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
Configurations
Configuration 1 (hide)
|
History
19 Sep 2024, 20:38
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 4.7 |
21 Aug 2024, 20:48
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | CWE-369 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| First Time |
Linux
Linux linux Kernel |
|
| References | () https://git.kernel.org/stable/c/2820005edae13b140f2d54267d1bd6bb23915f59 - Patch | |
| References | () https://git.kernel.org/stable/c/145faa3d03688cbb7bbaaecbd84c01539852942c - Patch | |
| References | () https://git.kernel.org/stable/c/000099d71648504fb9c7a4616f92c2b70c3e44ec - Patch | |
| References | () https://git.kernel.org/stable/c/253f9ea7e8e53a5176bd80ceb174907b10724c1a - Patch | |
| References | () https://git.kernel.org/stable/c/23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807 - Patch | |
| References | () https://git.kernel.org/stable/c/30139c702048f1097342a31302cbd3d478f50c63 - Patch | |
| References | () https://git.kernel.org/stable/c/cbbe17a324437c0ff99881a3ee453da45b228a00 - Patch | |
| References | () https://git.kernel.org/stable/c/f6620df12cb6bdcad671d269debbb23573502f9d - Patch |
30 Jul 2024, 08:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2024-07-30 08:15
Updated : 2024-09-19 20:38
NVD link : CVE-2024-42102
Mitre link : CVE-2024-42102
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-369
Divide By Zero