cve-2024-42102
Vulnerability from cvelistv5
Published
2024-07-30 07:45
Modified
2024-12-19 09:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" Patch series "mm: Avoid possible overflows in dirty throttling". Dirty throttling logic assumes dirty limits in page units fit into 32-bits. This patch series makes sure this is true (see patch 2/2 for more details). This patch (of 2): This reverts commit 9319b647902cbd5cc884ac08a8a6d54ce111fc78. The commit is broken in several ways. Firstly, the removed (u64) cast from the multiplication will introduce a multiplication overflow on 32-bit archs if wb_thresh * bg_thresh >= 1<<32 (which is actually common - the default settings with 4GB of RAM will trigger this). Secondly, the div64_u64() is unnecessarily expensive on 32-bit archs. We have div64_ul() in case we want to be safe & cheap. Thirdly, if dirty thresholds are larger than 1<<32 pages, then dirty balancing is going to blow up in many other spectacular ways anyway so trying to fix one possible overflow is just moot.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/000099d71648504fb9c7a4616f92c2b70c3e44ecPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/145faa3d03688cbb7bbaaecbd84c01539852942cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/253f9ea7e8e53a5176bd80ceb174907b10724c1aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2820005edae13b140f2d54267d1bd6bb23915f59Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/30139c702048f1097342a31302cbd3d478f50c63Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cbbe17a324437c0ff99881a3ee453da45b228a00Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f6620df12cb6bdcad671d269debbb23573502f9dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/000099d71648504fb9c7a4616f92c2b70c3e44ecPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/145faa3d03688cbb7bbaaecbd84c01539852942cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/253f9ea7e8e53a5176bd80ceb174907b10724c1aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2820005edae13b140f2d54267d1bd6bb23915f59Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/30139c702048f1097342a31302cbd3d478f50c63Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cbbe17a324437c0ff99881a3ee453da45b228a00Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f6620df12cb6bdcad671d269debbb23573502f9dPatch
Impacted products
Vendor Product Version
Linux Linux Version: 6.8
Show details on NVD website

To clipboard 

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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.