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![Peter Enderborg](/assets/img/avatar_default.png)
This patch adds further attributes to the event. These attributes are helpful to understand the context of the message and can be used to filter the events. There are three common items. Source context, target context and tclass. There are also items from the outcome of operation performed. An event is similar to: <...>-1309 [002] .... 6346.691689: selinux_audited: requested=0x4000000 denied=0x4000000 audited=0x4000000 result=-13 scontext=system_u:system_r:cupsd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:bin_t:s0 tclass=file With systems where many denials are occurring, it is useful to apply a filter. The filtering is a set of logic that is inserted with the filter file. Example: echo "tclass==\"file\" " > events/avc/selinux_audited/filter This adds that we only get tclass=file. The trace can also have extra properties. Adding the user stack can be done with echo 1 > options/userstacktrace Now the output will be runcon-1365 [003] .... 6960.955530: selinux_audited: requested=0x4000000 denied=0x4000000 audited=0x4000000 result=-13 scontext=system_u:system_r:cupsd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:bin_t:s0 tclass=file runcon-1365 [003] .... 6960.955560: <user stack trace> => <00007f325b4ce45b> => <00005607093efa57> Signed-off-by: Peter Enderborg <peter.enderborg@sony.com> Reviewed-by: Thiébaud Weksteen <tweek@google.com> Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Authors: Thiébaud Weksteen <tweek@google.com>
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* Peter Enderborg <Peter.Enderborg@sony.com>
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*/
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM avc
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#if !defined(_TRACE_SELINUX_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_SELINUX_H
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#include <linux/tracepoint.h>
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TRACE_EVENT(selinux_audited,
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TP_PROTO(struct selinux_audit_data *sad,
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char *scontext,
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char *tcontext,
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const char *tclass
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),
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TP_ARGS(sad, scontext, tcontext, tclass),
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TP_STRUCT__entry(
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__field(u32, requested)
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__field(u32, denied)
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__field(u32, audited)
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__field(int, result)
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__string(scontext, scontext)
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__string(tcontext, tcontext)
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__string(tclass, tclass)
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),
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TP_fast_assign(
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__entry->requested = sad->requested;
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__entry->denied = sad->denied;
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__entry->audited = sad->audited;
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__entry->result = sad->result;
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__assign_str(tcontext, tcontext);
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__assign_str(scontext, scontext);
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__assign_str(tclass, tclass);
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),
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TP_printk("requested=0x%x denied=0x%x audited=0x%x result=%d scontext=%s tcontext=%s tclass=%s",
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__entry->requested, __entry->denied, __entry->audited, __entry->result,
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__get_str(scontext), __get_str(tcontext), __get_str(tclass)
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)
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);
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#endif
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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