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081-08-pppoe-fix-memory-corruption-in-padt-work-structure.patch

081-08-pppoe-fix-memory-corruption-in-padt-work-structure.patch 3.6 KB
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  1. From: Guillaume Nault <g.nault@alphalink.fr>
    2. 

  2. Date: Thu, 3 Dec 2015 16:49:32 +0100
    3. 

  3. Subject: [PATCH] pppoe: fix memory corruption in padt work structure
    4. 

  4. 

  5. pppoe_connect() mustn't touch the padt_work field of pppoe sockets
    6. 

  6. because that work could be already pending.
    7. 

  7. 

  8. [   21.473147] BUG: unable to handle kernel NULL pointer dereference at 00000004
    9. 

  9. [   21.474523] IP: [<c1043177>] process_one_work+0x29/0x31c
    10. 

  10. [   21.475164] *pde = 00000000
    11. 

  11. [   21.475513] Oops: 0000 [#1] SMP
    12. 

  12. [   21.475910] Modules linked in: pppoe pppox ppp_generic slhc crc32c_intel aesni_intel virtio_net xts aes_i586 lrw gf128mul ablk_helper cryptd evdev acpi_cpufreq processor serio_raw button ext4 crc16 mbcache jbd2 virtio_blk virtio_pci virtio_ring virtio
    13. 

  13. [   21.476168] CPU: 2 PID: 164 Comm: kworker/2:2 Not tainted 4.4.0-rc1 #1
    14. 

  14. [   21.476168] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
    15. 

  15. [   21.476168] task: f5f83c00 ti: f5e28000 task.ti: f5e28000
    16. 

  16. [   21.476168] EIP: 0060:[<c1043177>] EFLAGS: 00010046 CPU: 2
    17. 

  17. [   21.476168] EIP is at process_one_work+0x29/0x31c
    18. 

  18. [   21.484082] EAX: 00000000 EBX: f678b2a0 ECX: 00000004 EDX: 00000000
    19. 

  19. [   21.484082] ESI: f6c69940 EDI: f5e29ef0 EBP: f5e29f0c ESP: f5e29edc
    20. 

  20. [   21.484082]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
    21. 

  21. [   21.484082] CR0: 80050033 CR2: 000000a4 CR3: 317ad000 CR4: 00040690
    22. 

  22. [   21.484082] Stack:
    23. 

  23. [   21.484082]  00000000 f6c69950 00000000 f6c69940 c0042338 f5e29f0c c1327945 00000000
    24. 

  24. [   21.484082]  00000008 f678b2a0 f6c69940 f678b2b8 f5e29f30 c1043984 f5f83c00 f6c69970
    25. 

  25. [   21.484082]  f678b2a0 c10437d3 f6775e80 f678b2a0 c10437d3 f5e29fac c1047059 f5e29f74
    26. 

  26. [   21.484082] Call Trace:
    27. 

  27. [   21.484082]  [<c1327945>] ? _raw_spin_lock_irq+0x28/0x30
    28. 

  28. [   21.484082]  [<c1043984>] worker_thread+0x1b1/0x244
    29. 

  29. [   21.484082]  [<c10437d3>] ? rescuer_thread+0x229/0x229
    30. 

  30. [   21.484082]  [<c10437d3>] ? rescuer_thread+0x229/0x229
    31. 

  31. [   21.484082]  [<c1047059>] kthread+0x8f/0x94
    32. 

  32. [   21.484082]  [<c1327a32>] ? _raw_spin_unlock_irq+0x22/0x26
    33. 

  33. [   21.484082]  [<c1327ee9>] ret_from_kernel_thread+0x21/0x38
    34. 

  34. [   21.484082]  [<c1046fca>] ? kthread_parkme+0x19/0x19
    35. 

  35. [   21.496082] Code: 5d c3 55 89 e5 57 56 53 89 c3 83 ec 24 89 d0 89 55 e0 8d 7d e4 e8 6c d8 ff ff b9 04 00 00 00 89 45 d8 8b 43 24 89 45 dc 8b 45 d8 <8b> 40 04 8b 80 e0 00 00 00 c1 e8 05 24 01 88 45 d7 8b 45 e0 8d
    36. 

  36. [   21.496082] EIP: [<c1043177>] process_one_work+0x29/0x31c SS:ESP 0068:f5e29edc
    37. 

  37. [   21.496082] CR2: 0000000000000004
    38. 

  38. [   21.496082] ---[ end trace e362cc9cf10dae89 ]---
    39. 

  39. 

  40. Reported-by: Andrew <nitr0@seti.kr.ua>
    41. 

  41. Fixes: 287f3a943fef ("pppoe: Use workqueue to die properly when a PADT is received")
    42. 

  42. Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
    43. 

  43. Signed-off-by: David S. Miller <davem@davemloft.net>
    44. 

  44. ---
    45. 

  45. 

  46. --- a/drivers/net/ppp/pppoe.c
    47. 

  47. +++ b/drivers/net/ppp/pppoe.c
    48. 

  48. @@ -550,6 +550,9 @@ static int pppoe_create(struct net *net,
    49. 

  49.  	sk->sk_family		= PF_PPPOX;
    50. 

  50.  	sk->sk_protocol		= PX_PROTO_OE;
    51. 

  51.  
    52. 

  52. +	INIT_WORK(&pppox_sk(sk)->proto.pppoe.padt_work,
    53. 

  53. +		  pppoe_unbind_sock_work);
    54. 

  54. +
    55. 

  55.  	return 0;
    56. 

  56.  }
    57. 

  57.  
    58. 

  58. @@ -614,8 +617,6 @@ static int pppoe_connect(struct socket *
    59. 

  59.  
    60. 

  60.  	lock_sock(sk);
    61. 

  61.  
    62. 

  62. -	INIT_WORK(&po->proto.pppoe.padt_work, pppoe_unbind_sock_work);
    63. 

  63. -
    64. 

  64.  	error = -EINVAL;
    65. 

  65.  	if (sp->sa_protocol != PX_PROTO_OE)
    66. 

  66.  		goto end;
    67. 

  67. @@ -645,8 +646,13 @@ static int pppoe_connect(struct socket *
    68. 

  68.  			po->pppoe_dev = NULL;
    69. 

  69.  		}
    70. 

  70.  
    71. 

  71. -		memset(sk_pppox(po) + 1, 0,
    72. 

  72. -		       sizeof(struct pppox_sock) - sizeof(struct sock));
    73. 

  73. +		po->pppoe_ifindex = 0;
    74. 

  74. +		memset(&po->pppoe_pa, 0, sizeof(po->pppoe_pa));
    75. 

  75. +		memset(&po->pppoe_relay, 0, sizeof(po->pppoe_relay));
    76. 

  76. +		memset(&po->chan, 0, sizeof(po->chan));
    77. 

  77. +		po->next = NULL;
    78. 

  78. +		po->num = 0;
    79. 

  79. +
    80. 

  80.  		sk->sk_state = PPPOX_NONE;
    81. 

  81.  	}
    82. 

  82.  
    83.