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CVE-2023-53783

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

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
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version 7caa47151ab2e644dd221f741ec7578d9532c9a3
Version < 9e8bf9f95f7a299fa9ea45b678d001806ad5e12c
Status affected
Version 7caa47151ab2e644dd221f741ec7578d9532c9a3
Version < 6e291810fe83a384700eb24a1f714966391ed562
Status affected
Version 7caa47151ab2e644dd221f741ec7578d9532c9a3
Version < 3538ade9d8c2ba41088e395de916f2599fadba8f
Status affected
Version 7caa47151ab2e644dd221f741ec7578d9532c9a3
Version < bf8eb1fd6110871e6232e8e7efe399276ef7e6f6
Status affected
Version 7caa47151ab2e644dd221f741ec7578d9532c9a3
Version < b96d7b4a9745fbd0c8384608ceb1f50415e862fa
Status affected
Version 7caa47151ab2e644dd221f741ec7578d9532c9a3
Version < 984af1e66b4126cf145153661cc24c213e2ec231
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 5.4
Status affected
Version 0
Version < 5.4
Status unaffected
Version <= 5.4.*
Version 5.4.235
Status unaffected
Version <= 5.10.*
Version 5.10.173
Status unaffected
Version <= 5.15.*
Version 5.15.99
Status unaffected
Version <= 6.1.*
Version 6.1.16
Status unaffected
Version <= 6.2.*
Version 6.2.3
Status unaffected
Version <= *
Version 6.3
Status unaffected
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.03% 0.085
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Es wurden noch keine Informationen zu CWE veröffentlicht.