7c0
      [   57.078962]  [<ffffffff81057f17>] __do_softirq+0xf7/0x3f0
      [   57.085373]  [<ffffffff81058245>] run_ksoftirqd+0x35/0x70
      
      cannot reuse jited filter memory, since it's readonly,
      so use original bpf insns memory to hold work_struct
      
      defer kfree of sk_filter until jit completed freeing
      
      tested on x86_64 and i386
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Acked-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d45ed4a4
  5. 20 May, 2013 1 commit
  6. 21 Mar, 2013 1 commit
    • Daniel Borkmann's avatar
      filter: bpf_jit_comp: refactor and unify BPF JIT image dump output · 79617801
      Daniel Borkmann authored
      
      
      If bpf_jit_enable > 1, then we dump the emitted JIT compiled image
      after creation. Currently, only SPARC and PowerPC has similar output
      as in the reference implementation on x86_64. Make a small helper
      function in order to reduce duplicated code and make the dump output
      uniform across architectures x86_64, SPARC, PPC, ARM (e.g. on ARM
      flen, pass and proglen are currently not shown, but would be
      interesting to know as well), also for future BPF JIT implementations
      on other archs.
      
      Cc: Mircea Gherzan <mgherzan@gmail.com>
      Cc: Matt Evans <matt@ozlabs.org>
      Cc: Eric Dumazet <eric.dumazet@google.com>
      Cc: David S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarDaniel Borkmann <dborkman@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      79617801
  7. 18 Nov, 2012 2 commits
  8. 10 Jul, 2012 1 commit
  9. 30 Apr, 2012 1 commit
  10. 21 Jul, 2011 1 commit
    • Matt Evans's avatar
      net: filter: BPF 'JIT' compiler for PPC64 · 0ca87f05
      Matt Evans authored
      
      
      An implementation of a code generator for BPF programs to speed up packet
      filtering on PPC64, inspired by Eric Dumazet's x86-64 version.
      
      Filter code is generated as an ABI-compliant function in module_alloc()'d mem
      with stackframe & prologue/epilogue generated if required (simple filters don't
      need anything more than an li/blr).  The filter's local variables, M[], live in
      registers.  Supports all BPF opcodes, although "complicated" loads from negative
      packet offsets (e.g. SKF_LL_OFF) are not yet supported.
      
      There are a couple of further optimisations left for future work; many-pass
      assembly with branch-reach reduction and a register allocator to push M[]
      variables into volatile registers would improve the code quality further.
      
      This currently supports big-endian 64-bit PowerPC only (but is fairly simple
      to port to PPC32 or LE!).
      
      Enabled in the same way as x86-64:
      
      	echo 1 > /proc/sys/net/core/bpf_jit_enable
      
      Or, enabled with extra debug output:
      
      	echo 2 > /proc/sys/net/core/bpf_jit_enable
      Signed-off-by: default avatarMatt Evans <matt@ozlabs.org>
      Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0ca87f05