Bug 2309844 (CVE-2024-44981)

Summary: CVE-2024-44981 kernel: workqueue: Fix UBSAN 'subtraction overflow' error in shift_and_mask()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2309933    
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Description OSIDB Bzimport 2024-09-04 20:21:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

workqueue: Fix UBSAN 'subtraction overflow' error in shift_and_mask()

UBSAN reports the following 'subtraction overflow' error when booting
in a virtual machine on Android:

 | Internal error: UBSAN: integer subtraction overflow: 00000000f2005515 [#1] PREEMPT SMP
 | Modules linked in:
 | CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.10.0-00006-g3cbe9e5abd46-dirty #4
 | Hardware name: linux,dummy-virt (DT)
 | pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 | pc : cancel_delayed_work+0x34/0x44
 | lr : cancel_delayed_work+0x2c/0x44
 | sp : ffff80008002ba60
 | x29: ffff80008002ba60 x28: 0000000000000000 x27: 0000000000000000
 | x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
 | x23: 0000000000000000 x22: 0000000000000000 x21: ffff1f65014cd3c0
 | x20: ffffc0e84c9d0da0 x19: ffffc0e84cab3558 x18: ffff800080009058
 | x17: 00000000247ee1f8 x16: 00000000247ee1f8 x15: 00000000bdcb279d
 | x14: 0000000000000001 x13: 0000000000000075 x12: 00000a0000000000
 | x11: ffff1f6501499018 x10: 00984901651fffff x9 : ffff5e7cc35af000
 | x8 : 0000000000000001 x7 : 3d4d455453595342 x6 : 000000004e514553
 | x5 : ffff1f6501499265 x4 : ffff1f650ff60b10 x3 : 0000000000000620
 | x2 : ffff80008002ba78 x1 : 0000000000000000 x0 : 0000000000000000
 | Call trace:
 |  cancel_delayed_work+0x34/0x44
 |  deferred_probe_extend_timeout+0x20/0x70
 |  driver_register+0xa8/0x110
 |  __platform_driver_register+0x28/0x3c
 |  syscon_init+0x24/0x38
 |  do_one_initcall+0xe4/0x338
 |  do_initcall_level+0xac/0x178
 |  do_initcalls+0x5c/0xa0
 |  do_basic_setup+0x20/0x30
 |  kernel_init_freeable+0x8c/0xf8
 |  kernel_init+0x28/0x1b4
 |  ret_from_fork+0x10/0x20
 | Code: f9000fbf 97fffa2f 39400268 37100048 (d42aa2a0)
 | ---[ end trace 0000000000000000 ]---
 | Kernel panic - not syncing: UBSAN: integer subtraction overflow: Fatal exception

This is due to shift_and_mask() using a signed immediate to construct
the mask and being called with a shift of 31 (WORK_OFFQ_POOL_SHIFT) so
that it ends up decrementing from INT_MIN.

Use an unsigned constant '1U' to generate the mask in shift_and_mask().
Comment 1 Robb Gatica 2024-09-04 22:08:48 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024090444-CVE-2024-44981-2604@gregkh/T