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Message-ID: <2024073019-CVE-2024-42102-bcee@gregkh> Date: Tue, 30 Jul 2024 09:47:20 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-42102: Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" Description =========== 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. The Linux kernel CVE team has assigned CVE-2024-42102 to this issue. Affected and fixed versions =========================== Issue introduced in 4.19.307 with commit c593d26fb5d5 and fixed in 4.19.318 with commit 253f9ea7e8e5 Issue introduced in 5.4.269 with commit 1f12e4b3284d and fixed in 5.4.280 with commit 23a28f5f3f6c Issue introduced in 5.10.210 with commit 81e7d2530d45 and fixed in 5.10.222 with commit 145faa3d0368 Issue introduced in 5.15.149 with commit 5099871b3703 and fixed in 5.15.163 with commit 2820005edae1 Issue introduced in 6.1.79 with commit 16b1025eaa8f and fixed in 6.1.98 with commit cbbe17a32443 Issue introduced in 6.6.18 with commit ec18ec230301 and fixed in 6.6.39 with commit f6620df12cb6 Issue introduced in 6.8 with commit 9319b647902c and fixed in 6.9.9 with commit 000099d71648 Issue introduced in 6.8 with commit 9319b647902c and fixed in 6.10 with commit 30139c702048 Issue introduced in 6.7.6 with commit 65977bed167a Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-42102 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: mm/page-writeback.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/253f9ea7e8e53a5176bd80ceb174907b10724c1a https://git.kernel.org/stable/c/23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807 https://git.kernel.org/stable/c/145faa3d03688cbb7bbaaecbd84c01539852942c https://git.kernel.org/stable/c/2820005edae13b140f2d54267d1bd6bb23915f59 https://git.kernel.org/stable/c/cbbe17a324437c0ff99881a3ee453da45b228a00 https://git.kernel.org/stable/c/f6620df12cb6bdcad671d269debbb23573502f9d https://git.kernel.org/stable/c/000099d71648504fb9c7a4616f92c2b70c3e44ec https://git.kernel.org/stable/c/30139c702048f1097342a31302cbd3d478f50c63
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