Re: [Regression] "SUNRPC: Add "@len" parameter to gss_unwrap()" breaks NFS Kerberos on upstream stable 5.4.y

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Hi,

Am 2020-07-15 20:54, schrieb Chuck Lever:
> v5.4.40 does not have 31c9590ae468 and friends, but the claim is this
> one crashes?

To my knowledge 31c9590ae468 and friends are in v5.4.40.

> And v5.4.51 has those three and 89a3c9f5b9f0, which Pierre claims fixes
> the problem for him; but another commenter says v5.4.51 still crashes.

v5.4.51 still crashes for me (and afaik it does not have 89a3c9f5b9f0). 
I applied 89a3c9f5b9f0 to the original v5.4.40 which helps mostly.

My krb5 etype is aes256-cts-hmac-sha1-96.

Below is the bug in the original v5.4.40 with KASAN enabled. It happened 
immediately after mount of /home, no login neccessary:

[   21.501730] ==================================================================
[   21.501756] BUG: KASAN: slab-out-of-bounds in _copy_from_pages+0xe9/0x200 [sunrpc]
[   21.501759] Write of size 64 at addr ffff8883bc9f3244 by task update-desktop-/1478

[   21.501763] CPU: 0 PID: 1478 Comm: update-desktop- Tainted: G           OE     5.4.0-40-generic #44
[   21.501764] Hardware name: XXXXXXXXXXXXXXXXXXXXXX
[   21.501765] Call Trace:
[   21.501769]  dump_stack+0x96/0xca
[   21.501772]  print_address_description.constprop.0+0x20/0x210
[   21.501789]  ? _copy_from_pages+0xe9/0x200 [sunrpc]
[   21.501790]  __kasan_report.cold+0x1b/0x41
[   21.501806]  ? _copy_from_pages+0xe9/0x200 [sunrpc]
[   21.501807]  kasan_report+0x12/0x20
[   21.501809]  check_memory_region+0x129/0x1b0
[   21.501811]  memcpy+0x38/0x50
[   21.501825]  _copy_from_pages+0xe9/0x200 [sunrpc]
[   21.501839]  ? call_decode+0x2fd/0x7e0 [sunrpc]
[   21.501854]  ? __rpc_execute+0x204/0xbd0 [sunrpc]
[   21.501869]  xdr_shrink_pagelen+0x198/0x3c0 [sunrpc]
[   21.501871]  ? trailing_symlink+0x6fe/0x810
[   21.501886]  xdr_align_pages+0x15f/0x580 [sunrpc]
[   21.501904]  ? decode_setattr+0x120/0x120 [nfsv4]
[   21.501920]  xdr_read_pages+0x44/0x290 [sunrpc]
[   21.501935]  ? __decode_op_hdr+0x29/0x430 [nfsv4]
[   21.501949]  nfs4_xdr_dec_readlink+0x238/0x390 [nfsv4]
[   21.501963]  ? nfs4_xdr_dec_read+0x3c0/0x3c0 [nfsv4]
[   21.501966]  ? __kasan_slab_free+0x14e/0x180
[   21.501970]  ? gss_validate+0x37e/0x610 [auth_rpcgss]
[   21.501972]  ? kasan_slab_free+0xe/0x10
[   21.501985]  ? nfs4_xdr_dec_read+0x3c0/0x3c0 [nfsv4]
[   21.502001]  rpcauth_unwrap_resp_decode+0xaa/0x100 [sunrpc]
[   21.502005]  gss_unwrap_resp+0x99d/0x1570 [auth_rpcgss]
[   21.502009]  ? gss_destroy_cred+0x460/0x460 [auth_rpcgss]
[   21.502011]  ? finish_task_switch+0x163/0x670
[   21.502014]  ? __switch_to_asm+0x34/0x70
[   21.502017]  ? gss_wrap_req+0x830/0x830 [auth_rpcgss]
[   21.502020]  ? prepare_to_wait+0xea/0x2b0
[   21.502036]  rpcauth_unwrap_resp+0xac/0x100 [sunrpc]
[   21.502049]  call_decode+0x454/0x7e0 [sunrpc]
[   21.502063]  ? rpc_decode_header+0x10a0/0x10a0 [sunrpc]
[   21.502065]  ? var_wake_function+0x140/0x140
[   21.502078]  ? call_transmit_status+0x31e/0x5d0 [sunrpc]
[   21.502091]  ? rpc_decode_header+0x10a0/0x10a0 [sunrpc]
[   21.502106]  __rpc_execute+0x204/0xbd0 [sunrpc]
[   21.502119]  ? xprt_wait_for_reply_request_def+0x170/0x170 [sunrpc]
[   21.502134]  ? rpc_exit+0xc0/0xc0 [sunrpc]
[   21.502135]  ? __kasan_check_read+0x11/0x20
[   21.502137]  ? wake_up_bit+0x42/0x50
[   21.502151]  rpc_execute+0x1a0/0x1f0 [sunrpc]
[   21.502165]  rpc_run_task+0x454/0x5e0 [sunrpc]
[   21.502179]  nfs4_call_sync_custom+0x12/0x70 [nfsv4]
