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bpf: sanitize bpf tracepoint access

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during bpf program loading remember the last byte of ctx access
and at the time of attaching the program to tracepoint check that
the program doesn't access bytes beyond defined in tracepoint fields

This also disallows access to __dynamic_array fields, but can be
relaxed in the future.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov
2016-04-06 18:43:28 -07:00
committed by David S. Miller
parent 9940d67c93
commit 32bbe0078a
5 changed files with 33 additions and 1 deletions
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include/linux/trace_events.h
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@@ -569,6 +569,7 @@ extern int trace_define_field(struct trace_event_call *call, const char *type,
int is_signed, int filter_type);
extern int trace_add_event_call(struct trace_event_call *call);
extern int trace_remove_event_call(struct trace_event_call *call);
extern int trace_event_get_offsets(struct trace_event_call *call);
#define is_signed_type(type) (((type)(-1)) < (type)1)