4bef6168c1
Running a script that processes PEBS records gives buffer overflows in valgrind. The problem is that the allocation of the register string doesn't include the terminating 0 byte. Fix this. I also replaced the very magic "28" with a more reasonable larger buffer that should fit all registers. There's no need to conserve memory here. ==2106591== Memcheck, a memory error detector ==2106591== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al. ==2106591== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info ==2106591== Command: ../perf script -i tcall.data gcov.py tcall.gcov ==2106591== ==2106591== Invalid write of size 1 ==2106591== at 0x713354: regs_map (trace-event-python.c:748) ==2106591== by 0x7134EB: set_regs_in_dict (trace-event-python.c:784) ==2106591== by 0x713E58: get_perf_sample_dict (trace-event-python.c:940) ==2106591== by 0x716327: python_process_general_event (trace-event-python.c:1499) ==2106591== by 0x7164E1: python_process_event (trace-event-python.c:1531) ==2106591== by 0x44F9AF: process_sample_event (builtin-script.c:2549) ==2106591== by 0x6294DC: evlist__deliver_sample (session.c:1534) ==2106591== by 0x6296D0: machines__deliver_event (session.c:1573) ==2106591== by 0x629C39: perf_session__deliver_event (session.c:1655) ==2106591== by 0x625830: ordered_events__deliver_event (session.c:193) ==2106591== by 0x630B23: do_flush (ordered-events.c:245) ==2106591== by 0x630E7A: __ordered_events__flush (ordered-events.c:324) ==2106591== Address 0x7186fe0 is 0 bytes after a block of size 0 alloc'd ==2106591== at 0x484280F: malloc (vg_replace_malloc.c:442) ==2106591== by 0x7134AD: set_regs_in_dict (trace-event-python.c:780) ==2106591== by 0x713E58: get_perf_sample_dict (trace-event-python.c:940) ==2106591== by 0x716327: python_process_general_event (trace-event-python.c:1499) ==2106591== by 0x7164E1: python_process_event (trace-event-python.c:1531) ==2106591== by 0x44F9AF: process_sample_event (builtin-script.c:2549) ==2106591== by 0x6294DC: evlist__deliver_sample (session.c:1534) ==2106591== by 0x6296D0: machines__deliver_event (session.c:1573) ==2106591== by 0x629C39: perf_session__deliver_event (session.c:1655) ==2106591== by 0x625830: ordered_events__deliver_event (session.c:193) ==2106591== by 0x630B23: do_flush (ordered-events.c:245) ==2106591== by 0x630E7A: __ordered_events__flush (ordered-events.c:324) ==2106591== ==2106591== Invalid read of size 1 ==2106591== at 0x484B6C6: strlen (vg_replace_strmem.c:502) ==2106591== by 0x555D494: PyUnicode_FromString (unicodeobject.c:1899) ==2106591== by 0x7134F7: set_regs_in_dict (trace-event-python.c:786) ==2106591== by 0x713E58: get_perf_sample_dict (trace-event-python.c:940) ==2106591== by 0x716327: python_process_general_event (trace-event-python.c:1499) ==2106591== by 0x7164E1: python_process_event (trace-event-python.c:1531) ==2106591== by 0x44F9AF: process_sample_event (builtin-script.c:2549) ==2106591== by 0x6294DC: evlist__deliver_sample (session.c:1534) ==2106591== by 0x6296D0: machines__deliver_event (session.c:1573) ==2106591== by 0x629C39: perf_session__deliver_event (session.c:1655) ==2106591== by 0x625830: ordered_events__deliver_event (session.c:193) ==2106591== by 0x630B23: do_flush (ordered-events.c:245) ==2106591== Address 0x7186fe0 is 0 bytes after a block of size 0 alloc'd ==2106591== at 0x484280F: malloc (vg_replace_malloc.c:442) ==2106591== by 0x7134AD: set_regs_in_dict (trace-event-python.c:780) ==2106591== by 0x713E58: get_perf_sample_dict (trace-event-python.c:940) ==2106591== by 0x716327: python_process_general_event (trace-event-python.c:1499) ==2106591== by 0x7164E1: python_process_event (trace-event-python.c:1531) ==2106591== by 0x44F9AF: process_sample_event (builtin-script.c:2549) ==2106591== by 0x6294DC: evlist__deliver_sample (session.c:1534) ==2106591== by 0x6296D0: machines__deliver_event (session.c:1573) ==2106591== by 0x629C39: perf_session__deliver_event (session.c:1655) ==2106591== by 