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[Bug 2087853] Re: UFS: uspi->s_3apb UBSAN: shift-out-of-bounds

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All kernels seem to be affected. However the priority is low and impact
is none, upstream refused to take this as a stable patch:
https://lore.kernel.org/linux-
kernel/20241112120304.32452-1-agathe.porte@xxxxxxxxxxxxx/T/#t

The impact is basically none except for the releases that have UBSAN
enabled, in which case it might show this warning.

Patch v3 without stable Cc: https://lore.kernel.org/linux-
kernel/20241112122000.35610-1-agathe.porte@xxxxxxxxxxxxx/T/#t

** Changed in: linux (Ubuntu Oracular)
       Status: New => Triaged

** Changed in: linux (Ubuntu Oracular)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Oracular)
     Assignee: (unassigned) => Agathe Porte (gagath)

** Changed in: linux (Ubuntu Noble)
       Status: New => Triaged

** Changed in: linux (Ubuntu Noble)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Noble)
     Assignee: (unassigned) => Agathe Porte (gagath)

** Changed in: linux (Ubuntu Jammy)
       Status: New => Triaged

** Changed in: linux (Ubuntu Jammy)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Jammy)
     Assignee: (unassigned) => Agathe Porte (gagath)

** Changed in: linux (Ubuntu Focal)
       Status: New => Won't Fix

** Changed in: linux (Ubuntu Bionic)
       Status: New => Won't Fix

** Changed in: linux (Ubuntu Xenial)
       Status: New => Won't Fix

** Changed in: linux (Ubuntu Trusty)
       Status: New => Won't Fix

** Changed in: linux (Ubuntu Focal)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Bionic)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Trusty)
   Importance: Undecided => Low

** No longer affects: linux (Ubuntu Trusty)

** No longer affects: linux (Ubuntu Xenial)

** No longer affects: linux (Ubuntu Bionic)

** No longer affects: linux (Ubuntu Focal)

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https://bugs.launchpad.net/bugs/2087853

Title:
  UFS: uspi->s_3apb UBSAN: shift-out-of-bounds

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Jammy:
  Triaged
Status in linux source package in Noble:
  Triaged
Status in linux source package in Oracular:
  Triaged

Bug description:
  Hello!

  I have mounted UFS partition (ufstype=ufs2).
  Ubuntu allows only read only mounts for UFS by default, so it is mounted with ro option.

  I see those messages in the log:

  kernel: ------------[ cut here ]------------
  kernel: UBSAN: shift-out-of-bounds in /build/linux-21sZ5Q/linux-6.8.0/fs/ufs/super.c:1247:19
  kernel: shift exponent 36 is too large for 32-bit type 'int'
  kernel: CPU: 3 PID: 2212 Comm: mount Not tainted 6.8.0-48-generic #48-Ubuntu
  kernel: Hardware name: SOYO SY-YL B550M/SY-YL B550M, BIOS 5.17 05/19/2023
  kernel: Call Trace:
  kernel:  <TASK>
  kernel:  dump_stack_lvl+0x76/0xa0
  kernel:  dump_stack+0x10/0x20
  kernel:  __ubsan_handle_shift_out_of_bounds+0x199/0x370
  kernel:  ufs_fill_super.cold+0x16/0x1b7 [ufs]
  kernel:  ? sb_set_blocksize+0x1d/0x70
  kernel:  ? __pfx_ufs_fill_super+0x10/0x10 [ufs]
  kernel:  mount_bdev+0xf6/0x140
  kernel:  ufs_mount+0x15/0x30 [ufs]
  kernel:  legacy_get_tree+0x2b/0x60
  kernel:  vfs_get_tree+0x2a/0x100
  kernel:  do_new_mount+0x1a0/0x340
  kernel:  path_mount+0x1e0/0x830
  kernel:  ? putname+0x5b/0x80
  kernel:  __x64_sys_mount+0x127/0x160
  kernel:  x64_sys_call+0x1df5/0x25c0
  kernel:  do_syscall_64+0x7f/0x180
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? mntput+0x24/0x50
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? path_put+0x1e/0x30
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? do_faccessat+0x1c2/0x2f0
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? syscall_exit_to_user_mode+0x86/0x260
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? do_syscall_64+0x8c/0x180
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? syscall_exit_to_user_mode+0x86/0x260
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? do_syscall_64+0x8c/0x180
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? __do_sys_newfstatat+0x53/0x90
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? syscall_exit_to_user_mode+0x86/0x260
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? do_syscall_64+0x8c/0x180
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? irqentry_exit+0x43/0x50
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? exc_page_fault+0x94/0x1b0
  kernel:  entry_SYSCALL_64_after_hwframe+0x78/0x80
  kernel: RIP: 0033:0x7417b2d2af0e
  kernel: Code: 48 8b 0d 0d 7f 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d da 7e 0d 00 f7 d8 64 89 01 48
  kernel: RSP: 002b:00007fff1145f4d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
  kernel: RAX: ffffffffffffffda RBX: 000059b6f92e7b00 RCX: 00007417b2d2af0e
  kernel: RDX: 000059b6f92e7f10 RSI: 000059b6f92e81b0 RDI: 000059b6f92e83f0
  kernel: RBP: 00007fff1145f540 R08: 000059b6f92e8150 R09: 00007fff1145f5b0
  kernel: R10: 0000000000000401 R11: 0000000000000246 R12: 000059b6f92e83f0
  kernel: R13: 000059b6f92e81b0 R14: 000059b6f92e7f10 R15: 000059b6f92e7c60
  kernel:  </TASK>
  kernel: ---[ end trace ]---

