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d227b45fc1
thread__e_machine_endian() decides whether a thread is live, and so
whether to read /proc/pid/exe rather than fall back to the perf.data
environment, by recovering the session from the machine:
session = container_of(machine->machines, struct perf_session,
machines);
is_live = !session->data;
That only holds when the struct machines is the one embedded in a struct
perf_session. It is not the only one. aslr_tool keeps its own in struct
aslr_tool, and hists_cumulate, hists_filter, hists_link, hists_output
and thread-maps-share each put one on the stack. For those the
container_of subtracts offsetof(struct perf_session, machines) from an
address that was never inside a session, and the following load of
session->data reads outside the object, which is what ASan reports.
Replace the derivation with an explicit link. machines__init() takes the
owning session, or NULL when the machines is standalone, and
thread__e_machine_endian() reads it back through machines__session().
A NULL session is treated as live. The tests use synthetic pids that
have no /proc entry, so the read fails there and the e_machine falls
back to EM_HOST as before, rather than being decided by whatever the
out of bounds read happened to return. perf inject registers its
session with the aslr tool once the session exists, before any event is
processed, so that tool keeps reporting file based threads as not live.
Fixes:
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|---|---|---|
| .. | ||
| arch | ||
| bench | ||
| check-header_ignore_hunks/lib | ||
| dlfilters | ||
| Documentation | ||
| include/perf | ||
| jvmti | ||
| pmu-events | ||
| python | ||
| scripts | ||
| tests | ||
| trace | ||
| ui | ||
| util | ||
| .clang-format | ||
| .gitignore | ||
| bpf_skel.mak | ||
| Build | ||
| builtin-annotate.c | ||
| builtin-bench.c | ||
| builtin-buildid-cache.c | ||
| builtin-buildid-list.c | ||
| builtin-c2c.c | ||
| builtin-check.c | ||
| builtin-config.c | ||
| builtin-daemon.c | ||
| builtin-data.c | ||
| builtin-diff.c | ||
| builtin-evlist.c | ||
| builtin-ftrace.c | ||
| builtin-help.c | ||
| builtin-inject.c | ||
| builtin-kallsyms.c | ||
| builtin-kmem.c | ||
| builtin-kvm.c | ||
| builtin-kwork.c | ||
| builtin-list.c | ||
| builtin-lock.c | ||
| builtin-mem.c | ||
| builtin-probe.c | ||
| builtin-record.c | ||
| builtin-report.c | ||
| builtin-sched.c | ||
| builtin-script.c | ||
| builtin-stat.c | ||
| builtin-timechart.c | ||
| builtin-top.c | ||
| builtin-trace.c | ||
| builtin-version.c | ||
| builtin.h | ||
| check-headers.sh | ||
| CREDITS | ||
| design.txt | ||
| Makefile | ||
| Makefile.config | ||
| Makefile.perf | ||
| MANIFEST | ||
| perf-archive.sh | ||
| perf-completion.sh | ||
| perf-iostat.sh | ||
| perf-read-vdso.c | ||
| perf-sys.h | ||
| perf.c | ||
| perf.h | ||