0x625830: ordered_events__deliver_event (session.c:193) ==2106591== by 0x630B23: do_flush (ordered-events.c:245) ==2106591== by 0x630E7A: __ordered_events__flush (ordered-events.c:324) ==2106591== ==2106591== Invalid write of size 1 ==2106591== at 0x713354: regs_map (trace-event-python.c:748) ==2106591== by 0x713539: set_regs_in_dict (trace-event-python.c:789) ==2106591== by 0x713E58: get_perf_sample_dict (trace-event-python.c:940) ==2106591== by 0x716327: python_process_general_event (trace-event-python.c:1499) ==2106591== by 0x7164E1: python_process_event (trace-event-python.c:1531) ==2106591== by 0x44F9AF: process_sample_event (builtin-script.c:2549) ==2106591== by 0x6294DC: evlist__deliver_sample (session.c:1534) ==2106591== by 0x6296D0: machines__deliver_event (session.c:1573) ==2106591== by 0x629C39: perf_session__deliver_event (session.c:1655) ==2106591== by 0x625830: ordered_events__deliver_event (session.c:193) ==2106591== by 0x630B23: do_flush (ordered-events.c:245) ==2106591== by 0x630E7A: __ordered_events__flush (ordered-events.c:324) ==2106591== Address 0x7186fe0 is 0 bytes after a block of size 0 alloc'd ==2106591== at 0x484280F: malloc (vg_replace_malloc.c:442) ==2106591== by 0x7134AD: set_regs_in_dict (trace-event-python.c:780) ==2106591== by 0x713E58: get_perf_sample_dict (trace-event-python.c:940) ==2106591== by 0x716327: python_process_general_event (trace-event-python.c:1499) ==2106591== by 0x7164E1: python_process_event (trace-event-python.c:1531) ==2106591== by 0x44F9AF: process_sample_event (builtin-script.c:2549) ==2106591== by 0x6294DC: evlist__deliver_sample (session.c:1534) ==2106591== by 0x6296D0: machines__deliver_event (session.c:1573) ==2106591== by 0x629C39: perf_session__deliver_event (session.c:1655) ==2106591== by 0x625830: ordered_events__deliver_event (session.c:193) ==2106591== by 0x630B23: do_flush (ordered-events.c:245) ==2106591== by 0x630E7A: __ordered_events__flush (ordered-events.c:324) ==2106591== ==2106591== Invalid read of size 1 ==2106591== at 0x484B6C6: strlen (vg_replace_strmem.c:502) ==2106591== by 0x555D494: PyUnicode_FromString (unicodeobject.c:1899) ==2106591== by 0x713545: set_regs_in_dict (trace-event-python.c:791) ==2106591== by 0x713E58: get_perf_sample_dict (trace-event-python.c:940) ==2106591== by 0x716327: python_process_general_event (trace-event-python.c:1499) ==2106591== by 0x7164E1: python_process_event (trace-event-python.c:1531) ==2106591== by 0x44F9AF: process_sample_event (builtin-script.c:2549) ==2106591== by 0x6294DC: evlist__deliver_sample (session.c:1534) ==2106591== by 0x6296D0: machines__deliver_event (session.c:1573) ==2106591== by 0x629C39: perf_session__deliver_event (session.c:1655) ==2106591== by 0x625830: ordered_events__deliver_event (session.c:193) ==2106591== by 0x630B23: do_flush (ordered-events.c:245) ==2106591== Address 0x7186fe0 is 0 bytes after a block of size 0 alloc'd ==2106591== at 0x484280F: malloc (vg_replace_malloc.c:442) ==2106591== by 0x7134AD: set_regs_in_dict (trace-event-python.c:780) ==2106591== by 0x713E58: get_perf_sample_dict (trace-event-python.c:940) ==2106591== by 0x716327: python_process_general_event (trace-event-python.c:1499) ==2106591== by 0x7164E1: python_process_event (trace-event-python.c:1531) ==2106591== by 0x44F9AF: process_sample_event (builtin-script.c:2549) ==2106591== by 0x6294DC: evlist__deliver_sample (session.c:1534) ==2106591== by 0x6296D0: machines__deliver_event (session.c:1573) ==2106591== by 0x629C39: perf_session__deliver_event (session.c:1655) ==2106591== by 0x625830: ordered_events__deliver_event (session.c:193) ==2106591== by 0x630B23: do_flush (ordered-events.c:245) ==2106591== by 0x630E7A: __ordered_events__flush (ordered-events.c:324) ==2106591== 73056 total, 29 ignored Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20240905151058.2127122-2-ak@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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