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CVE PROGRAM SOURCE RECORDUnscored

CVE-2023-53783

blk-iocost: fix divide by 0 error in calc_lcoefs()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: blk-iocost: fix divide by 0 error in calc_lcoefs() echo max of u64 to cost.model can cause divide by 0 error. # echo 8:0 rbps=18446744073709551615 > /sys/fs/cgroup/io.cost.model divide error: 0000 [#1] PREEMPT SMP RIP: 0010:calc_lcoefs+0x4c/0xc0 Call Trace: <TASK> ioc_refresh_params+0x2b3/0x4f0 ioc_cost_model_write+0x3cb/0x4c0 ? _copy_from_iter+0x6d/0x6c0 ? kernfs_fop_write_iter+0xfc/0x270 cgroup_file_write+0xa0/0x200 kernfs_fop_write_iter+0x17d/0x270 vfs_write+0x414/0x620 ksys_write+0x73/0x160 __x64_sys_write+0x1e/0x30 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd calc_lcoefs() uses the input value of cost.model in DIV_ROUND_UP_ULL, overflow would happen if bps plus IOC_PAGE_SIZE is greater than ULLONG_MAX, it can cause divide by 0 error. Fix the problem by setting basecost

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 7caa47151ab2e644dd221f741ec7578d9532c9a3 to < 9e8bf9f95f7a299fa9ea45b678d001806ad5e12caffected
  • 7caa47151ab2e644dd221f741ec7578d9532c9a3 to < 6e291810fe83a384700eb24a1f714966391ed562affected
  • 7caa47151ab2e644dd221f741ec7578d9532c9a3 to < 3538ade9d8c2ba41088e395de916f2599fadba8faffected
  • 7caa47151ab2e644dd221f741ec7578d9532c9a3 to < bf8eb1fd6110871e6232e8e7efe399276ef7e6f6affected
  • 7caa47151ab2e644dd221f741ec7578d9532c9a3 to < b96d7b4a9745fbd0c8384608ceb1f50415e862faaffected
  • 7caa47151ab2e644dd221f741ec7578d9532c9a3 to < 984af1e66b4126cf145153661cc24c213e2ec231affected

Linux Linux

Default version status: affected

  • 5.4affected
  • 0 to < 5.4unaffected
  • 5.4.235 to ≤ 5.4.*unaffected
  • 5.10.173 to ≤ 5.10.*unaffected
  • 5.15.99 to ≤ 5.15.*unaffected
  • 6.1.16 to ≤ 6.1.*unaffected
  • 6.2.3 to ≤ 6.2.*unaffected
  • 6.3 to ≤ *unaffected

References