[   21.502192]  nfs4_call_sync_sequence+0x143/0x1f0 [nfsv4]
[   21.502194]  ? __read_once_size_nocheck.constprop.0+0x10/0x10
[   21.502207]  ? nfs4_call_sync_custom+0x70/0x70 [nfsv4]
[   21.502209]  ? __kasan_check_read+0x11/0x20
[   21.502211]  ? rmqueue+0x397/0x2410
[   21.502225]  _nfs4_proc_readlink+0x1a6/0x250 [nfsv4]
[   21.502238]  ? _nfs4_proc_getdeviceinfo+0x350/0x350 [nfsv4]
[   21.502254]  nfs4_proc_readlink+0x101/0x2c0 [nfsv4]
[   21.502268]  ? nfs4_proc_link+0x1c0/0x1c0 [nfsv4]
[   21.502271]  ? add_to_page_cache_locked+0x20/0x20
[   21.502285]  nfs_symlink_filler+0xdc/0x190 [nfs]
[   21.502287]  do_read_cache_page+0x60e/0x1490
[   21.502297]  ? nfs4_do_lookup_revalidate+0x1a1/0x2d0 [nfs]
[   21.502308]  ? nfs_get_link+0x370/0x370 [nfs]
[   21.502311]  ? xas_load+0x23/0x250
[   21.502312]  ? pagecache_get_page+0x760/0x760
[   21.502315]  ? lockref_get_not_dead+0xe3/0x1c0
[   21.502317]  ? __kasan_check_write+0x14/0x20
[   21.502318]  ? lockref_get_not_dead+0xe3/0x1c0
[   21.502320]  ? __kasan_check_write+0x14/0x20
[   21.502321]  ? _raw_spin_lock+0x7b/0xd0
[   21.502323]  ? _raw_write_trylock+0x110/0x110
[   21.502325]  read_cache_page+0x4c/0x80
[   21.502335]  nfs_get_link+0x75/0x370 [nfs]
[   21.502337]  trailing_symlink+0x6fe/0x810
[   21.502347]  ? nfs_destroy_readpagecache+0x20/0x20 [nfs]
[   21.502349]  path_lookupat.isra.0+0x188/0x7d0
[   21.502351]  ? do_syscall_64+0x9f/0x3a0
[   21.502353]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   21.502355]  ? path_parentat.isra.0+0x110/0x110
[   21.502357]  ? stack_trace_save+0x94/0xc0
[   21.502359]  ? stack_trace_consume_entry+0x170/0x170
[   21.502361]  filename_lookup+0x185/0x3b0
[   21.502362]  ? nd_jump_link+0x1d0/0x1d0
[   21.502364]  ? kasan_slab_free+0xe/0x10
[   21.502366]  ? __kasan_check_read+0x11/0x20
[   21.502367]  ? __check_object_size+0x249/0x316
[   21.502369]  ? strncpy_from_user+0x80/0x290
[   21.502370]  ? kmem_cache_alloc+0x180/0x250
[   21.502372]  ? getname_flags+0x100/0x520
[   21.502374]  user_path_at_empty+0x3a/0x50
[   21.502375]  vfs_statx+0xca/0x150
[   21.502377]  ? vfs_statx_fd+0x90/0x90
[   21.502379]  ? __kasan_slab_free+0x14e/0x180
[   21.502381]  __do_sys_newstat+0x9a/0x100
[   21.502382]  ? cp_new_stat+0x5d0/0x5d0
[   21.502384]  ? __kasan_check_write+0x14/0x20
[   21.502385]  ? _raw_spin_lock_irq+0x82/0xe0
[   21.502386]  ? _raw_read_lock_irq+0x50/0x50
[   21.502388]  ? __blkcg_punt_bio_submit+0x1c0/0x1c0
[   21.502390]  ? __kasan_check_write+0x14/0x20
[   21.502392]  ? switch_fpu_return+0x13a/0x2d0
[   21.502393]  ? fpregs_mark_activate+0x150/0x150
[   21.502395]  __x64_sys_newstat+0x54/0x80
[   21.502397]  do_syscall_64+0x9f/0x3a0
[   21.502398]  ? prepare_exit_to_usermode+0xee/0x1a0
[   21.502400]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   21.502402] RIP: 0033:0x7f9afc30049a
[   21.502404] Code: 00 00 75 05 48 83 c4 18 c3 e8 f2 24 02 00 66 90 f3 0f 1e fa 41 89 f8 48 89 f7 48 89 d6 41 83 f8 01 77 2d b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 8b 15 c1 a9 0d 00 f7
[   21.502405] RSP: 002b:00007ffe7cd464c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004
[   21.502407] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f9afc30049a
[   21.502408] RDX: 00007ffe7cd464d0 RSI: 00007ffe7cd464d0 RDI: 000055c9330705f0
[   21.502409] RBP: 000055c9330705f0 R08: 0000000000000001 R09: 0000000000000001
[   21.502410] R10: 0000000000000017 R11: 0000000000000246 R12: 000055c933074de3
[   21.502410] R13: 000055c93306e1a0 R14: 000055c93306c940 R15: 000055c93306c990

