CVE-2024-57838: s390/entry: Mark IRQ entries to fix stack depot warnings
In the Linux kernel, the following vulnerability has been resolved:
s390/entry: Mark IRQ entries to fix stack depot warnings
The stack depot filters out everything outside of the top interrupt context as an uninteresting or irrelevant part of the stack traces. This helps with stack trace de-duplication, avoiding an explosion of saved stack traces that share the same IRQ context code path but originate from different randomly interrupted points, eventually exhausting the stack depot.
Filtering uses inirqentrytext() to identify functions within the .irqentry.text and .softirqentry.text sections, which then become the last stack trace entries being saved.
While dosoftirq() is placed into the .softirqentry.text section by common code, populating .irqentry.text is architecture-specific.
Currently, the .irqentry.text section on s390 is empty, which prevents stack depot filtering and de-duplication and could result in warnings like:
Stack depot reached limit capacity WARNING: CPU: 0 PID: 286113 at lib/stackdepot.c:252 depotallocstack+0x39a/0x3c8
with PREEMPT and KASAN enabled.
Fix this by moving the IO/EXT interrupt handlers from .kprobes.text into the .irqentry.text section and updating the kprobes blacklist to include the .irqentry.text section.
This is done only for asynchronous interrupts and explicitly not for program checks, which are synchronous and where the context beyond the program check is important to preserve. Despite machine checks being somewhat in between, they are extremely rare, and preserving context when possible is also of value.
SVCs and Restart Interrupts are not relevant, one being always at the boundary to user space and the other being a one-time thing.
IRQ entries filtering is also optionally used in ftrace function graph, where the same logic applies.
Other sources
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— Launchpad
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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Move the s390 IO/EXT interrupt handlers from .kprobes.text into .irqentry.text, and update the kprobes blacklist to include the .irqentry.text section.
Linux kernel s390 IRQ entry section and kprobes blacklist = Place IO/EXT interrupt handlers in .irqentry.text and include .irqentry.text in the kprobes blacklist
Event History
Frequently Asked Questions
What is the severity of CVE-2024-57838?
CVE-2024-57838 has been classified as a low-severity vulnerability affecting the Linux kernel.
How do I fix CVE-2024-57838?
To fix CVE-2024-57838, update to the latest version of the Linux kernel that includes the patch for this vulnerability.
What systems are affected by CVE-2024-57838?
CVE-2024-57838 affects the Linux kernel across various distributions that utilize a version vulnerable to this issue.
What impact does CVE-2024-57838 have on my system?
The CVE-2024-57838 vulnerability addresses stack depot warnings caused by improper handling of IRQ entries, which can lead to ineffective stack traces.
Is CVE-2024-57838 being actively exploited?
As of now, there is no public information indicating that CVE-2024-57838 is being actively exploited in the wild.