CVE-2024-57839: Revert "readahead: properly shorten readahead when falling back to do_page_cache_ra()"
Description
In the Linux kernel, the following vulnerability has been resolved:
Revert "readahead: properly shorten readahead when falling back to do_page_cache_ra()"
This reverts commit 7c877586da3178974a8a94577b6045a48377ff25.
Anders and Philippe have reported that recent kernels occasionally hang
when used with NFS in readahead code. The problem has been bisected to
7c877586da3 ("readahead: properly shorten readahead when falling back to
do_page_cache_ra()"). The cause of the problem is that ra->size can be
shrunk by read_pages() call and subsequently we end up calling
do_page_cache_ra() with negative (read huge positive) number of pages.
Let's revert 7c877586da3 for now until we can find a proper way how the
logic in read_pages() and page_cache_ra_order() can coexist. This can
lead to reduced readahead throughput due to readahead window confusion but
that's better than outright hangs.
Classification
CVE ID: CVE-2024-57839
Affected Products
Vendor: Linux
Product: Linux
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 11.47% (scored less or equal to compared to others)
EPSS Date: 2025-02-09 (when was this score calculated)
References
https://git.kernel.org/stable/c/85351e4941a253e4c50fb7048bfc19b60b4ec44bhttps://git.kernel.org/stable/c/a220d6b95b1ae12c7626283d7609f0a1438e6437