CVE-2022-49065 (GCVE-0-2022-49065)
Vulnerability from cvelistv5
Published
2025-02-26 01:54
Modified
2026-05-11 18:52
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix the svc_deferred_event trace class Fix a NULL deref crash that occurs when an svc_rqst is deferred while the sunrpc tracing subsystem is enabled. svc_revisit() sets dr->xprt to NULL, so it can't be relied upon in the tracepoint to provide the remote's address. Unfortunately we can't revert the "svc_deferred_class" hunk in commit ece200ddd54b ("sunrpc: Save remote presentation address in svc_xprt for trace events") because there is now a specific check of event format specifiers for unsafe dereferences. The warning that check emits is: event svc_defer_recv has unsafe dereference of argument 1 A "%pISpc" format specifier with a "struct sockaddr *" is indeed flagged by this check. Instead, take the brute-force approach used by the svcrdma_qp_error tracepoint. Convert the dr::addr field into a presentation address in the TP_fast_assign() arm of the trace event, and store that as a string. This fix can be backported to -stable kernels. In the meantime, commit c6ced22997ad ("tracing: Update print fmt check to handle new __get_sockaddr() macro") is now in v5.18, so this wonky fix can be replaced with __sockaddr() and friends properly during the v5.19 merge window.
References
Impacted products
Vendor Product Version
Linux Linux Version: ece200ddd54b9ce840cfee554fb812560c545c7d
Version: ece200ddd54b9ce840cfee554fb812560c545c7d
Version: ece200ddd54b9ce840cfee554fb812560c545c7d
Version: ece200ddd54b9ce840cfee554fb812560c545c7d
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: Fix the svc_deferred_event trace class\n\nFix a NULL deref crash that occurs when an svc_rqst is deferred\nwhile the sunrpc tracing subsystem is enabled. svc_revisit() sets\ndr-\u003exprt to NULL, so it can\u0027t be relied upon in the tracepoint to\nprovide the remote\u0027s address.\n\nUnfortunately we can\u0027t revert the \"svc_deferred_class\" hunk in\ncommit ece200ddd54b (\"sunrpc: Save remote presentation address in\nsvc_xprt for trace events\") because there is now a specific check\nof event format specifiers for unsafe dereferences. The warning\nthat check emits is:\n\n  event svc_defer_recv has unsafe dereference of argument 1\n\nA \"%pISpc\" format specifier with a \"struct sockaddr *\" is indeed\nflagged by this check.\n\nInstead, take the brute-force approach used by the svcrdma_qp_error\ntracepoint. Convert the dr::addr field into a presentation address\nin the TP_fast_assign() arm of the trace event, and store that as\na string. This fix can be backported to -stable kernels.\n\nIn the meantime, commit c6ced22997ad (\"tracing: Update print fmt\ncheck to handle new __get_sockaddr() macro\") is now in v5.18, so\nthis wonky fix can be replaced with __sockaddr() and friends\nproperly during the v5.19 merge window."
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    "dateReserved": "2025-02-26T01:49:39.244Z",
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