  kernel: ------------[ cut here ]------------
  kernel: UBSAN: shift-out-of-bounds in /build/linux-21sZ5Q/linux-6.8.0/fs/ufs/super.c:1247:19
  kernel: shift exponent 36 is too large for 32-bit type 'int'
  kernel: CPU: 6 PID: 2113 Comm: mount Not tainted 6.8.0-48-generic #48-Ubuntu
  kernel: Hardware name: SOYO SY-YL B550M/SY-YL B550M, BIOS 5.17 05/19/2023
  kernel: Call Trace:
  kernel:  <TASK>
  kernel:  dump_stack_lvl+0x76/0xa0
  kernel:  dump_stack+0x10/0x20
  kernel:  __ubsan_handle_shift_out_of_bounds+0x199/0x370
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ufs_fill_super.cold+0x16/0x1b7 [ufs]
  kernel:  ? sb_set_blocksize+0x1d/0x70
  kernel:  ? __pfx_ufs_fill_super+0x10/0x10 [ufs]
  kernel:  mount_bdev+0xf6/0x140
  kernel:  ufs_mount+0x15/0x30 [ufs]
  kernel:  legacy_get_tree+0x2b/0x60
  kernel:  vfs_get_tree+0x2a/0x100
  kernel:  do_new_mount+0x1a0/0x340
  kernel:  path_mount+0x1e0/0x830
  kernel:  ? putname+0x5b/0x80
  kernel:  __x64_sys_mount+0x127/0x160
  kernel:  x64_sys_call+0x1df5/0x25c0
  kernel:  do_syscall_64+0x7f/0x180
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? syscall_exit_to_user_mode+0x86/0x260
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? do_syscall_64+0x8c/0x180
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? do_syscall_64+0x8c/0x180
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? do_syscall_64+0x8c/0x180
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? irqentry_exit+0x43/0x50
  kernel:  ? srso_return_thunk+0x5/0x5f
  kernel:  ? exc_page_fault+0x94/0x1b0
  kernel:  entry_SYSCALL_64_after_hwframe+0x78/0x80
  kernel: RIP: 0033:0x7b616d52af0e
  kernel: Code: 48 8b 0d 0d 7f 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d da 7e 0d 00 f7 d8 64 89 01 48
  kernel: RSP: 002b:00007ffc10c387b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
  kernel: RAX: ffffffffffffffda RBX: 00005d6eb3bc9b00 RCX: 00007b616d52af0e
  kernel: RDX: 00005d6eb3bc9f10 RSI: 00005d6eb3bca1b0 RDI: 00005d6eb3bca3f0
  kernel: RBP: 00007ffc10c38820 R08: 00005d6eb3bca150 R09: 00007ffc10c38890
  kernel: R10: 0000000000000401 R11: 0000000000000246 R12: 00005d6eb3bca3f0
  kernel: R13: 00005d6eb3bca1b0 R14: 00005d6eb3bc9f10 R15: 00005d6eb3bc9c60
  kernel:  </TASK>
  kernel: ---[ end trace ]---

  cat /proc/version_signature
  Ubuntu 6.8.0-48.48-generic 6.8.12

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