[   21.502414] Allocated by task 1478:
[   21.502416]  save_stack+0x23/0x90
[   21.502418]  __kasan_kmalloc.constprop.0+0xcf/0xe0
[   21.502419]  kasan_slab_alloc+0xe/0x10
[   21.502420]  kmem_cache_alloc+0xd7/0x250
[   21.502422]  mempool_alloc_slab+0x17/0x20
[   21.502424]  mempool_alloc+0x126/0x330
[   21.502439]  rpc_malloc+0x1f2/0x270 [sunrpc]
[   21.502452]  call_allocate+0x3b9/0x9d0 [sunrpc]
[   21.502467]  __rpc_execute+0x204/0xbd0 [sunrpc]
[   21.502480]  rpc_execute+0x1a0/0x1f0 [sunrpc]
[   21.502493]  rpc_run_task+0x454/0x5e0 [sunrpc]
[   21.502507]  nfs4_call_sync_custom+0x12/0x70 [nfsv4]
[   21.502520]  nfs4_call_sync_sequence+0x143/0x1f0 [nfsv4]
[   21.502533]  _nfs4_proc_readlink+0x1a6/0x250 [nfsv4]
[   21.502546]  nfs4_proc_readlink+0x101/0x2c0 [nfsv4]
[   21.502558]  nfs_symlink_filler+0xdc/0x190 [nfs]
[   21.502560]  do_read_cache_page+0x60e/0x1490
[   21.502561]  read_cache_page+0x4c/0x80
[   21.502571]  nfs_get_link+0x75/0x370 [nfs]
[   21.502572]  trailing_symlink+0x6fe/0x810
[   21.502574]  path_lookupat.isra.0+0x188/0x7d0
[   21.502575]  filename_lookup+0x185/0x3b0
[   21.502576]  user_path_at_empty+0x3a/0x50
[   21.502578]  vfs_statx+0xca/0x150
[   21.502579]  __do_sys_newstat+0x9a/0x100
[   21.502581]  __x64_sys_newstat+0x54/0x80
[   21.502582]  do_syscall_64+0x9f/0x3a0
[   21.502584]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

[   21.502585] Freed by task 0:
[   21.502586] (stack is not available)

[   21.502589] The buggy address belongs to the object at ffff8883bc9f2a80
                which belongs to the cache rpc_buffers of size 2048
[   21.502591] The buggy address is located 1988 bytes inside of
                2048-byte region [ffff8883bc9f2a80, ffff8883bc9f3280)
[   21.502592] The buggy address belongs to the page:
[   21.502595] page:ffffea000ef27c00 refcount:1 mapcount:0 mapping:ffff8883bf61e600 index:0x0 compound_mapcount: 0
[   21.502597] flags: 0x17ffffc0010200(slab|head)
[   21.502600] raw: 0017ffffc0010200 dead000000000100 dead000000000122 ffff8883bf61e600
[   21.502602] raw: 0000000000000000 00000000800f000f 00000001ffffffff 0000000000000000
[   21.502603] page dumped because: kasan: bad access detected

[   21.502605] Memory state around the buggy address:
[   21.502607]  ffff8883bc9f3180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   21.502608]  ffff8883bc9f3200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   21.502610] >ffff8883bc9f3280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   21.502611]                    ^
[   21.502612]  ffff8883bc9f3300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   21.502614]  ffff8883bc9f3380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   21.502615] ==================================================================
[   21.502616] Disabling lock debugging due to kernel taint

Best Regards
-- 
Pierre Sauter
Studentenwerk München
-------






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