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perf test: Initialize memory in dwarf-unwind

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Avoid a false positive caused by assembly code in arch/x86.

In tests, zero the perf_event to avoid uninitialized memory uses.

Warnings were caught using clang with -fsanitize=memory.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Monnet <quentin@isovalent.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: clang-built-linux@googlegroups.com
Link: http://lore.kernel.org/lkml/20200530082015.39162-4-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2020-05-30 01:20:15 -07:00 committed by Arnaldo Carvalho de Melo
parent 8617e2e34f
commit 0fb0d615f3
2 changed files with 9 additions and 0 deletions
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8
tools/perf/arch/x86/tests/dwarf-unwind.c
View File

@ -55,6 +55,14 @@ int test__arch_unwind_sample(struct perf_sample *sample,
return -1;
}
#ifdef MEMORY_SANITIZER
/*
* Assignments to buf in the assembly function perf_regs_load aren't
* seen by memory sanitizer. Zero the memory to convince memory
* sanitizer the memory is initialized.
*/
memset(buf, 0, sizeof(u64) * PERF_REGS_MAX);
#endif
perf_regs_load(buf);
regs->abi = PERF_SAMPLE_REGS_ABI;
regs->regs = buf;

1
tools/perf/tests/dwarf-unwind.c
View File

@ -37,6 +37,7 @@ static int init_live_machine(struct machine *machine)
union perf_event event;
pid_t pid = getpid();
memset(&event, 0, sizeof(event));
return perf_event__synthesize_mmap_events(NULL, &event, pid, pid,
mmap_handler, machine, true);
}