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In cases where we want a stable way to observe/trace cap_capable (e.g. protection from inlining and API updates) add a tracepoint that passes: - The credentials used - The user namespace of the resource being accessed - The user namespace in which the credential provides the capability to access the targeted resource - The capability to check for - The return value of the check Signed-off-by: Jordan Rome <linux@jordanrome.com> Acked-by: Andrii Nakryiko <andrii@kernel.org> Reviewed-by: Paul Moore <paul@paul-moore.com> Reviewed-by: Serge Hallyn <serge@hallyn.com> Link: https://lore.kernel.org/r/20241204155911.1817092-1-linux@jordanrome.com Signed-off-by: Serge Hallyn <sergeh@kernel.org>
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM capability
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#if !defined(_TRACE_CAPABILITY_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_CAPABILITY_H
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#include <linux/cred.h>
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#include <linux/tracepoint.h>
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#include <linux/user_namespace.h>
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/**
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* cap_capable - called after it's determined if a task has a particular
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* effective capability
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*
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* @cred: The credentials used
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* @target_ns: The user namespace of the resource being accessed
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* @capable_ns: The user namespace in which the credential provides the
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* capability to access the targeted resource.
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* This will be NULL if ret is not 0.
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* @cap: The capability to check for
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* @ret: The return value of the check: 0 if it does, -ve if it does not
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*
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* Allows to trace calls to cap_capable in commoncap.c
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*/
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TRACE_EVENT(cap_capable,
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TP_PROTO(const struct cred *cred, struct user_namespace *target_ns,
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const struct user_namespace *capable_ns, int cap, int ret),
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TP_ARGS(cred, target_ns, capable_ns, cap, ret),
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TP_STRUCT__entry(
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__field(const struct cred *, cred)
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__field(struct user_namespace *, target_ns)
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__field(const struct user_namespace *, capable_ns)
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__field(int, cap)
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__field(int, ret)
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),
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TP_fast_assign(
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__entry->cred = cred;
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__entry->target_ns = target_ns;
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__entry->capable_ns = ret == 0 ? capable_ns : NULL;
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__entry->cap = cap;
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__entry->ret = ret;
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),
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TP_printk("cred %p, target_ns %p, capable_ns %p, cap %d, ret %d",
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__entry->cred, __entry->target_ns, __entry->capable_ns, __entry->cap,
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__entry->ret)
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);
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#endif /* _TRACE_CAPABILITY_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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