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Namhyung Kim 1dbd4215c7 perf lock contention: Add a missing NULL check 
[ Upstream commit f3408580ba ]

I got a report for a failure in BPF verifier on a recent kernel with
perf lock contention command.  It checks task->sighand->siglock without
checking if sighand is NULL or not.  Let's add one.

  ; if (&curr->sighand->siglock == (void *)lock)
  265: (79) r1 = *(u64 *)(r0 +2624)     ; frame1: R0_w=trusted_ptr_task_struct(off=0,imm=0)
                                        ;         R1_w=rcu_ptr_or_null_sighand_struct(off=0,imm=0)
  266: (b7) r2 = 0                      ; frame1: R2_w=0
  267: (0f) r1 += r2
  R1 pointer arithmetic on rcu_ptr_or_null_ prohibited, null-check it first
  processed 164 insns (limit 1000000) max_states_per_insn 1 total_states 15 peak_states 15 mark_read 5
  -- END PROG LOAD LOG --
  libbpf: prog 'contention_end': failed to load: -13
  libbpf: failed to load object 'lock_contention_bpf'
  libbpf: failed to load BPF skeleton 'lock_contention_bpf': -13
  Failed to load lock-contention BPF skeleton
  lock contention BPF setup failed
  lock contention did not detect any lock contention

Fixes: 1811e82767 ("perf lock contention: Track and show siglock with address")
Reviewed-by: Ian Rogers <irogers@google.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Song Liu <song@kernel.org>
Cc: bpf@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240409225542.1870999-1-namhyung@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2024-04-27 17:12:54 +02:00
..
Documentation perf list: Add output file option 2024-01-26 10:51:49 -03:00
arch perf tools improvements and fixes for v6.8: 2024-01-19 14:25:23 -08:00
bench libperf cpumap: Replace usage of perf_cpu_map__new(NULL) with perf_cpu_map__new_online_cpus() 2023-12-12 14:55:13 -03:00
dlfilters perf dlfilter: Add a test for object_code() 2023-09-30 00:09:06 -07:00
include/perf perf dlfilter: Add al_cleanup() 2023-08-15 16:41:49 -03:00
jvmti
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pmu-events perf vendor events amd: Fix Zen 4 cache latency events 2024-03-26 18:17:16 -04:00
python
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scripts perf scripts python arm-cs-trace-disasm.py: Do not ignore disam first sample 2023-12-20 14:31:59 -03:00
tests perf test shell daemon: Make signal test less racy 2024-01-26 10:51:49 -03:00
trace tools headers uapi: Sync linux/stat.h with the kernel sources to pick STATX_MNT_ID_UNIQUE 2024-01-26 10:51:48 -03:00
ui perf annotate: Make sure to call symbol__annotate2() in TUI 2024-04-27 17:12:54 +02:00
util perf lock contention: Add a missing NULL check 2024-04-27 17:12:54 +02:00
.gitignore perf build: Shellcheck support for OUTPUT directory 2023-12-05 15:46:43 -03:00
Build
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CREDITS
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MANIFEST tools perf: Add arm64 sysreg files to MANIFEST 2023-11-22 11:17:53 -08:00
Makefile
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Makefile.config perf probe: Convert to check dwarf_getcfi feature 2023-11-10 09:04:21 -03:00
Makefile.perf perf bpf: Clean up the generated/copied vmlinux.h 2024-03-26 18:17:02 -04:00
builtin-annotate.c perf annotate: Add --insn-stat option for debugging 2023-12-23 22:40:17 -03:00
builtin-bench.c perf tools changes for v6.6: 2023-09-09 20:06:17 -07:00
builtin-buildid-cache.c perf buildid-cache: Fix use of uninitialized value 2023-10-12 10:01:56 -07:00
builtin-buildid-list.c
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builtin-c2c.c libperf cpumap: Rename perf_cpu_map__empty() to perf_cpu_map__has_any_cpu_or_is_empty() 2023-12-12 14:55:13 -03:00
builtin-config.c
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builtin-daemon.c
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builtin-data.c
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builtin-diff.c
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builtin-evlist.c
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builtin-ftrace.c libperf cpumap: Replace usage of perf_cpu_map__new(NULL) with perf_cpu_map__new_online_cpus() 2023-12-12 14:55:13 -03:00
builtin-help.c
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builtin-inject.c perf record: Lazy load kernel symbols 2023-11-09 13:49:32 -03:00
builtin-kallsyms.c
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builtin-kmem.c
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builtin-kvm.c
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builtin-kwork.c perf kwork: Fix a build error on 32-bit 2023-11-21 10:02:38 -08:00
builtin-list.c perf list: Add output file option 2024-01-26 10:51:49 -03:00
builtin-lock.c perf lock: Fix a memory leak on an error path 2023-11-27 10:21:27 -03:00
builtin-mem.c
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builtin-probe.c
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builtin-record.c perf record: Check conflict between '--timestamp-filename' option and pipe mode before recording 2024-03-26 18:17:01 -04:00
builtin-report.c perf report: Support data type profiling 2023-12-23 22:39:42 -03:00
builtin-sched.c libperf rc_check: Add RC_CHK_EQUAL 2023-10-25 13:37:22 -07:00
builtin-script.c perf: script: fix missing ',' for fields option 2023-10-17 12:40:51 -07:00
builtin-stat.c perf stat: Combine the -A/--no-aggr and --no-merge options 2023-12-14 18:24:38 -03:00
builtin-timechart.c
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builtin-top.c perf top: Remove needless malloc(0) call that triggers -Walloc-size 2024-01-26 12:06:12 -03:00
builtin-trace.c perf env: Introduce perf_env__arch_strerrno() 2023-12-04 16:42:09 -03:00
builtin-version.c perf version: Add status of bpf skeletons 2023-09-18 16:46:15 -07:00
builtin.h
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check-headers.sh perf tools: Add get_unaligned_leNN() 2023-10-17 12:40:02 -07:00
command-list.txt
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design.txt
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perf-archive.sh perf archive: Add new option '--unpack' to expand tarballs 2023-12-20 13:20:45 -03:00
perf-completion.sh perf shell completion: Support completion of metrics/metricgroups 2023-09-11 10:26:36 -03:00
perf-iostat.sh
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perf-read-vdso.c
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perf-sys.h
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perf.c perf tools: Add --debug-file option to redirect debug output 2023-11-28 14:14:53 -03:00
perf.h
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